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_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
16 #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */
17 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
18 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
19 #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
20 #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
21
22 #define _DESCTYPE_MASK 0x003
23
24 #define _CACHEMASK040 (~0x060)
25 #define _TABLE_MASK (0xfffffe00)
26
27 #define _PAGE_TABLE (_PAGE_SHORT)
28 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
29
30 #define _PAGE_PROTNONE 0x004
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(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
44 #define m68k_supervisor_cachemode _PAGE_CACHE040W
45 #elif defined(CPU_M68040_OR_M68060_ONLY)
46 #define m68k_supervisor_cachemode _PAGE_CACHE040
47 #elif defined(CPU_M68020_OR_M68030_ONLY)
48 #define m68k_supervisor_cachemode 0
49 #else
50 extern int m68k_supervisor_cachemode;
51 #endif
52
53 #if defined(CPU_M68040_OR_M68060_ONLY)
54 #define mm_cachebits _PAGE_CACHE040
55 #elif defined(CPU_M68020_OR_M68030_ONLY)
56 #define mm_cachebits 0
57 #else
58 extern unsigned long mm_cachebits;
59 #endif
60
61 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
62 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
63 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
64 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
65 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
66
67 /* Alternate definitions that are compile time constants, for
68 initializing protection_map. The cachebits are fixed later. */
69 #define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
70 #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
71 #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
72 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
73
74 /*
75 * The m68k can't do page protection for execute, and considers that the same are read.
76 * Also, write permissions imply read permissions. This is the closest we can get..
77 */
78 #define __P000 PAGE_NONE_C
79 #define __P001 PAGE_READONLY_C
80 #define __P010 PAGE_COPY_C
81 #define __P011 PAGE_COPY_C
82 #define __P100 PAGE_READONLY_C
83 #define __P101 PAGE_READONLY_C
84 #define __P110 PAGE_COPY_C
85 #define __P111 PAGE_COPY_C
86
87 #define __S000 PAGE_NONE_C
88 #define __S001 PAGE_READONLY_C
89 #define __S010 PAGE_SHARED_C
90 #define __S011 PAGE_SHARED_C
91 #define __S100 PAGE_READONLY_C
92 #define __S101 PAGE_READONLY_C
93 #define __S110 PAGE_SHARED_C
94 #define __S111 PAGE_SHARED_C
95
96 /*
97 * Conversion functions: convert a page and protection to a page entry,
98 * and a page entry and page directory to the page they refer to.
99 */
100 #define __mk_pte(page, pgprot) \
101 ({ \
102 pte_t __pte; \
103 \
104 pte_val(__pte) = __pa(page) + pgprot_val(pgprot); \
105 __pte; \
106 })
107 #define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
108 #define mk_pte_phys(physpage, pgprot) \
109 ({ \
110 pte_t __pte; \
111 \
112 pte_val(__pte) = (physpage) + pgprot_val(pgprot); \
113 __pte; \
114 })
115
pte_modify(pte_t pte,pgprot_t newprot)116 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
117 {
118 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
119 return pte;
120 }
121
pmd_set(pmd_t * pmdp,pte_t * ptep)122 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
123 {
124 unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
125 unsigned long *ptr = pmdp->pmd;
126 short i = 16;
127 while (--i >= 0) {
128 *ptr++ = ptbl;
129 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
130 }
131 }
132
pgd_set(pgd_t * pgdp,pmd_t * pmdp)133 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
134 {
135 pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
136 }
137
138 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
139 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
140 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
141
142
143 #define pte_none(pte) (!pte_val(pte))
144 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
145 #define pte_clear(ptep) ({ pte_val(*(ptep)) = 0; })
146 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
147
148 #define pmd_none(pmd) (!pmd_val(pmd))
149 #define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
150 #define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
151 #define pmd_clear(pmdp) ({ \
152 unsigned long *__ptr = pmdp->pmd; \
153 short __i = 16; \
154 while (--__i >= 0) \
155 *__ptr++ = 0; \
156 })
157
158
159 #define pgd_none(pgd) (!pgd_val(pgd))
160 #define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
161 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE)
162 #define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; })
163 #define pte_page(pte) (mem_map+pte_pagenr(pte))
164
165 #define pte_ERROR(e) \
166 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
167 #define pmd_ERROR(e) \
168 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
169 #define pgd_ERROR(e) \
170 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
171
172
173 /*
174 * The following only work if pte_present() is true.
175 * Undefined behaviour if not..
176 */
pte_read(pte_t pte)177 static inline int pte_read(pte_t pte) { return 1; }
pte_write(pte_t pte)178 static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
pte_exec(pte_t pte)179 static inline int pte_exec(pte_t pte) { return 1; }
pte_dirty(pte_t pte)180 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
pte_young(pte_t pte)181 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
182
pte_wrprotect(pte_t pte)183 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
pte_rdprotect(pte_t pte)184 static inline pte_t pte_rdprotect(pte_t pte) { return pte; }
pte_exprotect(pte_t pte)185 static inline pte_t pte_exprotect(pte_t pte) { return pte; }
pte_mkclean(pte_t pte)186 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
pte_mkold(pte_t pte)187 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
pte_mkwrite(pte_t pte)188 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
pte_mkread(pte_t pte)189 static inline pte_t pte_mkread(pte_t pte) { return pte; }
pte_mkexec(pte_t pte)190 static inline pte_t pte_mkexec(pte_t pte) { return pte; }
pte_mkdirty(pte_t pte)191 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
pte_mkyoung(pte_t pte)192 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
pte_mknocache(pte_t pte)193 static inline pte_t pte_mknocache(pte_t pte)
194 {
195 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
196 return pte;
197 }
pte_mkcache(pte_t pte)198 static inline pte_t pte_mkcache(pte_t pte)
199 {
200 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
201 return pte;
202 }
203
204 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
205
206 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
207
208 /* to find an entry in a page-table-directory */
pgd_offset(struct mm_struct * mm,unsigned long address)209 static inline pgd_t * pgd_offset(struct mm_struct * mm, unsigned long address)
210 {
211 return mm->pgd + pgd_index(address);
212 }
213
214 #define swapper_pg_dir kernel_pg_dir
215 extern pgd_t kernel_pg_dir[128];
216
pgd_offset_k(unsigned long address)217 static inline pgd_t *pgd_offset_k(unsigned long address)
218 {
219 return kernel_pg_dir + (address >> PGDIR_SHIFT);
220 }
221
222
223 /* Find an entry in the second-level page table.. */
pmd_offset(pgd_t * dir,unsigned long address)224 static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
225 {
226 return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
227 }
228
229 /* Find an entry in the third-level page table.. */
pte_offset(pmd_t * pmdp,unsigned long address)230 static inline pte_t *pte_offset(pmd_t *pmdp, unsigned long address)
231 {
232 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
233 }
234
235
236 /*
237 * Allocate and free page tables. The xxx_kernel() versions are
238 * used to allocate a kernel page table - this turns on ASN bits
239 * if any.
240 */
241
242 /* Prior to calling these routines, the page should have been flushed
243 * from both the cache and ATC, or the CPU might not notice that the
244 * cache setting for the page has been changed. -jskov
245 */
nocache_page(unsigned long vaddr)246 static inline void nocache_page (unsigned long vaddr)
247 {
248 if (CPU_IS_040_OR_060) {
249 pgd_t *dir;
250 pmd_t *pmdp;
251 pte_t *ptep;
252
253 dir = pgd_offset_k(vaddr);
254 pmdp = pmd_offset(dir,vaddr);
255 ptep = pte_offset(pmdp,vaddr);
256 *ptep = pte_mknocache(*ptep);
257 }
258 }
259
cache_page(unsigned long vaddr)260 static inline void cache_page (unsigned long vaddr)
261 {
262 if (CPU_IS_040_OR_060) {
263 pgd_t *dir;
264 pmd_t *pmdp;
265 pte_t *ptep;
266
267 dir = pgd_offset_k(vaddr);
268 pmdp = pmd_offset(dir,vaddr);
269 ptep = pte_offset(pmdp,vaddr);
270 *ptep = pte_mkcache(*ptep);
271 }
272 }
273
274
275 #endif /* !__ASSEMBLY__ */
276 #endif /* _MOTOROLA_PGTABLE_H */
277