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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2002 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 * Copyright (C) 2002 Maciej W. Rozycki
9 */
10#ifndef _ASM_PGTABLE_BITS_H
11#define _ASM_PGTABLE_BITS_H
12
13
14/*
15 * Note that we shift the lower 32bits of each EntryLo[01] entry
16 * 6 bits to the left. That way we can convert the PFN into the
17 * physical address by a single 'and' operation and gain 6 additional
18 * bits for storing information which isn't present in a normal
19 * MIPS page table.
20 *
21 * Similar to the Alpha port, we need to keep track of the ref
22 * and mod bits in software. We have a software "yeah you can read
23 * from this page" bit, and a hardware one which actually lets the
24 * process read from the page. On the same token we have a software
25 * writable bit and the real hardware one which actually lets the
26 * process write to the page, this keeps a mod bit via the hardware
27 * dirty bit.
28 *
29 * Certain revisions of the R4000 and R5000 have a bug where if a
30 * certain sequence occurs in the last 3 instructions of an executable
31 * page, and the following page is not mapped, the cpu can do
32 * unpredictable things. The code (when it is written) to deal with
33 * this problem will be in the update_mmu_cache() code for the r4k.
34 */
35#if defined(CONFIG_XPA)
36
37/*
38 * Page table bit offsets used for 64 bit physical addressing on
39 * MIPS32r5 with XPA.
40 */
41enum pgtable_bits {
42 /* Used by TLB hardware (placed in EntryLo*) */
43 _PAGE_NO_EXEC_SHIFT,
44 _PAGE_NO_READ_SHIFT,
45 _PAGE_GLOBAL_SHIFT,
46 _PAGE_VALID_SHIFT,
47 _PAGE_DIRTY_SHIFT,
48 _CACHE_SHIFT,
49
50 /* Used only by software (masked out before writing EntryLo*) */
51 _PAGE_PRESENT_SHIFT = 24,
52 _PAGE_WRITE_SHIFT,
53 _PAGE_ACCESSED_SHIFT,
54 _PAGE_MODIFIED_SHIFT,
55#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
56 _PAGE_SPECIAL_SHIFT,
57#endif
58#if defined(CONFIG_HAVE_ARCH_SOFT_DIRTY)
59 _PAGE_SOFT_DIRTY_SHIFT,
60#endif
61};
62
63/*
64 * Bits for extended EntryLo0/EntryLo1 registers
65 */
66#define _PFNX_MASK 0xffffff
67
68#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
69
70/*
71 * Page table bit offsets used for 36 bit physical addressing on MIPS32,
72 * for example with Alchemy or Netlogic XLP/XLR.
73 */
74enum pgtable_bits {
75 /* Used by TLB hardware (placed in EntryLo*) */
76 _PAGE_GLOBAL_SHIFT,
77 _PAGE_VALID_SHIFT,
78 _PAGE_DIRTY_SHIFT,
79 _CACHE_SHIFT,
80
81 /* Used only by software (masked out before writing EntryLo*) */
82 _PAGE_PRESENT_SHIFT = _CACHE_SHIFT + 3,
83 _PAGE_NO_READ_SHIFT,
84 _PAGE_WRITE_SHIFT,
85 _PAGE_ACCESSED_SHIFT,
86 _PAGE_MODIFIED_SHIFT,
87#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
88 _PAGE_SPECIAL_SHIFT,
89#endif
90#if defined(CONFIG_HAVE_ARCH_SOFT_DIRTY)
91 _PAGE_SOFT_DIRTY_SHIFT,
92#endif
93};
94
95#elif defined(CONFIG_CPU_R3K_TLB)
96
97/* Page table bits used for r3k systems */
98enum pgtable_bits {
99 /* Used only by software (writes to EntryLo ignored) */
100 _PAGE_PRESENT_SHIFT,
101 _PAGE_NO_READ_SHIFT,
102 _PAGE_WRITE_SHIFT,
103 _PAGE_ACCESSED_SHIFT,
104 _PAGE_MODIFIED_SHIFT,
105#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
106 _PAGE_SPECIAL_SHIFT,
107#endif
108#if defined(CONFIG_HAVE_ARCH_SOFT_DIRTY)
109 _PAGE_SOFT_DIRTY_SHIFT,
110#endif
111
112 /* Used by TLB hardware (placed in EntryLo) */
113 _PAGE_GLOBAL_SHIFT = 8,
114 _PAGE_VALID_SHIFT,
115 _PAGE_DIRTY_SHIFT,
116 _CACHE_UNCACHED_SHIFT,
117};
118
119#else
120
121/* Page table bits used for r4k systems */
122enum pgtable_bits {
123 /* Used only by software (masked out before writing EntryLo*) */
124 _PAGE_PRESENT_SHIFT,
125#if !defined(CONFIG_CPU_HAS_RIXI)
126 _PAGE_NO_READ_SHIFT,
127#endif
128 _PAGE_WRITE_SHIFT,
129 _PAGE_ACCESSED_SHIFT,
130 _PAGE_MODIFIED_SHIFT,
131#if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
132 _PAGE_HUGE_SHIFT,
133#endif
134#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
135 _PAGE_SPECIAL_SHIFT,
136#endif
137#if defined(CONFIG_HAVE_ARCH_SOFT_DIRTY)
138 _PAGE_SOFT_DIRTY_SHIFT,
139#endif
140 /* Used by TLB hardware (placed in EntryLo*) */
141#if defined(CONFIG_CPU_HAS_RIXI)
142 _PAGE_NO_EXEC_SHIFT,
143 _PAGE_NO_READ_SHIFT,
144#endif
145 _PAGE_GLOBAL_SHIFT,
146 _PAGE_VALID_SHIFT,
147 _PAGE_DIRTY_SHIFT,
148 _CACHE_SHIFT,
149};
150
151#endif /* defined(CONFIG_PHYS_ADDR_T_64BIT && defined(CONFIG_CPU_MIPS32) */
152
153/* Used only by software */
154#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
155#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
156#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
157#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)
158#if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
159# define _PAGE_HUGE (1 << _PAGE_HUGE_SHIFT)
160#endif
161#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
162# define _PAGE_SPECIAL (1 << _PAGE_SPECIAL_SHIFT)
163#else
164# define _PAGE_SPECIAL 0
165#endif
166#if defined(CONFIG_HAVE_ARCH_SOFT_DIRTY)
167# define _PAGE_SOFT_DIRTY (1 << _PAGE_SOFT_DIRTY_SHIFT)
168#else
169# define _PAGE_SOFT_DIRTY 0
170#endif
171
172/* Used by TLB hardware (placed in EntryLo*) */
173#if defined(CONFIG_XPA)
174# define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
175#elif defined(CONFIG_CPU_HAS_RIXI)
176# define _PAGE_NO_EXEC (cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0)
177#endif
178#define _PAGE_NO_READ (1 << _PAGE_NO_READ_SHIFT)
179#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
180#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
181#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
182#if defined(CONFIG_CPU_R3K_TLB)
183# define _CACHE_UNCACHED (1 << _CACHE_UNCACHED_SHIFT)
184# define _CACHE_MASK _CACHE_UNCACHED
185# define _PFN_SHIFT PAGE_SHIFT
186#else
187# define _CACHE_MASK (7 << _CACHE_SHIFT)
188# define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)
189#endif
190
191#ifndef _PAGE_NO_EXEC
192#define _PAGE_NO_EXEC 0
193#endif
194
195#define _PAGE_SILENT_READ _PAGE_VALID
196#define _PAGE_SILENT_WRITE _PAGE_DIRTY
197
198#define _PFN_MASK (~((1 << (_PFN_SHIFT)) - 1))
199
200/*
201 * The final layouts of the PTE bits are:
202 *
203 * 64-bit, R1 or earlier: CCC D V G [S H] M A W R P
204 * 32-bit, R1 or earler: CCC D V G M A W R P
205 * 64-bit, R2 or later: CCC D V G RI/R XI [S H] M A W P
206 * 32-bit, R2 or later: CCC D V G RI/R XI M A W P
207 */
208
209
210/*
211 * pte_to_entrylo converts a page table entry (PTE) into a Mips
212 * entrylo0/1 value.
213 */
214static inline uint64_t pte_to_entrylo(unsigned long pte_val)
215{
216#ifdef CONFIG_CPU_HAS_RIXI
217 if (cpu_has_rixi) {
218 int sa;
219#ifdef CONFIG_32BIT
220 sa = 31 - _PAGE_NO_READ_SHIFT;
221#else
222 sa = 63 - _PAGE_NO_READ_SHIFT;
223#endif
224 /*
225 * C has no way to express that this is a DSRL
226 * _PAGE_NO_EXEC_SHIFT followed by a ROTR 2. Luckily
227 * in the fast path this is done in assembly
228 */
229 return (pte_val >> _PAGE_GLOBAL_SHIFT) |
230 ((pte_val & (_PAGE_NO_EXEC | _PAGE_NO_READ)) << sa);
231 }
232#endif
233
234 return pte_val >> _PAGE_GLOBAL_SHIFT;
235}
236
237/*
238 * Cache attributes
239 */
240#if defined(CONFIG_CPU_R3K_TLB)
241
242#define _CACHE_CACHABLE_NONCOHERENT 0
243#define _CACHE_UNCACHED_ACCELERATED _CACHE_UNCACHED
244
245#elif defined(CONFIG_CPU_SB1)
246
247/* No penalty for being coherent on the SB1, so just
248 use it for "noncoherent" spaces, too. Shouldn't hurt. */
249
250#define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)
251
252#elif defined(CONFIG_MACH_INGENIC)
253
254/* Ingenic uses the WA bit to achieve write-combine memory writes */
255#define _CACHE_UNCACHED_ACCELERATED (1<<_CACHE_SHIFT)
256
257#endif
258
259#ifndef _CACHE_CACHABLE_NO_WA
260#define _CACHE_CACHABLE_NO_WA (0<<_CACHE_SHIFT)
261#endif
262#ifndef _CACHE_CACHABLE_WA
263#define _CACHE_CACHABLE_WA (1<<_CACHE_SHIFT)
264#endif
265#ifndef _CACHE_UNCACHED
266#define _CACHE_UNCACHED (2<<_CACHE_SHIFT)
267#endif
268#ifndef _CACHE_CACHABLE_NONCOHERENT
269#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)
270#endif
271#ifndef _CACHE_CACHABLE_CE
272#define _CACHE_CACHABLE_CE (4<<_CACHE_SHIFT)
273#endif
274#ifndef _CACHE_CACHABLE_COW
275#define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT)
276#endif
277#ifndef _CACHE_CACHABLE_CUW
278#define _CACHE_CACHABLE_CUW (6<<_CACHE_SHIFT)
279#endif
280#ifndef _CACHE_UNCACHED_ACCELERATED
281#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)
282#endif
283
284#define __READABLE (_PAGE_SILENT_READ | _PAGE_ACCESSED)
285#define __WRITEABLE (_PAGE_SILENT_WRITE | _PAGE_WRITE | _PAGE_MODIFIED)
286
287#define _PAGE_CHG_MASK (_PAGE_ACCESSED | _PAGE_MODIFIED | \
288 _PAGE_SOFT_DIRTY | _PFN_MASK | _CACHE_MASK)
289
290#endif /* _ASM_PGTABLE_BITS_H */
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2002 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 * Copyright (C) 2002 Maciej W. Rozycki
9 */
10#ifndef _ASM_PGTABLE_BITS_H
11#define _ASM_PGTABLE_BITS_H
12
13
14/*
15 * Note that we shift the lower 32bits of each EntryLo[01] entry
16 * 6 bits to the left. That way we can convert the PFN into the
17 * physical address by a single 'and' operation and gain 6 additional
18 * bits for storing information which isn't present in a normal
19 * MIPS page table.
20 *
21 * Similar to the Alpha port, we need to keep track of the ref
22 * and mod bits in software. We have a software "yeah you can read
23 * from this page" bit, and a hardware one which actually lets the
24 * process read from the page. On the same token we have a software
25 * writable bit and the real hardware one which actually lets the
26 * process write to the page, this keeps a mod bit via the hardware
27 * dirty bit.
28 *
29 * Certain revisions of the R4000 and R5000 have a bug where if a
30 * certain sequence occurs in the last 3 instructions of an executable
31 * page, and the following page is not mapped, the cpu can do
32 * unpredictable things. The code (when it is written) to deal with
33 * this problem will be in the update_mmu_cache() code for the r4k.
34 */
35#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
36
37/*
38 * The following bits are implemented by the TLB hardware
39 */
40#define _PAGE_NO_EXEC_SHIFT 0
41#define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
42#define _PAGE_NO_READ_SHIFT (_PAGE_NO_EXEC_SHIFT + 1)
43#define _PAGE_NO_READ (1 << _PAGE_NO_READ_SHIFT)
44#define _PAGE_GLOBAL_SHIFT (_PAGE_NO_READ_SHIFT + 1)
45#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
46#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
47#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
48#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
49#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
50#define _CACHE_SHIFT (_PAGE_DIRTY_SHIFT + 1)
51#define _CACHE_MASK (7 << _CACHE_SHIFT)
52
53/*
54 * The following bits are implemented in software
55 */
56#define _PAGE_PRESENT_SHIFT (24)
57#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
58#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
59#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
60#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
61#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
62#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
63#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
64#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
65#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)
66
67#define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)
68
69/*
70 * Bits for extended EntryLo0/EntryLo1 registers
71 */
72#define _PFNX_MASK 0xffffff
73
74#elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
75
76/*
77 * The following bits are implemented in software
78 */
79#define _PAGE_PRESENT_SHIFT (0)
80#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
81#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
82#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
83#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
84#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
85#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
86#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
87#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
88#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)
89
90/*
91 * The following bits are implemented by the TLB hardware
92 */
93#define _PAGE_GLOBAL_SHIFT (_PAGE_MODIFIED_SHIFT + 4)
94#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
95#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
96#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
97#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
98#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
99#define _CACHE_UNCACHED_SHIFT (_PAGE_DIRTY_SHIFT + 1)
100#define _CACHE_UNCACHED (1 << _CACHE_UNCACHED_SHIFT)
101#define _CACHE_MASK _CACHE_UNCACHED
102
103#define _PFN_SHIFT PAGE_SHIFT
104
105#else
106/*
107 * Below are the "Normal" R4K cases
108 */
109
110/*
111 * The following bits are implemented in software
112 */
113#define _PAGE_PRESENT_SHIFT 0
114#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
115/* R2 or later cores check for RI/XI support to determine _PAGE_READ */
116#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
117#define _PAGE_WRITE_SHIFT (_PAGE_PRESENT_SHIFT + 1)
118#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
119#else
120#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
121#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
122#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
123#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
124#endif
125#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
126#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
127#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
128#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)
129
130#if defined(CONFIG_64BIT) && defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
131/* Huge TLB page */
132#define _PAGE_HUGE_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
133#define _PAGE_HUGE (1 << _PAGE_HUGE_SHIFT)
134#endif /* CONFIG_64BIT && CONFIG_MIPS_HUGE_TLB_SUPPORT */
135
136#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
137/* XI - page cannot be executed */
138#ifdef _PAGE_HUGE_SHIFT
139#define _PAGE_NO_EXEC_SHIFT (_PAGE_HUGE_SHIFT + 1)
140#else
141#define _PAGE_NO_EXEC_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
142#endif
143#define _PAGE_NO_EXEC (cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0)
144
145/* RI - page cannot be read */
146#define _PAGE_READ_SHIFT (_PAGE_NO_EXEC_SHIFT + 1)
147#define _PAGE_READ (cpu_has_rixi ? 0 : (1 << _PAGE_READ_SHIFT))
148#define _PAGE_NO_READ_SHIFT _PAGE_READ_SHIFT
149#define _PAGE_NO_READ (cpu_has_rixi ? (1 << _PAGE_READ_SHIFT) : 0)
150#endif /* defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) */
151
152#if defined(_PAGE_NO_READ_SHIFT)
153#define _PAGE_GLOBAL_SHIFT (_PAGE_NO_READ_SHIFT + 1)
154#elif defined(_PAGE_HUGE_SHIFT)
155#define _PAGE_GLOBAL_SHIFT (_PAGE_HUGE_SHIFT + 1)
156#else
157#define _PAGE_GLOBAL_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
158#endif
159#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
160
161#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
162#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
163#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
164#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
165#define _CACHE_SHIFT (_PAGE_DIRTY_SHIFT + 1)
166#define _CACHE_MASK (7 << _CACHE_SHIFT)
167
168#define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)
169
170#endif /* defined(CONFIG_PHYS_ADDR_T_64BIT && defined(CONFIG_CPU_MIPS32) */
171
172#ifndef _PAGE_NO_EXEC
173#define _PAGE_NO_EXEC 0
174#endif
175#ifndef _PAGE_NO_READ
176#define _PAGE_NO_READ 0
177#endif
178
179#define _PAGE_SILENT_READ _PAGE_VALID
180#define _PAGE_SILENT_WRITE _PAGE_DIRTY
181
182#define _PFN_MASK (~((1 << (_PFN_SHIFT)) - 1))
183
184/*
185 * The final layouts of the PTE bits are:
186 *
187 * 64-bit, R1 or earlier: CCC D V G [S H] M A W R P
188 * 32-bit, R1 or earler: CCC D V G M A W R P
189 * 64-bit, R2 or later: CCC D V G RI/R XI [S H] M A W P
190 * 32-bit, R2 or later: CCC D V G RI/R XI M A W P
191 */
192
193
194#ifndef __ASSEMBLY__
195/*
196 * pte_to_entrylo converts a page table entry (PTE) into a Mips
197 * entrylo0/1 value.
198 */
199static inline uint64_t pte_to_entrylo(unsigned long pte_val)
200{
201#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
202 if (cpu_has_rixi) {
203 int sa;
204#ifdef CONFIG_32BIT
205 sa = 31 - _PAGE_NO_READ_SHIFT;
206#else
207 sa = 63 - _PAGE_NO_READ_SHIFT;
208#endif
209 /*
210 * C has no way to express that this is a DSRL
211 * _PAGE_NO_EXEC_SHIFT followed by a ROTR 2. Luckily
212 * in the fast path this is done in assembly
213 */
214 return (pte_val >> _PAGE_GLOBAL_SHIFT) |
215 ((pte_val & (_PAGE_NO_EXEC | _PAGE_NO_READ)) << sa);
216 }
217#endif
218
219 return pte_val >> _PAGE_GLOBAL_SHIFT;
220}
221#endif
222
223/*
224 * Cache attributes
225 */
226#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
227
228#define _CACHE_CACHABLE_NONCOHERENT 0
229#define _CACHE_UNCACHED_ACCELERATED _CACHE_UNCACHED
230
231#elif defined(CONFIG_CPU_SB1)
232
233/* No penalty for being coherent on the SB1, so just
234 use it for "noncoherent" spaces, too. Shouldn't hurt. */
235
236#define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)
237
238#elif defined(CONFIG_CPU_LOONGSON3)
239
240/* Using COHERENT flag for NONCOHERENT doesn't hurt. */
241
242#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT) /* LOONGSON */
243#define _CACHE_CACHABLE_COHERENT (3<<_CACHE_SHIFT) /* LOONGSON-3 */
244
245#elif defined(CONFIG_MACH_INGENIC)
246
247/* Ingenic uses the WA bit to achieve write-combine memory writes */
248#define _CACHE_UNCACHED_ACCELERATED (1<<_CACHE_SHIFT)
249
250#endif
251
252#ifndef _CACHE_CACHABLE_NO_WA
253#define _CACHE_CACHABLE_NO_WA (0<<_CACHE_SHIFT)
254#endif
255#ifndef _CACHE_CACHABLE_WA
256#define _CACHE_CACHABLE_WA (1<<_CACHE_SHIFT)
257#endif
258#ifndef _CACHE_UNCACHED
259#define _CACHE_UNCACHED (2<<_CACHE_SHIFT)
260#endif
261#ifndef _CACHE_CACHABLE_NONCOHERENT
262#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)
263#endif
264#ifndef _CACHE_CACHABLE_CE
265#define _CACHE_CACHABLE_CE (4<<_CACHE_SHIFT)
266#endif
267#ifndef _CACHE_CACHABLE_COW
268#define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT)
269#endif
270#ifndef _CACHE_CACHABLE_CUW
271#define _CACHE_CACHABLE_CUW (6<<_CACHE_SHIFT)
272#endif
273#ifndef _CACHE_UNCACHED_ACCELERATED
274#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)
275#endif
276
277#define __READABLE (_PAGE_SILENT_READ | _PAGE_READ | _PAGE_ACCESSED)
278#define __WRITEABLE (_PAGE_SILENT_WRITE | _PAGE_WRITE | _PAGE_MODIFIED)
279
280#define _PAGE_CHG_MASK (_PAGE_ACCESSED | _PAGE_MODIFIED | \
281 _PFN_MASK | _CACHE_MASK)
282
283#endif /* _ASM_PGTABLE_BITS_H */