LXR linux/arch/mips/mm/pgtable-32.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2003 by Ralf Baechle
   7 */
   8#include <linux/init.h>
   9#include <linux/mm.h>
  10#include <linux/memblock.h>
  11#include <linux/highmem.h>
  12#include <asm/fixmap.h>
  13#include <asm/pgalloc.h>
  14#include <asm/tlbflush.h>
  15
  16void pgd_init(unsigned long page)
  17{
  18        unsigned long *p = (unsigned long *) page;
  19        int i;
  20
  21        for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
  22                p[i + 0] = (unsigned long) invalid_pte_table;
  23                p[i + 1] = (unsigned long) invalid_pte_table;
  24                p[i + 2] = (unsigned long) invalid_pte_table;
  25                p[i + 3] = (unsigned long) invalid_pte_table;
  26                p[i + 4] = (unsigned long) invalid_pte_table;
  27                p[i + 5] = (unsigned long) invalid_pte_table;
  28                p[i + 6] = (unsigned long) invalid_pte_table;
  29                p[i + 7] = (unsigned long) invalid_pte_table;
  30        }
  31}
  32
  33#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
  34pmd_t mk_pmd(struct page *page, pgprot_t prot)
  35{
  36        pmd_t pmd;
  37
  38        pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
  39
  40        return pmd;
  41}
  42
  43
  44void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  45                pmd_t *pmdp, pmd_t pmd)
  46{
  47        *pmdp = pmd;
  48        flush_tlb_all();
  49}
  50#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
  51
  52void __init pagetable_init(void)
  53{
  54        unsigned long vaddr;
  55        pgd_t *pgd_base;
  56#ifdef CONFIG_HIGHMEM
  57        pgd_t *pgd;
  58        p4d_t *p4d;
  59        pud_t *pud;
  60        pmd_t *pmd;
  61        pte_t *pte;
  62#endif
  63
  64        /* Initialize the entire pgd.  */
  65        pgd_init((unsigned long)swapper_pg_dir);
  66        pgd_init((unsigned long)swapper_pg_dir
  67                 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  68
  69        pgd_base = swapper_pg_dir;
  70
  71        /*
  72         * Fixed mappings:
  73         */
  74        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
  75        fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
  76
  77#ifdef CONFIG_HIGHMEM
  78        /*
  79         * Permanent kmaps:
  80         */
  81        vaddr = PKMAP_BASE;
  82        fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
  83
  84        pgd = swapper_pg_dir + pgd_index(vaddr);
  85        p4d = p4d_offset(pgd, vaddr);
  86        pud = pud_offset(p4d, vaddr);
  87        pmd = pmd_offset(pud, vaddr);
  88        pte = pte_offset_kernel(pmd, vaddr);
  89        pkmap_page_table = pte;
  90#endif
  91}
  92