| | 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 |
| | 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 |
| | 28 | #ifndef _PAGE_4K_PFN |
| | 29 | #define _PAGE_4K_PFN 0 |
| | 30 | #endif |
| | 31 | #ifndef _PAGE_SAO |
| | 32 | #define _PAGE_SAO 0 |
| | 33 | #endif |
| | 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 |
| | 45 | #define _PAGE_KERNEL_RO 0 |
| | 46 | #endif |
| | 47 | #ifndef _PAGE_KERNEL_ROX |
| | 48 | #define _PAGE_KERNEL_ROX (_PAGE_EXEC) |
| | 49 | #endif |
| | 50 | #ifndef _PAGE_KERNEL_RW |
| | 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) |
| | 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 across |
| | 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 | \ |
| | 99 | _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC) |
| | 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) |
| | 156 | #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) |
| | 157 | #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) |
| | 158 | #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) |
| | 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 | /* |
| | 175 | * Don't just check for any non zero bits in __PAGE_USER, since for book3e |
| | 176 | * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in |
| | 177 | * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too. |
| | 178 | */ |
| | 179 | #define pte_user(val) ((val & _PAGE_USER) == _PAGE_USER) |
| | 180 | |
| | 181 | /* Advertise special mapping type for AGP */ |
| | 182 | #define PAGE_AGP (PAGE_KERNEL_NC) |
| | 183 | #define HAVE_PAGE_AGP |
| | 184 | |
| | 185 | /* Advertise support for _PAGE_SPECIAL */ |
| | 186 | #define __HAVE_ARCH_PTE_SPECIAL |
| | 187 | |
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