1#ifndef _MOTOROLA_PGTABLE_H 2#define _MOTOROLA_PGTABLE_H 3 4#include <linux/config.h> 5 6/* 7 * Definitions for MMU descriptors 8 */ 9#define _PAGE_PRESENT 0x001 10#define _PAGE_SHORT 0x002 11#define _PAGE_RONLY 0x004 12#define _PAGE_ACCESSED 0x008 13#define _PAGE_DIRTY 0x010 14#define _PAGE_SUPER 0x080 /* 68040 supervisor only */ 15#define _PAGE_FAKE_SUPER 0x200 /* fake supervisor only on 680[23]0 */ 16#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ 17#define _PAGE_COW 0x800 /* implemented in software */ 18#define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ 19#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ 20#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ 21#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ 22#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ 23 24#define _DESCTYPE_MASK 0x003 25 26#define _CACHEMASK040 (~0x060) 27#define _TABLE_MASK (0xfffffe00) 28 29#define _PAGE_TABLE (_PAGE_SHORT) 30#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) 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(CONFIG_060_WRITETHROUGH) 44extern int m68k_supervisor_cachemode; 45#else 46#define m68k_supervisor_cachemode _PAGE_CACHE040 47#endif 48 49#if defined(CPU_M68040_OR_M68060_ONLY) 50#define mm_cachebits _PAGE_CACHE040 51#elif defined(CPU_M68020_OR_M68030_ONLY) 52#define mm_cachebits 0 53#else 54extern unsigned long mm_cachebits; 55#endif 56 57#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) 58#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) 59#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) 60#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) 61#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) 62 63/* Alternate definitions that are compile time constants, for 64 initializing protection_map. The cachebits are fixed later. */ 65#define PAGE_NONE_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) 66#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) 67#define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) 68#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) 69 70/* 71 * The m68k can't do page protection for execute, and considers that the same are read. 72 * Also, write permissions imply read permissions. This is the closest we can get.. 73 */ 74#define __P000 PAGE_NONE_C 75#define __P001 PAGE_READONLY_C 76#define __P010 PAGE_COPY_C 77#define __P011 PAGE_COPY_C 78#define __P100 PAGE_READONLY_C 79#define __P101 PAGE_READONLY_C 80#define __P110 PAGE_COPY_C 81#define __P111 PAGE_COPY_C 82 83#define __S000 PAGE_NONE_C 84#define __S001 PAGE_READONLY_C 85#define __S010 PAGE_SHARED_C 86#define __S011 PAGE_SHARED_C 87#define __S100 PAGE_READONLY_C 88#define __S101 PAGE_READONLY_C 89#define __S110 PAGE_SHARED_C 90#define __S111 PAGE_SHARED_C 91 92/* 93 * Conversion functions: convert a page and protection to a page entry, 94 * and a page entry and page directory to the page they refer to. 95 */ 96#define __mk_pte(page, pgprot) \ 97({ \ 98 pte_t __pte; \ 99 \ 100 pte_val(__pte) = __pa(page) + pgprot_val(pgprot); \ 101 __pte; \ 102}) 103#define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot)) 104#define mk_pte_phys(physpage, pgprot) \ 105({ \ 106 pte_t __pte; \ 107 \ 108 pte_val(__pte) = (physpage) + pgprot_val(pgprot); \ 109 __pte; \ 110}) 111 112extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 113{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } 114 115extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep) 116{ 117 unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; 118 unsigned long *ptr = pmdp->pmd; 119 short i = 16; 120 while (--i >= 0) { 121 *ptr++ = ptbl; 122 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16); 123 } 124} 125 126extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp) 127{ pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); } 128 129#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) 130#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) 131#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK)) 132 133 134#define pte_none(pte) (!pte_val(pte)) 135#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_FAKE_SUPER)) 136#define pte_clear(ptep) ({ pte_val(*(ptep)) = 0; }) 137#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT) 138 139#define pmd_none(pmd) (!pmd_val(pmd)) 140#define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) 141#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) 142#define pmd_clear(pmdp) ({ \ 143 unsigned long *__ptr = pmdp->pmd; \ 144 short __i = 16; \ 145 while (--__i >= 0) \ 146 *__ptr++ = 0; \ 147}) 148 149 150#define pgd_none(pgd) (!pgd_val(pgd)) 151#define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE) 152#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE) 153#define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; }) 154#define pte_page(pte) (mem_map+pte_pagenr(pte)) 155 156#define pte_ERROR(e) \ 157 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 158#define pmd_ERROR(e) \ 159 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 160#define pgd_ERROR(e) \ 161 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 162 163 164/* 165 * The following only work if pte_present() is true. 166 * Undefined behaviour if not.. 167 */ 168extern inline int pte_read(pte_t pte) { return 1; } 169extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } 170extern inline int pte_exec(pte_t pte) { return 1; } 171extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 172extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 173 174extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } 175extern inline pte_t pte_rdprotect(pte_t pte) { return pte; } 176extern inline pte_t pte_exprotect(pte_t pte) { return pte; } 177extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 178extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 179extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } 180extern inline pte_t pte_mkread(pte_t pte) { return pte; } 181extern inline pte_t pte_mkexec(pte_t pte) { return pte; } 182extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 183extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 184extern inline pte_t pte_mknocache(pte_t pte) 185{ 186 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; 187 return pte; 188} 189extern inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; } 190 191#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) 192 193#define pgd_index(address) ((address) >> PGDIR_SHIFT) 194 195/* to find an entry in a page-table-directory */ 196extern inline pgd_t * pgd_offset(struct mm_struct * mm, unsigned long address) 197{ 198 return mm->pgd + pgd_index(address); 199} 200 201#define swapper_pg_dir kernel_pg_dir 202extern pgd_t kernel_pg_dir[128]; 203 204extern inline pgd_t * pgd_offset_k(unsigned long address) 205{ 206 return kernel_pg_dir + (address >> PGDIR_SHIFT); 207} 208 209 210/* Find an entry in the second-level page table.. */ 211extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) 212{ 213 return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1)); 214} 215 216/* Find an entry in the third-level page table.. */ 217extern inline pte_t * pte_offset(pmd_t * pmdp, unsigned long address) 218{ 219 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 220} 221 222 223/* 224 * Allocate and free page tables. The xxx_kernel() versions are 225 * used to allocate a kernel page table - this turns on ASN bits 226 * if any. 227 */ 228 229/* Prior to calling these routines, the page should have been flushed 230 * from both the cache and ATC, or the CPU might not notice that the 231 * cache setting for the page has been changed. -jskov 232 */ 233static inline void nocache_page (unsigned long vaddr) 234{ 235 if (CPU_IS_040_OR_060) { 236 pgd_t *dir; 237 pmd_t *pmdp; 238 pte_t *ptep; 239 240 dir = pgd_offset_k(vaddr); 241 pmdp = pmd_offset(dir,vaddr); 242 ptep = pte_offset(pmdp,vaddr); 243 *ptep = pte_mknocache(*ptep); 244 } 245} 246 247static inline void cache_page (unsigned long vaddr) 248{ 249 if (CPU_IS_040_OR_060) { 250 pgd_t *dir; 251 pmd_t *pmdp; 252 pte_t *ptep; 253 254 dir = pgd_offset_k(vaddr); 255 pmdp = pmd_offset(dir,vaddr); 256 ptep = pte_offset(pmdp,vaddr); 257 *ptep = pte_mkcache(*ptep); 258 } 259} 260 261 262#endif /* !__ASSEMBLY__ */ 263#endif /* _MOTOROLA_PGTABLE_H */ 264