Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _MOTOROLA_PGTABLE_H #define _MOTOROLA_PGTABLE_H /* * Definitions for MMU descriptors */ #define _PAGE_PRESENT 0x001 #define _PAGE_SHORT 0x002 #define _PAGE_RONLY 0x004 #define _PAGE_READWRITE 0x000 #define _PAGE_ACCESSED 0x008 #define _PAGE_DIRTY 0x010 #define _PAGE_SUPER 0x080 /* 68040 supervisor only */ #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ #define _DESCTYPE_MASK 0x003 #define _CACHEMASK040 (~0x060) /* * Currently set to the minimum alignment of table pointers (256 bytes). * The hardware only uses the low 4 bits for state: * * 3 - Used * 2 - Write Protected * 0,1 - Descriptor Type * * and has the rest of the bits reserved. */ #define _TABLE_MASK (0xffffff00) #define _PAGE_TABLE (_PAGE_SHORT) #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) #define _PAGE_PROTNONE 0x004 #ifndef __ASSEMBLY__ /* This is the cache mode to be used for pages containing page descriptors for * processors >= '040. It is in pte_mknocache(), and the variable is defined * and initialized in head.S */ extern int m68k_pgtable_cachemode; /* This is the cache mode for normal pages, for supervisor access on * processors >= '040. It is used in pte_mkcache(), and the variable is * defined and initialized in head.S */ #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH) #define m68k_supervisor_cachemode _PAGE_CACHE040W #elif defined(CPU_M68040_OR_M68060_ONLY) #define m68k_supervisor_cachemode _PAGE_CACHE040 #elif defined(CPU_M68020_OR_M68030_ONLY) #define m68k_supervisor_cachemode 0 #else extern int m68k_supervisor_cachemode; #endif #if defined(CPU_M68040_OR_M68060_ONLY) #define mm_cachebits _PAGE_CACHE040 #elif defined(CPU_M68020_OR_M68030_ONLY) #define mm_cachebits 0 #else extern unsigned long mm_cachebits; #endif #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) /* Alternate definitions that are compile time constants, for initializing protection_map. The cachebits are fixed later. */ #define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) /* * The m68k can't do page protection for execute, and considers that the same are read. * Also, write permissions imply read permissions. This is the closest we can get.. */ #define __P000 PAGE_NONE_C #define __P001 PAGE_READONLY_C #define __P010 PAGE_COPY_C #define __P011 PAGE_COPY_C #define __P100 PAGE_READONLY_C #define __P101 PAGE_READONLY_C #define __P110 PAGE_COPY_C #define __P111 PAGE_COPY_C #define __S000 PAGE_NONE_C #define __S001 PAGE_READONLY_C #define __S010 PAGE_SHARED_C #define __S011 PAGE_SHARED_C #define __S100 PAGE_READONLY_C #define __S101 PAGE_READONLY_C #define __S110 PAGE_SHARED_C #define __S111 PAGE_SHARED_C #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd)) /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) { pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; } static inline void pud_set(pud_t *pudp, pmd_t *pmdp) { pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); } #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) #define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) #define pud_pgtable(pud) ((pmd_t *)__va(pud_val(pud) & _TABLE_MASK)) #define pte_none(pte) (!pte_val(pte)) #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; }) #define pte_page(pte) virt_to_page(__va(pte_val(pte))) #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) #define pmd_clear(pmdp) ({ pmd_val(*pmdp) = 0; }) /* * m68k does not have huge pages (020/030 actually could), but generic code * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to * make the compiler happy. */ #define pmd_page(pmd) NULL #define pud_none(pud) (!pud_val(pud)) #define pud_bad(pud) ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE) #define pud_present(pud) (pud_val(pud) & _PAGE_TABLE) #define pud_clear(pudp) ({ pud_val(*pudp) = 0; }) #define pud_page(pud) (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT)) #define pte_ERROR(e) \ printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) #define pmd_ERROR(e) \ printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; return pte; } static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; } #define swapper_pg_dir kernel_pg_dir extern pgd_t kernel_pg_dir[128]; /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ #define __swp_type(x) (((x).val >> 4) & 0xff) #define __swp_offset(x) ((x).val >> 12) #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #endif /* !__ASSEMBLY__ */ #endif /* _MOTOROLA_PGTABLE_H */ |