1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _MOTOROLA_PGTABLE_H 3 #define _MOTOROLA_PGTABLE_H 4 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_READWRITE 0x000 13 #define _PAGE_ACCESSED 0x008 14 #define _PAGE_DIRTY 0x010 15 #define _PAGE_SUPER 0x080 /* 68040 supervisor only */ 16 #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ 17 #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ 18 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ 19 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ 20 #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ 21 #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ 22 23 #define _DESCTYPE_MASK 0x003 24 25 #define _CACHEMASK040 (~0x060) 26 27 /* 28 * Currently set to the minimum alignment of table pointers (256 bytes). 29 * The hardware only uses the low 4 bits for state: 30 * 31 * 3 - Used 32 * 2 - Write Protected 33 * 0,1 - Descriptor Type 34 * 35 * and has the rest of the bits reserved. 36 */ 37 #define _TABLE_MASK (0xffffff00) 38 39 #define _PAGE_TABLE (_PAGE_SHORT) 40 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) 41 42 #define _PAGE_PROTNONE 0x004 43 44 #ifndef __ASSEMBLY__ 45 46 /* This is the cache mode to be used for pages containing page descriptors for 47 * processors >= '040. It is in pte_mknocache(), and the variable is defined 48 * and initialized in head.S */ 49 extern int m68k_pgtable_cachemode; 50 51 /* This is the cache mode for normal pages, for supervisor access on 52 * processors >= '040. It is used in pte_mkcache(), and the variable is 53 * defined and initialized in head.S */ 54 55 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH) 56 #define m68k_supervisor_cachemode _PAGE_CACHE040W 57 #elif defined(CPU_M68040_OR_M68060_ONLY) 58 #define m68k_supervisor_cachemode _PAGE_CACHE040 59 #elif defined(CPU_M68020_OR_M68030_ONLY) 60 #define m68k_supervisor_cachemode 0 61 #else 62 extern int m68k_supervisor_cachemode; 63 #endif 64 65 #if defined(CPU_M68040_OR_M68060_ONLY) 66 #define mm_cachebits _PAGE_CACHE040 67 #elif defined(CPU_M68020_OR_M68030_ONLY) 68 #define mm_cachebits 0 69 #else 70 extern unsigned long mm_cachebits; 71 #endif 72 73 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits) 74 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) 75 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) 76 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) 77 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) 78 79 /* Alternate definitions that are compile time constants, for 80 initializing protection_map. The cachebits are fixed later. */ 81 #define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) 82 #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) 83 #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) 84 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) 85 86 /* 87 * The m68k can't do page protection for execute, and considers that the same are read. 88 * Also, write permissions imply read permissions. This is the closest we can get.. 89 */ 90 #define __P000 PAGE_NONE_C 91 #define __P001 PAGE_READONLY_C 92 #define __P010 PAGE_COPY_C 93 #define __P011 PAGE_COPY_C 94 #define __P100 PAGE_READONLY_C 95 #define __P101 PAGE_READONLY_C 96 #define __P110 PAGE_COPY_C 97 #define __P111 PAGE_COPY_C 98 99 #define __S000 PAGE_NONE_C 100 #define __S001 PAGE_READONLY_C 101 #define __S010 PAGE_SHARED_C 102 #define __S011 PAGE_SHARED_C 103 #define __S100 PAGE_READONLY_C 104 #define __S101 PAGE_READONLY_C 105 #define __S110 PAGE_SHARED_C 106 #define __S111 PAGE_SHARED_C 107 108 /* 109 * Conversion functions: convert a page and protection to a page entry, 110 * and a page entry and page directory to the page they refer to. 111 */ 112 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 113 114 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 115 { 116 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); 117 return pte; 118 } 119 120 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) 121 { 122 pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; 123 } 124 125 static inline void pud_set(pud_t *pudp, pmd_t *pmdp) 126 { 127 pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); 128 } 129 130 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) 131 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) 132 #define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK)) 133 134 135 #define pte_none(pte) (!pte_val(pte)) 136 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 137 #define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; }) 138 139 #define pte_page(pte) virt_to_page(__va(pte_val(pte))) 140 #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) 141 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) 142 143 #define pmd_none(pmd) (!pmd_val(pmd)) 144 #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) 145 #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) 146 #define pmd_clear(pmdp) ({ pmd_val(*pmdp) = 0; }) 147 148 /* 149 * m68k does not have huge pages (020/030 actually could), but generic code 150 * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to 151 * make the compiler happy. 152 */ 153 #define pmd_page(pmd) NULL 154 155 156 #define pud_none(pud) (!pud_val(pud)) 157 #define pud_bad(pud) ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE) 158 #define pud_present(pud) (pud_val(pud) & _PAGE_TABLE) 159 #define pud_clear(pudp) ({ pud_val(*pudp) = 0; }) 160 #define pud_page(pud) (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT)) 161 162 #define pte_ERROR(e) \ 163 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 164 #define pmd_ERROR(e) \ 165 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 166 #define pgd_ERROR(e) \ 167 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 168 169 170 /* 171 * The following only work if pte_present() is true. 172 * Undefined behaviour if not.. 173 */ 174 static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } 175 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 176 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 177 178 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } 179 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 180 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 181 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } 182 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 183 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 184 static inline pte_t pte_mknocache(pte_t pte) 185 { 186 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; 187 return pte; 188 } 189 static 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 */ 200 static inline pgd_t *pgd_offset(const struct mm_struct *mm, 201 unsigned long address) 202 { 203 return mm->pgd + pgd_index(address); 204 } 205 206 #define swapper_pg_dir kernel_pg_dir 207 extern pgd_t kernel_pg_dir[128]; 208 209 static inline pgd_t *pgd_offset_k(unsigned long address) 210 { 211 return kernel_pg_dir + (address >> PGDIR_SHIFT); 212 } 213 214 215 /* Find an entry in the second-level page table.. */ 216 static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address) 217 { 218 return (pmd_t *)pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1)); 219 } 220 221 /* Find an entry in the third-level page table.. */ 222 static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address) 223 { 224 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 225 } 226 227 #define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) 228 #define pte_unmap(pte) ((void)0) 229 230 /* 231 * Allocate and free page tables. The xxx_kernel() versions are 232 * used to allocate a kernel page table - this turns on ASN bits 233 * if any. 234 */ 235 236 /* Prior to calling these routines, the page should have been flushed 237 * from both the cache and ATC, or the CPU might not notice that the 238 * cache setting for the page has been changed. -jskov 239 */ 240 static inline void nocache_page(void *vaddr) 241 { 242 unsigned long addr = (unsigned long)vaddr; 243 244 if (CPU_IS_040_OR_060) { 245 pgd_t *dir; 246 p4d_t *p4dp; 247 pud_t *pudp; 248 pmd_t *pmdp; 249 pte_t *ptep; 250 251 dir = pgd_offset_k(addr); 252 p4dp = p4d_offset(dir, addr); 253 pudp = pud_offset(p4dp, addr); 254 pmdp = pmd_offset(pudp, addr); 255 ptep = pte_offset_kernel(pmdp, addr); 256 *ptep = pte_mknocache(*ptep); 257 } 258 } 259 260 static inline void cache_page(void *vaddr) 261 { 262 unsigned long addr = (unsigned long)vaddr; 263 264 if (CPU_IS_040_OR_060) { 265 pgd_t *dir; 266 p4d_t *p4dp; 267 pud_t *pudp; 268 pmd_t *pmdp; 269 pte_t *ptep; 270 271 dir = pgd_offset_k(addr); 272 p4dp = p4d_offset(dir, addr); 273 pudp = pud_offset(p4dp, addr); 274 pmdp = pmd_offset(pudp, addr); 275 ptep = pte_offset_kernel(pmdp, addr); 276 *ptep = pte_mkcache(*ptep); 277 } 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 */ 289