projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 71087002 BH |
1 | /* Included from asm/pgtable-*.h only ! */ |
| 2 | ||
| 3 | /* | |
| 4 | * Some bits are only used on some cpu families... Make sure that all | |
| 5 | * the undefined gets a sensible default | |
| 6 | */ | |
| 7 | #ifndef _PAGE_HASHPTE | |
| 8 | #define _PAGE_HASHPTE 0 | |
| 9 | #endif | |
| 10 | #ifndef _PAGE_SHARED | |
| 11 | #define _PAGE_SHARED 0 | |
| 12 | #endif | |
| 13 | #ifndef _PAGE_HWWRITE | |
| 14 | #define _PAGE_HWWRITE 0 | |
| 15 | #endif | |
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16 | #ifndef _PAGE_EXEC |
| 17 | #define _PAGE_EXEC 0 | |
| 18 | #endif | |
| 19 | #ifndef _PAGE_ENDIAN | |
| 20 | #define _PAGE_ENDIAN 0 | |
| 21 | #endif | |
| 22 | #ifndef _PAGE_COHERENT | |
| 23 | #define _PAGE_COHERENT 0 | |
| 24 | #endif | |
| 25 | #ifndef _PAGE_WRITETHRU | |
| 26 | #define _PAGE_WRITETHRU 0 | |
| 27 | #endif | |
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28 | #ifndef _PAGE_4K_PFN |
| 29 | #define _PAGE_4K_PFN 0 | |
| 30 | #endif | |
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31 | #ifndef _PAGE_SAO |
| 32 | #define _PAGE_SAO 0 | |
| 33 | #endif | |
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34 | #ifndef _PAGE_PSIZE |
| 35 | #define _PAGE_PSIZE 0 | |
| 36 | #endif | |
| 37 | #ifndef _PMD_PRESENT_MASK | |
| 38 | #define _PMD_PRESENT_MASK _PMD_PRESENT | |
| 39 | #endif | |
| 40 | #ifndef _PMD_SIZE | |
| 41 | #define _PMD_SIZE 0 | |
| 42 | #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE() | |
| 43 | #endif | |
| 44 | #ifndef _PAGE_KERNEL_RO | |
| ea3cc330 BH |
45 | #define _PAGE_KERNEL_RO 0 |
| 46 | #endif | |
| 47 | #ifndef _PAGE_KERNEL_ROX | |
| 48 | #define _PAGE_KERNEL_ROX (_PAGE_EXEC) | |
| 71087002 BH |
49 | #endif |
| 50 | #ifndef _PAGE_KERNEL_RW | |
| ea3cc330 BH |
51 | #define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE) |
| 52 | #endif | |
| 53 | #ifndef _PAGE_KERNEL_RWX | |
| 54 | #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC) | |
| 71087002 BH |
55 | #endif |
| 56 | #ifndef _PAGE_HPTEFLAGS | |
| 57 | #define _PAGE_HPTEFLAGS _PAGE_HASHPTE | |
| 58 | #endif | |
| 59 | #ifndef _PTE_NONE_MASK | |
| 60 | #define _PTE_NONE_MASK _PAGE_HPTEFLAGS | |
| 61 | #endif | |
| 62 | ||
| 63 | /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a | |
| 64 | * kernel without large page PMD support | |
| 65 | */ | |
| 66 | #ifndef __ASSEMBLY__ | |
| 67 | extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); | |
| 68 | #endif /* __ASSEMBLY__ */ | |
| 69 | ||
| 70 | /* Location of the PFN in the PTE. Most 32-bit platforms use the same | |
| 71 | * as _PAGE_SHIFT here (ie, naturally aligned). | |
| 72 | * Platform who don't just pre-define the value so we don't override it here | |
| 73 | */ | |
| 74 | #ifndef PTE_RPN_SHIFT | |
| 75 | #define PTE_RPN_SHIFT (PAGE_SHIFT) | |
| 76 | #endif | |
| 77 | ||
| 78 | /* The mask convered by the RPN must be a ULL on 32-bit platforms with | |
| 79 | * 64-bit PTEs | |
| 80 | */ | |
| 81 | #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT) | |
| 82 | #define PTE_RPN_MAX (1ULL << (64 - PTE_RPN_SHIFT)) | |
| 83 | #define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1)) | |
| 84 | #else | |
| 85 | #define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT)) | |
| 86 | #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) | |
| 87 | #endif | |
| 88 | ||
| 89 | /* _PAGE_CHG_MASK masks of bits that are to be preserved accross | |
| 90 | * pgprot changes | |
| 91 | */ | |
| 92 | #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ | |
| 93 | _PAGE_ACCESSED | _PAGE_SPECIAL) | |
| 94 | ||
| 95 | /* Mask of bits returned by pte_pgprot() */ | |
| 96 | #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \ | |
| 97 | _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \ | |
| 98 | _PAGE_USER | _PAGE_ACCESSED | \ | |
| ea3cc330 | 99 | _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC) |
| 71087002 BH |
100 | |
| 101 | /* | |
| 102 | * We define 2 sets of base prot bits, one for basic pages (ie, | |
| 103 | * cacheable kernel and user pages) and one for non cacheable | |
| 104 | * pages. We always set _PAGE_COHERENT when SMP is enabled or | |
| 105 | * the processor might need it for DMA coherency. | |
| 106 | */ | |
| 107 | #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE) | |
| 108 | #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) | |
| 109 | #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT) | |
| 110 | #else | |
| 111 | #define _PAGE_BASE (_PAGE_BASE_NC) | |
| 112 | #endif | |
| 113 | ||
| 114 | /* Permission masks used to generate the __P and __S table, | |
| 115 | * | |
| 116 | * Note:__pgprot is defined in arch/powerpc/include/asm/page.h | |
| 117 | * | |
| 118 | * Write permissions imply read permissions for now (we could make write-only | |
| 119 | * pages on BookE but we don't bother for now). Execute permission control is | |
| 120 | * possible on platforms that define _PAGE_EXEC | |
| 121 | * | |
| 122 | * Note due to the way vm flags are laid out, the bits are XWR | |
| 123 | */ | |
| 124 | #define PAGE_NONE __pgprot(_PAGE_BASE) | |
| 125 | #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) | |
| 126 | #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC) | |
| 127 | #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER) | |
| 128 | #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) | |
| 129 | #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER) | |
| 130 | #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) | |
| 131 | ||
| 132 | #define __P000 PAGE_NONE | |
| 133 | #define __P001 PAGE_READONLY | |
| 134 | #define __P010 PAGE_COPY | |
| 135 | #define __P011 PAGE_COPY | |
| 136 | #define __P100 PAGE_READONLY_X | |
| 137 | #define __P101 PAGE_READONLY_X | |
| 138 | #define __P110 PAGE_COPY_X | |
| 139 | #define __P111 PAGE_COPY_X | |
| 140 | ||
| 141 | #define __S000 PAGE_NONE | |
| 142 | #define __S001 PAGE_READONLY | |
| 143 | #define __S010 PAGE_SHARED | |
| 144 | #define __S011 PAGE_SHARED | |
| 145 | #define __S100 PAGE_READONLY_X | |
| 146 | #define __S101 PAGE_READONLY_X | |
| 147 | #define __S110 PAGE_SHARED_X | |
| 148 | #define __S111 PAGE_SHARED_X | |
| 149 | ||
| 150 | /* Permission masks used for kernel mappings */ | |
| 151 | #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) | |
| 152 | #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ | |
| 153 | _PAGE_NO_CACHE) | |
| 154 | #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ | |
| 155 | _PAGE_NO_CACHE | _PAGE_GUARDED) | |
| ea3cc330 | 156 | #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) |
| 71087002 | 157 | #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) |
| ea3cc330 | 158 | #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) |
| 71087002 BH |
159 | |
| 160 | /* Protection used for kernel text. We want the debuggers to be able to | |
| 161 | * set breakpoints anywhere, so don't write protect the kernel text | |
| 162 | * on platforms where such control is possible. | |
| 163 | */ | |
| 164 | #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\ | |
| 165 | defined(CONFIG_KPROBES) | |
| 166 | #define PAGE_KERNEL_TEXT PAGE_KERNEL_X | |
| 167 | #else | |
| 168 | #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX | |
| 169 | #endif | |
| 170 | ||
| 171 | /* Make modules code happy. We don't set RO yet */ | |
| 172 | #define PAGE_KERNEL_EXEC PAGE_KERNEL_X | |
| 173 | ||
| 174 | /* Advertise special mapping type for AGP */ | |
| 175 | #define PAGE_AGP (PAGE_KERNEL_NC) | |
| 176 | #define HAVE_PAGE_AGP | |
| 177 | ||
| 178 | /* Advertise support for _PAGE_SPECIAL */ | |
| 71087002 | 179 | #define __HAVE_ARCH_PTE_SPECIAL |
| 71087002 | 180 |