/* MN10300 Memory management initialisation * * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Modified by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #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/slab.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/initrd.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/bootmem.h> #include <asm/processor.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/dma.h> #include <asm/tlb.h> #include <asm/sections.h> DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); unsigned long highstart_pfn, highend_pfn; /* * set up paging */ void __init paging_init(void) { unsigned long zones_size[MAX_NR_ZONES] = {0,}; pte_t *ppte; int loop; /* main kernel space -> RAM mapping is handled as 1:1 transparent by * the MMU */ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes)); /* load the VMALLOC area PTE table addresses into the kernel PGD */ ppte = kernel_vmalloc_ptes; for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE); loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE); loop++ ) { set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE)); ppte += PAGE_SIZE / sizeof(pte_t); } /* declare the sizes of the RAM zones (only use the normal zone) */ zones_size[ZONE_NORMAL] = (contig_page_data.bdata->node_low_pfn) - (contig_page_data.bdata->node_boot_start >> PAGE_SHIFT); /* pass the memory from the bootmem allocator to the main allocator */ free_area_init(zones_size); __flush_tlb_all(); } /* * transfer all the memory from the bootmem allocator to the runtime allocator */ void __init mem_init(void) { int codesize, reservedpages, datasize, initsize; int tmp; if (!mem_map) BUG(); #define START_PFN (contig_page_data.bdata->node_boot_start >> PAGE_SHIFT) #define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn) max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN; high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE); /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); /* this will put all low memory onto the freelists */ totalram_pages += free_all_bootmem(); reservedpages = 0; for (tmp = 0; tmp < num_physpages; tmp++) if (PageReserved(&mem_map[tmp])) reservedpages++; codesize = (unsigned long) &_etext - (unsigned long) &_stext; datasize = (unsigned long) &_edata - (unsigned long) &_etext; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 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), max_mapnr << (PAGE_SHIFT - 10), codesize >> 10, reservedpages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10, (unsigned long) (totalhigh_pages << (PAGE_SHIFT - 10)) ); } /* * */ 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, 0xcc, PAGE_SIZE); free_page(addr); totalram_pages++; } printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); } /* * recycle memory containing stuff only required for initialisation */ void free_initmem(void) { free_init_pages("unused kernel memory", (unsigned long) &__init_begin, (unsigned long) &__init_end); } /* * dispose of the memory on which the initial ramdisk resided */ #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { free_init_pages("initrd memory", start, end); } #endif