File: /usr/src/linux/include/asm-m68k/motorola_pgtable.h
1 #ifndef _MOTOROLA_PGTABLE_H
2 #define _MOTOROLA_PGTABLE_H
3
4 #include <linux/config.h>
5
6 /*
7 * Definitions for MMU descriptors
8 */
9 #define _PAGE_PRESENT 0x001
10 #define _PAGE_SHORT 0x002
11 #define _PAGE_RONLY 0x004
12 #define _PAGE_ACCESSED 0x008
13 #define _PAGE_DIRTY 0x010
14 #define _PAGE_SUPER 0x080 /* 68040 supervisor only */
15 #define _PAGE_FAKE_SUPER 0x200 /* fake supervisor only on 680[23]0 */
16 #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
17 #define _PAGE_COW 0x800 /* implemented in software */
18 #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */
19 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
20 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
21 #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
22 #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
23
24 #define _DESCTYPE_MASK 0x003
25
26 #define _CACHEMASK040 (~0x060)
27 #define _TABLE_MASK (0xfffffe00)
28
29 #define _PAGE_TABLE (_PAGE_SHORT)
30 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
31
32 #ifndef __ASSEMBLY__
33
34 /* This is the cache mode to be used for pages containing page descriptors for
35 * processors >= '040. It is in pte_mknocache(), and the variable is defined
36 * and initialized in head.S */
37 extern int m68k_pgtable_cachemode;
38
39 /* This is the cache mode for normal pages, for supervisor access on
40 * processors >= '040. It is used in pte_mkcache(), and the variable is
41 * defined and initialized in head.S */
42
43 #if defined(CONFIG_060_WRITETHROUGH)
44 extern int m68k_supervisor_cachemode;
45 #else
46 #define m68k_supervisor_cachemode _PAGE_CACHE040
47 #endif
48
49 #if defined(CPU_M68040_OR_M68060_ONLY)
50 #define mm_cachebits _PAGE_CACHE040
51 #elif defined(CPU_M68020_OR_M68030_ONLY)
52 #define mm_cachebits 0
53 #else
54 extern unsigned long mm_cachebits;
55 #endif
56
57 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
58 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
59 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
60 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
61 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
62
63 /* Alternate definitions that are compile time constants, for
64 initializing protection_map. The cachebits are fixed later. */
65 #define PAGE_NONE_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
66 #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
67 #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
68 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
69
70 /*
71 * The m68k can't do page protection for execute, and considers that the same are read.
72 * Also, write permissions imply read permissions. This is the closest we can get..
73 */
74 #define __P000 PAGE_NONE_C
75 #define __P001 PAGE_READONLY_C
76 #define __P010 PAGE_COPY_C
77 #define __P011 PAGE_COPY_C
78 #define __P100 PAGE_READONLY_C
79 #define __P101 PAGE_READONLY_C
80 #define __P110 PAGE_COPY_C
81 #define __P111 PAGE_COPY_C
82
83 #define __S000 PAGE_NONE_C
84 #define __S001 PAGE_READONLY_C
85 #define __S010 PAGE_SHARED_C
86 #define __S011 PAGE_SHARED_C
87 #define __S100 PAGE_READONLY_C
88 #define __S101 PAGE_READONLY_C
89 #define __S110 PAGE_SHARED_C
90 #define __S111 PAGE_SHARED_C
91
92 /*
93 * Conversion functions: convert a page and protection to a page entry,
94 * and a page entry and page directory to the page they refer to.
95 */
96 #define __mk_pte(page, pgprot) \
97 ({ \
98 pte_t __pte; \
99 \
100 pte_val(__pte) = __pa(page) + pgprot_val(pgprot); \
101 __pte; \
102 })
103 #define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
104 #define mk_pte_phys(physpage, pgprot) \
105 ({ \
106 pte_t __pte; \
107 \
108 pte_val(__pte) = (physpage) + pgprot_val(pgprot); \
109 __pte; \
110 })
111
112 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
113 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
114
115 extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
116 {
117 unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
118 unsigned long *ptr = pmdp->pmd;
119 short i = 16;
120 while (--i >= 0) {
121 *ptr++ = ptbl;
122 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
123 }
124 }
125
126 extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
127 { pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); }
128
129 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
130 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
131 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
132
133
134 #define pte_none(pte) (!pte_val(pte))
135 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_FAKE_SUPER))
136 #define pte_clear(ptep) ({ pte_val(*(ptep)) = 0; })
137 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
138
139 #define pmd_none(pmd) (!pmd_val(pmd))
140 #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
141 #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
142 #define pmd_clear(pmdp) ({ \
143 unsigned long *__ptr = pmdp->pmd; \
144 short __i = 16; \
145 while (--__i >= 0) \
146 *__ptr++ = 0; \
147 })
148
149
150 #define pgd_none(pgd) (!pgd_val(pgd))
151 #define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
152 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE)
153 #define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; })
154 /* Permanent address of a page. */
155 #define page_address(page) ({ if (!(page)->virtual) BUG(); (page)->virtual; })
156 #define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
157 #define pte_page(pte) (mem_map+pte_pagenr(pte))
158
159 #define pte_ERROR(e) \
160 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
161 #define pmd_ERROR(e) \
162 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
163 #define pgd_ERROR(e) \
164 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
165
166
167 /*
168 * The following only work if pte_present() is true.
169 * Undefined behaviour if not..
170 */
171 extern inline int pte_read(pte_t pte) { return 1; }
172 extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
173 extern inline int pte_exec(pte_t pte) { return 1; }
174 extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
175 extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
176
177 extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
178 extern inline pte_t pte_rdprotect(pte_t pte) { return pte; }
179 extern inline pte_t pte_exprotect(pte_t pte) { return pte; }
180 extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
181 extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
182 extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
183 extern inline pte_t pte_mkread(pte_t pte) { return pte; }
184 extern inline pte_t pte_mkexec(pte_t pte) { return pte; }
185 extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
186 extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
187 extern inline pte_t pte_mknocache(pte_t pte)
188 {
189 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
190 return pte;
191 }
192 extern inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; }
193
194 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
195
196 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
197
198 /* to find an entry in a page-table-directory */
199 extern inline pgd_t * pgd_offset(struct mm_struct * mm, unsigned long address)
200 {
201 return mm->pgd + pgd_index(address);
202 }
203
204 #define swapper_pg_dir kernel_pg_dir
205 extern pgd_t kernel_pg_dir[128];
206
207 extern inline pgd_t * pgd_offset_k(unsigned long address)
208 {
209 return kernel_pg_dir + (address >> PGDIR_SHIFT);
210 }
211
212
213 /* Find an entry in the second-level page table.. */
214 extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
215 {
216 return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
217 }
218
219 /* Find an entry in the third-level page table.. */
220 extern inline pte_t * pte_offset(pmd_t * pmdp, unsigned long address)
221 {
222 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
223 }
224
225
226 /*
227 * Allocate and free page tables. The xxx_kernel() versions are
228 * used to allocate a kernel page table - this turns on ASN bits
229 * if any.
230 */
231
232 /* Prior to calling these routines, the page should have been flushed
233 * from both the cache and ATC, or the CPU might not notice that the
234 * cache setting for the page has been changed. -jskov
235 */
236 static inline void nocache_page (unsigned long vaddr)
237 {
238 if (CPU_IS_040_OR_060) {
239 pgd_t *dir;
240 pmd_t *pmdp;
241 pte_t *ptep;
242
243 dir = pgd_offset_k(vaddr);
244 pmdp = pmd_offset(dir,vaddr);
245 ptep = pte_offset(pmdp,vaddr);
246 *ptep = pte_mknocache(*ptep);
247 }
248 }
249
250 static inline void cache_page (unsigned long vaddr)
251 {
252 if (CPU_IS_040_OR_060) {
253 pgd_t *dir;
254 pmd_t *pmdp;
255 pte_t *ptep;
256
257 dir = pgd_offset_k(vaddr);
258 pmdp = pmd_offset(dir,vaddr);
259 ptep = pte_offset(pmdp,vaddr);
260 *ptep = pte_mkcache(*ptep);
261 }
262 }
263
264
265 #endif /* !__ASSEMBLY__ */
266 #endif /* _MOTOROLA_PGTABLE_H */
267