Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _MOTOROLA_PGTABLE_H |
| 2 | #define _MOTOROLA_PGTABLE_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
| 5 | /* |
| 6 | * Definitions for MMU descriptors |
| 7 | */ |
| 8 | #define _PAGE_PRESENT 0x001 |
| 9 | #define _PAGE_SHORT 0x002 |
| 10 | #define _PAGE_RONLY 0x004 |
| 11 | #define _PAGE_ACCESSED 0x008 |
| 12 | #define _PAGE_DIRTY 0x010 |
| 13 | #define _PAGE_SUPER 0x080 /* 68040 supervisor only */ |
| 14 | #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ |
| 15 | #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ |
| 16 | #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ |
| 17 | #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ |
| 18 | #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ |
| 19 | #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ |
| 20 | |
| 21 | #define _DESCTYPE_MASK 0x003 |
| 22 | |
| 23 | #define _CACHEMASK040 (~0x060) |
| 24 | #define _TABLE_MASK (0xfffffe00) |
| 25 | |
| 26 | #define _PAGE_TABLE (_PAGE_SHORT) |
| 27 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) |
| 28 | |
| 29 | #define _PAGE_PROTNONE 0x004 |
| 30 | #define _PAGE_FILE 0x008 /* pagecache or swap? */ |
| 31 | |
| 32 | #ifndef __ASSEMBLY__ |
| 33 | |
| 34 | /* This is the cache mode to be used for pages containing page descriptors for |
| 35 | * processors >= '040. It is in pte_mknocache(), and the variable is defined |
| 36 | * and initialized in head.S */ |
| 37 | extern int m68k_pgtable_cachemode; |
| 38 | |
| 39 | /* This is the cache mode for normal pages, for supervisor access on |
| 40 | * processors >= '040. It is used in pte_mkcache(), and the variable is |
| 41 | * defined and initialized in head.S */ |
| 42 | |
| 43 | #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH) |
| 44 | #define m68k_supervisor_cachemode _PAGE_CACHE040W |
| 45 | #elif defined(CPU_M68040_OR_M68060_ONLY) |
| 46 | #define m68k_supervisor_cachemode _PAGE_CACHE040 |
| 47 | #elif defined(CPU_M68020_OR_M68030_ONLY) |
| 48 | #define m68k_supervisor_cachemode 0 |
| 49 | #else |
| 50 | extern int m68k_supervisor_cachemode; |
| 51 | #endif |
| 52 | |
| 53 | #if defined(CPU_M68040_OR_M68060_ONLY) |
| 54 | #define mm_cachebits _PAGE_CACHE040 |
| 55 | #elif defined(CPU_M68020_OR_M68030_ONLY) |
| 56 | #define mm_cachebits 0 |
| 57 | #else |
| 58 | extern unsigned long mm_cachebits; |
| 59 | #endif |
| 60 | |
| 61 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits) |
| 62 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) |
| 63 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) |
| 64 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) |
| 65 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) |
| 66 | |
| 67 | /* Alternate definitions that are compile time constants, for |
| 68 | initializing protection_map. The cachebits are fixed later. */ |
| 69 | #define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) |
| 70 | #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) |
| 71 | #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) |
| 72 | #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) |
| 73 | |
| 74 | /* |
| 75 | * The m68k can't do page protection for execute, and considers that the same are read. |
| 76 | * Also, write permissions imply read permissions. This is the closest we can get.. |
| 77 | */ |
| 78 | #define __P000 PAGE_NONE_C |
| 79 | #define __P001 PAGE_READONLY_C |
| 80 | #define __P010 PAGE_COPY_C |
| 81 | #define __P011 PAGE_COPY_C |
| 82 | #define __P100 PAGE_READONLY_C |
| 83 | #define __P101 PAGE_READONLY_C |
| 84 | #define __P110 PAGE_COPY_C |
| 85 | #define __P111 PAGE_COPY_C |
| 86 | |
| 87 | #define __S000 PAGE_NONE_C |
| 88 | #define __S001 PAGE_READONLY_C |
| 89 | #define __S010 PAGE_SHARED_C |
| 90 | #define __S011 PAGE_SHARED_C |
| 91 | #define __S100 PAGE_READONLY_C |
| 92 | #define __S101 PAGE_READONLY_C |
| 93 | #define __S110 PAGE_SHARED_C |
| 94 | #define __S111 PAGE_SHARED_C |
| 95 | |
| 96 | /* |
| 97 | * Conversion functions: convert a page and protection to a page entry, |
| 98 | * and a page entry and page directory to the page they refer to. |
| 99 | */ |
| 100 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
| 101 | |
| 102 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| 103 | { |
| 104 | pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); |
| 105 | return pte; |
| 106 | } |
| 107 | |
| 108 | static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) |
| 109 | { |
| 110 | unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; |
| 111 | unsigned long *ptr = pmdp->pmd; |
| 112 | short i = 16; |
| 113 | while (--i >= 0) { |
| 114 | *ptr++ = ptbl; |
| 115 | ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) |
| 120 | { |
| 121 | pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); |
| 122 | } |
| 123 | |
| 124 | #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) |
| 125 | #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) |
| 126 | #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK)) |
| 127 | |
| 128 | |
| 129 | #define pte_none(pte) (!pte_val(pte)) |
| 130 | #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
| 131 | #define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; }) |
| 132 | |
Roman Zippel | 12d810c | 2007-05-31 00:40:54 -0700 | [diff] [blame] | 133 | #define pte_page(pte) virt_to_page(__va(pte_val(pte))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) |
| 135 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
| 136 | |
| 137 | #define pmd_none(pmd) (!pmd_val(pmd)) |
| 138 | #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) |
| 139 | #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) |
| 140 | #define pmd_clear(pmdp) ({ \ |
| 141 | unsigned long *__ptr = pmdp->pmd; \ |
| 142 | short __i = 16; \ |
| 143 | while (--__i >= 0) \ |
| 144 | *__ptr++ = 0; \ |
| 145 | }) |
Roman Zippel | 12d810c | 2007-05-31 00:40:54 -0700 | [diff] [blame] | 146 | #define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | |
| 149 | #define pgd_none(pgd) (!pgd_val(pgd)) |
| 150 | #define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE) |
| 151 | #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE) |
| 152 | #define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; }) |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 153 | #define pgd_page(pgd) (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | #define pte_ERROR(e) \ |
| 156 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
| 157 | #define pmd_ERROR(e) \ |
| 158 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
| 159 | #define pgd_ERROR(e) \ |
| 160 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
| 161 | |
| 162 | |
| 163 | /* |
| 164 | * The following only work if pte_present() is true. |
| 165 | * Undefined behaviour if not.. |
| 166 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } |
| 169 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } |
| 170 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } |
| 171 | |
| 172 | static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } |
| 174 | static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } |
| 175 | static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } |
| 177 | static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } |
| 178 | static inline pte_t pte_mknocache(pte_t pte) |
| 179 | { |
| 180 | pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; |
| 181 | return pte; |
| 182 | } |
| 183 | static inline pte_t pte_mkcache(pte_t pte) |
| 184 | { |
| 185 | pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; |
| 186 | return pte; |
| 187 | } |
| 188 | |
| 189 | #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) |
| 190 | |
| 191 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) |
| 192 | |
| 193 | /* to find an entry in a page-table-directory */ |
| 194 | static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address) |
| 195 | { |
| 196 | return mm->pgd + pgd_index(address); |
| 197 | } |
| 198 | |
| 199 | #define swapper_pg_dir kernel_pg_dir |
| 200 | extern pgd_t kernel_pg_dir[128]; |
| 201 | |
| 202 | static inline pgd_t *pgd_offset_k(unsigned long address) |
| 203 | { |
| 204 | return kernel_pg_dir + (address >> PGDIR_SHIFT); |
| 205 | } |
| 206 | |
| 207 | |
| 208 | /* Find an entry in the second-level page table.. */ |
| 209 | static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address) |
| 210 | { |
| 211 | return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1)); |
| 212 | } |
| 213 | |
| 214 | /* Find an entry in the third-level page table.. */ |
| 215 | static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address) |
| 216 | { |
| 217 | return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); |
| 218 | } |
| 219 | |
Roman Zippel | 12d810c | 2007-05-31 00:40:54 -0700 | [diff] [blame] | 220 | #define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | #define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address) |
Roman Zippel | 12d810c | 2007-05-31 00:40:54 -0700 | [diff] [blame] | 222 | #define pte_unmap(pte) ((void)0) |
| 223 | #define pte_unmap_nested(pte) ((void)0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | /* |
| 226 | * Allocate and free page tables. The xxx_kernel() versions are |
| 227 | * used to allocate a kernel page table - this turns on ASN bits |
| 228 | * if any. |
| 229 | */ |
| 230 | |
| 231 | /* Prior to calling these routines, the page should have been flushed |
| 232 | * from both the cache and ATC, or the CPU might not notice that the |
| 233 | * cache setting for the page has been changed. -jskov |
| 234 | */ |
| 235 | static inline void nocache_page(void *vaddr) |
| 236 | { |
| 237 | unsigned long addr = (unsigned long)vaddr; |
| 238 | |
| 239 | if (CPU_IS_040_OR_060) { |
| 240 | pgd_t *dir; |
| 241 | pmd_t *pmdp; |
| 242 | pte_t *ptep; |
| 243 | |
| 244 | dir = pgd_offset_k(addr); |
| 245 | pmdp = pmd_offset(dir, addr); |
| 246 | ptep = pte_offset_kernel(pmdp, addr); |
| 247 | *ptep = pte_mknocache(*ptep); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | static inline void cache_page(void *vaddr) |
| 252 | { |
| 253 | unsigned long addr = (unsigned long)vaddr; |
| 254 | |
| 255 | if (CPU_IS_040_OR_060) { |
| 256 | pgd_t *dir; |
| 257 | pmd_t *pmdp; |
| 258 | pte_t *ptep; |
| 259 | |
| 260 | dir = pgd_offset_k(addr); |
| 261 | pmdp = pmd_offset(dir, addr); |
| 262 | ptep = pte_offset_kernel(pmdp, addr); |
| 263 | *ptep = pte_mkcache(*ptep); |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | #define PTE_FILE_MAX_BITS 28 |
| 268 | |
| 269 | static inline unsigned long pte_to_pgoff(pte_t pte) |
| 270 | { |
| 271 | return pte.pte >> 4; |
| 272 | } |
| 273 | |
| 274 | static inline pte_t pgoff_to_pte(unsigned off) |
| 275 | { |
| 276 | pte_t pte = { (off << 4) + _PAGE_FILE }; |
| 277 | return pte; |
| 278 | } |
| 279 | |
| 280 | /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ |
| 281 | #define __swp_type(x) (((x).val >> 4) & 0xff) |
| 282 | #define __swp_offset(x) ((x).val >> 12) |
| 283 | #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) }) |
| 284 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| 285 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |
| 286 | |
| 287 | #endif /* !__ASSEMBLY__ */ |
| 288 | #endif /* _MOTOROLA_PGTABLE_H */ |