File: /usr/src/linux/include/asm-m68k/sun3_pgtable.h
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) \
103 ({ pte_t __pte; pte_val(__pte) = (__pa(page) >> PAGE_SHIFT) | pgprot_val(pgprot); __pte; })
104 #define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
105 #define mk_pte_phys(physpage, pgprot) \
106 ({ pte_t __pte; pte_val(__pte) = ((physpage) >> PAGE_SHIFT) | pgprot_val(pgprot); __pte; })
107 extern inline pte_t pte_modify (pte_t pte, pgprot_t newprot)
108 { pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
109
110 #define pmd_set(pmdp,ptep) do {} while (0)
111
112 extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
113 { pgd_val(*pgdp) = virt_to_phys(pmdp); }
114
115 #define __pte_page(pte) \
116 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
117 #define __pmd_page(pmd) \
118 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
119
120 extern inline int pte_none (pte_t pte) { return !pte_val (pte); }
121 extern inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
122 extern inline void pte_clear (pte_t *ptep) { pte_val (*ptep) = 0; }
123
124 /* FIXME: this is only a guess */
125 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
126 /* Permanent address of a page. */
127 #define page_address(page) ({ if (!(page)->virtual) BUG(); (page)->virtual; })
128 #define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
129 #define pte_page(pte) (mem_map+pte_pagenr(pte))
130
131
132 extern inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
133 #define pmd_none(pmd) pmd_none2(&(pmd))
134 //extern inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
135 extern inline int pmd_bad2 (pmd_t *pmd) { return 0; }
136 #define pmd_bad(pmd) pmd_bad2(&(pmd))
137 extern inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
138 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
139 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
140 extern inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
141
142 extern inline int pgd_none (pgd_t pgd) { return 0; }
143 extern inline int pgd_bad (pgd_t pgd) { return 0; }
144 extern inline int pgd_present (pgd_t pgd) { return 1; }
145 extern inline void pgd_clear (pgd_t *pgdp) {}
146
147
148 #define pte_ERROR(e) \
149 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
150 #define pmd_ERROR(e) \
151 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
152 #define pgd_ERROR(e) \
153 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
154
155
156 /*
157 * The following only work if pte_present() is true.
158 * Undefined behaviour if not...
159 * [we have the full set here even if they don't change from m68k]
160 */
161 extern inline int pte_read(pte_t pte) { return 1; }
162 extern inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
163 extern inline int pte_exec(pte_t pte) { return 1; }
164 extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
165 extern inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
166
167 extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
168 extern inline pte_t pte_rdprotect(pte_t pte) { return pte; }
169 extern inline pte_t pte_exprotect(pte_t pte) { return pte; }
170 extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
171 extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
172 extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
173 extern inline pte_t pte_mkread(pte_t pte) { return pte; }
174 extern inline pte_t pte_mkexec(pte_t pte) { return pte; }
175 extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
176 extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
177 extern inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
178 // use this version when caches work...
179 //extern inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
180 // until then, use:
181 extern inline pte_t pte_mkcache(pte_t pte) { return pte; }
182
183 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
184 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
185
186 /* Find an entry in a pagetable directory. */
187 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
188
189 #define pgd_offset(mm, address) \
190 ((mm)->pgd + pgd_index(address))
191
192 /* Find an entry in a kernel pagetable directory. */
193 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
194
195 /* Find an entry in the second-level pagetable. */
196 extern inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
197 {
198 return (pmd_t *) pgd;
199 }
200
201 /* Find an entry in the third-level pagetable. */
202 #define pte_offset(pmd, address) \
203 ((pte_t *) __pmd_page (*pmd) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)))
204
205 /* Disable caching for page at given kernel virtual address. */
206 static inline void nocache_page (unsigned long vaddr)
207 {
208 /* Don't think this is required on sun3. --m */
209 }
210
211 /* Enable caching for page at given kernel virtual address. */
212 static inline void cache_page (unsigned long vaddr)
213 {
214 /* Don't think this is required on sun3. --m */
215 }
216
217
218
219 #endif /* !__ASSEMBLY__ */
220 #endif /* !_SUN3_PGTABLE_H */
221