Linux kernel mirror (for testing)
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linux
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
159static 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
167static 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
175static inline int pte_none(pte_t pte)
176{
177 return !pte_val(pte);
178}
179
180static inline int pte_present(pte_t pte)
181{
182 return pte_val(pte) & CF_PAGE_VALID;
183}
184
185static 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
194static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
195#define pmd_none(pmd) pmd_none2(&(pmd))
196static 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)))
199static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
200
201#define pte_ERROR(e) \
202 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
203 __FILE__, __LINE__, pte_val(e))
204#define pgd_ERROR(e) \
205 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
206 __FILE__, __LINE__, pgd_val(e))
207
208/*
209 * The following only work if pte_present() is true.
210 * Undefined behaviour if not...
211 * [we have the full set here even if they don't change from m68k]
212 */
213static inline int pte_read(pte_t pte)
214{
215 return pte_val(pte) & CF_PAGE_READABLE;
216}
217
218static inline int pte_write(pte_t pte)
219{
220 return pte_val(pte) & CF_PAGE_WRITABLE;
221}
222
223static inline int pte_exec(pte_t pte)
224{
225 return pte_val(pte) & CF_PAGE_EXEC;
226}
227
228static inline int pte_dirty(pte_t pte)
229{
230 return pte_val(pte) & CF_PAGE_DIRTY;
231}
232
233static inline int pte_young(pte_t pte)
234{
235 return pte_val(pte) & CF_PAGE_ACCESSED;
236}
237
238static inline pte_t pte_wrprotect(pte_t pte)
239{
240 pte_val(pte) &= ~CF_PAGE_WRITABLE;
241 return pte;
242}
243
244static inline pte_t pte_rdprotect(pte_t pte)
245{
246 pte_val(pte) &= ~CF_PAGE_READABLE;
247 return pte;
248}
249
250static inline pte_t pte_exprotect(pte_t pte)
251{
252 pte_val(pte) &= ~CF_PAGE_EXEC;
253 return pte;
254}
255
256static inline pte_t pte_mkclean(pte_t pte)
257{
258 pte_val(pte) &= ~CF_PAGE_DIRTY;
259 return pte;
260}
261
262static inline pte_t pte_mkold(pte_t pte)
263{
264 pte_val(pte) &= ~CF_PAGE_ACCESSED;
265 return pte;
266}
267
268static inline pte_t pte_mkwrite(pte_t pte)
269{
270 pte_val(pte) |= CF_PAGE_WRITABLE;
271 return pte;
272}
273
274static inline pte_t pte_mkread(pte_t pte)
275{
276 pte_val(pte) |= CF_PAGE_READABLE;
277 return pte;
278}
279
280static inline pte_t pte_mkexec(pte_t pte)
281{
282 pte_val(pte) |= CF_PAGE_EXEC;
283 return pte;
284}
285
286static inline pte_t pte_mkdirty(pte_t pte)
287{
288 pte_val(pte) |= CF_PAGE_DIRTY;
289 return pte;
290}
291
292static inline pte_t pte_mkyoung(pte_t pte)
293{
294 pte_val(pte) |= CF_PAGE_ACCESSED;
295 return pte;
296}
297
298static inline pte_t pte_mknocache(pte_t pte)
299{
300 pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
301 return pte;
302}
303
304static inline pte_t pte_mkcache(pte_t pte)
305{
306 pte_val(pte) &= ~CF_PAGE_NOCACHE;
307 return pte;
308}
309
310#define swapper_pg_dir kernel_pg_dir
311extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
312
313/*
314 * Find an entry in a pagetable directory.
315 */
316#define pgd_index(address) ((address) >> PGDIR_SHIFT)
317#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
318
319/*
320 * Find an entry in a kernel pagetable directory.
321 */
322#define pgd_offset_k(address) pgd_offset(&init_mm, address)
323
324/*
325 * Find an entry in the third-level pagetable.
326 */
327#define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
328#define pte_offset_kernel(dir, address) \
329 ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
330
331/*
332 * Disable caching for page at given kernel virtual address.
333 */
334static inline void nocache_page(void *vaddr)
335{
336 pgd_t *dir;
337 p4d_t *p4dp;
338 pud_t *pudp;
339 pmd_t *pmdp;
340 pte_t *ptep;
341 unsigned long addr = (unsigned long) vaddr;
342
343 dir = pgd_offset_k(addr);
344 p4dp = p4d_offset(dir, addr);
345 pudp = pud_offset(p4dp, addr);
346 pmdp = pmd_offset(pudp, addr);
347 ptep = pte_offset_kernel(pmdp, addr);
348 *ptep = pte_mknocache(*ptep);
349}
350
351/*
352 * Enable caching for page at given kernel virtual address.
353 */
354static inline void cache_page(void *vaddr)
355{
356 pgd_t *dir;
357 p4d_t *p4dp;
358 pud_t *pudp;
359 pmd_t *pmdp;
360 pte_t *ptep;
361 unsigned long addr = (unsigned long) vaddr;
362
363 dir = pgd_offset_k(addr);
364 p4dp = p4d_offset(dir, addr);
365 pudp = pud_offset(p4dp, addr);
366 pmdp = pmd_offset(pudp, addr);
367 ptep = pte_offset_kernel(pmdp, addr);
368 *ptep = pte_mkcache(*ptep);
369}
370
371/*
372 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
373 */
374#define __swp_type(x) ((x).val & 0xFF)
375#define __swp_offset(x) ((x).val >> 11)
376#define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \
377 (off << 11) })
378#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
379#define __swp_entry_to_pte(x) (__pte((x).val))
380
381#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
382
383#define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
384 __pte_offset(addr))
385#define pte_unmap(pte) ((void) 0)
386#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
387#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
388
389#endif /* !__ASSEMBLY__ */
390#endif /* _MCF_PGTABLE_H */