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 #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  */
213 static inline int pte_read(pte_t pte)
214 {
215 	return pte_val(pte) & CF_PAGE_READABLE;
216 }
217 
218 static inline int pte_write(pte_t pte)
219 {
220 	return pte_val(pte) & CF_PAGE_WRITABLE;
221 }
222 
223 static inline int pte_exec(pte_t pte)
224 {
225 	return pte_val(pte) & CF_PAGE_EXEC;
226 }
227 
228 static inline int pte_dirty(pte_t pte)
229 {
230 	return pte_val(pte) & CF_PAGE_DIRTY;
231 }
232 
233 static inline int pte_young(pte_t pte)
234 {
235 	return pte_val(pte) & CF_PAGE_ACCESSED;
236 }
237 
238 static inline pte_t pte_wrprotect(pte_t pte)
239 {
240 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
241 	return pte;
242 }
243 
244 static inline pte_t pte_rdprotect(pte_t pte)
245 {
246 	pte_val(pte) &= ~CF_PAGE_READABLE;
247 	return pte;
248 }
249 
250 static inline pte_t pte_exprotect(pte_t pte)
251 {
252 	pte_val(pte) &= ~CF_PAGE_EXEC;
253 	return pte;
254 }
255 
256 static inline pte_t pte_mkclean(pte_t pte)
257 {
258 	pte_val(pte) &= ~CF_PAGE_DIRTY;
259 	return pte;
260 }
261 
262 static inline pte_t pte_mkold(pte_t pte)
263 {
264 	pte_val(pte) &= ~CF_PAGE_ACCESSED;
265 	return pte;
266 }
267 
268 static inline pte_t pte_mkwrite(pte_t pte)
269 {
270 	pte_val(pte) |= CF_PAGE_WRITABLE;
271 	return pte;
272 }
273 
274 static inline pte_t pte_mkread(pte_t pte)
275 {
276 	pte_val(pte) |= CF_PAGE_READABLE;
277 	return pte;
278 }
279 
280 static inline pte_t pte_mkexec(pte_t pte)
281 {
282 	pte_val(pte) |= CF_PAGE_EXEC;
283 	return pte;
284 }
285 
286 static inline pte_t pte_mkdirty(pte_t pte)
287 {
288 	pte_val(pte) |= CF_PAGE_DIRTY;
289 	return pte;
290 }
291 
292 static inline pte_t pte_mkyoung(pte_t pte)
293 {
294 	pte_val(pte) |= CF_PAGE_ACCESSED;
295 	return pte;
296 }
297 
298 static inline pte_t pte_mknocache(pte_t pte)
299 {
300 	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
301 	return pte;
302 }
303 
304 static 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
311 extern 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  */
334 static 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  */
354 static 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 */
391