#include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/nmi.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(); for_each_online_pgdat(pgdat) { pgdat_resize_lock(pgdat, &flags); for (i = 0; i < pgdat->node_spanned_pages; ++i) { if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) touch_nmi_watchdog(); 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. */ void set_pte_vaddr(unsigned long vaddr, pte_t pteval) { 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 (pte_val(pteval)) set_pte_present(&init_mm, vaddr, pte, pteval); 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); } unsigned long __FIXADDR_TOP = 0xfffff000; EXPORT_SYMBOL(__FIXADDR_TOP); /** * 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 __init reserve_top_address(unsigned long reserve) { BUG_ON(fixmaps_set > 0); printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", (int)-reserve); __FIXADDR_TOP = -reserve - PAGE_SIZE; __VMALLOC_RESERVE += reserve; } /* * vmalloc=size forces the vmalloc area to be exactly 'size' * bytes. This can be used to increase (or decrease) the * vmalloc area - the default is 128m. */ static int __init parse_vmalloc(char *arg) { if (!arg) return -EINVAL; __VMALLOC_RESERVE = memparse(arg, &arg); return 0; } early_param("vmalloc", parse_vmalloc); /* * reservetop=size reserves a hole at the top of the kernel address space which * a hypervisor can load into later. Needed for dynamically loaded hypervisors, * so relocating the fixmap can be done before paging initialization. */ static int __init parse_reservetop(char *arg) { unsigned long address; if (!arg) return -EINVAL; address = memparse(arg, &arg); reserve_top_address(address); return 0; } early_param("reservetop", parse_reservetop);