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 #define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
154 
155 /*
156  * Conversion functions: convert a page and protection to a page entry,
157  * and a page entry and page directory to the page they refer to.
158  */
159 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
160 
161 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
162 {
163 	pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
164 	return pte;
165 }
166 
167 #define pmd_set(pmdp, ptep) do {} while (0)
168 
169 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
170 {
171 	pgd_val(*pgdp) = virt_to_phys(pmdp);
172 }
173 
174 #define __pte_page(pte)	((unsigned long) (pte_val(pte) & PAGE_MASK))
175 #define pmd_page_vaddr(pmd)	((unsigned long) (pmd_val(pmd)))
176 
177 static inline int pte_none(pte_t pte)
178 {
179 	return !pte_val(pte);
180 }
181 
182 static inline int pte_present(pte_t pte)
183 {
184 	return pte_val(pte) & CF_PAGE_VALID;
185 }
186 
187 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
188 	pte_t *ptep)
189 {
190 	pte_val(*ptep) = 0;
191 }
192 
193 #define pte_pagenr(pte)	((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
194 #define pte_page(pte)	virt_to_page(__pte_page(pte))
195 
196 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
197 #define pmd_none(pmd) pmd_none2(&(pmd))
198 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
199 #define pmd_bad(pmd) pmd_bad2(&(pmd))
200 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
201 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
202 
203 #define pte_ERROR(e) \
204 	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
205 	__FILE__, __LINE__, pte_val(e))
206 #define pgd_ERROR(e) \
207 	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
208 	__FILE__, __LINE__, pgd_val(e))
209 
210 /*
211  * The following only work if pte_present() is true.
212  * Undefined behaviour if not...
213  * [we have the full set here even if they don't change from m68k]
214  */
215 static inline int pte_read(pte_t pte)
216 {
217 	return pte_val(pte) & CF_PAGE_READABLE;
218 }
219 
220 static inline int pte_write(pte_t pte)
221 {
222 	return pte_val(pte) & CF_PAGE_WRITABLE;
223 }
224 
225 static inline int pte_exec(pte_t pte)
226 {
227 	return pte_val(pte) & CF_PAGE_EXEC;
228 }
229 
230 static inline int pte_dirty(pte_t pte)
231 {
232 	return pte_val(pte) & CF_PAGE_DIRTY;
233 }
234 
235 static inline int pte_young(pte_t pte)
236 {
237 	return pte_val(pte) & CF_PAGE_ACCESSED;
238 }
239 
240 static inline pte_t pte_wrprotect(pte_t pte)
241 {
242 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
243 	return pte;
244 }
245 
246 static inline pte_t pte_rdprotect(pte_t pte)
247 {
248 	pte_val(pte) &= ~CF_PAGE_READABLE;
249 	return pte;
250 }
251 
252 static inline pte_t pte_exprotect(pte_t pte)
253 {
254 	pte_val(pte) &= ~CF_PAGE_EXEC;
255 	return pte;
256 }
257 
258 static inline pte_t pte_mkclean(pte_t pte)
259 {
260 	pte_val(pte) &= ~CF_PAGE_DIRTY;
261 	return pte;
262 }
263 
264 static inline pte_t pte_mkold(pte_t pte)
265 {
266 	pte_val(pte) &= ~CF_PAGE_ACCESSED;
267 	return pte;
268 }
269 
270 static inline pte_t pte_mkwrite(pte_t pte)
271 {
272 	pte_val(pte) |= CF_PAGE_WRITABLE;
273 	return pte;
274 }
275 
276 static inline pte_t pte_mkread(pte_t pte)
277 {
278 	pte_val(pte) |= CF_PAGE_READABLE;
279 	return pte;
280 }
281 
282 static inline pte_t pte_mkexec(pte_t pte)
283 {
284 	pte_val(pte) |= CF_PAGE_EXEC;
285 	return pte;
286 }
287 
288 static inline pte_t pte_mkdirty(pte_t pte)
289 {
290 	pte_val(pte) |= CF_PAGE_DIRTY;
291 	return pte;
292 }
293 
294 static inline pte_t pte_mkyoung(pte_t pte)
295 {
296 	pte_val(pte) |= CF_PAGE_ACCESSED;
297 	return pte;
298 }
299 
300 static inline pte_t pte_mknocache(pte_t pte)
301 {
302 	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
303 	return pte;
304 }
305 
306 static inline pte_t pte_mkcache(pte_t pte)
307 {
308 	pte_val(pte) &= ~CF_PAGE_NOCACHE;
309 	return pte;
310 }
311 
312 #define swapper_pg_dir kernel_pg_dir
313 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
314 
315 /*
316  * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
317  */
318 #define __swp_type(x)		((x).val & 0xFF)
319 #define __swp_offset(x)		((x).val >> 11)
320 #define __swp_entry(typ, off)	((swp_entry_t) { (typ) | \
321 					(off << 11) })
322 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
323 #define __swp_entry_to_pte(x)	(__pte((x).val))
324 
325 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
326 
327 #define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
328 #define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
329 
330 #endif	/* !__ASSEMBLY__ */
331 #endif	/* _MCF_PGTABLE_H */
332