1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SUN3_PGTABLE_H 3 #define _SUN3_PGTABLE_H 4 5 #include <asm/sun3mmu.h> 6 7 #ifndef __ASSEMBLY__ 8 #include <asm/virtconvert.h> 9 #include <linux/linkage.h> 10 11 /* 12 * This file contains all the things which change drastically for the sun3 13 * pagetable stuff, to avoid making too much of a mess of the generic m68k 14 * `pgtable.h'; this should only be included from the generic file. --m 15 */ 16 17 /* For virtual address to physical address conversion */ 18 #define VTOP(addr) __pa(addr) 19 #define PTOV(addr) __va(addr) 20 21 22 #endif /* !__ASSEMBLY__ */ 23 24 /* These need to be defined for compatibility although the sun3 doesn't use them */ 25 #define _PAGE_NOCACHE030 0x040 26 #define _CACHEMASK040 (~0x060) 27 #define _PAGE_NOCACHE_S 0x040 28 29 /* Page protection values within PTE. */ 30 #define SUN3_PAGE_VALID (0x80000000) 31 #define SUN3_PAGE_WRITEABLE (0x40000000) 32 #define SUN3_PAGE_SYSTEM (0x20000000) 33 #define SUN3_PAGE_NOCACHE (0x10000000) 34 #define SUN3_PAGE_ACCESSED (0x02000000) 35 #define SUN3_PAGE_MODIFIED (0x01000000) 36 37 38 /* Externally used page protection values. */ 39 #define _PAGE_PRESENT (SUN3_PAGE_VALID) 40 #define _PAGE_ACCESSED (SUN3_PAGE_ACCESSED) 41 42 /* Compound page protection values. */ 43 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix... 44 // is it just PAGE_KERNEL and PAGE_SHARED? 45 #define PAGE_NONE __pgprot(SUN3_PAGE_VALID \ 46 | SUN3_PAGE_ACCESSED \ 47 | SUN3_PAGE_NOCACHE) 48 #define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \ 49 | SUN3_PAGE_WRITEABLE \ 50 | SUN3_PAGE_ACCESSED \ 51 | SUN3_PAGE_NOCACHE) 52 #define PAGE_COPY __pgprot(SUN3_PAGE_VALID \ 53 | SUN3_PAGE_ACCESSED \ 54 | SUN3_PAGE_NOCACHE) 55 #define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \ 56 | SUN3_PAGE_ACCESSED \ 57 | SUN3_PAGE_NOCACHE) 58 #define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \ 59 | SUN3_PAGE_WRITEABLE \ 60 | SUN3_PAGE_SYSTEM \ 61 | SUN3_PAGE_NOCACHE \ 62 | SUN3_PAGE_ACCESSED \ 63 | SUN3_PAGE_MODIFIED) 64 #define PAGE_INIT __pgprot(SUN3_PAGE_VALID \ 65 | SUN3_PAGE_WRITEABLE \ 66 | SUN3_PAGE_SYSTEM \ 67 | SUN3_PAGE_NOCACHE) 68 69 /* 70 * Page protections for initialising protection_map. The sun3 has only two 71 * protection settings, valid (implying read and execute) and writeable. These 72 * are as close as we can get... 73 */ 74 #define __P000 PAGE_NONE 75 #define __P001 PAGE_READONLY 76 #define __P010 PAGE_COPY 77 #define __P011 PAGE_COPY 78 #define __P100 PAGE_READONLY 79 #define __P101 PAGE_READONLY 80 #define __P110 PAGE_COPY 81 #define __P111 PAGE_COPY 82 83 #define __S000 PAGE_NONE 84 #define __S001 PAGE_READONLY 85 #define __S010 PAGE_SHARED 86 #define __S011 PAGE_SHARED 87 #define __S100 PAGE_READONLY 88 #define __S101 PAGE_READONLY 89 #define __S110 PAGE_SHARED 90 #define __S111 PAGE_SHARED 91 92 /* Use these fake page-protections on PMDs. */ 93 #define SUN3_PMD_VALID (0x00000001) 94 #define SUN3_PMD_MASK (0x0000003F) 95 #define SUN3_PMD_MAGIC (0x0000002B) 96 97 #ifndef __ASSEMBLY__ 98 99 /* 100 * Conversion functions: convert a page and protection to a page entry, 101 * and a page entry and page directory to the page they refer to. 102 */ 103 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 104 105 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 106 { 107 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); 108 return pte; 109 } 110 111 #define pmd_set(pmdp,ptep) do {} while (0) 112 113 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) 114 { 115 pgd_val(*pgdp) = virt_to_phys(pmdp); 116 } 117 118 #define __pte_page(pte) \ 119 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) 120 #define __pmd_page(pmd) \ 121 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK)) 122 123 static inline int pte_none (pte_t pte) { return !pte_val (pte); } 124 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; } 125 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep) 126 { 127 pte_val (*ptep) = 0; 128 } 129 130 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK) 131 #define pfn_pte(pfn, pgprot) \ 132 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; }) 133 134 #define pte_page(pte) virt_to_page(__pte_page(pte)) 135 #define pmd_page(pmd) virt_to_page(__pmd_page(pmd)) 136 137 138 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); } 139 #define pmd_none(pmd) pmd_none2(&(pmd)) 140 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; } 141 static inline int pmd_bad2 (pmd_t *pmd) { return 0; } 142 #define pmd_bad(pmd) pmd_bad2(&(pmd)) 143 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; } 144 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */ 145 #define pmd_present(pmd) (!pmd_none2(&(pmd))) 146 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; } 147 148 static inline int pgd_none (pgd_t pgd) { return 0; } 149 static inline int pgd_bad (pgd_t pgd) { return 0; } 150 static inline int pgd_present (pgd_t pgd) { return 1; } 151 static inline void pgd_clear (pgd_t *pgdp) {} 152 153 154 #define pte_ERROR(e) \ 155 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 156 #define pmd_ERROR(e) \ 157 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 158 #define pgd_ERROR(e) \ 159 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 160 161 162 /* 163 * The following only work if pte_present() is true. 164 * Undefined behaviour if not... 165 * [we have the full set here even if they don't change from m68k] 166 */ 167 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } 168 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } 169 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } 170 static inline int pte_special(pte_t pte) { return 0; } 171 172 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } 173 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } 174 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } 175 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } 176 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } 177 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } 178 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } 179 // use this version when caches work... 180 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } 181 // until then, use: 182 static inline pte_t pte_mkcache(pte_t pte) { return pte; } 183 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 184 185 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 186 extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; 187 188 /* Find an entry in a pagetable directory. */ 189 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 190 191 #define pgd_offset(mm, address) \ 192 ((mm)->pgd + pgd_index(address)) 193 194 /* Find an entry in a kernel pagetable directory. */ 195 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 196 197 /* Find an entry in the second-level pagetable. */ 198 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address) 199 { 200 return (pmd_t *) pgd; 201 } 202 203 /* Find an entry in the third-level pagetable. */ 204 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) 205 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address)) 206 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address)) 207 #define pte_unmap(pte) do { } while (0) 208 209 /* Macros to (de)construct the fake PTEs representing swap pages. */ 210 #define __swp_type(x) ((x).val & 0x7F) 211 #define __swp_offset(x) (((x).val) >> 7) 212 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) 213 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 214 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 215 216 #endif /* !__ASSEMBLY__ */ 217 #endif /* !_SUN3_PGTABLE_H */ 218