1#ifndef _MOTOROLA_PGTABLE_H 2#define _MOTOROLA_PGTABLE_H 3 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 */ 37extern 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 50extern 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 58extern 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 102static 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 108static 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 119static 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; }) 132 133#define pte_page(pte) virt_to_page(__va(pte_val(pte))) 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}) 146#define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd))) 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; }) 153#define pgd_page(pgd) (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT)) 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 */ 167static inline int pte_read(pte_t pte) { return 1; } 168static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } 169static inline int pte_exec(pte_t pte) { return 1; } 170static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 171static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 172static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 173 174static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } 175static inline pte_t pte_rdprotect(pte_t pte) { return pte; } 176static inline pte_t pte_exprotect(pte_t pte) { return pte; } 177static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 178static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 179static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } 180static inline pte_t pte_mkread(pte_t pte) { return pte; } 181static inline pte_t pte_mkexec(pte_t pte) { return pte; } 182static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 183static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 184static inline pte_t pte_mknocache(pte_t pte) 185{ 186 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; 187 return pte; 188} 189static inline pte_t pte_mkcache(pte_t pte) 190{ 191 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; 192 return pte; 193} 194 195#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) 196 197#define pgd_index(address) ((address) >> PGDIR_SHIFT) 198 199/* to find an entry in a page-table-directory */ 200static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address) 201{ 202 return mm->pgd + pgd_index(address); 203} 204 205#define swapper_pg_dir kernel_pg_dir 206extern pgd_t kernel_pg_dir[128]; 207 208static inline pgd_t *pgd_offset_k(unsigned long address) 209{ 210 return kernel_pg_dir + (address >> PGDIR_SHIFT); 211} 212 213 214/* Find an entry in the second-level page table.. */ 215static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address) 216{ 217 return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1)); 218} 219 220/* Find an entry in the third-level page table.. */ 221static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address) 222{ 223 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 224} 225 226#define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) 227#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address) 228#define pte_unmap(pte) ((void)0) 229#define pte_unmap_nested(pte) ((void)0) 230 231/* 232 * Allocate and free page tables. The xxx_kernel() versions are 233 * used to allocate a kernel page table - this turns on ASN bits 234 * if any. 235 */ 236 237/* Prior to calling these routines, the page should have been flushed 238 * from both the cache and ATC, or the CPU might not notice that the 239 * cache setting for the page has been changed. -jskov 240 */ 241static inline void nocache_page(void *vaddr) 242{ 243 unsigned long addr = (unsigned long)vaddr; 244 245 if (CPU_IS_040_OR_060) { 246 pgd_t *dir; 247 pmd_t *pmdp; 248 pte_t *ptep; 249 250 dir = pgd_offset_k(addr); 251 pmdp = pmd_offset(dir, addr); 252 ptep = pte_offset_kernel(pmdp, addr); 253 *ptep = pte_mknocache(*ptep); 254 } 255} 256 257static inline void cache_page(void *vaddr) 258{ 259 unsigned long addr = (unsigned long)vaddr; 260 261 if (CPU_IS_040_OR_060) { 262 pgd_t *dir; 263 pmd_t *pmdp; 264 pte_t *ptep; 265 266 dir = pgd_offset_k(addr); 267 pmdp = pmd_offset(dir, addr); 268 ptep = pte_offset_kernel(pmdp, addr); 269 *ptep = pte_mkcache(*ptep); 270 } 271} 272 273#define PTE_FILE_MAX_BITS 28 274 275static inline unsigned long pte_to_pgoff(pte_t pte) 276{ 277 return pte.pte >> 4; 278} 279 280static inline pte_t pgoff_to_pte(unsigned off) 281{ 282 pte_t pte = { (off << 4) + _PAGE_FILE }; 283 return pte; 284} 285 286/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ 287#define __swp_type(x) (((x).val >> 4) & 0xff) 288#define __swp_offset(x) ((x).val >> 12) 289#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) }) 290#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 291#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 292 293#endif /* !__ASSEMBLY__ */ 294#endif /* _MOTOROLA_PGTABLE_H */ 295