1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MCF_PGTABLE_H
#define _MCF_PGTABLE_H
#include <asm/mcfmmu.h>
#include <asm/page.h>
/*
* MMUDR bits, in proper place. We write these directly into the MMUDR
* after masking from the pte.
*/
#define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */
#define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */
#define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */
#define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */
#define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */
#define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */
#define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */
#define CF_CACHEMASK (~MMUDR_CM_CCB)
#define CF_PAGE_MMUDR_MASK 0x000000fe
#define _PAGE_NOCACHE030 CF_PAGE_NOCACHE
/*
* MMUTR bits, need shifting down.
*/
#define CF_PAGE_MMUTR_MASK 0x00000c00
#define CF_PAGE_MMUTR_SHIFT 10
#define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
#define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
/*
* Fake bits, not implemented in CF, will get masked out before
* hitting hardware.
*/
#define CF_PAGE_DIRTY 0x00000001
#define CF_PAGE_ACCESSED 0x00001000
#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
#define _DESCTYPE_MASK 0x003
#define _CACHEMASK040 (~0x060)
#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
#define _PAGE_SWP_EXCLUSIVE CF_PAGE_NOCACHE
/*
* Externally used page protection values.
*/
#define _PAGE_PRESENT (CF_PAGE_VALID)
#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
#define _PAGE_DIRTY (CF_PAGE_DIRTY)
#define _PAGE_READWRITE (CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED)
/*
* Compound page protection values.
*/
#define PAGE_NONE __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED)
#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED)
#define PAGE_INIT __pgprot(CF_PAGE_VALID \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM)
#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED)
#define PAGE_COPY __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_DIRTY)
#define PTE_MASK PAGE_MASK
#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
#ifndef __ASSEMBLY__
#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
#define pmd_set(pmdp, ptep) do {} while (0)
static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
{
pgd_val(*pgdp) = virt_to_phys(pmdp);
}
#define __pte_page(pte) ((void *) (pte_val(pte) & PAGE_MASK))
#define pmd_page_vaddr(pmd) ((unsigned long) (pmd_val(pmd)))
static inline int pte_none(pte_t pte)
{
return !pte_val(pte);
}
static inline int pte_present(pte_t pte)
{
return pte_val(pte) & CF_PAGE_VALID;
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_val(*ptep) = 0;
}
#define pte_page(pte) virt_to_page(__pte_page(pte))
static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
#define pmd_none(pmd) pmd_none2(&(pmd))
static inline int pmd_bad2(pmd_t *pmd) { return 0; }
#define pmd_bad(pmd) pmd_bad2(&(pmd))
#define pmd_present(pmd) (!pmd_none2(&(pmd)))
static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
__FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not...
* [we have the full set here even if they don't change from m68k]
*/
static inline int pte_read(pte_t pte)
{
return pte_val(pte) & CF_PAGE_READABLE;
}
static inline int pte_write(pte_t pte)
{
return pte_val(pte) & CF_PAGE_WRITABLE;
}
static inline int pte_exec(pte_t pte)
{
return pte_val(pte) & CF_PAGE_EXEC;
}
static inline int pte_dirty(pte_t pte)
{
return pte_val(pte) & CF_PAGE_DIRTY;
}
static inline int pte_young(pte_t pte)
{
return pte_val(pte) & CF_PAGE_ACCESSED;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_WRITABLE;
return pte;
}
static inline pte_t pte_rdprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_READABLE;
return pte;
}
static inline pte_t pte_exprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_EXEC;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= CF_PAGE_WRITABLE;
return pte;
}
static inline pte_t pte_mkread(pte_t pte)
{
pte_val(pte) |= CF_PAGE_READABLE;
return pte;
}
static inline pte_t pte_mkexec(pte_t pte)
{
pte_val(pte) |= CF_PAGE_EXEC;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= CF_PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= CF_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mknocache(pte_t pte)
{
pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
return pte;
}
static inline pte_t pte_mkcache(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_NOCACHE;
return pte;
}
#define swapper_pg_dir kernel_pg_dir
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
/*
* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
* are !pte_none() && !pte_present().
*
* Format of swap PTEs:
*
* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
* 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
* <------------------ offset -------------> 0 0 0 E <-- type --->
*
* E is the exclusive marker that is not stored in swap entries.
*/
#define __swp_type(x) ((x).val & 0x7f)
#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(typ, off) ((swp_entry_t) { ((typ) & 0x7f) | \
(off << 11) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) (__pte((x).val))
static inline int pte_swp_exclusive(pte_t pte)
{
return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
}
static inline pte_t pte_swp_mkexclusive(pte_t pte)
{
pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
return pte;
}
static inline pte_t pte_swp_clear_exclusive(pte_t pte)
{
pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
return pte;
}
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
#endif /* !__ASSEMBLY__ */
#endif /* _MCF_PGTABLE_H */
|
