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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _MOTOROLA_PGTABLE_H
2#define _MOTOROLA_PGTABLE_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5/*
6 * Definitions for MMU descriptors
7 */
8#define _PAGE_PRESENT 0x001
9#define _PAGE_SHORT 0x002
10#define _PAGE_RONLY 0x004
11#define _PAGE_ACCESSED 0x008
12#define _PAGE_DIRTY 0x010
13#define _PAGE_SUPER 0x080 /* 68040 supervisor only */
14#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
15#define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */
16#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
17#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
18#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
19#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
20
21#define _DESCTYPE_MASK 0x003
22
23#define _CACHEMASK040 (~0x060)
24#define _TABLE_MASK (0xfffffe00)
25
26#define _PAGE_TABLE (_PAGE_SHORT)
27#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
28
29#define _PAGE_PROTNONE 0x004
30#define _PAGE_FILE 0x008 /* pagecache or swap? */
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 */
37extern 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
50extern 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
58extern 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) pfn_pte(page_to_pfn(page), (pgprot))
101
102static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
103{
104 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
105 return pte;
106}
107
108static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
109{
110 unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
111 unsigned long *ptr = pmdp->pmd;
112 short i = 16;
113 while (--i >= 0) {
114 *ptr++ = ptbl;
115 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
116 }
117}
118
119static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
120{
121 pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
122}
123
124#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
125#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
126#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
127
128
129#define pte_none(pte) (!pte_val(pte))
130#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
131#define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; })
132
133#define pte_page(pte) (mem_map + ((unsigned long)(__va(pte_val(pte)) - PAGE_OFFSET) >> PAGE_SHIFT))
134#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
135#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
136
137#define pmd_none(pmd) (!pmd_val(pmd))
138#define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
139#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
140#define pmd_clear(pmdp) ({ \
141 unsigned long *__ptr = pmdp->pmd; \
142 short __i = 16; \
143 while (--__i >= 0) \
144 *__ptr++ = 0; \
145})
146#define pmd_page(pmd) (mem_map + ((unsigned long)(__va(pmd_val(pmd)) - PAGE_OFFSET) >> PAGE_SHIFT))
147
148
149#define pgd_none(pgd) (!pgd_val(pgd))
150#define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
151#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE)
152#define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; })
Dave McCracken46a82b22006-09-25 23:31:48 -0700153#define pgd_page(pgd) (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
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 */
167static inline int pte_read(pte_t pte) { return 1; }
168static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
169static inline int pte_exec(pte_t pte) { return 1; }
170static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
171static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
172static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
173
174static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
175static inline pte_t pte_rdprotect(pte_t pte) { return pte; }
176static inline pte_t pte_exprotect(pte_t pte) { return pte; }
177static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
178static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
179static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
180static inline pte_t pte_mkread(pte_t pte) { return pte; }
181static inline pte_t pte_mkexec(pte_t pte) { return pte; }
182static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
183static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
184static inline pte_t pte_mknocache(pte_t pte)
185{
186 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
187 return pte;
188}
189static inline pte_t pte_mkcache(pte_t pte)
190{
191 pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
192 return pte;
193}
194
195#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
196
197#define pgd_index(address) ((address) >> PGDIR_SHIFT)
198
199/* to find an entry in a page-table-directory */
200static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
201{
202 return mm->pgd + pgd_index(address);
203}
204
205#define swapper_pg_dir kernel_pg_dir
206extern pgd_t kernel_pg_dir[128];
207
208static inline pgd_t *pgd_offset_k(unsigned long address)
209{
210 return kernel_pg_dir + (address >> PGDIR_SHIFT);
211}
212
213
214/* Find an entry in the second-level page table.. */
215static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
216{
217 return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
218}
219
220/* Find an entry in the third-level page table.. */
221static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
222{
223 return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
224}
225
226#define pte_offset_map(pmdp,address) ((pte_t *)kmap(pmd_page(*pmdp)) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
227#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
228#define pte_unmap(pte) kunmap(pte)
229#define pte_unmap_nested(pte) kunmap(pte)
230
231/*
232 * Allocate and free page tables. The xxx_kernel() versions are
233 * used to allocate a kernel page table - this turns on ASN bits
234 * if any.
235 */
236
237/* Prior to calling these routines, the page should have been flushed
238 * from both the cache and ATC, or the CPU might not notice that the
239 * cache setting for the page has been changed. -jskov
240 */
241static inline void nocache_page(void *vaddr)
242{
243 unsigned long addr = (unsigned long)vaddr;
244
245 if (CPU_IS_040_OR_060) {
246 pgd_t *dir;
247 pmd_t *pmdp;
248 pte_t *ptep;
249
250 dir = pgd_offset_k(addr);
251 pmdp = pmd_offset(dir, addr);
252 ptep = pte_offset_kernel(pmdp, addr);
253 *ptep = pte_mknocache(*ptep);
254 }
255}
256
257static inline void cache_page(void *vaddr)
258{
259 unsigned long addr = (unsigned long)vaddr;
260
261 if (CPU_IS_040_OR_060) {
262 pgd_t *dir;
263 pmd_t *pmdp;
264 pte_t *ptep;
265
266 dir = pgd_offset_k(addr);
267 pmdp = pmd_offset(dir, addr);
268 ptep = pte_offset_kernel(pmdp, addr);
269 *ptep = pte_mkcache(*ptep);
270 }
271}
272
273#define PTE_FILE_MAX_BITS 28
274
275static inline unsigned long pte_to_pgoff(pte_t pte)
276{
277 return pte.pte >> 4;
278}
279
280static inline pte_t pgoff_to_pte(unsigned off)
281{
282 pte_t pte = { (off << 4) + _PAGE_FILE };
283 return pte;
284}
285
286/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
287#define __swp_type(x) (((x).val >> 4) & 0xff)
288#define __swp_offset(x) ((x).val >> 12)
289#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
290#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
291#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
292
293#endif /* !__ASSEMBLY__ */
294#endif /* _MOTOROLA_PGTABLE_H */