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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/* 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
99static 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
107static 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
115static inline int pte_none(pte_t pte)
116{
117 return !pte_val(pte);
118}
119
120static inline int pte_present(pte_t pte)
121{
122 return pte_val(pte) & CF_PAGE_VALID;
123}
124
125static 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
133static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
134#define pmd_none(pmd) pmd_none2(&(pmd))
135static 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)))
138static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
139
140#define pte_ERROR(e) \
141 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
142 __FILE__, __LINE__, pte_val(e))
143#define pgd_ERROR(e) \
144 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
145 __FILE__, __LINE__, pgd_val(e))
146
147/*
148 * The following only work if pte_present() is true.
149 * Undefined behaviour if not...
150 * [we have the full set here even if they don't change from m68k]
151 */
152static inline int pte_read(pte_t pte)
153{
154 return pte_val(pte) & CF_PAGE_READABLE;
155}
156
157static inline int pte_write(pte_t pte)
158{
159 return pte_val(pte) & CF_PAGE_WRITABLE;
160}
161
162static inline int pte_exec(pte_t pte)
163{
164 return pte_val(pte) & CF_PAGE_EXEC;
165}
166
167static inline int pte_dirty(pte_t pte)
168{
169 return pte_val(pte) & CF_PAGE_DIRTY;
170}
171
172static inline int pte_young(pte_t pte)
173{
174 return pte_val(pte) & CF_PAGE_ACCESSED;
175}
176
177static inline pte_t pte_wrprotect(pte_t pte)
178{
179 pte_val(pte) &= ~CF_PAGE_WRITABLE;
180 return pte;
181}
182
183static inline pte_t pte_rdprotect(pte_t pte)
184{
185 pte_val(pte) &= ~CF_PAGE_READABLE;
186 return pte;
187}
188
189static inline pte_t pte_exprotect(pte_t pte)
190{
191 pte_val(pte) &= ~CF_PAGE_EXEC;
192 return pte;
193}
194
195static inline pte_t pte_mkclean(pte_t pte)
196{
197 pte_val(pte) &= ~CF_PAGE_DIRTY;
198 return pte;
199}
200
201static inline pte_t pte_mkold(pte_t pte)
202{
203 pte_val(pte) &= ~CF_PAGE_ACCESSED;
204 return pte;
205}
206
207static inline pte_t pte_mkwrite_novma(pte_t pte)
208{
209 pte_val(pte) |= CF_PAGE_WRITABLE;
210 return pte;
211}
212
213static inline pte_t pte_mkread(pte_t pte)
214{
215 pte_val(pte) |= CF_PAGE_READABLE;
216 return pte;
217}
218
219static inline pte_t pte_mkexec(pte_t pte)
220{
221 pte_val(pte) |= CF_PAGE_EXEC;
222 return pte;
223}
224
225static inline pte_t pte_mkdirty(pte_t pte)
226{
227 pte_val(pte) |= CF_PAGE_DIRTY;
228 return pte;
229}
230
231static inline pte_t pte_mkyoung(pte_t pte)
232{
233 pte_val(pte) |= CF_PAGE_ACCESSED;
234 return pte;
235}
236
237static inline pte_t pte_mknocache(pte_t pte)
238{
239 pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
240 return pte;
241}
242
243static inline pte_t pte_mkcache(pte_t pte)
244{
245 pte_val(pte) &= ~CF_PAGE_NOCACHE;
246 return pte;
247}
248
249#define swapper_pg_dir kernel_pg_dir
250extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
251
252/*
253 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
254 * are !pte_none() && !pte_present().
255 *
256 * Format of swap PTEs:
257 *
258 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
259 * 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
260 * <------------------ offset -------------> 0 0 0 E <-- type --->
261 *
262 * E is the exclusive marker that is not stored in swap entries.
263 */
264#define __swp_type(x) ((x).val & 0x7f)
265#define __swp_offset(x) ((x).val >> 11)
266#define __swp_entry(typ, off) ((swp_entry_t) { ((typ) & 0x7f) | \
267 (off << 11) })
268#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
269#define __swp_entry_to_pte(x) (__pte((x).val))
270
271static inline bool pte_swp_exclusive(pte_t pte)
272{
273 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
274}
275
276static inline pte_t pte_swp_mkexclusive(pte_t pte)
277{
278 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
279 return pte;
280}
281
282static inline pte_t pte_swp_clear_exclusive(pte_t pte)
283{
284 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
285 return pte;
286}
287
288#define PFN_PTE_SHIFT PAGE_SHIFT
289#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
290#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
291
292#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
293#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
294
295#endif /* !__ASSEMBLER__ */
296#endif /* _MCF_PGTABLE_H */
297

Warning: This file is not a C or C++ file. It does not have highlighting.

source code of linux/arch/m68k/include/asm/mcf_pgtable.h