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Linux/arch/m68k/include/asm/mcf_pgtable.h

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  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 
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 
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 
175 static inline int pte_none(pte_t pte)
176 {
177         return !pte_val(pte);
178 }
179 
180 static inline int pte_present(pte_t pte)
181 {
182         return pte_val(pte) & CF_PAGE_VALID;
183 }
184 
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 
194 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
195 #define pmd_none(pmd) pmd_none2(&(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)))
199 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
200 
201 static inline int pgd_none(pgd_t pgd) { return 0; }
202 static inline int pgd_bad(pgd_t pgd) { return 0; }
203 static inline int pgd_present(pgd_t pgd) { return 1; }
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  */
221 static inline int pte_read(pte_t pte)
222 {
223         return pte_val(pte) & CF_PAGE_READABLE;
224 }
225 
226 static inline int pte_write(pte_t pte)
227 {
228         return pte_val(pte) & CF_PAGE_WRITABLE;
229 }
230 
231 static inline int pte_exec(pte_t pte)
232 {
233         return pte_val(pte) & CF_PAGE_EXEC;
234 }
235 
236 static inline int pte_dirty(pte_t pte)
237 {
238         return pte_val(pte) & CF_PAGE_DIRTY;
239 }
240 
241 static inline int pte_young(pte_t pte)
242 {
243         return pte_val(pte) & CF_PAGE_ACCESSED;
244 }
245 
246 static inline int pte_special(pte_t pte)
247 {
248         return 0;
249 }
250 
251 static inline pte_t pte_wrprotect(pte_t pte)
252 {
253         pte_val(pte) &= ~CF_PAGE_WRITABLE;
254         return pte;
255 }
256 
257 static inline pte_t pte_rdprotect(pte_t pte)
258 {
259         pte_val(pte) &= ~CF_PAGE_READABLE;
260         return pte;
261 }
262 
263 static inline pte_t pte_exprotect(pte_t pte)
264 {
265         pte_val(pte) &= ~CF_PAGE_EXEC;
266         return pte;
267 }
268 
269 static inline pte_t pte_mkclean(pte_t pte)
270 {
271         pte_val(pte) &= ~CF_PAGE_DIRTY;
272         return pte;
273 }
274 
275 static inline pte_t pte_mkold(pte_t pte)
276 {
277         pte_val(pte) &= ~CF_PAGE_ACCESSED;
278         return pte;
279 }
280 
281 static inline pte_t pte_mkwrite(pte_t pte)
282 {
283         pte_val(pte) |= CF_PAGE_WRITABLE;
284         return pte;
285 }
286 
287 static inline pte_t pte_mkread(pte_t pte)
288 {
289         pte_val(pte) |= CF_PAGE_READABLE;
290         return pte;
291 }
292 
293 static inline pte_t pte_mkexec(pte_t pte)
294 {
295         pte_val(pte) |= CF_PAGE_EXEC;
296         return pte;
297 }
298 
299 static inline pte_t pte_mkdirty(pte_t pte)
300 {
301         pte_val(pte) |= CF_PAGE_DIRTY;
302         return pte;
303 }
304 
305 static inline pte_t pte_mkyoung(pte_t pte)
306 {
307         pte_val(pte) |= CF_PAGE_ACCESSED;
308         return pte;
309 }
310 
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 
317 static inline pte_t pte_mkcache(pte_t pte)
318 {
319         pte_val(pte) &= ~CF_PAGE_NOCACHE;
320         return pte;
321 }
322 
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  */
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  */
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  */
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 

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