LXR linux/arch/mips/include/asm/pgtable-32.h

   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) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
   7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8 */
   9#ifndef _ASM_PGTABLE_32_H
  10#define _ASM_PGTABLE_32_H
  11
  12#include <asm/addrspace.h>
  13#include <asm/page.h>
  14
  15#include <linux/linkage.h>
  16#include <asm/cachectl.h>
  17#include <asm/fixmap.h>
  18
  19#include <asm-generic/pgtable-nopmd.h>
  20
  21/*
  22 * - add_wired_entry() add a fixed TLB entry, and move wired register
  23 */
  24extern void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
  25                               unsigned long entryhi, unsigned long pagemask);
  26
  27/*
  28 * - add_temporary_entry() add a temporary TLB entry. We use TLB entries
  29 *      starting at the top and working down. This is for populating the
  30 *      TLB before trap_init() puts the TLB miss handler in place. It
  31 *      should be used only for entries matching the actual page tables,
  32 *      to prevent inconsistencies.
  33 */
  34extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
  35                               unsigned long entryhi, unsigned long pagemask);
  36
  37
  38/* Basically we have the same two-level (which is the logical three level
  39 * Linux page table layout folded) page tables as the i386.  Some day
  40 * when we have proper page coloring support we can have a 1% quicker
  41 * tlb refill handling mechanism, but for now it is a bit slower but
  42 * works even with the cache aliasing problem the R4k and above have.
  43 */
  44
  45/* PGDIR_SHIFT determines what a third-level page table entry can map */
  46#define PGDIR_SHIFT     (2 * PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2)
  47#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  48#define PGDIR_MASK      (~(PGDIR_SIZE-1))
  49
  50/*
  51 * Entries per page directory level: we use two-level, so
  52 * we don't really have any PUD/PMD directory physically.
  53 */
  54#define __PGD_ORDER     (32 - 3 * PAGE_SHIFT + PGD_T_LOG2 + PTE_T_LOG2)
  55#define PGD_ORDER       (__PGD_ORDER >= 0 ? __PGD_ORDER : 0)
  56#define PUD_ORDER       aieeee_attempt_to_allocate_pud
  57#define PMD_ORDER       1
  58#define PTE_ORDER       0
  59
  60#define PTRS_PER_PGD    (USER_PTRS_PER_PGD * 2)
  61#define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
  62
  63#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  64#define FIRST_USER_ADDRESS      0
  65
  66#define VMALLOC_START     MAP_BASE
  67
  68#define PKMAP_BASE              (0xfe000000UL)
  69
  70#ifdef CONFIG_HIGHMEM
  71# define VMALLOC_END    (PKMAP_BASE-2*PAGE_SIZE)
  72#else
  73# define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
  74#endif
  75
  76#ifdef CONFIG_64BIT_PHYS_ADDR
  77#define pte_ERROR(e) \
  78        printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
  79#else
  80#define pte_ERROR(e) \
  81        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  82#endif
  83#define pgd_ERROR(e) \
  84        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  85
  86extern void load_pgd(unsigned long pg_dir);
  87
  88extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  89
  90/*
  91 * Empty pgd/pmd entries point to the invalid_pte_table.
  92 */
  93static inline int pmd_none(pmd_t pmd)
  94{
  95        return pmd_val(pmd) == (unsigned long) invalid_pte_table;
  96}
  97
  98#define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
  99
 100static inline int pmd_present(pmd_t pmd)
 101{
 102        return pmd_val(pmd) != (unsigned long) invalid_pte_table;
 103}
 104
 105static inline void pmd_clear(pmd_t *pmdp)
 106{
 107        pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
 108}
 109
 110#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 111#define pte_page(x)             pfn_to_page(pte_pfn(x))
 112#define pte_pfn(x)              ((unsigned long)((x).pte_high >> 6))
 113static inline pte_t
 114pfn_pte(unsigned long pfn, pgprot_t prot)
 115{
 116        pte_t pte;
 117        pte.pte_high = (pfn << 6) | (pgprot_val(prot) & 0x3f);
 118        pte.pte_low = pgprot_val(prot);
 119        return pte;
 120}
 121
 122#else
 123
 124#define pte_page(x)             pfn_to_page(pte_pfn(x))
 125
 126#ifdef CONFIG_CPU_VR41XX
 127#define pte_pfn(x)              ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
 128#define pfn_pte(pfn, prot)      __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
 129#else
 130#define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
 131#define pfn_pte(pfn, prot)      __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 132#endif
 133#endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
 134
 135#define __pgd_offset(address)   pgd_index(address)
 136#define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 137#define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 138
 139/* to find an entry in a kernel page-table-directory */
 140#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 141
 142#define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 143
 144/* to find an entry in a page-table-directory */
 145#define pgd_offset(mm, addr)    ((mm)->pgd + pgd_index(addr))
 146
 147/* Find an entry in the third-level page table.. */
 148#define __pte_offset(address)                                           \
 149        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 150#define pte_offset(dir, address)                                        \
 151        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
 152#define pte_offset_kernel(dir, address)                                 \
 153        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
 154
 155#define pte_offset_map(dir, address)                                    \
 156        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 157#define pte_offset_map_nested(dir, address)                             \
 158        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 159#define pte_unmap(pte) ((void)(pte))
 160#define pte_unmap_nested(pte) ((void)(pte))
 161
 162#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 163
 164/* Swap entries must have VALID bit cleared. */
 165#define __swp_type(x)           (((x).val >> 10) & 0x1f)
 166#define __swp_offset(x)         ((x).val >> 15)
 167#define __swp_entry(type,offset)        \
 168        ((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
 169
 170/*
 171 * Bits 0, 4, 8, and 9 are taken, split up 28 bits of offset into this range:
 172 */
 173#define PTE_FILE_MAX_BITS       28
 174
 175#define pte_to_pgoff(_pte)      ((((_pte).pte >> 1 ) & 0x07) | \
 176                                 (((_pte).pte >> 2 ) & 0x38) | \
 177                                 (((_pte).pte >> 10) <<  6 ))
 178
 179#define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x07) << 1 ) | \
 180                                           (((off) & 0x38) << 2 ) | \
 181                                           (((off) >>  6 ) << 10) | \
 182                                           _PAGE_FILE })
 183
 184#else
 185
 186/* Swap entries must have VALID and GLOBAL bits cleared. */
 187#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 188#define __swp_type(x)           (((x).val >> 2) & 0x1f)
 189#define __swp_offset(x)          ((x).val >> 7)
 190#define __swp_entry(type,offset)        \
 191                ((swp_entry_t)  { ((type) << 2) | ((offset) << 7) })
 192#else
 193#define __swp_type(x)           (((x).val >> 8) & 0x1f)
 194#define __swp_offset(x)          ((x).val >> 13)
 195#define __swp_entry(type,offset)        \
 196                ((swp_entry_t)  { ((type) << 8) | ((offset) << 13) })
 197#endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
 198
 199#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 200/*
 201 * Bits 0 and 1 of pte_high are taken, use the rest for the page offset...
 202 */
 203#define PTE_FILE_MAX_BITS       30
 204
 205#define pte_to_pgoff(_pte)      ((_pte).pte_high >> 2)
 206#define pgoff_to_pte(off)       ((pte_t) { _PAGE_FILE, (off) << 2 })
 207
 208#else
 209/*
 210 * Bits 0, 4, 6, and 7 are taken, split up 28 bits of offset into this range:
 211 */
 212#define PTE_FILE_MAX_BITS       28
 213
 214#define pte_to_pgoff(_pte)      ((((_pte).pte >> 1) & 0x7) | \
 215                                 (((_pte).pte >> 2) & 0x8) | \
 216                                 (((_pte).pte >> 8) <<  4))
 217
 218#define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x7) << 1) | \
 219                                           (((off) & 0x8) << 2) | \
 220                                           (((off) >>  4) << 8) | \
 221                                           _PAGE_FILE })
 222#endif
 223
 224#endif
 225
 226#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 227#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high })
 228#define __swp_entry_to_pte(x)   ((pte_t) { 0, (x).val })
 229#else
 230#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 231#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 232#endif
 233
 234#endif /* _ASM_PGTABLE_32_H */
 235