diff options
Diffstat (limited to 'arch/m68k/include/asm/sun3_pgtable.h')
-rw-r--r-- | arch/m68k/include/asm/sun3_pgtable.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h new file mode 100644 index 00000000000..f847ec732d6 --- /dev/null +++ b/arch/m68k/include/asm/sun3_pgtable.h | |||
@@ -0,0 +1,234 @@ | |||
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) virt_to_page(__pte_page(pte)) | ||
136 | #define pmd_page(pmd) virt_to_page(__pmd_page(pmd)) | ||
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_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } | ||
169 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } | ||
170 | static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } | ||
171 | static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } | ||
172 | static inline int pte_special(pte_t pte) { return 0; } | ||
173 | |||
174 | static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } | ||
175 | static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } | ||
176 | static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } | ||
177 | static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } | ||
178 | static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } | ||
179 | static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } | ||
180 | static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } | ||
181 | // use this version when caches work... | ||
182 | //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } | ||
183 | // until then, use: | ||
184 | static inline pte_t pte_mkcache(pte_t pte) { return pte; } | ||
185 | static inline pte_t pte_mkspecial(pte_t pte) { return pte; } | ||
186 | |||
187 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | ||
188 | extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; | ||
189 | |||
190 | /* Find an entry in a pagetable directory. */ | ||
191 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | ||
192 | |||
193 | #define pgd_offset(mm, address) \ | ||
194 | ((mm)->pgd + pgd_index(address)) | ||
195 | |||
196 | /* Find an entry in a kernel pagetable directory. */ | ||
197 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | ||
198 | |||
199 | /* Find an entry in the second-level pagetable. */ | ||
200 | static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address) | ||
201 | { | ||
202 | return (pmd_t *) pgd; | ||
203 | } | ||
204 | |||
205 | static inline unsigned long pte_to_pgoff(pte_t pte) | ||
206 | { | ||
207 | return pte.pte & SUN3_PAGE_PGNUM_MASK; | ||
208 | } | ||
209 | |||
210 | static inline pte_t pgoff_to_pte(unsigned off) | ||
211 | { | ||
212 | pte_t pte = { off + SUN3_PAGE_ACCESSED }; | ||
213 | return pte; | ||
214 | } | ||
215 | |||
216 | |||
217 | /* Find an entry in the third-level pagetable. */ | ||
218 | #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) | ||
219 | #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address)) | ||
220 | /* FIXME: should we bother with kmap() here? */ | ||
221 | #define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address)) | ||
222 | #define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address) | ||
223 | #define pte_unmap(pte) kunmap(pte) | ||
224 | #define pte_unmap_nested(pte) kunmap(pte) | ||
225 | |||
226 | /* Macros to (de)construct the fake PTEs representing swap pages. */ | ||
227 | #define __swp_type(x) ((x).val & 0x7F) | ||
228 | #define __swp_offset(x) (((x).val) >> 7) | ||
229 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) | ||
230 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | ||
231 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | ||
232 | |||
233 | #endif /* !__ASSEMBLY__ */ | ||
234 | #endif /* !_SUN3_PGTABLE_H */ | ||