include/asm-mips/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  */
  24 extern 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  */
  34 extern 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    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
  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 #ifdef CONFIG_HIGHMEM
  69 # define VMALLOC_END    (PKMAP_BASE-2*PAGE_SIZE)
  70 #else
  71 # define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
  72 #endif
  73
  74 #ifdef CONFIG_64BIT_PHYS_ADDR
  75 #define pte_ERROR(e) \
  76         printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
  77 #else
  78 #define pte_ERROR(e) \
  79         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  80 #endif
  81 #define pgd_ERROR(e) \
  82         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  83
  84 extern void load_pgd(unsigned long pg_dir);
  85
  86 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  87
  88 /*
  89  * Empty pgd/pmd entries point to the invalid_pte_table.
  90  */
  91 static inline int pmd_none(pmd_t pmd)
  92 {
  93         return pmd_val(pmd) == (unsigned long) invalid_pte_table;
  94 }
  95
  96 #define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
  97
  98 static inline int pmd_present(pmd_t pmd)
  99 {
 100         return pmd_val(pmd) != (unsigned long) invalid_pte_table;
 101 }
 102
 103 static inline void pmd_clear(pmd_t *pmdp)
 104 {
 105         pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
 106 }
 107
 108 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 109 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 110 #define pte_pfn(x)              ((unsigned long)((x).pte_high >> 6))
 111 static inline pte_t
 112 pfn_pte(unsigned long pfn, pgprot_t prot)
 113 {
 114         pte_t pte;
 115         pte.pte_high = (pfn << 6) | (pgprot_val(prot) & 0x3f);
 116         pte.pte_low = pgprot_val(prot);
 117         return pte;
 118 }
 119
 120 #else
 121
 122 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 123
 124 #ifdef CONFIG_CPU_VR41XX
 125 #define pte_pfn(x)              ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
 126 #define pfn_pte(pfn, prot)      __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
 127 #else
 128 #define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
 129 #define pfn_pte(pfn, prot)      __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 130 #endif
 131 #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) */
 132
 133 #define __pgd_offset(address)   pgd_index(address)
 134 #define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 135 #define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 136
 137 /* to find an entry in a kernel page-table-directory */
 138 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 139
 140 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 141
 142 /* to find an entry in a page-table-directory */
 143 #define pgd_offset(mm,addr)     ((mm)->pgd + pgd_index(addr))
 144
 145 /* Find an entry in the third-level page table.. */
 146 #define __pte_offset(address)                                           \
 147         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 148 #define pte_offset(dir, address)                                        \
 149         ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
 150 #define pte_offset_kernel(dir, address)                                 \
 151         ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
 152
 153 #define pte_offset_map(dir, address)                                    \
 154         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 155 #define pte_offset_map_nested(dir, address)                             \
 156         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 157 #define pte_unmap(pte) ((void)(pte))
 158 #define pte_unmap_nested(pte) ((void)(pte))
 159
 160 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 161
 162 /* Swap entries must have VALID bit cleared. */
 163 #define __swp_type(x)           (((x).val >> 10) & 0x1f)
 164 #define __swp_offset(x)         ((x).val >> 15)
 165 #define __swp_entry(type,offset)        \
 166         ((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
 167
 168 /*
 169  * Bits 0, 4, 8, and 9 are taken, split up 28 bits of offset into this range:
 170  */
 171 #define PTE_FILE_MAX_BITS       28
 172
 173 #define pte_to_pgoff(_pte)      ((((_pte).pte >> 1 ) & 0x07) | \
 174                                  (((_pte).pte >> 2 ) & 0x38) | \
 175                                  (((_pte).pte >> 10) <<  6 ))
 176
 177 #define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x07) << 1 ) | \
 178                                            (((off) & 0x38) << 2 ) | \
 179                                            (((off) >>  6 ) << 10) | \
 180                                            _PAGE_FILE })
 181
 182 #else
 183
 184 /* Swap entries must have VALID and GLOBAL bits cleared. */
 185 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 186 #define __swp_type(x)           (((x).val >> 2) & 0x1f)
 187 #define __swp_offset(x)          ((x).val >> 7)
 188 #define __swp_entry(type,offset)        \
 189                 ((swp_entry_t)  { ((type) << 2) | ((offset) << 7) })
 190 #else
 191 #define __swp_type(x)           (((x).val >> 8) & 0x1f)
 192 #define __swp_offset(x)          ((x).val >> 13)
 193 #define __swp_entry(type,offset)        \
 194                 ((swp_entry_t)  { ((type) << 8) | ((offset) << 13) })
 195 #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
 196
 197 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 198 /*
 199  * Bits 0 and 1 of pte_high are taken, use the rest for the page offset...
 200  */
 201 #define PTE_FILE_MAX_BITS       30
 202
 203 #define pte_to_pgoff(_pte)      ((_pte).pte_high >> 2)
 204 #define pgoff_to_pte(off)       ((pte_t) { _PAGE_FILE, (off) << 2 })
 205
 206 #else
 207 /*
 208  * Bits 0, 4, 6, and 7 are taken, split up 28 bits of offset into this range:
 209  */
 210 #define PTE_FILE_MAX_BITS       28
 211
 212 #define pte_to_pgoff(_pte)      ((((_pte).pte >> 1) & 0x7) | \
 213                                  (((_pte).pte >> 2) & 0x8) | \
 214                                  (((_pte).pte >> 8) <<  4))
 215
 216 #define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x7) << 1) | \
 217                                            (((off) & 0x8) << 2) | \
 218                                            (((off) >>  4) << 8) | \
 219                                            _PAGE_FILE })
 220 #endif
 221
 222 #endif
 223
 224 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 225 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high })
 226 #define __swp_entry_to_pte(x)   ((pte_t) { 0, (x).val })
 227 #else
 228 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 229 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 230 #endif
 231
 232 #endif /* _ASM_PGTABLE_32_H */