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 /* _PAGE_RO and _PAGE_RW shall not be defined at the same time */ 38 #ifndef _PAGE_RO 39 #define _PAGE_RO 0 40 #else 41 #define _PAGE_RW 0 42 #endif 43 #ifndef _PMD_PRESENT_MASK 44 #define _PMD_PRESENT_MASK _PMD_PRESENT 45 #endif 46 #ifndef _PMD_SIZE 47 #define _PMD_SIZE 0 48 #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE() 49 #endif 50 #ifndef _PAGE_KERNEL_RO 51 #define _PAGE_KERNEL_RO (_PAGE_RO) 52 #endif 53 #ifndef _PAGE_KERNEL_ROX 54 #define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO) 55 #endif 56 #ifndef _PAGE_KERNEL_RW 57 #define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE) 58 #endif 59 #ifndef _PAGE_KERNEL_RWX 60 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC) 61 #endif 62 #ifndef _PAGE_HPTEFLAGS 63 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE 64 #endif 65 #ifndef _PTE_NONE_MASK 66 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS 67 #endif 68 69 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a 70 * kernel without large page PMD support 71 */ 72 #ifndef __ASSEMBLY__ 73 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); 74 #endif /* __ASSEMBLY__ */ 75 76 /* Location of the PFN in the PTE. Most 32-bit platforms use the same 77 * as _PAGE_SHIFT here (ie, naturally aligned). 78 * Platform who don't just pre-define the value so we don't override it here 79 */ 80 #ifndef PTE_RPN_SHIFT 81 #define PTE_RPN_SHIFT (PAGE_SHIFT) 82 #endif 83 84 /* The mask convered by the RPN must be a ULL on 32-bit platforms with 85 * 64-bit PTEs 86 */ 87 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT) 88 #define PTE_RPN_MAX (1ULL << (64 - PTE_RPN_SHIFT)) 89 #define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1)) 90 #else 91 #define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT)) 92 #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) 93 #endif 94 95 /* _PAGE_CHG_MASK masks of bits that are to be preserved across 96 * pgprot changes 97 */ 98 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ 99 _PAGE_ACCESSED | _PAGE_SPECIAL) 100 101 /* Mask of bits returned by pte_pgprot() */ 102 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \ 103 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \ 104 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \ 105 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC) 106 107 /* 108 * We define 2 sets of base prot bits, one for basic pages (ie, 109 * cacheable kernel and user pages) and one for non cacheable 110 * pages. We always set _PAGE_COHERENT when SMP is enabled or 111 * the processor might need it for DMA coherency. 112 */ 113 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE) 114 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) 115 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT) 116 #else 117 #define _PAGE_BASE (_PAGE_BASE_NC) 118 #endif 119 120 /* Permission masks used to generate the __P and __S table, 121 * 122 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h 123 * 124 * Write permissions imply read permissions for now (we could make write-only 125 * pages on BookE but we don't bother for now). Execute permission control is 126 * possible on platforms that define _PAGE_EXEC 127 * 128 * Note due to the way vm flags are laid out, the bits are XWR 129 */ 130 #define PAGE_NONE __pgprot(_PAGE_BASE) 131 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) 132 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \ 133 _PAGE_EXEC) 134 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO) 135 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \ 136 _PAGE_EXEC) 137 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO) 138 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \ 139 _PAGE_EXEC) 140 141 #define __P000 PAGE_NONE 142 #define __P001 PAGE_READONLY 143 #define __P010 PAGE_COPY 144 #define __P011 PAGE_COPY 145 #define __P100 PAGE_READONLY_X 146 #define __P101 PAGE_READONLY_X 147 #define __P110 PAGE_COPY_X 148 #define __P111 PAGE_COPY_X 149 150 #define __S000 PAGE_NONE 151 #define __S001 PAGE_READONLY 152 #define __S010 PAGE_SHARED 153 #define __S011 PAGE_SHARED 154 #define __S100 PAGE_READONLY_X 155 #define __S101 PAGE_READONLY_X 156 #define __S110 PAGE_SHARED_X 157 #define __S111 PAGE_SHARED_X 158 159 /* Permission masks used for kernel mappings */ 160 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) 161 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 162 _PAGE_NO_CACHE) 163 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 164 _PAGE_NO_CACHE | _PAGE_GUARDED) 165 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) 166 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) 167 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) 168 169 /* Protection used for kernel text. We want the debuggers to be able to 170 * set breakpoints anywhere, so don't write protect the kernel text 171 * on platforms where such control is possible. 172 */ 173 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\ 174 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE) 175 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X 176 #else 177 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX 178 #endif 179 180 /* Make modules code happy. We don't set RO yet */ 181 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X 182 183 /* 184 * Don't just check for any non zero bits in __PAGE_USER, since for book3e 185 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in 186 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too. 187 */ 188 #define pte_user(val) ((val & _PAGE_USER) == _PAGE_USER) 189 190 /* Advertise special mapping type for AGP */ 191 #define PAGE_AGP (PAGE_KERNEL_NC) 192 #define HAVE_PAGE_AGP 193 194 /* Advertise support for _PAGE_SPECIAL */ 195 #define __HAVE_ARCH_PTE_SPECIAL 196 197