322 lines
8.3 KiB
C
322 lines
8.3 KiB
C
/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
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*
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* linux/arch/sh/mm/init.c
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002, 2004 Paul Mundt
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*
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/bootmem.h>
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#include <linux/pagemap.h>
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#include <linux/proc_fs.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/tlb.h>
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#include <asm/cacheflush.h>
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#include <asm/cache.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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pgd_t swapper_pg_dir[PTRS_PER_PGD];
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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 = NO_CONTEXT;
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#ifdef CONFIG_MMU
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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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#endif
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void (*copy_page)(void *from, void *to);
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void (*clear_page)(void *to);
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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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}
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static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pgd = swapper_pg_dir + pgd_index(addr);
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if (pgd_none(*pgd)) {
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pgd_ERROR(*pgd);
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return;
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}
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pud = pud_offset(pgd, addr);
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if (pud_none(*pud)) {
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pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
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set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
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if (pmd != pmd_offset(pud, 0)) {
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pud_ERROR(*pud);
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return;
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}
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}
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pmd = pmd_offset(pud, addr);
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if (pmd_none(*pmd)) {
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pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
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set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
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if (pte != pte_offset_kernel(pmd, 0)) {
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pmd_ERROR(*pmd);
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return;
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}
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}
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pte = pte_offset_kernel(pmd, addr);
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if (!pte_none(*pte)) {
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pte_ERROR(*pte);
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return;
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}
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
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__flush_tlb_page(get_asid(), addr);
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}
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/*
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* As a performance optimization, other platforms preserve the fixmap mapping
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* across a context switch, we don't presently do this, but this could be done
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* in a similar fashion as to the wired TLB interface that sh64 uses (by way
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* of the memorry mapped UTLB configuration) -- this unfortunately forces us to
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* give up a TLB entry for each mapping we want to preserve. While this may be
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* viable for a small number of fixmaps, it's not particularly useful for
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* everything and needs to be carefully evaluated. (ie, we may want this for
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* the vsyscall page).
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*
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* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
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* in at __set_fixmap() time to determine the appropriate behavior to follow.
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*
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* -- PFM.
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*/
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void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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set_pte_phys(address, phys, prot);
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}
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/* References to section boundaries */
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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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/*
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* paging_init() sets up the page tables
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*
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* This routines also unmaps the page at virtual kernel address 0, so
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* that we can trap those pesky NULL-reference errors in the kernel.
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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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/*
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* Setup some defaults for the zone sizes.. these should be safe
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* regardless of distcontiguous memory or MMU settings.
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*/
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zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
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zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
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#ifdef CONFIG_HIGHMEM
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zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
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#endif
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#ifdef CONFIG_MMU
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/*
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* If we have an MMU, and want to be using it .. we need to adjust
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* the zone sizes accordingly, in addition to turning it on.
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*/
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{
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unsigned long max_dma, low, start_pfn;
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pgd_t *pg_dir;
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int i;
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/* We don't need kernel mapping as hardware support that. */
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pg_dir = swapper_pg_dir;
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for (i = 0; i < PTRS_PER_PGD; i++)
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pgd_val(pg_dir[i]) = 0;
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/* Turn on the MMU */
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enable_mmu();
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/* Fixup the zone sizes */
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start_pfn = START_PFN;
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max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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low = MAX_LOW_PFN;
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if (low < max_dma) {
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zones_size[ZONE_DMA] = low - start_pfn;
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zones_size[ZONE_NORMAL] = 0;
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} else {
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zones_size[ZONE_DMA] = max_dma - start_pfn;
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zones_size[ZONE_NORMAL] = low - max_dma;
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}
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}
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#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
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/*
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* If we don't have CONFIG_MMU set and the processor in question
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* still has an MMU, care needs to be taken to make sure it doesn't
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* stay on.. Since the boot loader could have potentially already
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* turned it on, and we clearly don't want it, we simply turn it off.
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*
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* We don't need to do anything special for the zone sizes, since the
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* default values that were already configured up above should be
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* satisfactory.
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*/
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disable_mmu();
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#endif
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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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static struct kcore_list kcore_mem, kcore_vmalloc;
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void __init mem_init(void)
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{
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extern unsigned long empty_zero_page[1024];
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int codesize, reservedpages, datasize, initsize;
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int tmp;
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extern unsigned long memory_start;
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#ifdef CONFIG_MMU
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high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
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#else
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extern unsigned long memory_end;
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high_memory = (void *)(memory_end & PAGE_MASK);
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#endif
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max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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__flush_wback_region(empty_zero_page, PAGE_SIZE);
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/*
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* Setup wrappers for copy/clear_page(), these will get overridden
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* later in the boot process if a better method is available.
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*/
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#ifdef CONFIG_MMU
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copy_page = copy_page_slow;
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clear_page = clear_page_slow;
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#else
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copy_page = copy_page_nommu;
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clear_page = clear_page_nommu;
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#endif
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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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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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kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
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kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
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VMALLOC_END - VMALLOC_START);
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printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
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"%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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p3_cache_init();
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/* Initialize the vDSO */
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vsyscall_init();
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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: %dk 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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