194 lines
5.4 KiB
C
194 lines
5.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* arch/sh64/mm/init.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003, 2004 Paul Mundt
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*
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*/
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#include <linux/init.h>
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#include <linux/rwsem.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/bootmem.h>
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#include <asm/mmu_context.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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#ifdef CONFIG_BLK_DEV_INITRD
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#include <linux/blk.h>
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#endif
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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/*
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* Cache of MMU context last used.
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*/
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unsigned long mmu_context_cache;
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pgd_t * mmu_pdtp_cache;
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int after_bootmem = 0;
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/*
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* BAD_PAGE is the page that is used for page faults when linux
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* is out-of-memory. Older versions of linux just did a
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* do_exit(), but using this instead means there is less risk
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* for a process dying in kernel mode, possibly leaving an inode
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* unused etc..
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*
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* BAD_PAGETABLE is the accompanying page-table: it is initialized
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* to point to BAD_PAGE entries.
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*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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extern unsigned char empty_zero_page[PAGE_SIZE];
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extern unsigned char empty_bad_page[PAGE_SIZE];
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extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern char _text, _etext, _edata, __bss_start, _end;
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extern char __init_begin, __init_end;
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/* It'd be good if these lines were in the standard header file. */
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#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
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#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
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void show_mem(void)
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{
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int i, total = 0, reserved = 0;
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int shared = 0, cached = 0;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
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i = max_mapnr;
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while (i-- > 0) {
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total++;
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if (PageReserved(mem_map+i))
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reserved++;
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else if (PageSwapCache(mem_map+i))
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cached++;
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else if (page_count(mem_map+i))
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shared += page_count(mem_map+i) - 1;
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}
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printk("%d pages of RAM\n",total);
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printk("%d reserved pages\n",reserved);
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printk("%d pages shared\n",shared);
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printk("%d pages swap cached\n",cached);
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printk("%ld pages in page table cache\n", quicklist_total_size());
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}
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/*
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* paging_init() sets up the page tables.
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*
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* head.S already did a lot to set up address translation for the kernel.
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* Here we comes with:
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* . MMU enabled
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* . ASID set (SR)
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* . some 512MB regions being mapped of which the most relevant here is:
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* . CACHED segment (ASID 0 [irrelevant], shared AND NOT user)
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* . possible variable length regions being mapped as:
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* . UNCACHED segment (ASID 0 [irrelevant], shared AND NOT user)
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* . All of the memory regions are placed, independently from the platform
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* on high addresses, above 0x80000000.
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* . swapper_pg_dir is already cleared out by the .space directive
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* in any case swapper does not require a real page directory since
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* it's all kernel contained.
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*
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* Those pesky NULL-reference errors in the kernel are then
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* dealt with by not mapping address 0x00000000 at all.
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*
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*/
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void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0, };
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pgd_init((unsigned long)swapper_pg_dir);
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pgd_init((unsigned long)swapper_pg_dir +
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sizeof(pgd_t) * USER_PTRS_PER_PGD);
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mmu_context_cache = MMU_CONTEXT_FIRST_VERSION;
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zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
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NODE_DATA(0)->node_mem_map = NULL;
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free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
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}
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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int tmp;
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max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
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high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
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/*
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* Clear the zero-page.
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* This is not required but we might want to re-use
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* this very page to pass boot parameters, one day.
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*/
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memset(empty_zero_page, 0, PAGE_SIZE);
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/* this will put all low memory onto the freelists */
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totalram_pages += free_all_bootmem_node(NODE_DATA(0));
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reservedpages = 0;
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for (tmp = 0; tmp < num_physpages; tmp++)
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/*
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* Only count reserved RAM pages
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*/
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if (PageReserved(mem_map+tmp))
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reservedpages++;
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after_bootmem = 1;
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codesize = (unsigned long) &_etext - (unsigned long) &_text;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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max_mapnr << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >> 10,
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initsize >> 10);
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}
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk ("Freeing unused kernel memory: %ldk freed\n", (&__init_end - &__init_begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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unsigned long p;
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for (p = start; p < end; p += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(p));
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init_page_count(virt_to_page(p));
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free_page(p);
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totalram_pages++;
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}
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printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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}
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#endif
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