release/src-rt-6.x.4708/linux/linux-2.6.36/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  */
  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    (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
  86 extern void load_pgd(unsigned long pg_dir);
  87
  88 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  89
  90 /*
  91  * Empty pgd/pmd entries point to the invalid_pte_table.
  92  */
  93 static 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
 100 static inline int pmd_present(pmd_t pmd)
 101 {
 102         return pmd_val(pmd) != (unsigned long) invalid_pte_table;
 103 }
 104
 105 static 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))
 113 static inline pte_t
 114 pfn_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 >> _PFN_SHIFT))
 131 #define pfn_pte(pfn, prot)      __pte(((unsigned long long)(pfn) << _PFN_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 */