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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 | #define PTE_FILE_MAX_BITS 28 | |
42 | ||
43 | /* Compound page protection values. */ | |
44 | //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix... | |
45 | // is it just PAGE_KERNEL and PAGE_SHARED? | |
46 | #define PAGE_NONE __pgprot(SUN3_PAGE_VALID \ | |
47 | | SUN3_PAGE_ACCESSED \ | |
48 | | SUN3_PAGE_NOCACHE) | |
49 | #define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \ | |
50 | | SUN3_PAGE_WRITEABLE \ | |
51 | | SUN3_PAGE_ACCESSED \ | |
52 | | SUN3_PAGE_NOCACHE) | |
53 | #define PAGE_COPY __pgprot(SUN3_PAGE_VALID \ | |
54 | | SUN3_PAGE_ACCESSED \ | |
55 | | SUN3_PAGE_NOCACHE) | |
56 | #define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \ | |
57 | | SUN3_PAGE_ACCESSED \ | |
58 | | SUN3_PAGE_NOCACHE) | |
59 | #define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \ | |
60 | | SUN3_PAGE_WRITEABLE \ | |
61 | | SUN3_PAGE_SYSTEM \ | |
62 | | SUN3_PAGE_NOCACHE \ | |
63 | | SUN3_PAGE_ACCESSED \ | |
64 | | SUN3_PAGE_MODIFIED) | |
65 | #define PAGE_INIT __pgprot(SUN3_PAGE_VALID \ | |
66 | | SUN3_PAGE_WRITEABLE \ | |
67 | | SUN3_PAGE_SYSTEM \ | |
68 | | SUN3_PAGE_NOCACHE) | |
69 | ||
70 | /* | |
71 | * Page protections for initialising protection_map. The sun3 has only two | |
72 | * protection settings, valid (implying read and execute) and writeable. These | |
73 | * are as close as we can get... | |
74 | */ | |
75 | #define __P000 PAGE_NONE | |
76 | #define __P001 PAGE_READONLY | |
77 | #define __P010 PAGE_COPY | |
78 | #define __P011 PAGE_COPY | |
79 | #define __P100 PAGE_READONLY | |
80 | #define __P101 PAGE_READONLY | |
81 | #define __P110 PAGE_COPY | |
82 | #define __P111 PAGE_COPY | |
83 | ||
84 | #define __S000 PAGE_NONE | |
85 | #define __S001 PAGE_READONLY | |
86 | #define __S010 PAGE_SHARED | |
87 | #define __S011 PAGE_SHARED | |
88 | #define __S100 PAGE_READONLY | |
89 | #define __S101 PAGE_READONLY | |
90 | #define __S110 PAGE_SHARED | |
91 | #define __S111 PAGE_SHARED | |
92 | ||
93 | /* Use these fake page-protections on PMDs. */ | |
94 | #define SUN3_PMD_VALID (0x00000001) | |
95 | #define SUN3_PMD_MASK (0x0000003F) | |
96 | #define SUN3_PMD_MAGIC (0x0000002B) | |
97 | ||
98 | #ifndef __ASSEMBLY__ | |
99 | ||
100 | /* | |
101 | * Conversion functions: convert a page and protection to a page entry, | |
102 | * and a page entry and page directory to the page they refer to. | |
103 | */ | |
104 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
105 | ||
106 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
107 | { | |
108 | pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); | |
109 | return pte; | |
110 | } | |
111 | ||
112 | #define pmd_set(pmdp,ptep) do {} while (0) | |
113 | ||
114 | static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) | |
115 | { | |
116 | pgd_val(*pgdp) = virt_to_phys(pmdp); | |
117 | } | |
118 | ||
119 | #define __pte_page(pte) \ | |
120 | ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) | |
121 | #define __pmd_page(pmd) \ | |
122 | ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK)) | |
123 | ||
124 | static inline int pte_none (pte_t pte) { return !pte_val (pte); } | |
125 | static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; } | |
126 | static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
127 | { | |
128 | pte_val (*ptep) = 0; | |
129 | } | |
130 | ||
131 | #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK) | |
132 | #define pfn_pte(pfn, pgprot) \ | |
133 | ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; }) | |
134 | ||
135 | #define pte_page(pte) (mem_map+((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)) | |
136 | #define pmd_page(pmd) (mem_map+((__pmd_page(pmd) - PAGE_OFFSET) >> PAGE_SHIFT)) | |
137 | ||
138 | ||
139 | static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); } | |
140 | #define pmd_none(pmd) pmd_none2(&(pmd)) | |
141 | //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; } | |
142 | static inline int pmd_bad2 (pmd_t *pmd) { return 0; } | |
143 | #define pmd_bad(pmd) pmd_bad2(&(pmd)) | |
144 | static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; } | |
145 | /* #define pmd_present(pmd) pmd_present2(&(pmd)) */ | |
146 | #define pmd_present(pmd) (!pmd_none2(&(pmd))) | |
147 | static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; } | |
148 | ||
149 | static inline int pgd_none (pgd_t pgd) { return 0; } | |
150 | static inline int pgd_bad (pgd_t pgd) { return 0; } | |
151 | static inline int pgd_present (pgd_t pgd) { return 1; } | |
152 | static inline void pgd_clear (pgd_t *pgdp) {} | |
153 | ||
154 | ||
155 | #define pte_ERROR(e) \ | |
156 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
157 | #define pmd_ERROR(e) \ | |
158 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) | |
159 | #define pgd_ERROR(e) \ | |
160 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
161 | ||
162 | ||
163 | /* | |
164 | * The following only work if pte_present() is true. | |
165 | * Undefined behaviour if not... | |
166 | * [we have the full set here even if they don't change from m68k] | |
167 | */ | |
168 | static inline int pte_read(pte_t pte) { return 1; } | |
169 | static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } | |
170 | static inline int pte_exec(pte_t pte) { return 1; } | |
171 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } | |
172 | static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } | |
173 | static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } | |
174 | ||
175 | static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } | |
176 | static inline pte_t pte_rdprotect(pte_t pte) { return pte; } | |
177 | static inline pte_t pte_exprotect(pte_t pte) { return pte; } | |
178 | static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } | |
179 | static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } | |
180 | static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } | |
181 | static inline pte_t pte_mkread(pte_t pte) { return pte; } | |
182 | static inline pte_t pte_mkexec(pte_t pte) { return pte; } | |
183 | static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } | |
184 | static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } | |
185 | static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } | |
186 | // use this version when caches work... | |
187 | //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } | |
188 | // until then, use: | |
189 | static inline pte_t pte_mkcache(pte_t pte) { return pte; } | |
190 | ||
191 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
192 | extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; | |
193 | ||
194 | /* Find an entry in a pagetable directory. */ | |
195 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
196 | ||
197 | #define pgd_offset(mm, address) \ | |
198 | ((mm)->pgd + pgd_index(address)) | |
199 | ||
200 | /* Find an entry in a kernel pagetable directory. */ | |
201 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
202 | ||
203 | /* Find an entry in the second-level pagetable. */ | |
204 | static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address) | |
205 | { | |
206 | return (pmd_t *) pgd; | |
207 | } | |
208 | ||
209 | static inline unsigned long pte_to_pgoff(pte_t pte) | |
210 | { | |
211 | return pte.pte & SUN3_PAGE_PGNUM_MASK; | |
212 | } | |
213 | ||
214 | static inline pte_t pgoff_to_pte(inline unsigned off) | |
215 | { | |
216 | pte_t pte = { off + SUN3_PAGE_ACCESSED }; | |
217 | return pte; | |
218 | } | |
219 | ||
220 | ||
221 | /* Find an entry in the third-level pagetable. */ | |
222 | #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) | |
223 | #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address)) | |
224 | /* FIXME: should we bother with kmap() here? */ | |
225 | #define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address)) | |
226 | #define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address) | |
227 | #define pte_unmap(pte) kunmap(pte) | |
228 | #define pte_unmap_nested(pte) kunmap(pte) | |
229 | ||
230 | /* Macros to (de)construct the fake PTEs representing swap pages. */ | |
231 | #define __swp_type(x) ((x).val & 0x7F) | |
232 | #define __swp_offset(x) (((x).val) >> 7) | |
233 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) | |
234 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
235 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
236 | ||
237 | #endif /* !__ASSEMBLY__ */ | |
238 | #endif /* !_SUN3_PGTABLE_H */ |