1 #ifndef _MCF_PGTABLE_H
2 #define _MCF_PGTABLE_H
3 
4 #include <asm/mcfmmu.h>
5 #include <asm/page.h>
6 
7 /*
8  * MMUDR bits, in proper place. We write these directly into the MMUDR
9  * after masking from the pte.
10  */
11 #define CF_PAGE_LOCKED		MMUDR_LK	/* 0x00000002 */
12 #define CF_PAGE_EXEC		MMUDR_X		/* 0x00000004 */
13 #define CF_PAGE_WRITABLE	MMUDR_W		/* 0x00000008 */
14 #define CF_PAGE_READABLE	MMUDR_R		/* 0x00000010 */
15 #define CF_PAGE_SYSTEM		MMUDR_SP	/* 0x00000020 */
16 #define CF_PAGE_COPYBACK	MMUDR_CM_CCB	/* 0x00000040 */
17 #define CF_PAGE_NOCACHE		MMUDR_CM_NCP	/* 0x00000080 */
18 
19 #define CF_CACHEMASK		(~MMUDR_CM_CCB)
20 #define CF_PAGE_MMUDR_MASK	0x000000fe
21 
22 #define _PAGE_NOCACHE030	CF_PAGE_NOCACHE
23 
24 /*
25  * MMUTR bits, need shifting down.
26  */
27 #define CF_PAGE_MMUTR_MASK	0x00000c00
28 #define CF_PAGE_MMUTR_SHIFT	10
29 
30 #define CF_PAGE_VALID		(MMUTR_V << CF_PAGE_MMUTR_SHIFT)
31 #define CF_PAGE_SHARED		(MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
32 
33 /*
34  * Fake bits, not implemented in CF, will get masked out before
35  * hitting hardware.
36  */
37 #define CF_PAGE_DIRTY		0x00000001
38 #define CF_PAGE_ACCESSED	0x00001000
39 
40 #define _PAGE_CACHE040		0x020   /* 68040 cache mode, cachable, copyback */
41 #define _PAGE_NOCACHE_S		0x040   /* 68040 no-cache mode, serialized */
42 #define _PAGE_NOCACHE		0x060   /* 68040 cache mode, non-serialized */
43 #define _PAGE_CACHE040W		0x000   /* 68040 cache mode, cachable, write-through */
44 #define _DESCTYPE_MASK		0x003
45 #define _CACHEMASK040		(~0x060)
46 #define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */
47 
48 /*
49  * Externally used page protection values.
50  */
51 #define _PAGE_PRESENT	(CF_PAGE_VALID)
52 #define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
53 #define _PAGE_DIRTY	(CF_PAGE_DIRTY)
54 #define _PAGE_READWRITE (CF_PAGE_READABLE \
55 				| CF_PAGE_WRITABLE \
56 				| CF_PAGE_SYSTEM \
57 				| CF_PAGE_SHARED)
58 
59 /*
60  * Compound page protection values.
61  */
62 #define PAGE_NONE	__pgprot(CF_PAGE_VALID \
63 				 | CF_PAGE_ACCESSED)
64 
65 #define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
66 				 | CF_PAGE_ACCESSED \
67 				 | CF_PAGE_SHARED)
68 
69 #define PAGE_INIT	__pgprot(CF_PAGE_VALID \
70 				 | CF_PAGE_READABLE \
71 				 | CF_PAGE_WRITABLE \
72 				 | CF_PAGE_EXEC \
73 				 | CF_PAGE_SYSTEM)
74 
75 #define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
76 				 | CF_PAGE_ACCESSED \
77 				 | CF_PAGE_READABLE \
78 				 | CF_PAGE_WRITABLE \
79 				 | CF_PAGE_EXEC \
80 				 | CF_PAGE_SYSTEM \
81 				 | CF_PAGE_SHARED)
82 
83 #define PAGE_COPY	__pgprot(CF_PAGE_VALID \
84 				 | CF_PAGE_ACCESSED \
85 				 | CF_PAGE_READABLE \
86 				 | CF_PAGE_DIRTY)
87 
88 /*
89  * Page protections for initialising protection_map. See mm/mmap.c
90  * for use. In general, the bit positions are xwr, and P-items are
91  * private, the S-items are shared.
92  */
93 #define __P000		PAGE_NONE
94 #define __P001		__pgprot(CF_PAGE_VALID \
95 				 | CF_PAGE_ACCESSED \
96 				 | CF_PAGE_READABLE)
97 #define __P010		__pgprot(CF_PAGE_VALID \
98 				 | CF_PAGE_ACCESSED \
99 				 | CF_PAGE_WRITABLE)
100 #define __P011		__pgprot(CF_PAGE_VALID \
101 				 | CF_PAGE_ACCESSED \
102 				 | CF_PAGE_READABLE \
103 				 | CF_PAGE_WRITABLE)
104 #define __P100		__pgprot(CF_PAGE_VALID \
105 				 | CF_PAGE_ACCESSED \
106 				 | CF_PAGE_EXEC)
107 #define __P101		__pgprot(CF_PAGE_VALID \
108 				 | CF_PAGE_ACCESSED \
109 				 | CF_PAGE_READABLE \
110 				 | CF_PAGE_EXEC)
111 #define __P110		__pgprot(CF_PAGE_VALID \
112 				 | CF_PAGE_ACCESSED \
113 				 | CF_PAGE_WRITABLE \
114 				 | CF_PAGE_EXEC)
115 #define __P111		__pgprot(CF_PAGE_VALID \
116 				 | CF_PAGE_ACCESSED \
117 				 | CF_PAGE_READABLE \
118 				 | CF_PAGE_WRITABLE \
119 				 | CF_PAGE_EXEC)
120 
121 #define __S000		PAGE_NONE
122 #define __S001		__pgprot(CF_PAGE_VALID \
123 				 | CF_PAGE_ACCESSED \
124 				 | CF_PAGE_READABLE)
125 #define __S010		PAGE_SHARED
126 #define __S011		__pgprot(CF_PAGE_VALID \
127 				 | CF_PAGE_ACCESSED \
128 				 | CF_PAGE_SHARED \
129 				 | CF_PAGE_READABLE)
130 #define __S100		__pgprot(CF_PAGE_VALID \
131 				 | CF_PAGE_ACCESSED \
132 				 | CF_PAGE_EXEC)
133 #define __S101		__pgprot(CF_PAGE_VALID \
134 				 | CF_PAGE_ACCESSED \
135 				 | CF_PAGE_READABLE \
136 				 | CF_PAGE_EXEC)
137 #define __S110		__pgprot(CF_PAGE_VALID \
138 				 | CF_PAGE_ACCESSED \
139 				 | CF_PAGE_SHARED \
140 				 | CF_PAGE_EXEC)
141 #define __S111		__pgprot(CF_PAGE_VALID \
142 				 | CF_PAGE_ACCESSED \
143 				 | CF_PAGE_SHARED \
144 				 | CF_PAGE_READABLE \
145 				 | CF_PAGE_EXEC)
146 
147 #define PTE_MASK	PAGE_MASK
148 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
149 
150 #ifndef __ASSEMBLY__
151 
152 /*
153  * Conversion functions: convert a page and protection to a page entry,
154  * and a page entry and page directory to the page they refer to.
155  */
156 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
157 
158 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
159 {
160 	pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
161 	return pte;
162 }
163 
164 #define pmd_set(pmdp, ptep) do {} while (0)
165 
166 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
167 {
168 	pgd_val(*pgdp) = virt_to_phys(pmdp);
169 }
170 
171 #define __pte_page(pte)	((unsigned long) (pte_val(pte) & PAGE_MASK))
172 #define __pmd_page(pmd)	((unsigned long) (pmd_val(pmd)))
173 
174 static inline int pte_none(pte_t pte)
175 {
176 	return !pte_val(pte);
177 }
178 
179 static inline int pte_present(pte_t pte)
180 {
181 	return pte_val(pte) & CF_PAGE_VALID;
182 }
183 
184 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
185 	pte_t *ptep)
186 {
187 	pte_val(*ptep) = 0;
188 }
189 
190 #define pte_pagenr(pte)	((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
191 #define pte_page(pte)	virt_to_page(__pte_page(pte))
192 
193 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
194 #define pmd_none(pmd) pmd_none2(&(pmd))
195 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
196 #define pmd_bad(pmd) pmd_bad2(&(pmd))
197 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
198 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
199 
200 static inline int pgd_none(pgd_t pgd) { return 0; }
201 static inline int pgd_bad(pgd_t pgd) { return 0; }
202 static inline int pgd_present(pgd_t pgd) { return 1; }
203 static inline void pgd_clear(pgd_t *pgdp) {}
204 
205 #define pte_ERROR(e) \
206 	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
207 	__FILE__, __LINE__, pte_val(e))
208 #define pmd_ERROR(e) \
209 	printk(KERN_ERR "%s:%d: bad pmd %08lx.\n",	\
210 	__FILE__, __LINE__, pmd_val(e))
211 #define pgd_ERROR(e) \
212 	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
213 	__FILE__, __LINE__, pgd_val(e))
214 
215 /*
216  * The following only work if pte_present() is true.
217  * Undefined behaviour if not...
218  * [we have the full set here even if they don't change from m68k]
219  */
220 static inline int pte_read(pte_t pte)
221 {
222 	return pte_val(pte) & CF_PAGE_READABLE;
223 }
224 
225 static inline int pte_write(pte_t pte)
226 {
227 	return pte_val(pte) & CF_PAGE_WRITABLE;
228 }
229 
230 static inline int pte_exec(pte_t pte)
231 {
232 	return pte_val(pte) & CF_PAGE_EXEC;
233 }
234 
235 static inline int pte_dirty(pte_t pte)
236 {
237 	return pte_val(pte) & CF_PAGE_DIRTY;
238 }
239 
240 static inline int pte_young(pte_t pte)
241 {
242 	return pte_val(pte) & CF_PAGE_ACCESSED;
243 }
244 
245 static inline int pte_special(pte_t pte)
246 {
247 	return 0;
248 }
249 
250 static inline pte_t pte_wrprotect(pte_t pte)
251 {
252 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
253 	return pte;
254 }
255 
256 static inline pte_t pte_rdprotect(pte_t pte)
257 {
258 	pte_val(pte) &= ~CF_PAGE_READABLE;
259 	return pte;
260 }
261 
262 static inline pte_t pte_exprotect(pte_t pte)
263 {
264 	pte_val(pte) &= ~CF_PAGE_EXEC;
265 	return pte;
266 }
267 
268 static inline pte_t pte_mkclean(pte_t pte)
269 {
270 	pte_val(pte) &= ~CF_PAGE_DIRTY;
271 	return pte;
272 }
273 
274 static inline pte_t pte_mkold(pte_t pte)
275 {
276 	pte_val(pte) &= ~CF_PAGE_ACCESSED;
277 	return pte;
278 }
279 
280 static inline pte_t pte_mkwrite(pte_t pte)
281 {
282 	pte_val(pte) |= CF_PAGE_WRITABLE;
283 	return pte;
284 }
285 
286 static inline pte_t pte_mkread(pte_t pte)
287 {
288 	pte_val(pte) |= CF_PAGE_READABLE;
289 	return pte;
290 }
291 
292 static inline pte_t pte_mkexec(pte_t pte)
293 {
294 	pte_val(pte) |= CF_PAGE_EXEC;
295 	return pte;
296 }
297 
298 static inline pte_t pte_mkdirty(pte_t pte)
299 {
300 	pte_val(pte) |= CF_PAGE_DIRTY;
301 	return pte;
302 }
303 
304 static inline pte_t pte_mkyoung(pte_t pte)
305 {
306 	pte_val(pte) |= CF_PAGE_ACCESSED;
307 	return pte;
308 }
309 
310 static inline pte_t pte_mknocache(pte_t pte)
311 {
312 	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
313 	return pte;
314 }
315 
316 static inline pte_t pte_mkcache(pte_t pte)
317 {
318 	pte_val(pte) &= ~CF_PAGE_NOCACHE;
319 	return pte;
320 }
321 
322 static inline pte_t pte_mkspecial(pte_t pte)
323 {
324 	return pte;
325 }
326 
327 #define swapper_pg_dir kernel_pg_dir
328 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
329 
330 /*
331  * Find an entry in a pagetable directory.
332  */
333 #define pgd_index(address)	((address) >> PGDIR_SHIFT)
334 #define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))
335 
336 /*
337  * Find an entry in a kernel pagetable directory.
338  */
339 #define pgd_offset_k(address)	pgd_offset(&init_mm, address)
340 
341 /*
342  * Find an entry in the second-level pagetable.
343  */
344 static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
345 {
346 	return (pmd_t *) pgd;
347 }
348 
349 /*
350  * Find an entry in the third-level pagetable.
351  */
352 #define __pte_offset(address)	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
353 #define pte_offset_kernel(dir, address) \
354 	((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
355 
356 /*
357  * Disable caching for page at given kernel virtual address.
358  */
359 static inline void nocache_page(void *vaddr)
360 {
361 	pgd_t *dir;
362 	pmd_t *pmdp;
363 	pte_t *ptep;
364 	unsigned long addr = (unsigned long) vaddr;
365 
366 	dir = pgd_offset_k(addr);
367 	pmdp = pmd_offset(dir, addr);
368 	ptep = pte_offset_kernel(pmdp, addr);
369 	*ptep = pte_mknocache(*ptep);
370 }
371 
372 /*
373  * Enable caching for page at given kernel virtual address.
374  */
375 static inline void cache_page(void *vaddr)
376 {
377 	pgd_t *dir;
378 	pmd_t *pmdp;
379 	pte_t *ptep;
380 	unsigned long addr = (unsigned long) vaddr;
381 
382 	dir = pgd_offset_k(addr);
383 	pmdp = pmd_offset(dir, addr);
384 	ptep = pte_offset_kernel(pmdp, addr);
385 	*ptep = pte_mkcache(*ptep);
386 }
387 
388 /*
389  * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
390  */
391 #define __swp_type(x)		((x).val & 0xFF)
392 #define __swp_offset(x)		((x).val >> 11)
393 #define __swp_entry(typ, off)	((swp_entry_t) { (typ) | \
394 					(off << 11) })
395 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
396 #define __swp_entry_to_pte(x)	(__pte((x).val))
397 
398 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
399 
400 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
401 				       __pte_offset(addr))
402 #define pte_unmap(pte)		((void) 0)
403 #define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
404 #define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
405 
406 #endif	/* !__ASSEMBLY__ */
407 #endif	/* _MCF_PGTABLE_H */
408