1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _MCF_PGTABLE_H
3 #define _MCF_PGTABLE_H
4
5 #include <asm/mcfmmu.h>
6 #include <asm/page.h>
7
8 /*
9 * MMUDR bits, in proper place. We write these directly into the MMUDR
10 * after masking from the pte.
11 */
12 #define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */
13 #define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */
14 #define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */
15 #define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */
16 #define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */
17 #define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */
18 #define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */
19
20 #define CF_CACHEMASK (~MMUDR_CM_CCB)
21 #define CF_PAGE_MMUDR_MASK 0x000000fe
22
23 #define _PAGE_NOCACHE030 CF_PAGE_NOCACHE
24
25 /*
26 * MMUTR bits, need shifting down.
27 */
28 #define CF_PAGE_MMUTR_MASK 0x00000c00
29 #define CF_PAGE_MMUTR_SHIFT 10
30
31 #define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
32 #define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
33
34 /*
35 * Fake bits, not implemented in CF, will get masked out before
36 * hitting hardware.
37 */
38 #define CF_PAGE_DIRTY 0x00000001
39 #define CF_PAGE_ACCESSED 0x00001000
40
41 #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
42 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
43 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
44 #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
45 #define _DESCTYPE_MASK 0x003
46 #define _CACHEMASK040 (~0x060)
47 #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
48
49 /*
50 * Externally used page protection values.
51 */
52 #define _PAGE_PRESENT (CF_PAGE_VALID)
53 #define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
54 #define _PAGE_DIRTY (CF_PAGE_DIRTY)
55 #define _PAGE_READWRITE (CF_PAGE_READABLE \
56 | CF_PAGE_WRITABLE \
57 | CF_PAGE_SYSTEM \
58 | CF_PAGE_SHARED)
59
60 /*
61 * Compound page protection values.
62 */
63 #define PAGE_NONE __pgprot(CF_PAGE_VALID \
64 | CF_PAGE_ACCESSED)
65
66 #define PAGE_SHARED __pgprot(CF_PAGE_VALID \
67 | CF_PAGE_ACCESSED \
68 | CF_PAGE_SHARED)
69
70 #define PAGE_INIT __pgprot(CF_PAGE_VALID \
71 | CF_PAGE_READABLE \
72 | CF_PAGE_WRITABLE \
73 | CF_PAGE_EXEC \
74 | CF_PAGE_SYSTEM)
75
76 #define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
77 | CF_PAGE_ACCESSED \
78 | CF_PAGE_READABLE \
79 | CF_PAGE_WRITABLE \
80 | CF_PAGE_EXEC \
81 | CF_PAGE_SYSTEM \
82 | CF_PAGE_SHARED)
83
84 #define PAGE_COPY __pgprot(CF_PAGE_VALID \
85 | CF_PAGE_ACCESSED \
86 | CF_PAGE_READABLE \
87 | CF_PAGE_DIRTY)
88
89 /*
90 * Page protections for initialising protection_map. See mm/mmap.c
91 * for use. In general, the bit positions are xwr, and P-items are
92 * private, the S-items are shared.
93 */
94 #define __P000 PAGE_NONE
95 #define __P001 __pgprot(CF_PAGE_VALID \
96 | CF_PAGE_ACCESSED \
97 | CF_PAGE_READABLE)
98 #define __P010 __pgprot(CF_PAGE_VALID \
99 | CF_PAGE_ACCESSED \
100 | CF_PAGE_WRITABLE)
101 #define __P011 __pgprot(CF_PAGE_VALID \
102 | CF_PAGE_ACCESSED \
103 | CF_PAGE_READABLE \
104 | CF_PAGE_WRITABLE)
105 #define __P100 __pgprot(CF_PAGE_VALID \
106 | CF_PAGE_ACCESSED \
107 | CF_PAGE_EXEC)
108 #define __P101 __pgprot(CF_PAGE_VALID \
109 | CF_PAGE_ACCESSED \
110 | CF_PAGE_READABLE \
111 | CF_PAGE_EXEC)
112 #define __P110 __pgprot(CF_PAGE_VALID \
113 | CF_PAGE_ACCESSED \
114 | CF_PAGE_WRITABLE \
115 | CF_PAGE_EXEC)
116 #define __P111 __pgprot(CF_PAGE_VALID \
117 | CF_PAGE_ACCESSED \
118 | CF_PAGE_READABLE \
119 | CF_PAGE_WRITABLE \
120 | CF_PAGE_EXEC)
121
122 #define __S000 PAGE_NONE
123 #define __S001 __pgprot(CF_PAGE_VALID \
124 | CF_PAGE_ACCESSED \
125 | CF_PAGE_READABLE)
126 #define __S010 PAGE_SHARED
127 #define __S011 __pgprot(CF_PAGE_VALID \
128 | CF_PAGE_ACCESSED \
129 | CF_PAGE_SHARED \
130 | CF_PAGE_READABLE)
131 #define __S100 __pgprot(CF_PAGE_VALID \
132 | CF_PAGE_ACCESSED \
133 | CF_PAGE_EXEC)
134 #define __S101 __pgprot(CF_PAGE_VALID \
135 | CF_PAGE_ACCESSED \
136 | CF_PAGE_READABLE \
137 | CF_PAGE_EXEC)
138 #define __S110 __pgprot(CF_PAGE_VALID \
139 | CF_PAGE_ACCESSED \
140 | CF_PAGE_SHARED \
141 | CF_PAGE_EXEC)
142 #define __S111 __pgprot(CF_PAGE_VALID \
143 | CF_PAGE_ACCESSED \
144 | CF_PAGE_SHARED \
145 | CF_PAGE_READABLE \
146 | CF_PAGE_EXEC)
147
148 #define PTE_MASK PAGE_MASK
149 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
150
151 #ifndef __ASSEMBLY__
152
153 /*
154 * Conversion functions: convert a page and protection to a page entry,
155 * and a page entry and page directory to the page they refer to.
156 */
157 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
158
pte_modify(pte_t pte,pgprot_t newprot)159 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
160 {
161 pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
162 return pte;
163 }
164
165 #define pmd_set(pmdp, ptep) do {} while (0)
166
pgd_set(pgd_t * pgdp,pmd_t * pmdp)167 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
168 {
169 pgd_val(*pgdp) = virt_to_phys(pmdp);
170 }
171
172 #define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK))
173 #define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd)))
174
pte_none(pte_t pte)175 static inline int pte_none(pte_t pte)
176 {
177 return !pte_val(pte);
178 }
179
pte_present(pte_t pte)180 static inline int pte_present(pte_t pte)
181 {
182 return pte_val(pte) & CF_PAGE_VALID;
183 }
184
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)185 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
186 pte_t *ptep)
187 {
188 pte_val(*ptep) = 0;
189 }
190
191 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
192 #define pte_page(pte) virt_to_page(__pte_page(pte))
193
pmd_none2(pmd_t * pmd)194 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
195 #define pmd_none(pmd) pmd_none2(&(pmd))
pmd_bad2(pmd_t * pmd)196 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
197 #define pmd_bad(pmd) pmd_bad2(&(pmd))
198 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
pmd_clear(pmd_t * pmdp)199 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
200
pgd_none(pgd_t pgd)201 static inline int pgd_none(pgd_t pgd) { return 0; }
pgd_bad(pgd_t pgd)202 static inline int pgd_bad(pgd_t pgd) { return 0; }
pgd_present(pgd_t pgd)203 static inline int pgd_present(pgd_t pgd) { return 1; }
pgd_clear(pgd_t * pgdp)204 static inline void pgd_clear(pgd_t *pgdp) {}
205
206 #define pte_ERROR(e) \
207 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
208 __FILE__, __LINE__, pte_val(e))
209 #define pmd_ERROR(e) \
210 printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
211 __FILE__, __LINE__, pmd_val(e))
212 #define pgd_ERROR(e) \
213 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
214 __FILE__, __LINE__, pgd_val(e))
215
216 /*
217 * The following only work if pte_present() is true.
218 * Undefined behaviour if not...
219 * [we have the full set here even if they don't change from m68k]
220 */
pte_read(pte_t pte)221 static inline int pte_read(pte_t pte)
222 {
223 return pte_val(pte) & CF_PAGE_READABLE;
224 }
225
pte_write(pte_t pte)226 static inline int pte_write(pte_t pte)
227 {
228 return pte_val(pte) & CF_PAGE_WRITABLE;
229 }
230
pte_exec(pte_t pte)231 static inline int pte_exec(pte_t pte)
232 {
233 return pte_val(pte) & CF_PAGE_EXEC;
234 }
235
pte_dirty(pte_t pte)236 static inline int pte_dirty(pte_t pte)
237 {
238 return pte_val(pte) & CF_PAGE_DIRTY;
239 }
240
pte_young(pte_t pte)241 static inline int pte_young(pte_t pte)
242 {
243 return pte_val(pte) & CF_PAGE_ACCESSED;
244 }
245
pte_special(pte_t pte)246 static inline int pte_special(pte_t pte)
247 {
248 return 0;
249 }
250
pte_wrprotect(pte_t pte)251 static inline pte_t pte_wrprotect(pte_t pte)
252 {
253 pte_val(pte) &= ~CF_PAGE_WRITABLE;
254 return pte;
255 }
256
pte_rdprotect(pte_t pte)257 static inline pte_t pte_rdprotect(pte_t pte)
258 {
259 pte_val(pte) &= ~CF_PAGE_READABLE;
260 return pte;
261 }
262
pte_exprotect(pte_t pte)263 static inline pte_t pte_exprotect(pte_t pte)
264 {
265 pte_val(pte) &= ~CF_PAGE_EXEC;
266 return pte;
267 }
268
pte_mkclean(pte_t pte)269 static inline pte_t pte_mkclean(pte_t pte)
270 {
271 pte_val(pte) &= ~CF_PAGE_DIRTY;
272 return pte;
273 }
274
pte_mkold(pte_t pte)275 static inline pte_t pte_mkold(pte_t pte)
276 {
277 pte_val(pte) &= ~CF_PAGE_ACCESSED;
278 return pte;
279 }
280
pte_mkwrite(pte_t pte)281 static inline pte_t pte_mkwrite(pte_t pte)
282 {
283 pte_val(pte) |= CF_PAGE_WRITABLE;
284 return pte;
285 }
286
pte_mkread(pte_t pte)287 static inline pte_t pte_mkread(pte_t pte)
288 {
289 pte_val(pte) |= CF_PAGE_READABLE;
290 return pte;
291 }
292
pte_mkexec(pte_t pte)293 static inline pte_t pte_mkexec(pte_t pte)
294 {
295 pte_val(pte) |= CF_PAGE_EXEC;
296 return pte;
297 }
298
pte_mkdirty(pte_t pte)299 static inline pte_t pte_mkdirty(pte_t pte)
300 {
301 pte_val(pte) |= CF_PAGE_DIRTY;
302 return pte;
303 }
304
pte_mkyoung(pte_t pte)305 static inline pte_t pte_mkyoung(pte_t pte)
306 {
307 pte_val(pte) |= CF_PAGE_ACCESSED;
308 return pte;
309 }
310
pte_mknocache(pte_t pte)311 static inline pte_t pte_mknocache(pte_t pte)
312 {
313 pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
314 return pte;
315 }
316
pte_mkcache(pte_t pte)317 static inline pte_t pte_mkcache(pte_t pte)
318 {
319 pte_val(pte) &= ~CF_PAGE_NOCACHE;
320 return pte;
321 }
322
pte_mkspecial(pte_t pte)323 static inline pte_t pte_mkspecial(pte_t pte)
324 {
325 return pte;
326 }
327
328 #define swapper_pg_dir kernel_pg_dir
329 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
330
331 /*
332 * Find an entry in a pagetable directory.
333 */
334 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
335 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
336
337 /*
338 * Find an entry in a kernel pagetable directory.
339 */
340 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
341
342 /*
343 * Find an entry in the second-level pagetable.
344 */
pmd_offset(pgd_t * pgd,unsigned long address)345 static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
346 {
347 return (pmd_t *) pgd;
348 }
349
350 /*
351 * Find an entry in the third-level pagetable.
352 */
353 #define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
354 #define pte_offset_kernel(dir, address) \
355 ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
356
357 /*
358 * Disable caching for page at given kernel virtual address.
359 */
nocache_page(void * vaddr)360 static inline void nocache_page(void *vaddr)
361 {
362 pgd_t *dir;
363 pmd_t *pmdp;
364 pte_t *ptep;
365 unsigned long addr = (unsigned long) vaddr;
366
367 dir = pgd_offset_k(addr);
368 pmdp = pmd_offset(dir, addr);
369 ptep = pte_offset_kernel(pmdp, addr);
370 *ptep = pte_mknocache(*ptep);
371 }
372
373 /*
374 * Enable caching for page at given kernel virtual address.
375 */
cache_page(void * vaddr)376 static inline void cache_page(void *vaddr)
377 {
378 pgd_t *dir;
379 pmd_t *pmdp;
380 pte_t *ptep;
381 unsigned long addr = (unsigned long) vaddr;
382
383 dir = pgd_offset_k(addr);
384 pmdp = pmd_offset(dir, addr);
385 ptep = pte_offset_kernel(pmdp, addr);
386 *ptep = pte_mkcache(*ptep);
387 }
388
389 /*
390 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
391 */
392 #define __swp_type(x) ((x).val & 0xFF)
393 #define __swp_offset(x) ((x).val >> 11)
394 #define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \
395 (off << 11) })
396 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
397 #define __swp_entry_to_pte(x) (__pte((x).val))
398
399 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
400
401 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
402 __pte_offset(addr))
403 #define pte_unmap(pte) ((void) 0)
404 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
405 #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
406
407 #endif /* !__ASSEMBLY__ */
408 #endif /* _MCF_PGTABLE_H */
409
