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 #ifdef CONFIG_64BIT_PHYS_ADDR
  47 #define PGDIR_SHIFT     21
  48 #else
  49 #define PGDIR_SHIFT     22
  50 #endif
  51 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  52 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  53
  54 /*
  55  * Entries per page directory level: we use two-level, so
  56  * we don't really have any PUD/PMD directory physically.
  57  */
  58 #ifdef CONFIG_64BIT_PHYS_ADDR
  59 #define PGD_ORDER       1
  60 #define PUD_ORDER       aieeee_attempt_to_allocate_pud
  61 #define PMD_ORDER       1
  62 #define PTE_ORDER       0
  63 #else
  64 #define PGD_ORDER       0
  65 #define PUD_ORDER       aieeee_attempt_to_allocate_pud
  66 #define PMD_ORDER       1
  67 #define PTE_ORDER       0
  68 #endif
  69
  70 #define PTRS_PER_PGD    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
  71 #define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
  72
  73 #define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  74 #define FIRST_USER_ADDRESS      0
  75
  76 #define VMALLOC_START     MAP_BASE
  77
  78 #ifdef CONFIG_HIGHMEM
  79 # define VMALLOC_END    (PKMAP_BASE-2*PAGE_SIZE)
  80 #else
  81 # define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
  82 #endif
  83
  84 #ifdef CONFIG_64BIT_PHYS_ADDR
  85 #define pte_ERROR(e) \
  86         printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
  87 #else
  88 #define pte_ERROR(e) \
  89         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  90 #endif
  91 #define pgd_ERROR(e) \
  92         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  93
  94 extern void load_pgd(unsigned long pg_dir);
  95
  96 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  97
  98 /*
  99  * Empty pgd/pmd entries point to the invalid_pte_table.
 100  */
 101 static inline int pmd_none(pmd_t pmd)
 102 {
 103         return pmd_val(pmd) == (unsigned long) invalid_pte_table;
 104 }
 105
 106 #define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
 107
 108 static inline int pmd_present(pmd_t pmd)
 109 {
 110         return pmd_val(pmd) != (unsigned long) invalid_pte_table;
 111 }
 112
 113 static inline void pmd_clear(pmd_t *pmdp)
 114 {
 115         pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
 116 }
 117
 118 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 119 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 120 #define pte_pfn(x)              ((unsigned long)((x).pte_high >> 6))
 121 static inline pte_t
 122 pfn_pte(unsigned long pfn, pgprot_t prot)
 123 {
 124         pte_t pte;
 125         pte.pte_high = (pfn << 6) | (pgprot_val(prot) & 0x3f);
 126         pte.pte_low = pgprot_val(prot);
 127         return pte;
 128 }
 129
 130 #else
 131
 132 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 133
 134 #ifdef CONFIG_CPU_VR41XX
 135 #define pte_pfn(x)              ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
 136 #define pfn_pte(pfn, prot)      __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
 137 #else
 138 #define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
 139 #define pfn_pte(pfn, prot)      __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 140 #endif
 141 #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) */
 142
 143 #define __pgd_offset(address)   pgd_index(address)
 144 #define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 145 #define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 146
 147 /* to find an entry in a kernel page-table-directory */
 148 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 149
 150 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 151
 152 /* to find an entry in a page-table-directory */
 153 #define pgd_offset(mm,addr)     ((mm)->pgd + pgd_index(addr))
 154
 155 /* Find an entry in the third-level page table.. */
 156 #define __pte_offset(address)                                           \
 157         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 158 #define pte_offset(dir, address)                                        \
 159         ((pte_t *) (pmd_page_kernel(*dir)) + __pte_offset(address))
 160 #define pte_offset_kernel(dir, address) \
 161         ((pte_t *) pmd_page_kernel(*(dir)) +  __pte_offset(address))
 162
 163 #define pte_offset_map(dir, address)                                    \
 164         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 165 #define pte_offset_map_nested(dir, address)                             \
 166         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 167 #define pte_unmap(pte) ((void)(pte))
 168 #define pte_unmap_nested(pte) ((void)(pte))
 169
 170 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 171
 172 /* Swap entries must have VALID bit cleared. */
 173 #define __swp_type(x)           (((x).val >> 10) & 0x1f)
 174 #define __swp_offset(x)         ((x).val >> 15)
 175 #define __swp_entry(type,offset)        \
 176         ((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
 177
 178 /*
 179  * Bits 0, 4, 8, and 9 are taken, split up 28 bits of offset into this range:
 180  */
 181 #define PTE_FILE_MAX_BITS       28
 182
 183 #define pte_to_pgoff(_pte)      ((((_pte).pte >> 1 ) & 0x07) | \
 184                                  (((_pte).pte >> 2 ) & 0x38) | \
 185                                  (((_pte).pte >> 10) <<  6 ))
 186
 187 #define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x07) << 1 ) | \
 188                                            (((off) & 0x38) << 2 ) | \
 189                                            (((off) >>  6 ) << 10) | \
 190                                            _PAGE_FILE })
 191
 192 #else
 193
 194 /* Swap entries must have VALID and GLOBAL bits cleared. */
 195 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 196 #define __swp_type(x)           (((x).val >> 2) & 0x1f)
 197 #define __swp_offset(x)          ((x).val >> 7)
 198 #define __swp_entry(type,offset)        \
 199                 ((swp_entry_t)  { ((type) << 2) | ((offset) << 7) })
 200 #else
 201 #define __swp_type(x)           (((x).val >> 8) & 0x1f)
 202 #define __swp_offset(x)          ((x).val >> 13)
 203 #define __swp_entry(type,offset)        \
 204                 ((swp_entry_t)  { ((type) << 8) | ((offset) << 13) })
 205 #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
 206
 207 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 208 /*
 209  * Bits 0 and 1 of pte_high are taken, use the rest for the page offset...
 210  */
 211 #define PTE_FILE_MAX_BITS       30
 212
 213 #define pte_to_pgoff(_pte)      ((_pte).pte_high >> 2)
 214 #define pgoff_to_pte(off)       ((pte_t) { _PAGE_FILE, (off) << 2 })
 215
 216 #else
 217 /*
 218  * Bits 0, 4, 6, and 7 are taken, split up 28 bits of offset into this range:
 219  */
 220 #define PTE_FILE_MAX_BITS       28
 221
 222 #define pte_to_pgoff(_pte)      ((((_pte).pte >> 1) & 0x7) | \
 223                                  (((_pte).pte >> 2) & 0x8) | \
 224                                  (((_pte).pte >> 8) <<  4))
 225
 226 #define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x7) << 1) | \
 227                                            (((off) & 0x8) << 2) | \
 228                                            (((off) >>  4) << 8) | \
 229                                            _PAGE_FILE })
 230 #endif
 231
 232 #endif
 233
 234 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 235 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high })
 236 #define __swp_entry_to_pte(x)   ((pte_t) { 0, (x).val })
 237 #else
 238 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 239 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 240 #endif
 241
 242 #endif /* _ASM_PGTABLE_32_H */