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