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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 | ||
1da177e4 LT |
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 | */ | |
962f480e | 35 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
1da177e4 LT |
36 | |
37 | #define _PAGE_PRESENT (1<<6) /* implemented in software */ | |
38 | #define _PAGE_READ (1<<7) /* implemented in software */ | |
39 | #define _PAGE_WRITE (1<<8) /* implemented in software */ | |
40 | #define _PAGE_ACCESSED (1<<9) /* implemented in software */ | |
41 | #define _PAGE_MODIFIED (1<<10) /* implemented in software */ | |
bec50527 | 42 | #define _PAGE_FILE (1<<10) /* set:pagecache unset:swap */ |
1da177e4 LT |
43 | |
44 | #define _PAGE_R4KBUG (1<<0) /* workaround for r4k bug */ | |
45 | #define _PAGE_GLOBAL (1<<0) | |
46 | #define _PAGE_VALID (1<<1) | |
47 | #define _PAGE_SILENT_READ (1<<1) /* synonym */ | |
48 | #define _PAGE_DIRTY (1<<2) /* The MIPS dirty bit */ | |
49 | #define _PAGE_SILENT_WRITE (1<<2) | |
bec50527 | 50 | #define _CACHE_SHIFT 3 |
1da177e4 LT |
51 | #define _CACHE_MASK (7<<3) |
52 | ||
1da177e4 LT |
53 | #else |
54 | ||
55 | #define _PAGE_PRESENT (1<<0) /* implemented in software */ | |
56 | #define _PAGE_READ (1<<1) /* implemented in software */ | |
57 | #define _PAGE_WRITE (1<<2) /* implemented in software */ | |
58 | #define _PAGE_ACCESSED (1<<3) /* implemented in software */ | |
59 | #define _PAGE_MODIFIED (1<<4) /* implemented in software */ | |
60 | #define _PAGE_FILE (1<<4) /* set:pagecache unset:swap */ | |
61 | ||
62 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
63 | ||
64 | #define _PAGE_GLOBAL (1<<8) | |
65 | #define _PAGE_VALID (1<<9) | |
66 | #define _PAGE_SILENT_READ (1<<9) /* synonym */ | |
67 | #define _PAGE_DIRTY (1<<10) /* The MIPS dirty bit */ | |
68 | #define _PAGE_SILENT_WRITE (1<<10) | |
69 | #define _CACHE_UNCACHED (1<<11) | |
70 | #define _CACHE_MASK (1<<11) | |
1da177e4 LT |
71 | |
72 | #else | |
bec50527 | 73 | |
1da177e4 | 74 | #define _PAGE_R4KBUG (1<<5) /* workaround for r4k bug */ |
dd794392 | 75 | #define _PAGE_HUGE (1<<5) /* huge tlb page */ |
1da177e4 LT |
76 | #define _PAGE_GLOBAL (1<<6) |
77 | #define _PAGE_VALID (1<<7) | |
78 | #define _PAGE_SILENT_READ (1<<7) /* synonym */ | |
79 | #define _PAGE_DIRTY (1<<8) /* The MIPS dirty bit */ | |
80 | #define _PAGE_SILENT_WRITE (1<<8) | |
bec50527 | 81 | #define _CACHE_SHIFT 9 |
1da177e4 LT |
82 | #define _CACHE_MASK (7<<9) |
83 | ||
bec50527 CD |
84 | #endif |
85 | #endif /* defined(CONFIG_64BIT_PHYS_ADDR && defined(CONFIG_CPU_MIPS32) */ | |
86 | ||
87 | ||
88 | /* | |
89 | * Cache attributes | |
90 | */ | |
91 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
92 | ||
93 | #define _CACHE_CACHABLE_NONCOHERENT 0 | |
94 | ||
95 | #elif defined(CONFIG_CPU_SB1) | |
1da177e4 LT |
96 | |
97 | /* No penalty for being coherent on the SB1, so just | |
98 | use it for "noncoherent" spaces, too. Shouldn't hurt. */ | |
99 | ||
bec50527 CD |
100 | #define _CACHE_UNCACHED (2<<_CACHE_SHIFT) |
101 | #define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT) | |
102 | #define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT) | |
103 | #define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT) | |
1da177e4 LT |
104 | |
105 | #elif defined(CONFIG_CPU_RM9000) | |
106 | ||
bec50527 CD |
107 | #define _CACHE_WT (0<<_CACHE_SHIFT) |
108 | #define _CACHE_WTWA (1<<_CACHE_SHIFT) | |
109 | #define _CACHE_UC_B (2<<_CACHE_SHIFT) | |
110 | #define _CACHE_WB (3<<_CACHE_SHIFT) | |
111 | #define _CACHE_CWBEA (4<<_CACHE_SHIFT) | |
112 | #define _CACHE_CWB (5<<_CACHE_SHIFT) | |
113 | #define _CACHE_UCNB (6<<_CACHE_SHIFT) | |
114 | #define _CACHE_FPC (7<<_CACHE_SHIFT) | |
1da177e4 | 115 | |
bec50527 CD |
116 | #define _CACHE_UNCACHED _CACHE_UC_B |
117 | #define _CACHE_CACHABLE_NONCOHERENT _CACHE_WB | |
1da177e4 LT |
118 | |
119 | #else | |
120 | ||
bec50527 CD |
121 | #define _CACHE_CACHABLE_NO_WA (0<<_CACHE_SHIFT) /* R4600 only */ |
122 | #define _CACHE_CACHABLE_WA (1<<_CACHE_SHIFT) /* R4600 only */ | |
123 | #define _CACHE_UNCACHED (2<<_CACHE_SHIFT) /* R4[0246]00 */ | |
124 | #define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT) /* R4[0246]00 */ | |
125 | #define _CACHE_CACHABLE_CE (4<<_CACHE_SHIFT) /* R4[04]00MC only */ | |
126 | #define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT) /* R4[04]00MC only */ | |
127 | #define _CACHE_CACHABLE_COHERENT (5<<_CACHE_SHIFT) /* MIPS32R2 CMP */ | |
128 | #define _CACHE_CACHABLE_CUW (6<<_CACHE_SHIFT) /* R4[04]00MC only */ | |
129 | #define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT) /* R10000 only */ | |
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130 | |
131 | #endif | |
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132 | |
133 | #define __READABLE (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED) | |
134 | #define __WRITEABLE (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED) | |
135 | ||
136 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | _CACHE_MASK) | |
137 | ||
1da177e4 | 138 | #endif /* _ASM_PGTABLE_BITS_H */ |