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 #ifndef __ASSEMBLY__ 75 76 /* 77 * Conversion functions: convert a page and protection to a page entry, 78 * and a page entry and page directory to the page they refer to. 79 */ 80 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 81 82 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 83 { 84 pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); 85 return pte; 86 } 87 88 #define pmd_set(pmdp,ptep) do {} while (0) 89 90 #define __pte_page(pte) \ 91 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) 92 93 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 94 { 95 return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK); 96 } 97 98 static inline int pte_none (pte_t pte) { return !pte_val (pte); } 99 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; } 100 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep) 101 { 102 pte_val (*ptep) = 0; 103 } 104 105 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK) 106 #define pfn_pte(pfn, pgprot) \ 107 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; }) 108 109 #define pte_page(pte) virt_to_page(__pte_page(pte)) 110 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT) 111 #define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd)) 112 113 114 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); } 115 #define pmd_none(pmd) pmd_none2(&(pmd)) 116 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; } 117 static inline int pmd_bad2 (pmd_t *pmd) { return 0; } 118 #define pmd_bad(pmd) pmd_bad2(&(pmd)) 119 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; } 120 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */ 121 #define pmd_present(pmd) (!pmd_none2(&(pmd))) 122 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; } 123 124 125 #define pte_ERROR(e) \ 126 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 127 #define pgd_ERROR(e) \ 128 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 129 130 131 /* 132 * The following only work if pte_present() is true. 133 * Undefined behaviour if not... 134 * [we have the full set here even if they don't change from m68k] 135 */ 136 static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } 137 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } 138 static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } 139 140 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } 141 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } 142 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } 143 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } 144 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } 145 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } 146 static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } 147 // use this version when caches work... 148 //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } 149 // until then, use: 150 static inline pte_t pte_mkcache(pte_t pte) { return pte; } 151 152 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 153 extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; 154 155 /* Macros to (de)construct the fake PTEs representing swap pages. */ 156 #define __swp_type(x) ((x).val & 0x7F) 157 #define __swp_offset(x) (((x).val) >> 7) 158 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) 159 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 160 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 161 162 #endif /* !__ASSEMBLY__ */ 163 #endif /* !_SUN3_PGTABLE_H */ 164