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 44#ifndef _PAGE_PTE 45#define _PAGE_PTE 0 46#endif 47 48#ifndef _PMD_PRESENT_MASK 49#define _PMD_PRESENT_MASK _PMD_PRESENT 50#endif 51#ifndef _PMD_SIZE 52#define _PMD_SIZE 0 53#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE() 54#endif 55#ifndef _PAGE_KERNEL_RO 56#define _PAGE_KERNEL_RO (_PAGE_RO) 57#endif 58#ifndef _PAGE_KERNEL_ROX 59#define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO) 60#endif 61#ifndef _PAGE_KERNEL_RW 62#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE) 63#endif 64#ifndef _PAGE_KERNEL_RWX 65#define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC) 66#endif 67#ifndef _PAGE_HPTEFLAGS 68#define _PAGE_HPTEFLAGS _PAGE_HASHPTE 69#endif 70#ifndef _PTE_NONE_MASK 71#define _PTE_NONE_MASK _PAGE_HPTEFLAGS 72#endif 73 74/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a 75 * kernel without large page PMD support 76 */ 77#ifndef __ASSEMBLY__ 78extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); 79#endif /* __ASSEMBLY__ */ 80 81/* Location of the PFN in the PTE. Most 32-bit platforms use the same 82 * as _PAGE_SHIFT here (ie, naturally aligned). 83 * Platform who don't just pre-define the value so we don't override it here 84 */ 85#ifndef PTE_RPN_SHIFT 86#define PTE_RPN_SHIFT (PAGE_SHIFT) 87#endif 88 89/* The mask convered by the RPN must be a ULL on 32-bit platforms with 90 * 64-bit PTEs 91 */ 92#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT) 93#define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1)) 94#else 95#define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) 96#endif 97 98/* _PAGE_CHG_MASK masks of bits that are to be preserved across 99 * pgprot changes 100 */ 101#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ 102 _PAGE_ACCESSED | _PAGE_SPECIAL) 103 104/* Mask of bits returned by pte_pgprot() */ 105#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \ 106 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \ 107 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \ 108 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC) 109 110/* 111 * We define 2 sets of base prot bits, one for basic pages (ie, 112 * cacheable kernel and user pages) and one for non cacheable 113 * pages. We always set _PAGE_COHERENT when SMP is enabled or 114 * the processor might need it for DMA coherency. 115 */ 116#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE) 117#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \ 118 defined(CONFIG_PPC_E500MC) 119#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT) 120#else 121#define _PAGE_BASE (_PAGE_BASE_NC) 122#endif 123 124/* Permission masks used to generate the __P and __S table, 125 * 126 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h 127 * 128 * Write permissions imply read permissions for now (we could make write-only 129 * pages on BookE but we don't bother for now). Execute permission control is 130 * possible on platforms that define _PAGE_EXEC 131 * 132 * Note due to the way vm flags are laid out, the bits are XWR 133 */ 134#define PAGE_NONE __pgprot(_PAGE_BASE) 135#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) 136#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \ 137 _PAGE_EXEC) 138#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO) 139#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \ 140 _PAGE_EXEC) 141#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO) 142#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \ 143 _PAGE_EXEC) 144 145#define __P000 PAGE_NONE 146#define __P001 PAGE_READONLY 147#define __P010 PAGE_COPY 148#define __P011 PAGE_COPY 149#define __P100 PAGE_READONLY_X 150#define __P101 PAGE_READONLY_X 151#define __P110 PAGE_COPY_X 152#define __P111 PAGE_COPY_X 153 154#define __S000 PAGE_NONE 155#define __S001 PAGE_READONLY 156#define __S010 PAGE_SHARED 157#define __S011 PAGE_SHARED 158#define __S100 PAGE_READONLY_X 159#define __S101 PAGE_READONLY_X 160#define __S110 PAGE_SHARED_X 161#define __S111 PAGE_SHARED_X 162 163/* Permission masks used for kernel mappings */ 164#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) 165#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 166 _PAGE_NO_CACHE) 167#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 168 _PAGE_NO_CACHE | _PAGE_GUARDED) 169#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) 170#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) 171#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) 172 173/* Protection used for kernel text. We want the debuggers to be able to 174 * set breakpoints anywhere, so don't write protect the kernel text 175 * on platforms where such control is possible. 176 */ 177#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\ 178 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE) 179#define PAGE_KERNEL_TEXT PAGE_KERNEL_X 180#else 181#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX 182#endif 183 184/* Make modules code happy. We don't set RO yet */ 185#define PAGE_KERNEL_EXEC PAGE_KERNEL_X 186 187/* 188 * Don't just check for any non zero bits in __PAGE_USER, since for book3e 189 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in 190 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too. 191 */ 192#define pte_user(val) ((val & _PAGE_USER) == _PAGE_USER) 193 194/* Advertise special mapping type for AGP */ 195#define PAGE_AGP (PAGE_KERNEL_NC) 196#define HAVE_PAGE_AGP 197 198/* Advertise support for _PAGE_SPECIAL */ 199#define __HAVE_ARCH_PTE_SPECIAL 200 201