xref: /linux/arch/m68k/include/asm/mcf_pgtable.h (revision c970236c300f9c2a32832cfd685f0f4f20a4a683) 
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 /* We borrow bit 7 to store the exclusive marker in swap PTEs. */
50 #define _PAGE_SWP_EXCLUSIVE	CF_PAGE_NOCACHE
51 
52 /*
53  * Externally used page protection values.
54  */
55 #define _PAGE_PRESENT	(CF_PAGE_VALID)
56 #define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
57 #define _PAGE_DIRTY	(CF_PAGE_DIRTY)
58 #define _PAGE_READWRITE (CF_PAGE_READABLE \
59 				| CF_PAGE_WRITABLE \
60 				| CF_PAGE_SYSTEM \
61 				| CF_PAGE_SHARED)
62 
63 /*
64  * Compound page protection values.
65  */
66 #define PAGE_NONE	__pgprot(CF_PAGE_VALID \
67 				 | CF_PAGE_ACCESSED)
68 
69 #define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
70 				 | CF_PAGE_ACCESSED \
71 				 | CF_PAGE_SHARED)
72 
73 #define PAGE_INIT	__pgprot(CF_PAGE_VALID \
74 				 | CF_PAGE_READABLE \
75 				 | CF_PAGE_WRITABLE \
76 				 | CF_PAGE_EXEC \
77 				 | CF_PAGE_SYSTEM)
78 
79 #define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
80 				 | CF_PAGE_ACCESSED \
81 				 | CF_PAGE_READABLE \
82 				 | CF_PAGE_WRITABLE \
83 				 | CF_PAGE_EXEC \
84 				 | CF_PAGE_SYSTEM \
85 				 | CF_PAGE_SHARED)
86 
87 #define PAGE_COPY	__pgprot(CF_PAGE_VALID \
88 				 | CF_PAGE_ACCESSED \
89 				 | CF_PAGE_READABLE \
90 				 | CF_PAGE_DIRTY)
91 
92 #define PTE_MASK	PAGE_MASK
93 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
94 
95 #ifndef __ASSEMBLER__
96 
97 #define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
98 
99 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
100 {
101 	pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
102 	return pte;
103 }
104 
105 #define pmd_set(pmdp, ptep) do {} while (0)
106 
107 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
108 {
109 	pgd_val(*pgdp) = virt_to_phys(pmdp);
110 }
111 
112 #define __pte_page(pte)	((void *) (pte_val(pte) & PAGE_MASK))
113 #define pmd_page_vaddr(pmd)	((unsigned long) (pmd_val(pmd)))
114 
115 static inline int pte_none(pte_t pte)
116 {
117 	return !pte_val(pte);
118 }
119 
120 static inline int pte_present(pte_t pte)
121 {
122 	return pte_val(pte) & CF_PAGE_VALID;
123 }
124 
125 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
126 	pte_t *ptep)
127 {
128 	pte_val(*ptep) = 0;
129 }
130 
131 #define pte_page(pte)	virt_to_page(__pte_page(pte))
132 
133 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
134 #define pmd_none(pmd) pmd_none2(&(pmd))
135 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
136 #define pmd_bad(pmd) pmd_bad2(&(pmd))
137 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
138 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
139 
140 
141 /*
142  * The following only work if pte_present() is true.
143  * Undefined behaviour if not...
144  * [we have the full set here even if they don't change from m68k]
145  */
146 static inline int pte_read(pte_t pte)
147 {
148 	return pte_val(pte) & CF_PAGE_READABLE;
149 }
150 
151 static inline int pte_write(pte_t pte)
152 {
153 	return pte_val(pte) & CF_PAGE_WRITABLE;
154 }
155 
156 static inline int pte_exec(pte_t pte)
157 {
158 	return pte_val(pte) & CF_PAGE_EXEC;
159 }
160 
161 static inline int pte_dirty(pte_t pte)
162 {
163 	return pte_val(pte) & CF_PAGE_DIRTY;
164 }
165 
166 static inline int pte_young(pte_t pte)
167 {
168 	return pte_val(pte) & CF_PAGE_ACCESSED;
169 }
170 
171 static inline pte_t pte_wrprotect(pte_t pte)
172 {
173 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
174 	return pte;
175 }
176 
177 static inline pte_t pte_rdprotect(pte_t pte)
178 {
179 	pte_val(pte) &= ~CF_PAGE_READABLE;
180 	return pte;
181 }
182 
183 static inline pte_t pte_exprotect(pte_t pte)
184 {
185 	pte_val(pte) &= ~CF_PAGE_EXEC;
186 	return pte;
187 }
188 
189 static inline pte_t pte_mkclean(pte_t pte)
190 {
191 	pte_val(pte) &= ~CF_PAGE_DIRTY;
192 	return pte;
193 }
194 
195 static inline pte_t pte_mkold(pte_t pte)
196 {
197 	pte_val(pte) &= ~CF_PAGE_ACCESSED;
198 	return pte;
199 }
200 
201 static inline pte_t pte_mkwrite_novma(pte_t pte)
202 {
203 	pte_val(pte) |= CF_PAGE_WRITABLE;
204 	return pte;
205 }
206 
207 static inline pte_t pte_mkread(pte_t pte)
208 {
209 	pte_val(pte) |= CF_PAGE_READABLE;
210 	return pte;
211 }
212 
213 static inline pte_t pte_mkexec(pte_t pte)
214 {
215 	pte_val(pte) |= CF_PAGE_EXEC;
216 	return pte;
217 }
218 
219 static inline pte_t pte_mkdirty(pte_t pte)
220 {
221 	pte_val(pte) |= CF_PAGE_DIRTY;
222 	return pte;
223 }
224 
225 static inline pte_t pte_mkyoung(pte_t pte)
226 {
227 	pte_val(pte) |= CF_PAGE_ACCESSED;
228 	return pte;
229 }
230 
231 static inline pte_t pte_mknocache(pte_t pte)
232 {
233 	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
234 	return pte;
235 }
236 
237 static inline pte_t pte_mkcache(pte_t pte)
238 {
239 	pte_val(pte) &= ~CF_PAGE_NOCACHE;
240 	return pte;
241 }
242 
243 #define swapper_pg_dir kernel_pg_dir
244 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
245 
246 /*
247  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
248  * are !pte_none() && !pte_present().
249  *
250  * Format of swap PTEs:
251  *
252  *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
253  *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
254  *   <------------------ offset -------------> 0 0 0 E <-- type --->
255  *
256  *   E is the exclusive marker that is not stored in swap entries.
257  */
258 #define __swp_type(x)		((x).val & 0x7f)
259 #define __swp_offset(x)		((x).val >> 11)
260 #define __swp_entry(typ, off)	((swp_entry_t) { ((typ) & 0x7f) | \
261 					(off << 11) })
262 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
263 #define __swp_entry_to_pte(x)	(__pte((x).val))
264 
265 static inline bool pte_swp_exclusive(pte_t pte)
266 {
267 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
268 }
269 
270 static inline pte_t pte_swp_mkexclusive(pte_t pte)
271 {
272 	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
273 	return pte;
274 }
275 
276 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
277 {
278 	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
279 	return pte;
280 }
281 
282 #define PFN_PTE_SHIFT		PAGE_SHIFT
283 #define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
284 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
285 
286 #define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
287 #define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
288 
289 #endif	/* !__ASSEMBLER__ */
290 #endif	/* _MCF_PGTABLE_H */
291