diff options
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/Makefile | 2 | ||||
| -rw-r--r-- | arch/i386/mm/Makefile | 5 | ||||
| -rw-r--r-- | arch/i386/mm/Makefile_32 | 10 | ||||
| -rw-r--r-- | arch/i386/mm/boot_ioremap_32.c | 100 | ||||
| -rw-r--r-- | arch/i386/mm/discontig_32.c | 431 | ||||
| -rw-r--r-- | arch/i386/mm/extable_32.c | 35 | ||||
| -rw-r--r-- | arch/i386/mm/fault_32.c | 657 | ||||
| -rw-r--r-- | arch/i386/mm/highmem_32.c | 113 | ||||
| -rw-r--r-- | arch/i386/mm/hugetlbpage.c | 391 | ||||
| -rw-r--r-- | arch/i386/mm/init_32.c | 858 | ||||
| -rw-r--r-- | arch/i386/mm/ioremap_32.c | 274 | ||||
| -rw-r--r-- | arch/i386/mm/mmap_32.c | 77 | ||||
| -rw-r--r-- | arch/i386/mm/pageattr_32.c | 278 | ||||
| -rw-r--r-- | arch/i386/mm/pgtable_32.c | 373 |
14 files changed, 1 insertions, 3603 deletions
diff --git a/arch/i386/Makefile b/arch/i386/Makefile index 776d8dcf234..cbdc14fddc3 100644 --- a/arch/i386/Makefile +++ b/arch/i386/Makefile @@ -103,7 +103,7 @@ head-y := arch/i386/kernel/head_32.o arch/i386/kernel/init_task_32.o libs-y += arch/x86/lib/ core-y += arch/i386/kernel/ \ - arch/i386/mm/ \ + arch/x86/mm/ \ $(mcore-y)/ \ arch/x86/crypto/ drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ diff --git a/arch/i386/mm/Makefile b/arch/i386/mm/Makefile deleted file mode 100644 index 4042f8563a1..00000000000 --- a/arch/i386/mm/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -ifeq ($(CONFIG_X86_32),y) -include ${srctree}/arch/i386/mm/Makefile_32 -else -include ${srctree}/arch/x86_64/mm/Makefile_64 -endif diff --git a/arch/i386/mm/Makefile_32 b/arch/i386/mm/Makefile_32 deleted file mode 100644 index 362b4ad082d..00000000000 --- a/arch/i386/mm/Makefile_32 +++ /dev/null @@ -1,10 +0,0 @@ -# -# Makefile for the linux i386-specific parts of the memory manager. -# - -obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap_32.o - -obj-$(CONFIG_NUMA) += discontig_32.o -obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o -obj-$(CONFIG_HIGHMEM) += highmem_32.o -obj-$(CONFIG_BOOT_IOREMAP) += boot_ioremap_32.o diff --git a/arch/i386/mm/boot_ioremap_32.c b/arch/i386/mm/boot_ioremap_32.c deleted file mode 100644 index 4de95a17a7d..00000000000 --- a/arch/i386/mm/boot_ioremap_32.c +++ /dev/null @@ -1,100 +0,0 @@ -/* - * arch/i386/mm/boot_ioremap.c - * - * Re-map functions for early boot-time before paging_init() when the - * boot-time pagetables are still in use - * - * Written by Dave Hansen <haveblue@us.ibm.com> - */ - - -/* - * We need to use the 2-level pagetable functions, but CONFIG_X86_PAE - * keeps that from happenning. If anyone has a better way, I'm listening. - * - * boot_pte_t is defined only if this all works correctly - */ - -#undef CONFIG_X86_PAE -#undef CONFIG_PARAVIRT -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/tlbflush.h> -#include <linux/init.h> -#include <linux/stddef.h> - -/* - * I'm cheating here. It is known that the two boot PTE pages are - * allocated next to each other. I'm pretending that they're just - * one big array. - */ - -#define BOOT_PTE_PTRS (PTRS_PER_PTE*2) - -static unsigned long boot_pte_index(unsigned long vaddr) -{ - return __pa(vaddr) >> PAGE_SHIFT; -} - -static inline boot_pte_t* boot_vaddr_to_pte(void *address) -{ - boot_pte_t* boot_pg = (boot_pte_t*)pg0; - return &boot_pg[boot_pte_index((unsigned long)address)]; -} - -/* - * This is only for a caller who is clever enough to page-align - * phys_addr and virtual_source, and who also has a preference - * about which virtual address from which to steal ptes - */ -static void __boot_ioremap(unsigned long phys_addr, unsigned long nrpages, - void* virtual_source) -{ - boot_pte_t* pte; - int i; - char *vaddr = virtual_source; - - pte = boot_vaddr_to_pte(virtual_source); - for (i=0; i < nrpages; i++, phys_addr += PAGE_SIZE, pte++) { - set_pte(pte, pfn_pte(phys_addr>>PAGE_SHIFT, PAGE_KERNEL)); - __flush_tlb_one(&vaddr[i*PAGE_SIZE]); - } -} - -/* the virtual space we're going to remap comes from this array */ -#define BOOT_IOREMAP_PAGES 4 -#define BOOT_IOREMAP_SIZE (BOOT_IOREMAP_PAGES*PAGE_SIZE) -static __initdata char boot_ioremap_space[BOOT_IOREMAP_SIZE] - __attribute__ ((aligned (PAGE_SIZE))); - -/* - * This only applies to things which need to ioremap before paging_init() - * bt_ioremap() and plain ioremap() are both useless at this point. - * - * When used, we're still using the boot-time pagetables, which only - * have 2 PTE pages mapping the first 8MB - * - * There is no unmap. The boot-time PTE pages aren't used after boot. - * If you really want the space back, just remap it yourself. - * boot_ioremap(&ioremap_space-PAGE_OFFSET, BOOT_IOREMAP_SIZE) - */ -__init void* boot_ioremap(unsigned long phys_addr, unsigned long size) -{ - unsigned long last_addr, offset; - unsigned int nrpages; - - last_addr = phys_addr + size - 1; - - /* page align the requested address */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr) - phys_addr; - - nrpages = size >> PAGE_SHIFT; - if (nrpages > BOOT_IOREMAP_PAGES) - return NULL; - - __boot_ioremap(phys_addr, nrpages, boot_ioremap_space); - - return &boot_ioremap_space[offset]; -} diff --git a/arch/i386/mm/discontig_32.c b/arch/i386/mm/discontig_32.c deleted file mode 100644 index 860e912a3fb..00000000000 --- a/arch/i386/mm/discontig_32.c +++ /dev/null @@ -1,431 +0,0 @@ -/* - * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation - * August 2002: added remote node KVA remap - Martin J. Bligh - * - * Copyright (C) 2002, IBM Corp. - * - * All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for more - * details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/mm.h> -#include <linux/bootmem.h> -#include <linux/mmzone.h> -#include <linux/highmem.h> -#include <linux/initrd.h> -#include <linux/nodemask.h> -#include <linux/module.h> -#include <linux/kexec.h> -#include <linux/pfn.h> -#include <linux/swap.h> - -#include <asm/e820.h> -#include <asm/setup.h> -#include <asm/mmzone.h> -#include <bios_ebda.h> - -struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; -EXPORT_SYMBOL(node_data); -bootmem_data_t node0_bdata; - -/* - * numa interface - we expect the numa architecture specific code to have - * populated the following initialisation. - * - * 1) node_online_map - the map of all nodes configured (online) in the system - * 2) node_start_pfn - the starting page frame number for a node - * 3) node_end_pfn - the ending page fram number for a node - */ -unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly; -unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly; - - -#ifdef CONFIG_DISCONTIGMEM -/* - * 4) physnode_map - the mapping between a pfn and owning node - * physnode_map keeps track of the physical memory layout of a generic - * numa node on a 256Mb break (each element of the array will - * represent 256Mb of memory and will be marked by the node id. so, - * if the first gig is on node 0, and the second gig is on node 1 - * physnode_map will contain: - * - * physnode_map[0-3] = 0; - * physnode_map[4-7] = 1; - * physnode_map[8- ] = -1; - */ -s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1}; -EXPORT_SYMBOL(physnode_map); - -void memory_present(int nid, unsigned long start, unsigned long end) -{ - unsigned long pfn; - - printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n", - nid, start, end); - printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid); - printk(KERN_DEBUG " "); - for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) { - physnode_map[pfn / PAGES_PER_ELEMENT] = nid; - printk("%ld ", pfn); - } - printk("\n"); -} - -unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn, - unsigned long end_pfn) -{ - unsigned long nr_pages = end_pfn - start_pfn; - - if (!nr_pages) - return 0; - - return (nr_pages + 1) * sizeof(struct page); -} -#endif - -extern unsigned long find_max_low_pfn(void); -extern void add_one_highpage_init(struct page *, int, int); -extern unsigned long highend_pfn, highstart_pfn; - -#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) - -unsigned long node_remap_start_pfn[MAX_NUMNODES]; -unsigned long node_remap_size[MAX_NUMNODES]; -unsigned long node_remap_offset[MAX_NUMNODES]; -void *node_remap_start_vaddr[MAX_NUMNODES]; -void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); - -void *node_remap_end_vaddr[MAX_NUMNODES]; -void *node_remap_alloc_vaddr[MAX_NUMNODES]; -static unsigned long kva_start_pfn; -static unsigned long kva_pages; -/* - * FLAT - support for basic PC memory model with discontig enabled, essentially - * a single node with all available processors in it with a flat - * memory map. - */ -int __init get_memcfg_numa_flat(void) -{ - printk("NUMA - single node, flat memory mode\n"); - - /* Run the memory configuration and find the top of memory. */ - find_max_pfn(); - node_start_pfn[0] = 0; - node_end_pfn[0] = max_pfn; - memory_present(0, 0, max_pfn); - - /* Indicate there is one node available. */ - nodes_clear(node_online_map); - node_set_online(0); - return 1; -} - -/* - * Find the highest page frame number we have available for the node - */ -static void __init find_max_pfn_node(int nid) -{ - if (node_end_pfn[nid] > max_pfn) - node_end_pfn[nid] = max_pfn; - /* - * if a user has given mem=XXXX, then we need to make sure - * that the node _starts_ before that, too, not just ends - */ - if (node_start_pfn[nid] > max_pfn) - node_start_pfn[nid] = max_pfn; - BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]); -} - -/* - * Allocate memory for the pg_data_t for this node via a crude pre-bootmem - * method. For node zero take this from the bottom of memory, for - * subsequent nodes place them at node_remap_start_vaddr which contains - * node local data in physically node local memory. See setup_memory() - * for details. - */ -static void __init allocate_pgdat(int nid) -{ - if (nid && node_has_online_mem(nid)) - NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; - else { - NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn)); - min_low_pfn += PFN_UP(sizeof(pg_data_t)); - } -} - -void *alloc_remap(int nid, unsigned long size) -{ - void *allocation = node_remap_alloc_vaddr[nid]; - - size = ALIGN(size, L1_CACHE_BYTES); - - if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid]) - return 0; - - node_remap_alloc_vaddr[nid] += size; - memset(allocation, 0, size); - - return allocation; -} - -void __init remap_numa_kva(void) -{ - void *vaddr; - unsigned long pfn; - int node; - - for_each_online_node(node) { - for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { - vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); - set_pmd_pfn((ulong) vaddr, - node_remap_start_pfn[node] + pfn, - PAGE_KERNEL_LARGE); - } - } -} - -static unsigned long calculate_numa_remap_pages(void) -{ - int nid; - unsigned long size, reserve_pages = 0; - unsigned long pfn; - - for_each_online_node(nid) { - unsigned old_end_pfn = node_end_pfn[nid]; - - /* - * The acpi/srat node info can show hot-add memroy zones - * where memory could be added but not currently present. - */ - if (node_start_pfn[nid] > max_pfn) - continue; - if (node_end_pfn[nid] > max_pfn) - node_end_pfn[nid] = max_pfn; - - /* ensure the remap includes space for the pgdat. */ - size = node_remap_size[nid] + sizeof(pg_data_t); - - /* convert size to large (pmd size) pages, rounding up */ - size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES; - /* now the roundup is correct, convert to PAGE_SIZE pages */ - size = size * PTRS_PER_PTE; - - /* - * Validate the region we are allocating only contains valid - * pages. - */ - for (pfn = node_end_pfn[nid] - size; - pfn < node_end_pfn[nid]; pfn++) - if (!page_is_ram(pfn)) - break; - - if (pfn != node_end_pfn[nid]) - size = 0; - - printk("Reserving %ld pages of KVA for lmem_map of node %d\n", - size, nid); - node_remap_size[nid] = size; - node_remap_offset[nid] = reserve_pages; - reserve_pages += size; - printk("Shrinking node %d from %ld pages to %ld pages\n", - nid, node_end_pfn[nid], node_end_pfn[nid] - size); - - if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) { - /* - * Align node_end_pfn[] and node_remap_start_pfn[] to - * pmd boundary. remap_numa_kva will barf otherwise. - */ - printk("Shrinking node %d further by %ld pages for proper alignment\n", - nid, node_end_pfn[nid] & (PTRS_PER_PTE-1)); - size += node_end_pfn[nid] & (PTRS_PER_PTE-1); - } - - node_end_pfn[nid] -= size; - node_remap_start_pfn[nid] = node_end_pfn[nid]; - shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]); - } - printk("Reserving total of %ld pages for numa KVA remap\n", - reserve_pages); - return reserve_pages; -} - -extern void setup_bootmem_allocator(void); -unsigned long __init setup_memory(void) -{ - int nid; - unsigned long system_start_pfn, system_max_low_pfn; - - /* - * When mapping a NUMA machine we allocate the node_mem_map arrays - * from node local memory. They are then mapped directly into KVA - * between zone normal and vmalloc space. Calculate the size of - * this space and use it to adjust the boundry between ZONE_NORMAL - * and ZONE_HIGHMEM. - */ - find_max_pfn(); - get_memcfg_numa(); - - kva_pages = calculate_numa_remap_pages(); - - /* partially used pages are not usable - thus round upwards */ - system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end); - - kva_start_pfn = find_max_low_pfn() - kva_pages; - -#ifdef CONFIG_BLK_DEV_INITRD - /* Numa kva area is below the initrd */ - if (LOADER_TYPE && INITRD_START) - kva_start_pfn = PFN_DOWN(INITRD_START) - kva_pages; -#endif - kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1); - - system_max_low_pfn = max_low_pfn = find_max_low_pfn(); - printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n", - kva_start_pfn, max_low_pfn); - printk("max_pfn = %ld\n", max_pfn); -#ifdef CONFIG_HIGHMEM - highstart_pfn = highend_pfn = max_pfn; - if (max_pfn > system_max_low_pfn) - highstart_pfn = system_max_low_pfn; - printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", - pages_to_mb(highend_pfn - highstart_pfn)); - num_physpages = highend_pfn; - high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; -#else - num_physpages = system_max_low_pfn; - high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1; -#endif - printk(KERN_NOTICE "%ldMB LOWMEM available.\n", - pages_to_mb(system_max_low_pfn)); - printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n", - min_low_pfn, max_low_pfn, highstart_pfn); - - printk("Low memory ends at vaddr %08lx\n", - (ulong) pfn_to_kaddr(max_low_pfn)); - for_each_online_node(nid) { - node_remap_start_vaddr[nid] = pfn_to_kaddr( - kva_start_pfn + node_remap_offset[nid]); - /* Init the node remap allocator */ - node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] + - (node_remap_size[nid] * PAGE_SIZE); - node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] + - ALIGN(sizeof(pg_data_t), PAGE_SIZE); - - allocate_pgdat(nid); - printk ("node %d will remap to vaddr %08lx - %08lx\n", nid, - (ulong) node_remap_start_vaddr[nid], - (ulong) pfn_to_kaddr(highstart_pfn - + node_remap_offset[nid] + node_remap_size[nid])); - } - printk("High memory starts at vaddr %08lx\n", - (ulong) pfn_to_kaddr(highstart_pfn)); - for_each_online_node(nid) - find_max_pfn_node(nid); - - memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); - NODE_DATA(0)->bdata = &node0_bdata; - setup_bootmem_allocator(); - return max_low_pfn; -} - -void __init numa_kva_reserve(void) -{ - reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages)); -} - -void __init zone_sizes_init(void) -{ - int nid; - unsigned long max_zone_pfns[MAX_NR_ZONES]; - memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); - max_zone_pfns[ZONE_DMA] = - virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; - max_zone_pfns[ZONE_NORMAL] = max_low_pfn; -#ifdef CONFIG_HIGHMEM - max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; -#endif - - /* If SRAT has not registered memory, register it now */ - if (find_max_pfn_with_active_regions() == 0) { - for_each_online_node(nid) { - if (node_has_online_mem(nid)) - add_active_range(nid, node_start_pfn[nid], - node_end_pfn[nid]); - } - } - - free_area_init_nodes(max_zone_pfns); - return; -} - -void __init set_highmem_pages_init(int bad_ppro) -{ -#ifdef CONFIG_HIGHMEM - struct zone *zone; - struct page *page; - - for_each_zone(zone) { - unsigned long node_pfn, zone_start_pfn, zone_end_pfn; - - if (!is_highmem(zone)) - continue; - - zone_start_pfn = zone->zone_start_pfn; - zone_end_pfn = zone_start_pfn + zone->spanned_pages; - - printk("Initializing %s for node %d (%08lx:%08lx)\n", - zone->name, zone_to_nid(zone), - zone_start_pfn, zone_end_pfn); - - for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) { - if (!pfn_valid(node_pfn)) - continue; - page = pfn_to_page(node_pfn); - add_one_highpage_init(page, node_pfn, bad_ppro); - } - } - totalram_pages += totalhigh_pages; -#endif -} - -#ifdef CONFIG_MEMORY_HOTPLUG -int paddr_to_nid(u64 addr) -{ - int nid; - unsigned long pfn = PFN_DOWN(addr); - - for_each_node(nid) - if (node_start_pfn[nid] <= pfn && - pfn < node_end_pfn[nid]) - return nid; - - return -1; -} - -/* - * This function is used to ask node id BEFORE memmap and mem_section's - * initialization (pfn_to_nid() can't be used yet). - * If _PXM is not defined on ACPI's DSDT, node id must be found by this. - */ -int memory_add_physaddr_to_nid(u64 addr) -{ - int nid = paddr_to_nid(addr); - return (nid >= 0) ? nid : 0; -} - -EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); -#endif diff --git a/arch/i386/mm/extable_32.c b/arch/i386/mm/extable_32.c deleted file mode 100644 index 0ce4f22a263..00000000000 --- a/arch/i386/mm/extable_32.c +++ /dev/null @@ -1,35 +0,0 @@ -/* - * linux/arch/i386/mm/extable.c - */ - -#include <linux/module.h> -#include <linux/spinlock.h> -#include <asm/uaccess.h> - -int fixup_exception(struct pt_regs *regs) -{ - const struct exception_table_entry *fixup; - -#ifdef CONFIG_PNPBIOS - if (unlikely(SEGMENT_IS_PNP_CODE(regs->xcs))) - { - extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp; - extern u32 pnp_bios_is_utter_crap; - pnp_bios_is_utter_crap = 1; - printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n"); - __asm__ volatile( - "movl %0, %%esp\n\t" - "jmp *%1\n\t" - : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip)); - panic("do_trap: can't hit this"); - } -#endif - - fixup = search_exception_tables(regs->eip); - if (fixup) { - regs->eip = fixup->fixup; - return 1; - } - - return 0; -} diff --git a/arch/i386/mm/fault_32.c b/arch/i386/mm/fault_32.c deleted file mode 100644 index fcb38e7f354..00000000000 --- a/arch/i386/mm/fault_32.c +++ /dev/null @@ -1,657 +0,0 @@ -/* - * linux/arch/i386/mm/fault.c - * - * Copyright (C) 1995 Linus Torvalds - */ - -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/tty.h> -#include <linux/vt_kern.h> /* For unblank_screen() */ -#include <linux/highmem.h> -#include <linux/bootmem.h> /* for max_low_pfn */ -#include <linux/vmalloc.h> -#include <linux/module.h> -#include <linux/kprobes.h> -#include <linux/uaccess.h> -#include <linux/kdebug.h> - -#include <asm/system.h> -#include <asm/desc.h> -#include <asm/segment.h> - -extern void die(const char *,struct pt_regs *,long); - -static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain); - -int register_page_fault_notifier(struct notifier_block *nb) -{ - vmalloc_sync_all(); - return atomic_notifier_chain_register(¬ify_page_fault_chain, nb); -} -EXPORT_SYMBOL_GPL(register_page_fault_notifier); - -int unregister_page_fault_notifier(struct notifier_block *nb) -{ - return atomic_notifier_chain_unregister(¬ify_page_fault_chain, nb); -} -EXPORT_SYMBOL_GPL(unregister_page_fault_notifier); - -static inline int notify_page_fault(struct pt_regs *regs, long err) -{ - struct die_args args = { - .regs = regs, - .str = "page fault", - .err = err, - .trapnr = 14, - .signr = SIGSEGV - }; - return atomic_notifier_call_chain(¬ify_page_fault_chain, - DIE_PAGE_FAULT, &args); -} - -/* - * Return EIP plus the CS segment base. The segment limit is also - * adjusted, clamped to the kernel/user address space (whichever is - * appropriate), and returned in *eip_limit. - * - * The segment is checked, because it might have been changed by another - * task between the original faulting instruction and here. - * - * If CS is no longer a valid code segment, or if EIP is beyond the - * limit, or if it is a kernel address when CS is not a kernel segment, - * then the returned value will be greater than *eip_limit. - * - * This is slow, but is very rarely executed. - */ -static inline unsigned long get_segment_eip(struct pt_regs *regs, - unsigned long *eip_limit) -{ - unsigned long eip = regs->eip; - unsigned seg = regs->xcs & 0xffff; - u32 seg_ar, seg_limit, base, *desc; - - /* Unlikely, but must come before segment checks. */ - if (unlikely(regs->eflags & VM_MASK)) { - base = seg << 4; - *eip_limit = base + 0xffff; - return base + (eip & 0xffff); - } - - /* The standard kernel/user address space limit. */ - *eip_limit = user_mode(regs) ? USER_DS.seg : KERNEL_DS.seg; - - /* By far the most common cases. */ - if (likely(SEGMENT_IS_FLAT_CODE(seg))) - return eip; - - /* Check the segment exists, is within the current LDT/GDT size, - that kernel/user (ring 0..3) has the appropriate privilege, - that it's a code segment, and get the limit. */ - __asm__ ("larl %3,%0; lsll %3,%1" - : "=&r" (seg_ar), "=r" (seg_limit) : "0" (0), "rm" (seg)); - if ((~seg_ar & 0x9800) || eip > seg_limit) { - *eip_limit = 0; - return 1; /* So that returned eip > *eip_limit. */ - } - - /* Get the GDT/LDT descriptor base. - When you look for races in this code remember that - LDT and other horrors are only used in user space. */ - if (seg & (1<<2)) { - /* Must lock the LDT while reading it. */ - down(¤t->mm->context.sem); - desc = current->mm->context.ldt; - desc = (void *)desc + (seg & ~7); - } else { - /* Must disable preemption while reading the GDT. */ - desc = (u32 *)get_cpu_gdt_table(get_cpu()); - desc = (void *)desc + (seg & ~7); - } - - /* Decode the code segment base from the descriptor */ - base = get_desc_base((unsigned long *)desc); - - if (seg & (1<<2)) { - up(¤t->mm->context.sem); - } else - put_cpu(); - - /* Adjust EIP and segment limit, and clamp at the kernel limit. - It's legitimate for segments to wrap at 0xffffffff. */ - seg_limit += base; - if (seg_limit < *eip_limit && seg_limit >= base) - *eip_limit = seg_limit; - return eip + base; -} - -/* - * Sometimes AMD Athlon/Opteron CPUs report invalid exceptions on prefetch. - * Check that here and ignore it. - */ -static int __is_prefetch(struct pt_regs *regs, unsigned long addr) -{ - unsigned long limit; - unsigned char *instr = (unsigned char *)get_segment_eip (regs, &limit); - int scan_more = 1; - int prefetch = 0; - int i; - - for (i = 0; scan_more && i < 15; i++) { - unsigned char opcode; - unsigned char instr_hi; - unsigned char instr_lo; - - if (instr > (unsigned char *)limit) - break; - if (probe_kernel_address(instr, opcode)) - break; - - instr_hi = opcode & 0xf0; - instr_lo = opcode & 0x0f; - instr++; - - switch (instr_hi) { - case 0x20: - case 0x30: - /* Values 0x26,0x2E,0x36,0x3E are valid x86 prefixes. */ - scan_more = ((instr_lo & 7) == 0x6); - break; - - case 0x60: - /* 0x64 thru 0x67 are valid prefixes in all modes. */ - scan_more = (instr_lo & 0xC) == 0x4; - break; - case 0xF0: - /* 0xF0, 0xF2, and 0xF3 are valid prefixes */ - scan_more = !instr_lo || (instr_lo>>1) == 1; - break; - case 0x00: - /* Prefetch instruction is 0x0F0D or 0x0F18 */ - scan_more = 0; - if (instr > (unsigned char *)limit) - break; - if (probe_kernel_address(instr, opcode)) - break; - prefetch = (instr_lo == 0xF) && - (opcode == 0x0D || opcode == 0x18); - break; - default: - scan_more = 0; - break; - } - } - return prefetch; -} - -static inline int is_prefetch(struct pt_regs *regs, unsigned long addr, - unsigned long error_code) -{ - if (unlikely(boot_cpu_data.x86_vendor == X86_VENDOR_AMD && - boot_cpu_data.x86 >= 6)) { - /* Catch an obscure case of prefetch inside an NX page. */ - if (nx_enabled && (error_code & 16)) - return 0; - return __is_prefetch(regs, addr); - } - return 0; -} - -static noinline void force_sig_info_fault(int si_signo, int si_code, - unsigned long address, struct task_struct *tsk) -{ - siginfo_t info; - - info.si_signo = si_signo; - info.si_errno = 0; - info.si_code = si_code; - info.si_addr = (void __user *)address; - force_sig_info(si_signo, &info, tsk); -} - -fastcall void do_invalid_op(struct pt_regs *, unsigned long); - -static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address) -{ - unsigned index = pgd_index(address); - pgd_t *pgd_k; - pud_t *pud, *pud_k; - pmd_t *pmd, *pmd_k; - - pgd += index; - pgd_k = init_mm.pgd + index; - - if (!pgd_present(*pgd_k)) - return NULL; - - /* - * set_pgd(pgd, *pgd_k); here would be useless on PAE - * and redundant with the set_pmd() on non-PAE. As would - * set_pud. - */ - - pud = pud_offset(pgd, address); - pud_k = pud_offset(pgd_k, address); - if (!pud_present(*pud_k)) - return NULL; - - pmd = pmd_offset(pud, address); - pmd_k = pmd_offset(pud_k, address); - if (!pmd_present(*pmd_k)) - return NULL; - if (!pmd_present(*pmd)) { - set_pmd(pmd, *pmd_k); - arch_flush_lazy_mmu_mode(); - } else - BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k)); - return pmd_k; -} - -/* - * Handle a fault on the vmalloc or module mapping area - * - * This assumes no large pages in there. - */ -static inline int vmalloc_fault(unsigned long address) -{ - unsigned long pgd_paddr; - pmd_t *pmd_k; - pte_t *pte_k; - /* - * Synchronize this task's top level page-table - * with the 'reference' page table. - * - * Do _not_ use "current" here. We might be inside - * an interrupt in the middle of a task switch.. - */ - pgd_paddr = read_cr3(); - pmd_k = vmalloc_sync_one(__va(pgd_paddr), address); - if (!pmd_k) - return -1; - pte_k = pte_offset_kernel(pmd_k, address); - if (!pte_present(*pte_k)) - return -1; - return 0; -} - -int show_unhandled_signals = 1; - -/* - * This routine handles page faults. It determines the address, - * and the problem, and then passes it off to one of the appropriate - * routines. - * - * error_code: - * bit 0 == 0 means no page found, 1 means protection fault - * bit 1 == 0 means read, 1 means write - * bit 2 == 0 means kernel, 1 means user-mode - * bit 3 == 1 means use of reserved bit detected - * bit 4 == 1 means fault was an instruction fetch - */ -fastcall void __kprobes do_page_fault(struct pt_regs *regs, - unsigned long error_code) -{ - struct task_struct *tsk; - struct mm_struct *mm; - struct vm_area_struct * vma; - unsigned long address; - int write, si_code; - int fault; - - /* get the address */ - address = read_cr2(); - - tsk = current; - - si_code = SEGV_MAPERR; - - /* - * We fault-in kernel-space virtual memory on-demand. The - * 'reference' page table is init_mm.pgd. - * - * NOTE! We MUST NOT take any locks for this case. We may - * be in an interrupt or a critical region, and should - * only copy the information from the master page table, - * nothing more. - * - * This verifies that the fault happens in kernel space - * (error_code & 4) == 0, and that the fault was not a - * protection error (error_code & 9) == 0. - */ - if (unlikely(address >= TASK_SIZE)) { - if (!(error_code & 0x0000000d) && vmalloc_fault(address) >= 0) - return; - if (notify_page_fault(regs, error_code) == NOTIFY_STOP) - return; - /* - * Don't take the mm semaphore here. If we fixup a prefetch - * fault we could otherwise deadlock. - */ - goto bad_area_nosemaphore; - } - - if (notify_page_fault(regs, error_code) == NOTIFY_STOP) - return; - - /* It's safe to allow irq's after cr2 has been saved and the vmalloc - fault has been handled. */ - if (regs->eflags & (X86_EFLAGS_IF|VM_MASK)) - local_irq_enable(); - - mm = tsk->mm; - - /* - * If we're in an interrupt, have no user context or are running in an - * atomic region then we must not take the fault.. - */ - if (in_atomic() || !mm) - goto bad_area_nosemaphore; - - /* When running in the kernel we expect faults to occur only to - * addresses in user space. All other faults represent errors in the - * kernel and should generate an OOPS. Unfortunatly, in the case of an - * erroneous fault occurring in a code path which already holds mmap_sem - * we will deadlock attempting to validate the fault against the - * address space. Luckily the kernel only validly references user - * space from well defined areas of code, which are listed in the - * exceptions table. - * - * As the vast majority of faults will be valid we will only perform - * the source reference check when there is a possibilty of a deadlock. - * Attempt to lock the address space, if we cannot we then validate the - * source. If this is invalid we can skip the address space check, - * thus avoiding the deadlock. - */ - if (!down_read_trylock(&mm->mmap_sem)) { - if ((error_code & 4) == 0 && - !search_exception_tables(regs->eip)) - goto bad_area_nosemaphore; - down_read(&mm->mmap_sem); - } - - vma = find_vma(mm, address); - if (!vma) - goto bad_area; - if (vma->vm_start <= address) - goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - if (error_code & 4) { - /* - * Accessing the stack below %esp is always a bug. - * The large cushion allows instructions like enter - * and pusha to work. ("enter $65535,$31" pushes - * 32 pointers and then decrements %esp by 65535.) - */ - if (address + 65536 + 32 * sizeof(unsigned long) < regs->esp) - goto bad_area; - } - if (expand_stack(vma, address)) - goto bad_area; -/* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: - si_code = SEGV_ACCERR; - write = 0; - switch (error_code & 3) { - default: /* 3: write, present */ - /* fall through */ - case 2: /* write, not present */ - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - write++; - break; - case 1: /* read, present */ - goto bad_area; - case 0: /* read, not present */ - if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))) - goto bad_area; - } - - survive: - /* - * If for any reason at all we couldn't handle the fault, - * make sure we exit gracefully rather than endlessly redo - * the fault. - */ - fault = handle_mm_fault(mm, vma, address, write); - if (unlikely(fault & VM_FAULT_ERROR)) { - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGBUS) - goto do_sigbus; - BUG(); - } - if (fault & VM_FAULT_MAJOR) - tsk->maj_flt++; - else - tsk->min_flt++; - - /* - * Did it hit the DOS screen memory VA from vm86 mode? - */ - if (regs->eflags & VM_MASK) { - unsigned long bit = (address - 0xA0000) >> PAGE_SHIFT; - if (bit < 32) - tsk->thread.screen_bitmap |= 1 << bit; - } - up_read(&mm->mmap_sem); - return; - -/* - * Something tried to access memory that isn't in our memory map.. - * Fix it, but check if it's kernel or user first.. - */ -bad_area: - up_read(&mm->mmap_sem); - -bad_area_nosemaphore: - /* User mode accesses just cause a SIGSEGV */ - if (error_code & 4) { - /* - * It's possible to have interrupts off here. - */ - local_irq_enable(); - - /* - * Valid to do another page fault here because this one came - * from user space. - */ - if (is_prefetch(regs, address, error_code)) - return; - - if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && - printk_ratelimit()) { - printk("%s%s[%d]: segfault at %08lx eip %08lx " - "esp %08lx error %lx\n", - tsk->pid > 1 ? KERN_INFO : KERN_EMERG, - tsk->comm, tsk->pid, address, regs->eip, - regs->esp, error_code); - } - tsk->thread.cr2 = address; - /* Kernel addresses are always protection faults */ - tsk->thread.error_code = error_code | (address >= TASK_SIZE); - tsk->thread.trap_no = 14; - force_sig_info_fault(SIGSEGV, si_code, address, tsk); - return; - } - -#ifdef CONFIG_X86_F00F_BUG - /* - * Pentium F0 0F C7 C8 bug workaround. - */ - if (boot_cpu_data.f00f_bug) { - unsigned long nr; - - nr = (address - idt_descr.address) >> 3; - - if (nr == 6) { - do_invalid_op(regs, 0); - return; - } - } -#endif - -no_context: - /* Are we prepared to handle this kernel fault? */ - if (fixup_exception(regs)) - return; - - /* - * Valid to do another page fault here, because if this fault - * had been triggered by is_prefetch fixup_exception would have - * handled it. - */ - if (is_prefetch(regs, address, error_code)) - return; - -/* - * Oops. The kernel tried to access some bad page. We'll have to - * terminate things with extreme prejudice. - */ - - bust_spinlocks(1); - - if (oops_may_print()) { - __typeof__(pte_val(__pte(0))) page; - -#ifdef CONFIG_X86_PAE - if (error_code & 16) { - pte_t *pte = lookup_address(address); - - if (pte && pte_present(*pte) && !pte_exec_kernel(*pte)) - printk(KERN_CRIT "kernel tried to execute " - "NX-protected page - exploit attempt? " - "(uid: %d)\n", current->uid); - } -#endif - if (address < PAGE_SIZE) - printk(KERN_ALERT "BUG: unable to handle kernel NULL " - "pointer dereference"); - else - printk(KERN_ALERT "BUG: unable to handle kernel paging" - " request"); - printk(" at virtual address %08lx\n",address); - printk(KERN_ALERT " printing eip:\n"); - printk("%08lx\n", regs->eip); - - page = read_cr3(); - page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT]; -#ifdef CONFIG_X86_PAE - printk(KERN_ALERT "*pdpt = %016Lx\n", page); - if ((page >> PAGE_SHIFT) < max_low_pfn - && page & _PAGE_PRESENT) { - page &= PAGE_MASK; - page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT) - & (PTRS_PER_PMD - 1)]; - printk(KERN_ALERT "*pde = %016Lx\n", page); - page &= ~_PAGE_NX; - } -#else - printk(KERN_ALERT "*pde = %08lx\n", page); -#endif - - /* - * We must not directly access the pte in the highpte - * case if the page table is located in highmem. - * And let's rather not kmap-atomic the pte, just in case - * it's allocated already. - */ - if ((page >> PAGE_SHIFT) < max_low_pfn - && (page & _PAGE_PRESENT)) { - page &= PAGE_MASK; - page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT) - & (PTRS_PER_PTE - 1)]; - printk(KERN_ALERT "*pte = %0*Lx\n", sizeof(page)*2, (u64)page); - } - } - - tsk->thread.cr2 = address; - tsk->thread.trap_no = 14; - tsk->thread.error_code = error_code; - die("Oops", regs, error_code); - bust_spinlocks(0); - do_exit(SIGKILL); - -/* - * We ran out of memory, or some other thing happened to us that made - * us unable to handle the page fault gracefully. - */ -out_of_memory: - up_read(&mm->mmap_sem); - if (is_init(tsk)) { - yield(); - down_read(&mm->mmap_sem); - goto survive; - } - printk("VM: killing process %s\n", tsk->comm); - if (error_code & 4) - do_exit(SIGKILL); - goto no_context; - -do_sigbus: - up_read(&mm->mmap_sem); - - /* Kernel mode? Handle exceptions or die */ - if (!(error_code & 4)) - goto no_context; - - /* User space => ok to do another page fault */ - if (is_prefetch(regs, address, error_code)) - return; - - tsk->thread.cr2 = address; - tsk->thread.error_code = error_code; - tsk->thread.trap_no = 14; - force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk); -} - -void vmalloc_sync_all(void) -{ - /* - * Note that races in the updates of insync and start aren't - * problematic: insync can only get set bits added, and updates to - * start are only improving performance (without affecting correctness - * if undone). - */ - static DECLARE_BITMAP(insync, PTRS_PER_PGD); - static unsigned long start = TASK_SIZE; - unsigned long address; - - if (SHARED_KERNEL_PMD) - return; - - BUILD_BUG_ON(TASK_SIZE & ~PGDIR_MASK); - for (address = start; address >= TASK_SIZE; address += PGDIR_SIZE) { - if (!test_bit(pgd_index(address), insync)) { - unsigned long flags; - struct page *page; - - spin_lock_irqsave(&pgd_lock, flags); - for (page = pgd_list; page; page = - (struct page *)page->index) - if (!vmalloc_sync_one(page_address(page), - address)) { - BUG_ON(page != pgd_list); - break; - } - spin_unlock_irqrestore(&pgd_lock, flags); - if (!page) - set_bit(pgd_index(address), insync); - } - if (address == start && test_bit(pgd_index(address), insync)) - start = address + PGDIR_SIZE; - } -} diff --git a/arch/i386/mm/highmem_32.c b/arch/i386/mm/highmem_32.c deleted file mode 100644 index 1c3bf95f735..00000000000 --- a/arch/i386/mm/highmem_32.c +++ /dev/null @@ -1,113 +0,0 @@ -#include <linux/highmem.h> -#include <linux/module.h> - -void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - -void kunmap(struct page *page) -{ - if (in_interrupt()) - BUG(); - if (!PageHighMem(page)) - return; - kunmap_high(page); -} - -/* - * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because - * no global lock is needed and because the kmap code must perform a global TLB - * invalidation when the kmap pool wraps. - * - * However when holding an atomic kmap is is not legal to sleep, so atomic - * kmaps are appropriate for short, tight code paths only. - */ -void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot) -{ - enum fixed_addresses idx; - unsigned long vaddr; - - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */ - pagefault_disable(); - - if (!PageHighMem(page)) - return page_address(page); - - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - BUG_ON(!pte_none(*(kmap_pte-idx))); - set_pte(kmap_pte-idx, mk_pte(page, prot)); - arch_flush_lazy_mmu_mode(); - - return (void *)vaddr; -} - -void *kmap_atomic(struct page *page, enum km_type type) -{ - return kmap_atomic_prot(page, type, kmap_prot); -} - -void kunmap_atomic(void *kvaddr, enum km_type type) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); - - /* - * Force other mappings to Oops if they'll try to access this pte - * without first remap it. Keeping stale mappings around is a bad idea - * also, in case the page changes cacheability attributes or becomes - * a protected page in a hypervisor. - */ - if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx)) - kpte_clear_flush(kmap_pte-idx, vaddr); - else { -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(vaddr < PAGE_OFFSET); - BUG_ON(vaddr >= (unsigned long)high_memory); -#endif - } - - arch_flush_lazy_mmu_mode(); - pagefault_enable(); -} - -/* This is the same as kmap_atomic() but can map memory that doesn't - * have a struct page associated with it. - */ -void *kmap_atomic_pfn(unsigned long pfn, enum km_type type) -{ - enum fixed_addresses idx; - unsigned long vaddr; - - pagefault_disable(); - - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot)); - arch_flush_lazy_mmu_mode(); - - return (void*) vaddr; -} - -struct page *kmap_atomic_to_page(void *ptr) -{ - unsigned long idx, vaddr = (unsigned long)ptr; - pte_t *pte; - - if (vaddr < FIXADDR_START) - return virt_to_page(ptr); - - idx = virt_to_fix(vaddr); - pte = kmap_pte - (idx - FIX_KMAP_BEGIN); - return pte_page(*pte); -} - -EXPORT_SYMBOL(kmap); -EXPORT_SYMBOL(kunmap); -EXPORT_SYMBOL(kmap_atomic); -EXPORT_SYMBOL(kunmap_atomic); -EXPORT_SYMBOL(kmap_atomic_to_page); diff --git a/arch/i386/mm/hugetlbpage.c b/arch/i386/mm/hugetlbpage.c deleted file mode 100644 index 6c06d9c0488..00000000000 --- a/arch/i386/mm/hugetlbpage.c +++ /dev/null @@ -1,391 +0,0 @@ -/* - * IA-32 Huge TLB Page Support for Kernel. - * - * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> - */ - -#include <linux/init.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/pagemap.h> -#include <linux/slab.h> -#include <linux/err.h> -#include <linux/sysctl.h> -#include <asm/mman.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> - -static unsigned long page_table_shareable(struct vm_area_struct *svma, - struct vm_area_struct *vma, - unsigned long addr, pgoff_t idx) -{ - unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) + - svma->vm_start; - unsigned long sbase = saddr & PUD_MASK; - unsigned long s_end = sbase + PUD_SIZE; - - /* - * match the virtual addresses, permission and the alignment of the - * page table page. - */ - if (pmd_index(addr) != pmd_index(saddr) || - vma->vm_flags != svma->vm_flags || - sbase < svma->vm_start || svma->vm_end < s_end) - return 0; - - return saddr; -} - -static int vma_shareable(struct vm_area_struct *vma, unsigned long addr) -{ - unsigned long base = addr & PUD_MASK; - unsigned long end = base + PUD_SIZE; - - /* - * check on proper vm_flags and page table alignment - */ - if (vma->vm_flags & VM_MAYSHARE && - vma->vm_start <= base && end <= vma->vm_end) - return 1; - return 0; -} - -/* - * search for a shareable pmd page for hugetlb. - */ -static void huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) -{ - struct vm_area_struct *vma = find_vma(mm, addr); - struct address_space *mapping = vma->vm_file->f_mapping; - pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + - vma->vm_pgoff; - struct prio_tree_iter iter; - struct vm_area_struct *svma; - unsigned long saddr; - pte_t *spte = NULL; - - if (!vma_shareable(vma, addr)) - return; - - spin_lock(&mapping->i_mmap_lock); - vma_prio_tree_foreach(svma, &iter, &mapping->i_mmap, idx, idx) { - if (svma == vma) - continue; - - saddr = page_table_shareable(svma, vma, addr, idx); - if (saddr) { - spte = huge_pte_offset(svma->vm_mm, saddr); - if (spte) { - get_page(virt_to_page(spte)); - break; - } - } - } - - if (!spte) - goto out; - - spin_lock(&mm->page_table_lock); - if (pud_none(*pud)) - pud_populate(mm, pud, (unsigned long) spte & PAGE_MASK); - else - put_page(virt_to_page(spte)); - spin_unlock(&mm->page_table_lock); -out: - spin_unlock(&mapping->i_mmap_lock); -} - -/* - * unmap huge page backed by shared pte. - * - * Hugetlb pte page is ref counted at the time of mapping. If pte is shared - * indicated by page_count > 1, unmap is achieved by clearing pud and - * decrementing the ref count. If count == 1, the pte page is not shared. - * - * called with vma->vm_mm->page_table_lock held. - * - * returns: 1 successfully unmapped a shared pte page - * 0 the underlying pte page is not shared, or it is the last user - */ -int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) -{ - pgd_t *pgd = pgd_offset(mm, *addr); - pud_t *pud = pud_offset(pgd, *addr); - - BUG_ON(page_count(virt_to_page(ptep)) == 0); - if (page_count(virt_to_page(ptep)) == 1) - return 0; - - pud_clear(pud); - put_page(virt_to_page(ptep)); - *addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE; - return 1; -} - -pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) -{ - pgd_t *pgd; - pud_t *pud; - pte_t *pte = NULL; - - pgd = pgd_offset(mm, addr); - pud = pud_alloc(mm, pgd, addr); - if (pud) { - if (pud_none(*pud)) - huge_pmd_share(mm, addr, pud); - pte = (pte_t *) pmd_alloc(mm, pud, addr); - } - BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte)); - - return pte; -} - -pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd = NULL; - - pgd = pgd_offset(mm, addr); - if (pgd_present(*pgd)) { - pud = pud_offset(pgd, addr); - if (pud_present(*pud)) - pmd = pmd_offset(pud, addr); - } - return (pte_t *) pmd; -} - -#if 0 /* This is just for testing */ -struct page * -follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) -{ - unsigned long start = address; - int length = 1; - int nr; - struct page *page; - struct vm_area_struct *vma; - - vma = find_vma(mm, addr); - if (!vma || !is_vm_hugetlb_page(vma)) - return ERR_PTR(-EINVAL); - - pte = huge_pte_offset(mm, address); - - /* hugetlb should be locked, and hence, prefaulted */ - WARN_ON(!pte || pte_none(*pte)); - - page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; - - WARN_ON(!PageCompound(page)); - - return page; -} - -int pmd_huge(pmd_t pmd) -{ - return 0; -} - -struct page * -follow_huge_pmd(struct mm_struct *mm, unsigned long address, - pmd_t *pmd, int write) -{ - return NULL; -} - -#else - -struct page * -follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) -{ - return ERR_PTR(-EINVAL); -} - -int pmd_huge(pmd_t pmd) -{ - return !!(pmd_val(pmd) & _PAGE_PSE); -} - -struct page * -follow_huge_pmd(struct mm_struct *mm, unsigned long address, - pmd_t *pmd, int write) -{ - struct page *page; - - page = pte_page(*(pte_t *)pmd); - if (page) - page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT); - return page; -} -#endif - -/* x86_64 also uses this file */ - -#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA -static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, - unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags) -{ - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - unsigned long start_addr; - - if (len > mm->cached_hole_size) { - start_addr = mm->free_area_cache; - } else { - start_addr = TASK_UNMAPPED_BASE; - mm->cached_hole_size = 0; - } - -full_search: - addr = ALIGN(start_addr, HPAGE_SIZE); - - for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { - /* At this point: (!vma || addr < vma->vm_end). */ - if (TASK_SIZE - len < addr) { - /* - * Start a new search - just in case we missed - * some holes. - */ - if (start_addr != TASK_UNMAPPED_BASE) { - start_addr = TASK_UNMAPPED_BASE; - mm->cached_hole_size = 0; - goto full_search; - } - return -ENOMEM; - } - if (!vma || addr + len <= vma->vm_start) { - mm->free_area_cache = addr + len; - return addr; - } - if (addr + mm->cached_hole_size < vma->vm_start) - mm->cached_hole_size = vma->vm_start - addr; - addr = ALIGN(vma->vm_end, HPAGE_SIZE); - } -} - -static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file, - unsigned long addr0, unsigned long len, - unsigned long pgoff, unsigned long flags) -{ - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma, *prev_vma; - unsigned long base = mm->mmap_base, addr = addr0; - unsigned long largest_hole = mm->cached_hole_size; - int first_time = 1; - - /* don't allow allocations above current base */ - if (mm->free_area_cache > base) - mm->free_area_cache = base; - - if (len <= largest_hole) { - largest_hole = 0; - mm->free_area_cache = base; - } -try_again: - /* make sure it can fit in the remaining address space */ - if (mm->free_area_cache < len) - goto fail; - - /* either no address requested or cant fit in requested address hole */ - addr = (mm->free_area_cache - len) & HPAGE_MASK; - do { - /* - * Lookup failure means no vma is above this address, - * i.e. return with success: - */ - if (!(vma = find_vma_prev(mm, addr, &prev_vma))) - return addr; - - /* - * new region fits between prev_vma->vm_end and - * vma->vm_start, use it: - */ - if (addr + len <= vma->vm_start && - (!prev_vma || (addr >= prev_vma->vm_end))) { - /* remember the address as a hint for next time */ - mm->cached_hole_size = largest_hole; - return (mm->free_area_cache = addr); - } else { - /* pull free_area_cache down to the first hole */ - if (mm->free_area_cache == vma->vm_end) { - mm->free_area_cache = vma->vm_start; - mm->cached_hole_size = largest_hole; - } - } - - /* remember the largest hole we saw so far */ - if (addr + largest_hole < vma->vm_start) - largest_hole = vma->vm_start - addr; - - /* try just below the current vma->vm_start */ - addr = (vma->vm_start - len) & HPAGE_MASK; - } while (len <= vma->vm_start); - -fail: - /* - * if hint left us with no space for the requested - * mapping then try again: - */ - if (first_time) { - mm->free_area_cache = base; - largest_hole = 0; - first_time = 0; - goto try_again; - } - /* - * A failed mmap() very likely causes application failure, - * so fall back to the bottom-up function here. This scenario - * can happen with large stack limits and large mmap() - * allocations. - */ - mm->free_area_cache = TASK_UNMAPPED_BASE; - mm->cached_hole_size = ~0UL; - addr = hugetlb_get_unmapped_area_bottomup(file, addr0, - len, pgoff, flags); - - /* - * Restore the topdown base: - */ - mm->free_area_cache = base; - mm->cached_hole_size = ~0UL; - - return addr; -} - -unsigned long -hugetlb_get_unmapped_area(struct file *file, unsigned long addr, - unsigned long len, unsigned long pgoff, unsigned long flags) -{ - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - - if (len & ~HPAGE_MASK) - return -EINVAL; - if (len > TASK_SIZE) - return -ENOMEM; - - if (flags & MAP_FIXED) { - if (prepare_hugepage_range(addr, len)) - return -EINVAL; - return addr; - } - - if (addr) { - addr = ALIGN(addr, HPAGE_SIZE); - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && - (!vma || addr + len <= vma->vm_start)) - return addr; - } - if (mm->get_unmapped_area == arch_get_unmapped_area) - return hugetlb_get_unmapped_area_bottomup(file, addr, len, - pgoff, flags); - else - return hugetlb_get_unmapped_area_topdown(file, addr, len, - pgoff, flags); -} - -#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/ - diff --git a/arch/i386/mm/init_32.c b/arch/i386/mm/init_32.c deleted file mode 100644 index 730a5b177b1..00000000000 --- a/arch/i386/mm/init_32.c +++ /dev/null @@ -1,858 +0,0 @@ -/* - * linux/arch/i386/mm/init.c - * - * Copyright (C) 1995 Linus Torvalds - * - * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 - */ - -#include <linux/module.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/highmem.h> -#include <linux/pagemap.h> -#include <linux/pfn.h> -#include <linux/poison.h> -#include <linux/bootmem.h> -#include <linux/slab.h> -#include <linux/proc_fs.h> -#include <linux/efi.h> -#include <linux/memory_hotplug.h> -#include <linux/initrd.h> -#include <linux/cpumask.h> - -#include <asm/processor.h> -#include <asm/system.h> -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/dma.h> -#include <asm/fixmap.h> -#include <asm/e820.h> -#include <asm/apic.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> -#include <asm/sections.h> -#include <asm/paravirt.h> - -unsigned int __VMALLOC_RESERVE = 128 << 20; - -DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); -unsigned long highstart_pfn, highend_pfn; - -static int noinline do_test_wp_bit(void); - -/* - * Creates a middle page table and puts a pointer to it in the - * given global directory entry. This only returns the gd entry - * in non-PAE compilation mode, since the middle layer is folded. - */ -static pmd_t * __init one_md_table_init(pgd_t *pgd) -{ - pud_t *pud; - pmd_t *pmd_table; - -#ifdef CONFIG_X86_PAE - if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { - pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); - - paravirt_alloc_pd(__pa(pmd_table) >> PAGE_SHIFT); - set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); - pud = pud_offset(pgd, 0); - if (pmd_table != pmd_offset(pud, 0)) - BUG(); - } -#endif - pud = pud_offset(pgd, 0); - pmd_table = pmd_offset(pud, 0); - return pmd_table; -} - -/* - * Create a page table and place a pointer to it in a middle page - * directory entry. - */ -static pte_t * __init one_page_table_init(pmd_t *pmd) -{ - if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { - pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); - - paravirt_alloc_pt(&init_mm, __pa(page_table) >> PAGE_SHIFT); - set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); - BUG_ON(page_table != pte_offset_kernel(pmd, 0)); - } - - return pte_offset_kernel(pmd, 0); -} - -/* - * This function initializes a certain range of kernel virtual memory - * with new bootmem page tables, everywhere page tables are missing in - * the given range. - */ - -/* - * NOTE: The pagetables are allocated contiguous on the physical space - * so we can cache the place of the first one and move around without - * checking the pgd every time. - */ -static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base) -{ - pgd_t *pgd; - pmd_t *pmd; - int pgd_idx, pmd_idx; - unsigned long vaddr; - - vaddr = start; - pgd_idx = pgd_index(vaddr); - pmd_idx = pmd_index(vaddr); - pgd = pgd_base + pgd_idx; - - for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { - pmd = one_md_table_init(pgd); - pmd = pmd + pmd_index(vaddr); - for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) { - one_page_table_init(pmd); - - vaddr += PMD_SIZE; - } - pmd_idx = 0; - } -} - -static inline int is_kernel_text(unsigned long addr) -{ - if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) - return 1; - return 0; -} - -/* - * This maps the physical memory to kernel virtual address space, a total - * of max_low_pfn pages, by creating page tables starting from address - * PAGE_OFFSET. - */ -static void __init kernel_physical_mapping_init(pgd_t *pgd_base) -{ - unsigned long pfn; - pgd_t *pgd; - pmd_t *pmd; - pte_t *pte; - int pgd_idx, pmd_idx, pte_ofs; - - pgd_idx = pgd_index(PAGE_OFFSET); - pgd = pgd_base + pgd_idx; - pfn = 0; - - for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { - pmd = one_md_table_init(pgd); - if (pfn >= max_low_pfn) - continue; - for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) { - unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET; - - /* Map with big pages if possible, otherwise create normal page tables. */ - if (cpu_has_pse) { - unsigned int address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1; - if (is_kernel_text(address) || is_kernel_text(address2)) - set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC)); - else - set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE)); - - pfn += PTRS_PER_PTE; - } else { - pte = one_page_table_init(pmd); - - for (pte_ofs = 0; - pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; - pte++, pfn++, pte_ofs++, address += PAGE_SIZE) { - if (is_kernel_text(address)) - set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); - else - set_pte(pte, pfn_pte(pfn, PAGE_KERNEL)); - } - } - } - } -} - -static inline int page_kills_ppro(unsigned long pagenr) -{ - if (pagenr >= 0x70000 && pagenr <= 0x7003F) - return 1; - return 0; -} - -int page_is_ram(unsigned long pagenr) -{ - int i; - unsigned long addr, end; - - if (efi_enabled) { - efi_memory_desc_t *md; - void *p; - - for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { - md = p; - if (!is_available_memory(md)) - continue; - addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT; - end = (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >> PAGE_SHIFT; - - if ((pagenr >= addr) && (pagenr < end)) - return 1; - } - return 0; - } - - for (i = 0; i < e820.nr_map; i++) { - - if (e820.map[i].type != E820_RAM) /* not usable memory */ - continue; - /* - * !!!FIXME!!! Some BIOSen report areas as RAM that - * are not. Notably the 640->1Mb area. We need a sanity - * check here. - */ - addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT; - end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT; - if ((pagenr >= addr) && (pagenr < end)) - return 1; - } - return 0; -} - -#ifdef CONFIG_HIGHMEM -pte_t *kmap_pte; -pgprot_t kmap_prot; - -#define kmap_get_fixmap_pte(vaddr) \ - pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr)) - -static void __init kmap_init(void) -{ - unsigned long kmap_vstart; - - /* cache the first kmap pte */ - kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = kmap_get_fixmap_pte(kmap_vstart); - - kmap_prot = PAGE_KERNEL; -} - -static void __init permanent_kmaps_init(pgd_t *pgd_base) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - unsigned long vaddr; - - vaddr = PKMAP_BASE; - page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); - - pgd = swapper_pg_dir + pgd_index(vaddr); - pud = pud_offset(pgd, vaddr); - pmd = pmd_offset(pud, vaddr); - pte = pte_offset_kernel(pmd, vaddr); - pkmap_page_table = pte; -} - -static void __meminit free_new_highpage(struct page *page) -{ - init_page_count(page); - __free_page(page); - totalhigh_pages++; -} - -void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro) -{ - if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) { - ClearPageReserved(page); - free_new_highpage(page); - } else - SetPageReserved(page); -} - -static int __meminit add_one_highpage_hotplug(struct page *page, unsigned long pfn) -{ - free_new_highpage(page); - totalram_pages++; -#ifdef CONFIG_FLATMEM - max_mapnr = max(pfn, max_mapnr); -#endif - num_physpages++; - return 0; -} - -/* - * Not currently handling the NUMA case. - * Assuming single node and all memory that - * has been added dynamically that would be - * onlined here is in HIGHMEM - */ -void __meminit online_page(struct page *page) -{ - ClearPageReserved(page); - add_one_highpage_hotplug(page, page_to_pfn(page)); -} - - -#ifdef CONFIG_NUMA -extern void set_highmem_pages_init(int); -#else -static void __init set_highmem_pages_init(int bad_ppro) -{ - int pfn; - for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) - add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro); - totalram_pages += totalhigh_pages; -} -#endif /* CONFIG_FLATMEM */ - -#else -#define kmap_init() do { } while (0) -#define permanent_kmaps_init(pgd_base) do { } while (0) -#define set_highmem_pages_init(bad_ppro) do { } while (0) -#endif /* CONFIG_HIGHMEM */ - -unsigned long long __PAGE_KERNEL = _PAGE_KERNEL; -EXPORT_SYMBOL(__PAGE_KERNEL); -unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC; - -#ifdef CONFIG_NUMA -extern void __init remap_numa_kva(void); -#else -#define remap_numa_kva() do {} while (0) -#endif - -void __init native_pagetable_setup_start(pgd_t *base) -{ -#ifdef CONFIG_X86_PAE - int i; - - /* - * Init entries of the first-level page table to the - * zero page, if they haven't already been set up. - * - * In a normal native boot, we'll be running on a - * pagetable rooted in swapper_pg_dir, but not in PAE - * mode, so this will end up clobbering the mappings - * for the lower 24Mbytes of the address space, - * without affecting the kernel address space. - */ - for (i = 0; i < USER_PTRS_PER_PGD; i++) - set_pgd(&base[i], - __pgd(__pa(empty_zero_page) | _PAGE_PRESENT)); - - /* Make sure kernel address space is empty so that a pagetable - will be allocated for it. */ - memset(&base[USER_PTRS_PER_PGD], 0, - KERNEL_PGD_PTRS * sizeof(pgd_t)); -#else - paravirt_alloc_pd(__pa(swapper_pg_dir) >> PAGE_SHIFT); -#endif -} - -void __init native_pagetable_setup_done(pgd_t *base) -{ -#ifdef CONFIG_X86_PAE - /* - * Add low memory identity-mappings - SMP needs it when - * starting up on an AP from real-mode. In the non-PAE - * case we already have these mappings through head.S. - * All user-space mappings are explicitly cleared after - * SMP startup. - */ - set_pgd(&base[0], base[USER_PTRS_PER_PGD]); -#endif -} - -/* - * Build a proper pagetable for the kernel mappings. Up until this - * point, we've been running on some set of pagetables constructed by - * the boot process. - * - * If we're booting on native hardware, this will be a pagetable - * constructed in arch/i386/kernel/head.S, and not running in PAE mode - * (even if we'll end up running in PAE). The root of the pagetable - * will be swapper_pg_dir. - * - * If we're booting paravirtualized under a hypervisor, then there are - * more options: we may already be running PAE, and the pagetable may - * or may not be based in swapper_pg_dir. In any case, - * paravirt_pagetable_setup_start() will set up swapper_pg_dir - * appropriately for the rest of the initialization to work. - * - * In general, pagetable_init() assumes that the pagetable may already - * be partially populated, and so it avoids stomping on any existing - * mappings. - */ -static void __init pagetable_init (void) -{ - unsigned long vaddr, end; - pgd_t *pgd_base = swapper_pg_dir; - - paravirt_pagetable_setup_start(pgd_base); - - /* Enable PSE if available */ - if (cpu_has_pse) - set_in_cr4(X86_CR4_PSE); - - /* Enable PGE if available */ - if (cpu_has_pge) { - set_in_cr4(X86_CR4_PGE); - __PAGE_KERNEL |= _PAGE_GLOBAL; - __PAGE_KERNEL_EXEC |= _PAGE_GLOBAL; - } - - kernel_physical_mapping_init(pgd_base); - remap_numa_kva(); - - /* - * Fixed mappings, only the page table structure has to be - * created - mappings will be set by set_fixmap(): - */ - vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; - end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; - page_table_range_init(vaddr, end, pgd_base); - - permanent_kmaps_init(pgd_base); - - paravirt_pagetable_setup_done(pgd_base); -} - -#if defined(CONFIG_HIBERNATION) || defined(CONFIG_ACPI) -/* - * Swap suspend & friends need this for resume because things like the intel-agp - * driver might have split up a kernel 4MB mapping. - */ -char __nosavedata swsusp_pg_dir[PAGE_SIZE] - __attribute__ ((aligned (PAGE_SIZE))); - -static inline void save_pg_dir(void) -{ - memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); -} -#else -static inline void save_pg_dir(void) -{ -} -#endif - -void zap_low_mappings (void) -{ - int i; - - save_pg_dir(); - - /* - * Zap initial low-memory mappings. - * - * Note that "pgd_clear()" doesn't do it for - * us, because pgd_clear() is a no-op on i386. - */ - for (i = 0; i < USER_PTRS_PER_PGD; i++) -#ifdef CONFIG_X86_PAE - set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); -#else - set_pgd(swapper_pg_dir+i, __pgd(0)); -#endif - flush_tlb_all(); -} - -int nx_enabled = 0; - -#ifdef CONFIG_X86_PAE - -static int disable_nx __initdata = 0; -u64 __supported_pte_mask __read_mostly = ~_PAGE_NX; -EXPORT_SYMBOL_GPL(__supported_pte_mask); - -/* - * noexec = on|off - * - * Control non executable mappings. - * - * on Enable - * off Disable - */ -static int __init noexec_setup(char *str) -{ - if (!str || !strcmp(str, "on")) { - if (cpu_has_nx) { - __supported_pte_mask |= _PAGE_NX; - disable_nx = 0; - } - } else if (!strcmp(str,"off")) { - disable_nx = 1; - __supported_pte_mask &= ~_PAGE_NX; - } else - return -EINVAL; - - return 0; -} -early_param("noexec", noexec_setup); - -static void __init set_nx(void) -{ - unsigned int v[4], l, h; - - if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { - cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); - if ((v[3] & (1 << 20)) && !disable_nx) { - rdmsr(MSR_EFER, l, h); - l |= EFER_NX; - wrmsr(MSR_EFER, l, h); - nx_enabled = 1; - __supported_pte_mask |= _PAGE_NX; - } - } -} - -/* - * Enables/disables executability of a given kernel page and - * returns the previous setting. - */ -int __init set_kernel_exec(unsigned long vaddr, int enable) -{ - pte_t *pte; - int ret = 1; - - if (!nx_enabled) - goto out; - - pte = lookup_address(vaddr); - BUG_ON(!pte); - - if (!pte_exec_kernel(*pte)) - ret = 0; - - if (enable) - pte->pte_high &= ~(1 << (_PAGE_BIT_NX - 32)); - else - pte->pte_high |= 1 << (_PAGE_BIT_NX - 32); - pte_update_defer(&init_mm, vaddr, pte); - __flush_tlb_all(); -out: - return ret; -} - -#endif - -/* - * paging_init() sets up the page tables - note that the first 8MB are - * already mapped by head.S. - * - * This routines also unmaps the page at virtual kernel address 0, so - * that we can trap those pesky NULL-reference errors in the kernel. - */ -void __init paging_init(void) -{ -#ifdef CONFIG_X86_PAE - set_nx(); - if (nx_enabled) - printk("NX (Execute Disable) protection: active\n"); -#endif - - pagetable_init(); - - load_cr3(swapper_pg_dir); - -#ifdef CONFIG_X86_PAE - /* - * We will bail out later - printk doesn't work right now so - * the user would just see a hanging kernel. - */ - if (cpu_has_pae) - set_in_cr4(X86_CR4_PAE); -#endif - __flush_tlb_all(); - - kmap_init(); -} - -/* - * Test if the WP bit works in supervisor mode. It isn't supported on 386's - * and also on some strange 486's (NexGen etc.). All 586+'s are OK. This - * used to involve black magic jumps to work around some nasty CPU bugs, - * but fortunately the switch to using exceptions got rid of all that. - */ - -static void __init test_wp_bit(void) -{ - printk("Checking if this processor honours the WP bit even in supervisor mode... "); - - /* Any page-aligned address will do, the test is non-destructive */ - __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); - boot_cpu_data.wp_works_ok = do_test_wp_bit(); - clear_fixmap(FIX_WP_TEST); - - if (!boot_cpu_data.wp_works_ok) { - printk("No.\n"); -#ifdef CONFIG_X86_WP_WORKS_OK - panic("This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); -#endif - } else { - printk("Ok.\n"); - } -} - -static struct kcore_list kcore_mem, kcore_vmalloc; - -void __init mem_init(void) -{ - extern int ppro_with_ram_bug(void); - int codesize, reservedpages, datasize, initsize; - int tmp; - int bad_ppro; - -#ifdef CONFIG_FLATMEM - BUG_ON(!mem_map); -#endif - - bad_ppro = ppro_with_ram_bug(); - -#ifdef CONFIG_HIGHMEM - /* check that fixmap and pkmap do not overlap */ - if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { - printk(KERN_ERR "fixmap and kmap areas overlap - this will crash\n"); - printk(KERN_ERR "pkstart: %lxh pkend: %lxh fixstart %lxh\n", - PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, FIXADDR_START); - BUG(); - } -#endif - - /* this will put all low memory onto the freelists */ - totalram_pages += free_all_bootmem(); - - reservedpages = 0; - for (tmp = 0; tmp < max_low_pfn; tmp++) - /* - * Only count reserved RAM pages - */ - if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) - reservedpages++; - - set_highmem_pages_init(bad_ppro); - - codesize = (unsigned long) &_etext - (unsigned long) &_text; - datasize = (unsigned long) &_edata - (unsigned long) &_etext; - initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; - - kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); - kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, - VMALLOC_END-VMALLOC_START); - - printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", - (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), - num_physpages << (PAGE_SHIFT-10), - codesize >> 10, - reservedpages << (PAGE_SHIFT-10), - datasize >> 10, - initsize >> 10, - (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) - ); - -#if 1 /* double-sanity-check paranoia */ - printk("virtual kernel memory layout:\n" - " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#ifdef CONFIG_HIGHMEM - " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#endif - " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" - " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" - " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", - FIXADDR_START, FIXADDR_TOP, - (FIXADDR_TOP - FIXADDR_START) >> 10, - -#ifdef CONFIG_HIGHMEM - PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, - (LAST_PKMAP*PAGE_SIZE) >> 10, -#endif - - VMALLOC_START, VMALLOC_END, - (VMALLOC_END - VMALLOC_START) >> 20, - - (unsigned long)__va(0), (unsigned long)high_memory, - ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, - - (unsigned long)&__init_begin, (unsigned long)&__init_end, - ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10, - - (unsigned long)&_etext, (unsigned long)&_edata, - ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, - - (unsigned long)&_text, (unsigned long)&_etext, - ((unsigned long)&_etext - (unsigned long)&_text) >> 10); - -#ifdef CONFIG_HIGHMEM - BUG_ON(PKMAP_BASE+LAST_PKMAP*PAGE_SIZE > FIXADDR_START); - BUG_ON(VMALLOC_END > PKMAP_BASE); -#endif - BUG_ON(VMALLOC_START > VMALLOC_END); - BUG_ON((unsigned long)high_memory > VMALLOC_START); -#endif /* double-sanity-check paranoia */ - -#ifdef CONFIG_X86_PAE - if (!cpu_has_pae) - panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!"); -#endif - if (boot_cpu_data.wp_works_ok < 0) - test_wp_bit(); - - /* - * Subtle. SMP is doing it's boot stuff late (because it has to - * fork idle threads) - but it also needs low mappings for the - * protected-mode entry to work. We zap these entries only after - * the WP-bit has been tested. - */ -#ifndef CONFIG_SMP - zap_low_mappings(); -#endif -} - -#ifdef CONFIG_MEMORY_HOTPLUG -int arch_add_memory(int nid, u64 start, u64 size) -{ - struct pglist_data *pgdata = NODE_DATA(nid); - struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; - unsigned long start_pfn = start >> PAGE_SHIFT; - unsigned long nr_pages = size >> PAGE_SHIFT; - - return __add_pages(zone, start_pfn, nr_pages); -} - -int remove_memory(u64 start, u64 size) -{ - return -EINVAL; -} -EXPORT_SYMBOL_GPL(remove_memory); -#endif - -struct kmem_cache *pmd_cache; - -void __init pgtable_cache_init(void) -{ - size_t pgd_size = PTRS_PER_PGD*sizeof(pgd_t); - - if (PTRS_PER_PMD > 1) { - pmd_cache = kmem_cache_create("pmd", - PTRS_PER_PMD*sizeof(pmd_t), - PTRS_PER_PMD*sizeof(pmd_t), - SLAB_PANIC, - pmd_ctor); - if (!SHARED_KERNEL_PMD) { - /* If we're in PAE mode and have a non-shared - kernel pmd, then the pgd size must be a - page size. This is because the pgd_list - links through the page structure, so there - can only be one pgd per page for this to - work. */ - pgd_size = PAGE_SIZE; - } - } -} - -/* - * This function cannot be __init, since exceptions don't work in that - * section. Put this after the callers, so that it cannot be inlined. - */ -static int noinline do_test_wp_bit(void) -{ - char tmp_reg; - int flag; - - __asm__ __volatile__( - " movb %0,%1 \n" - "1: movb %1,%0 \n" - " xorl %2,%2 \n" - "2: \n" - ".section __ex_table,\"a\"\n" - " .align 4 \n" - " .long 1b,2b \n" - ".previous \n" - :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), - "=q" (tmp_reg), - "=r" (flag) - :"2" (1) - :"memory"); - - return flag; -} - -#ifdef CONFIG_DEBUG_RODATA - -void mark_rodata_ro(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long size = PFN_ALIGN(_etext) - start; - -#ifndef CONFIG_KPROBES -#ifdef CONFIG_HOTPLUG_CPU - /* It must still be possible to apply SMP alternatives. */ - if (num_possible_cpus() <= 1) -#endif - { - change_page_attr(virt_to_page(start), - size >> PAGE_SHIFT, PAGE_KERNEL_RX); - printk("Write protecting the kernel text: %luk\n", size >> 10); - } -#endif - start += size; - size = (unsigned long)__end_rodata - start; - change_page_attr(virt_to_page(start), - size >> PAGE_SHIFT, PAGE_KERNEL_RO); - printk("Write protecting the kernel read-only data: %luk\n", - size >> 10); - - /* - * change_page_attr() requires a global_flush_tlb() call after it. - * We do this after the printk so that if something went wrong in the - * change, the printk gets out at least to give a better debug hint - * of who is the culprit. - */ - global_flush_tlb(); -} -#endif - -void free_init_pages(char *what, unsigned long begin, unsigned long end) -{ - unsigned long addr; - - for (addr = begin; addr < end; addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - init_page_count(virt_to_page(addr)); - memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); - free_page(addr); - totalram_pages++; - } - printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); -} - -void free_initmem(void) -{ - free_init_pages("unused kernel memory", - (unsigned long)(&__init_begin), - (unsigned long)(&__init_end)); -} - -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - free_init_pages("initrd memory", start, end); -} -#endif - diff --git a/arch/i386/mm/ioremap_32.c b/arch/i386/mm/ioremap_32.c deleted file mode 100644 index 0b278315d73..00000000000 --- a/arch/i386/mm/ioremap_32.c +++ /dev/null @@ -1,274 +0,0 @@ -/* - * arch/i386/mm/ioremap.c - * - * Re-map IO memory to kernel address space so that we can access it. - * This is needed for high PCI addresses that aren't mapped in the - * 640k-1MB IO memory area on PC's - * - * (C) Copyright 1995 1996 Linus Torvalds - */ - -#include <linux/vmalloc.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/io.h> -#include <asm/fixmap.h> -#include <asm/cacheflush.h> -#include <asm/tlbflush.h> -#include <asm/pgtable.h> - -#define ISA_START_ADDRESS 0xa0000 -#define ISA_END_ADDRESS 0x100000 - -/* - * Generic mapping function (not visible outside): - */ - -/* - * Remap an arbitrary physical address space into the kernel virtual - * address space. Needed when the kernel wants to access high addresses - * directly. - * - * NOTE! We need to allow non-page-aligned mappings too: we will obviously - * have to convert them into an offset in a page-aligned mapping, but the - * caller shouldn't need to know that small detail. - */ -void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) -{ - void __iomem * addr; - struct vm_struct * area; - unsigned long offset, last_addr; - pgprot_t prot; - - /* Don't allow wraparound or zero size */ - last_addr = phys_addr + size - 1; - if (!size || last_addr < phys_addr) - return NULL; - - /* - * Don't remap the low PCI/ISA area, it's always mapped.. - */ - if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) - return (void __iomem *) phys_to_virt(phys_addr); - - /* - * Don't allow anybody to remap normal RAM that we're using.. - */ - if (phys_addr <= virt_to_phys(high_memory - 1)) { - char *t_addr, *t_end; - struct page *page; - - t_addr = __va(phys_addr); - t_end = t_addr + (size - 1); - - for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++) - if(!PageReserved(page)) - return NULL; - } - - prot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY - | _PAGE_ACCESSED | flags); - - /* - * Mappings have to be page-aligned - */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr+1) - phys_addr; - - /* - * Ok, go for it.. - */ - area = get_vm_area(size, VM_IOREMAP | (flags << 20)); - if (!area) - return NULL; - area->phys_addr = phys_addr; - addr = (void __iomem *) area->addr; - if (ioremap_page_range((unsigned long) addr, - (unsigned long) addr + size, phys_addr, prot)) { - vunmap((void __force *) addr); - return NULL; - } - return (void __iomem *) (offset + (char __iomem *)addr); -} -EXPORT_SYMBOL(__ioremap); - -/** - * ioremap_nocache - map bus memory into CPU space - * @offset: bus address of the memory - * @size: size of the resource to map - * - * ioremap_nocache performs a platform specific sequence of operations to - * make bus memory CPU accessible via the readb/readw/readl/writeb/ - * writew/writel functions and the other mmio helpers. The returned - * address is not guaranteed to be usable directly as a virtual - * address. - * - * This version of ioremap ensures that the memory is marked uncachable - * on the CPU as well as honouring existing caching rules from things like - * the PCI bus. Note that there are other caches and buffers on many - * busses. In particular driver authors should read up on PCI writes - * - * It's useful if some control registers are in such an area and - * write combining or read caching is not desirable: - * - * Must be freed with iounmap. - */ - -void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size) -{ - unsigned long last_addr; - void __iomem *p = __ioremap(phys_addr, size, _PAGE_PCD); - if (!p) - return p; - - /* Guaranteed to be > phys_addr, as per __ioremap() */ - last_addr = phys_addr + size - 1; - - if (last_addr < virt_to_phys(high_memory) - 1) { - struct page *ppage = virt_to_page(__va(phys_addr)); - unsigned long npages; - - phys_addr &= PAGE_MASK; - - /* This might overflow and become zero.. */ - last_addr = PAGE_ALIGN(last_addr); - - /* .. but that's ok, because modulo-2**n arithmetic will make - * the page-aligned "last - first" come out right. - */ - npages = (last_addr - phys_addr) >> PAGE_SHIFT; - - if (change_page_attr(ppage, npages, PAGE_KERNEL_NOCACHE) < 0) { - iounmap(p); - p = NULL; - } - global_flush_tlb(); - } - - return p; -} -EXPORT_SYMBOL(ioremap_nocache); - -/** - * iounmap - Free a IO remapping - * @addr: virtual address from ioremap_* - * - * Caller must ensure there is only one unmapping for the same pointer. - */ -void iounmap(volatile void __iomem *addr) -{ - struct vm_struct *p, *o; - - if ((void __force *)addr <= high_memory) - return; - - /* - * __ioremap special-cases the PCI/ISA range by not instantiating a - * vm_area and by simply returning an address into the kernel mapping - * of ISA space. So handle that here. - */ - if (addr >= phys_to_virt(ISA_START_ADDRESS) && - addr < phys_to_virt(ISA_END_ADDRESS)) - return; - - addr = (volatile void __iomem *)(PAGE_MASK & (unsigned long __force)addr); - - /* Use the vm area unlocked, assuming the caller - ensures there isn't another iounmap for the same address - in parallel. Reuse of the virtual address is prevented by - leaving it in the global lists until we're done with it. - cpa takes care of the direct mappings. */ - read_lock(&vmlist_lock); - for (p = vmlist; p; p = p->next) { - if (p->addr == addr) - break; - } - read_unlock(&vmlist_lock); - - if (!p) { - printk("iounmap: bad address %p\n", addr); - dump_stack(); - return; - } - - /* Reset the direct mapping. Can block */ - if ((p->flags >> 20) && p->phys_addr < virt_to_phys(high_memory) - 1) { - change_page_attr(virt_to_page(__va(p->phys_addr)), - get_vm_area_size(p) >> PAGE_SHIFT, - PAGE_KERNEL); - global_flush_tlb(); - } - - /* Finally remove it */ - o = remove_vm_area((void *)addr); - BUG_ON(p != o || o == NULL); - kfree(p); -} -EXPORT_SYMBOL(iounmap); - -void __init *bt_ioremap(unsigned long phys_addr, unsigned long size) -{ - unsigned long offset, last_addr; - unsigned int nrpages; - enum fixed_addresses idx; - - /* Don't allow wraparound or zero size */ - last_addr = phys_addr + size - 1; - if (!size || last_addr < phys_addr) - return NULL; - - /* - * Don't remap the low PCI/ISA area, it's always mapped.. - */ - if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) - return phys_to_virt(phys_addr); - - /* - * Mappings have to be page-aligned - */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr) - phys_addr; - - /* - * Mappings have to fit in the FIX_BTMAP area. - */ - nrpages = size >> PAGE_SHIFT; - if (nrpages > NR_FIX_BTMAPS) - return NULL; - - /* - * Ok, go for it.. - */ - idx = FIX_BTMAP_BEGIN; - while (nrpages > 0) { - set_fixmap(idx, phys_addr); - phys_addr += PAGE_SIZE; - --idx; - --nrpages; - } - return (void*) (offset + fix_to_virt(FIX_BTMAP_BEGIN)); -} - -void __init bt_iounmap(void *addr, unsigned long size) -{ - unsigned long virt_addr; - unsigned long offset; - unsigned int nrpages; - enum fixed_addresses idx; - - virt_addr = (unsigned long)addr; - if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) - return; - offset = virt_addr & ~PAGE_MASK; - nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; - - idx = FIX_BTMAP_BEGIN; - while (nrpages > 0) { - clear_fixmap(idx); - --idx; - --nrpages; - } -} diff --git a/arch/i386/mm/mmap_32.c b/arch/i386/mm/mmap_32.c deleted file mode 100644 index 552e0847375..00000000000 --- a/arch/i386/mm/mmap_32.c +++ /dev/null @@ -1,77 +0,0 @@ -/* - * linux/arch/i386/mm/mmap.c - * - * flexible mmap layout support - * - * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * - * Started by Ingo Molnar <mingo@elte.hu> - */ - -#include <linux/personality.h> -#include <linux/mm.h> -#include <linux/random.h> -#include <linux/sched.h> - -/* - * Top of mmap area (just below the process stack). - * - * Leave an at least ~128 MB hole. - */ -#define MIN_GAP (128*1024*1024) -#define MAX_GAP (TASK_SIZE/6*5) - -static inline unsigned long mmap_base(struct mm_struct *mm) -{ - unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur; - unsigned long random_factor = 0; - - if (current->flags & PF_RANDOMIZE) - random_factor = get_random_int() % (1024*1024); - - if (gap < MIN_GAP) - gap = MIN_GAP; - else if (gap > MAX_GAP) - gap = MAX_GAP; - - return PAGE_ALIGN(TASK_SIZE - gap - random_factor); -} - -/* - * This function, called very early during the creation of a new - * process VM image, sets up which VM layout function to use: - */ -void arch_pick_mmap_layout(struct mm_struct *mm) -{ - /* - * Fall back to the standard layout if the personality - * bit is set, or if the expected stack growth is unlimited: - */ - if (sysctl_legacy_va_layout || - (current->personality & ADDR_COMPAT_LAYOUT) || - current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) { - mm->mmap_base = TASK_UNMAPPED_BASE; - mm->get_unmapped_area = arch_get_unmapped_area; - mm->unmap_area = arch_unmap_area; - } else { - mm->mmap_base = mmap_base(mm); - mm->get_unmapped_area = arch_get_unmapped_area_topdown; - mm->unmap_area = arch_unmap_area_topdown; - } -} diff --git a/arch/i386/mm/pageattr_32.c b/arch/i386/mm/pageattr_32.c deleted file mode 100644 index 4241a74d16c..00000000000 --- a/arch/i386/mm/pageattr_32.c +++ /dev/null @@ -1,278 +0,0 @@ -/* - * Copyright 2002 Andi Kleen, SuSE Labs. - * Thanks to Ben LaHaise for precious feedback. - */ - -#include <linux/mm.h> -#include <linux/sched.h> -#include <linux/highmem.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <asm/uaccess.h> -#include <asm/processor.h> -#include <asm/tlbflush.h> -#include <asm/pgalloc.h> -#include <asm/sections.h> - -static DEFINE_SPINLOCK(cpa_lock); -static struct list_head df_list = LIST_HEAD_INIT(df_list); - - -pte_t *lookup_address(unsigned long address) -{ - pgd_t *pgd = pgd_offset_k(address); - pud_t *pud; - pmd_t *pmd; - if (pgd_none(*pgd)) - return NULL; - pud = pud_offset(pgd, address); - if (pud_none(*pud)) - return NULL; - pmd = pmd_offset(pud, address); - if (pmd_none(*pmd)) - return NULL; - if (pmd_large(*pmd)) - return (pte_t *)pmd; - return pte_offset_kernel(pmd, address); -} - -static struct page *split_large_page(unsigned long address, pgprot_t prot, - pgprot_t ref_prot) -{ - int i; - unsigned long addr; - struct page *base; - pte_t *pbase; - - spin_unlock_irq(&cpa_lock); - base = alloc_pages(GFP_KERNEL, 0); - spin_lock_irq(&cpa_lock); - if (!base) - return NULL; - - /* - * page_private is used to track the number of entries in - * the page table page that have non standard attributes. - */ - SetPagePrivate(base); - page_private(base) = 0; - - address = __pa(address); - addr = address & LARGE_PAGE_MASK; - pbase = (pte_t *)page_address(base); - paravirt_alloc_pt(&init_mm, page_to_pfn(base)); - for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) { - set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, - addr == address ? prot : ref_prot)); - } - return base; -} - -static void cache_flush_page(struct page *p) -{ - unsigned long adr = (unsigned long)page_address(p); - int i; - for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) - asm volatile("clflush (%0)" :: "r" (adr + i)); -} - -static void flush_kernel_map(void *arg) -{ - struct list_head *lh = (struct list_head *)arg; - struct page *p; - - /* High level code is not ready for clflush yet */ - if (0 && cpu_has_clflush) { - list_for_each_entry (p, lh, lru) - cache_flush_page(p); - } else if (boot_cpu_data.x86_model >= 4) - wbinvd(); - - /* Flush all to work around Errata in early athlons regarding - * large page flushing. - */ - __flush_tlb_all(); -} - -static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) -{ - struct page *page; - unsigned long flags; - - set_pte_atomic(kpte, pte); /* change init_mm */ - if (SHARED_KERNEL_PMD) - return; - - spin_lock_irqsave(&pgd_lock, flags); - for (page = pgd_list; page; page = (struct page *)page->index) { - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pgd = (pgd_t *)page_address(page) + pgd_index(address); - pud = pud_offset(pgd, address); - pmd = pmd_offset(pud, address); - set_pte_atomic((pte_t *)pmd, pte); - } - spin_unlock_irqrestore(&pgd_lock, flags); -} - -/* - * No more special protections in this 2/4MB area - revert to a - * large page again. - */ -static inline void revert_page(struct page *kpte_page, unsigned long address) -{ - pgprot_t ref_prot; - pte_t *linear; - - ref_prot = - ((address & LARGE_PAGE_MASK) < (unsigned long)&_etext) - ? PAGE_KERNEL_LARGE_EXEC : PAGE_KERNEL_LARGE; - - linear = (pte_t *) - pmd_offset(pud_offset(pgd_offset_k(address), address), address); - set_pmd_pte(linear, address, - pfn_pte((__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT, - ref_prot)); -} - -static inline void save_page(struct page *kpte_page) -{ - if (!test_and_set_bit(PG_arch_1, &kpte_page->flags)) - list_add(&kpte_page->lru, &df_list); -} - -static int -__change_page_attr(struct page *page, pgprot_t prot) -{ - pte_t *kpte; - unsigned long address; - struct page *kpte_page; - - BUG_ON(PageHighMem(page)); - address = (unsigned long)page_address(page); - - kpte = lookup_address(address); - if (!kpte) - return -EINVAL; - kpte_page = virt_to_page(kpte); - BUG_ON(PageLRU(kpte_page)); - BUG_ON(PageCompound(kpte_page)); - - if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) { - if (!pte_huge(*kpte)) { - set_pte_atomic(kpte, mk_pte(page, prot)); - } else { - pgprot_t ref_prot; - struct page *split; - - ref_prot = - ((address & LARGE_PAGE_MASK) < (unsigned long)&_etext) - ? PAGE_KERNEL_EXEC : PAGE_KERNEL; - split = split_large_page(address, prot, ref_prot); - if (!split) - return -ENOMEM; - set_pmd_pte(kpte,address,mk_pte(split, ref_prot)); - kpte_page = split; - } - page_private(kpte_page)++; - } else if (!pte_huge(*kpte)) { - set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL)); - BUG_ON(page_private(kpte_page) == 0); - page_private(kpte_page)--; - } else - BUG(); - - /* - * If the pte was reserved, it means it was created at boot - * time (not via split_large_page) and in turn we must not - * replace it with a largepage. - */ - - save_page(kpte_page); - if (!PageReserved(kpte_page)) { - if (cpu_has_pse && (page_private(kpte_page) == 0)) { - paravirt_release_pt(page_to_pfn(kpte_page)); - revert_page(kpte_page, address); - } - } - return 0; -} - -static inline void flush_map(struct list_head *l) -{ - on_each_cpu(flush_kernel_map, l, 1, 1); -} - -/* - * Change the page attributes of an page in the linear mapping. - * - * This should be used when a page is mapped with a different caching policy - * than write-back somewhere - some CPUs do not like it when mappings with - * different caching policies exist. This changes the page attributes of the - * in kernel linear mapping too. - * - * The caller needs to ensure that there are no conflicting mappings elsewhere. - * This function only deals with the kernel linear map. - * - * Caller must call global_flush_tlb() after this. - */ -int change_page_attr(struct page *page, int numpages, pgprot_t prot) -{ - int err = 0; - int i; - unsigned long flags; - - spin_lock_irqsave(&cpa_lock, flags); - for (i = 0; i < numpages; i++, page++) { - err = __change_page_attr(page, prot); - if (err) - break; - } - spin_unlock_irqrestore(&cpa_lock, flags); - return err; -} - -void global_flush_tlb(void) -{ - struct list_head l; - struct page *pg, *next; - - BUG_ON(irqs_disabled()); - - spin_lock_irq(&cpa_lock); - list_replace_init(&df_list, &l); - spin_unlock_irq(&cpa_lock); - flush_map(&l); - list_for_each_entry_safe(pg, next, &l, lru) { - list_del(&pg->lru); - clear_bit(PG_arch_1, &pg->flags); - if (PageReserved(pg) || !cpu_has_pse || page_private(pg) != 0) - continue; - ClearPagePrivate(pg); - __free_page(pg); - } -} - -#ifdef CONFIG_DEBUG_PAGEALLOC -void kernel_map_pages(struct page *page, int numpages, int enable) -{ - if (PageHighMem(page)) - return; - if (!enable) - debug_check_no_locks_freed(page_address(page), - numpages * PAGE_SIZE); - - /* the return value is ignored - the calls cannot fail, - * large pages are disabled at boot time. - */ - change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); - /* we should perform an IPI and flush all tlbs, - * but that can deadlock->flush only current cpu. - */ - __flush_tlb_all(); -} -#endif - -EXPORT_SYMBOL(change_page_attr); -EXPORT_SYMBOL(global_flush_tlb); diff --git a/arch/i386/mm/pgtable_32.c b/arch/i386/mm/pgtable_32.c deleted file mode 100644 index 01437c46baa..00000000000 --- a/arch/i386/mm/pgtable_32.c +++ /dev/null @@ -1,373 +0,0 @@ -/* - * linux/arch/i386/mm/pgtable.c - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/mm.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/highmem.h> -#include <linux/slab.h> -#include <linux/pagemap.h> -#include <linux/spinlock.h> -#include <linux/module.h> -#include <linux/quicklist.h> - -#include <asm/system.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/fixmap.h> -#include <asm/e820.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> - -void show_mem(void) -{ - int total = 0, reserved = 0; - int shared = 0, cached = 0; - int highmem = 0; - struct page *page; - pg_data_t *pgdat; - unsigned long i; - unsigned long flags; - - printk(KERN_INFO "Mem-info:\n"); - show_free_areas(); - printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); - for_each_online_pgdat(pgdat) { - pgdat_resize_lock(pgdat, &flags); - for (i = 0; i < pgdat->node_spanned_pages; ++i) { - page = pgdat_page_nr(pgdat, i); - total++; - if (PageHighMem(page)) - highmem++; - if (PageReserved(page)) - reserved++; - else if (PageSwapCache(page)) - cached++; - else if (page_count(page)) - shared += page_count(page) - 1; - } - pgdat_resize_unlock(pgdat, &flags); - } - printk(KERN_INFO "%d pages of RAM\n", total); - printk(KERN_INFO "%d pages of HIGHMEM\n", highmem); - printk(KERN_INFO "%d reserved pages\n", reserved); - printk(KERN_INFO "%d pages shared\n", shared); - printk(KERN_INFO "%d pages swap cached\n", cached); - - printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_FILE_DIRTY)); - printk(KERN_INFO "%lu pages writeback\n", - global_page_state(NR_WRITEBACK)); - printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED)); - printk(KERN_INFO "%lu pages slab\n", - global_page_state(NR_SLAB_RECLAIMABLE) + - global_page_state(NR_SLAB_UNRECLAIMABLE)); - printk(KERN_INFO "%lu pages pagetables\n", - global_page_state(NR_PAGETABLE)); -} - -/* - * Associate a virtual page frame with a given physical page frame - * and protection flags for that frame. - */ -static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - pgd = swapper_pg_dir + pgd_index(vaddr); - if (pgd_none(*pgd)) { - BUG(); - return; - } - pud = pud_offset(pgd, vaddr); - if (pud_none(*pud)) { - BUG(); - return; - } - pmd = pmd_offset(pud, vaddr); - if (pmd_none(*pmd)) { - BUG(); - return; - } - pte = pte_offset_kernel(pmd, vaddr); - if (pgprot_val(flags)) - /* <pfn,flags> stored as-is, to permit clearing entries */ - set_pte(pte, pfn_pte(pfn, flags)); - else - pte_clear(&init_mm, vaddr, pte); - - /* - * It's enough to flush this one mapping. - * (PGE mappings get flushed as well) - */ - __flush_tlb_one(vaddr); -} - -/* - * Associate a large virtual page frame with a given physical page frame - * and protection flags for that frame. pfn is for the base of the page, - * vaddr is what the page gets mapped to - both must be properly aligned. - * The pmd must already be instantiated. Assumes PAE mode. - */ -void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - - if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */ - printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); - return; /* BUG(); */ - } - if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ - printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); - return; /* BUG(); */ - } - pgd = swapper_pg_dir + pgd_index(vaddr); - if (pgd_none(*pgd)) { - printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); - return; /* BUG(); */ - } - pud = pud_offset(pgd, vaddr); - pmd = pmd_offset(pud, vaddr); - set_pmd(pmd, pfn_pmd(pfn, flags)); - /* - * It's enough to flush this one mapping. - * (PGE mappings get flushed as well) - */ - __flush_tlb_one(vaddr); -} - -static int fixmaps; -unsigned long __FIXADDR_TOP = 0xfffff000; -EXPORT_SYMBOL(__FIXADDR_TOP); - -void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) -{ - unsigned long address = __fix_to_virt(idx); - - if (idx >= __end_of_fixed_addresses) { - BUG(); - return; - } - set_pte_pfn(address, phys >> PAGE_SHIFT, flags); - fixmaps++; -} - -/** - * reserve_top_address - reserves a hole in the top of kernel address space - * @reserve - size of hole to reserve - * - * Can be used to relocate the fixmap area and poke a hole in the top - * of kernel address space to make room for a hypervisor. - */ -void reserve_top_address(unsigned long reserve) -{ - BUG_ON(fixmaps > 0); - printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", - (int)-reserve); - __FIXADDR_TOP = -reserve - PAGE_SIZE; - __VMALLOC_RESERVE += reserve; -} - -pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) -{ - return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); -} - -struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) -{ - struct page *pte; - -#ifdef CONFIG_HIGHPTE - pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0); -#else - pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); -#endif - return pte; -} - -void pmd_ctor(void *pmd, struct kmem_cache *cache, unsigned long flags) -{ - memset(pmd, 0, PTRS_PER_PMD*sizeof(pmd_t)); -} - -/* - * List of all pgd's needed for non-PAE so it can invalidate entries - * in both cached and uncached pgd's; not needed for PAE since the - * kernel pmd is shared. If PAE were not to share the pmd a similar - * tactic would be needed. This is essentially codepath-based locking - * against pageattr.c; it is the unique case in which a valid change - * of kernel pagetables can't be lazily synchronized by vmalloc faults. - * vmalloc faults work because attached pagetables are never freed. - * -- wli - */ -DEFINE_SPINLOCK(pgd_lock); -struct page *pgd_list; - -static inline void pgd_list_add(pgd_t *pgd) -{ - struct page *page = virt_to_page(pgd); - page->index = (unsigned long)pgd_list; - if (pgd_list) - set_page_private(pgd_list, (unsigned long)&page->index); - pgd_list = page; - set_page_private(page, (unsigned long)&pgd_list); -} - -static inline void pgd_list_del(pgd_t *pgd) -{ - struct page *next, **pprev, *page = virt_to_page(pgd); - next = (struct page *)page->index; - pprev = (struct page **)page_private(page); - *pprev = next; - if (next) - set_page_private(next, (unsigned long)pprev); -} - - - -#if (PTRS_PER_PMD == 1) -/* Non-PAE pgd constructor */ -static void pgd_ctor(void *pgd) -{ - unsigned long flags; - - /* !PAE, no pagetable sharing */ - memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); - - spin_lock_irqsave(&pgd_lock, flags); - - /* must happen under lock */ - clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, - swapper_pg_dir + USER_PTRS_PER_PGD, - KERNEL_PGD_PTRS); - paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT, - __pa(swapper_pg_dir) >> PAGE_SHIFT, - USER_PTRS_PER_PGD, - KERNEL_PGD_PTRS); - pgd_list_add(pgd); - spin_unlock_irqrestore(&pgd_lock, flags); -} -#else /* PTRS_PER_PMD > 1 */ -/* PAE pgd constructor */ -static void pgd_ctor(void *pgd) -{ - /* PAE, kernel PMD may be shared */ - - if (SHARED_KERNEL_PMD) { - clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, - swapper_pg_dir + USER_PTRS_PER_PGD, - KERNEL_PGD_PTRS); - } else { - unsigned long flags; - - memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); - spin_lock_irqsave(&pgd_lock, flags); - pgd_list_add(pgd); - spin_unlock_irqrestore(&pgd_lock, flags); - } -} -#endif /* PTRS_PER_PMD */ - -static void pgd_dtor(void *pgd) -{ - unsigned long flags; /* can be called from interrupt context */ - - if (SHARED_KERNEL_PMD) - return; - - paravirt_release_pd(__pa(pgd) >> PAGE_SHIFT); - spin_lock_irqsave(&pgd_lock, flags); - pgd_list_del(pgd); - spin_unlock_irqrestore(&pgd_lock, flags); -} - -#define UNSHARED_PTRS_PER_PGD \ - (SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD) - -/* If we allocate a pmd for part of the kernel address space, then - make sure its initialized with the appropriate kernel mappings. - Otherwise use a cached zeroed pmd. */ -static pmd_t *pmd_cache_alloc(int idx) -{ - pmd_t *pmd; - - if (idx >= USER_PTRS_PER_PGD) { - pmd = (pmd_t *)__get_free_page(GFP_KERNEL); - - if (pmd) - memcpy(pmd, - (void *)pgd_page_vaddr(swapper_pg_dir[idx]), - sizeof(pmd_t) * PTRS_PER_PMD); - } else - pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL); - - return pmd; -} - -static void pmd_cache_free(pmd_t *pmd, int idx) -{ - if (idx >= USER_PTRS_PER_PGD) - free_page((unsigned long)pmd); - else - kmem_cache_free(pmd_cache, pmd); -} - -pgd_t *pgd_alloc(struct mm_struct *mm) -{ - int i; - pgd_t *pgd = quicklist_alloc(0, GFP_KERNEL, pgd_ctor); - - if (PTRS_PER_PMD == 1 || !pgd) - return pgd; - - for (i = 0; i < UNSHARED_PTRS_PER_PGD; ++i) { - pmd_t *pmd = pmd_cache_alloc(i); - - if (!pmd) - goto out_oom; - - paravirt_alloc_pd(__pa(pmd) >> PAGE_SHIFT); - set_pgd(&pgd[i], __pgd(1 + __pa(pmd))); - } - return pgd; - -out_oom: - for (i--; i >= 0; i--) { - pgd_t pgdent = pgd[i]; - void* pmd = (void *)__va(pgd_val(pgdent)-1); - paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT); - pmd_cache_free(pmd, i); - } - quicklist_free(0, pgd_dtor, pgd); - return NULL; -} - -void pgd_free(pgd_t *pgd) -{ - int i; - - /* in the PAE case user pgd entries are overwritten before usage */ - if (PTRS_PER_PMD > 1) - for (i = 0; i < UNSHARED_PTRS_PER_PGD; ++i) { - pgd_t pgdent = pgd[i]; - void* pmd = (void *)__va(pgd_val(pgdent)-1); - paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT); - pmd_cache_free(pmd, i); - } - /* in the non-PAE case, free_pgtables() clears user pgd entries */ - quicklist_free(0, pgd_dtor, pgd); -} - -void check_pgt_cache(void) -{ - quicklist_trim(0, pgd_dtor, 25, 16); -} - |