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) || defined(CONFIG_DYNAMIC_FTRACE) 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 187 188