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 /* Use these fake page-protections on PMDs. */ 70 #define SUN3_PMD_VALID (0x00000001) 71 #define SUN3_PMD_MASK (0x0000003F) 72 #define SUN3_PMD_MAGIC (0x0000002B) 73 74 /* We borrow bit 6 to store the exclusive marker in swap PTEs. */ 75 #define _PAGE_SWP_EXCLUSIVE 0x040 76 77 #ifndef __ASSEMBLY__ 78 79 /* 80 * Conversion functions: convert a page and protection to a page entry, 81 * and a page entry and page directory to the page they refer to. 82 */ 83 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 84 85 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 86 { 87 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); 88 return pte; 89 } 90 91 #define pmd_set(pmdp,ptep) do {} while (0) 92 93 #define __pte_page(pte) \ 94 (__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) 95 96 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 97 { 98 return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK); 99 } 100 101 static inline int pte_none (pte_t pte) { return !pte_val (pte); } 102 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; } 103 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep) 104 { 105 pte_val (*ptep) = 0; 106 } 107 108 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK) 109 #define pfn_pte(pfn, pgprot) \ 110 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; }) 111 112 #define pte_page(pte) virt_to_page(__pte_page(pte)) 113 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT) 114 #define pmd_page(pmd) virt_to_page((void *)pmd_page_vaddr(pmd)) 115 116 117 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); } 118 #define pmd_none(pmd) pmd_none2(&(pmd)) 119 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; } 120 static inline int pmd_bad2 (pmd_t *pmd) { return 0; } 121 #define pmd_bad(pmd) pmd_bad2(&(pmd)) 122 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; } 123 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */ 124 #define pmd_present(pmd) (!pmd_none2(&(pmd))) 125 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; } 126 127 128 #define pte_ERROR(e) \ 129 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 130 #define pgd_ERROR(e) \ 131 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 132 133 134 /* 135 * The following only work if pte_present() is true. 136 * Undefined behaviour if not... 137 * [we have the full set here even if they don't change from m68k] 138 */ 139 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } 140 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } 141 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } 142 143 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } 144 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } 145 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } 146 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } 147 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } 148 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } 149 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } 150 // use this version when caches work... 151 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } 152 // until then, use: 153 static inline pte_t pte_mkcache(pte_t pte) { return pte; } 154 155 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 156 extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; 157 158 /* 159 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 160 * are !pte_none() && !pte_present(). 161 * 162 * Format of swap PTEs: 163 * 164 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 165 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 166 * 0 <--------------------- offset ----------------> E <- type --> 167 * 168 * E is the exclusive marker that is not stored in swap entries. 169 */ 170 #define __swp_type(x) ((x).val & 0x3f) 171 #define __swp_offset(x) (((x).val) >> 7) 172 #define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \ 173 (((offset) << 7) & ~SUN3_PAGE_VALID)) }) 174 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 175 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 176 177 static inline int pte_swp_exclusive(pte_t pte) 178 { 179 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 180 } 181 182 static inline pte_t pte_swp_mkexclusive(pte_t pte) 183 { 184 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 185 return pte; 186 } 187 188 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 189 { 190 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 191 return pte; 192 } 193 194 #endif /* !__ASSEMBLY__ */ 195 #endif /* !_SUN3_PGTABLE_H */ 196