pte-common.h revision 11b55da700eb77905f1c2dde3a0cbeedc665a753
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_HWEXEC 17#define _PAGE_HWEXEC 0 18#endif 19#ifndef _PAGE_EXEC 20#define _PAGE_EXEC 0 21#endif 22#ifndef _PAGE_ENDIAN 23#define _PAGE_ENDIAN 0 24#endif 25#ifndef _PAGE_COHERENT 26#define _PAGE_COHERENT 0 27#endif 28#ifndef _PAGE_WRITETHRU 29#define _PAGE_WRITETHRU 0 30#endif 31#ifndef _PAGE_SPECIAL 32#define _PAGE_SPECIAL 0 33#endif 34#ifndef _PAGE_4K_PFN 35#define _PAGE_4K_PFN 0 36#endif 37#ifndef _PAGE_PSIZE 38#define _PAGE_PSIZE 0 39#endif 40#ifndef _PMD_PRESENT_MASK 41#define _PMD_PRESENT_MASK _PMD_PRESENT 42#endif 43#ifndef _PMD_SIZE 44#define _PMD_SIZE 0 45#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE() 46#endif 47#ifndef _PAGE_KERNEL_RO 48#define _PAGE_KERNEL_RO 0 49#endif 50#ifndef _PAGE_KERNEL_RW 51#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE) 52#endif 53#ifndef _PAGE_HPTEFLAGS 54#define _PAGE_HPTEFLAGS _PAGE_HASHPTE 55#endif 56#ifndef _PTE_NONE_MASK 57#define _PTE_NONE_MASK _PAGE_HPTEFLAGS 58#endif 59 60/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a 61 * kernel without large page PMD support 62 */ 63#ifndef __ASSEMBLY__ 64extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); 65#endif /* __ASSEMBLY__ */ 66 67/* Location of the PFN in the PTE. Most 32-bit platforms use the same 68 * as _PAGE_SHIFT here (ie, naturally aligned). 69 * Platform who don't just pre-define the value so we don't override it here 70 */ 71#ifndef PTE_RPN_SHIFT 72#define PTE_RPN_SHIFT (PAGE_SHIFT) 73#endif 74 75/* The mask convered by the RPN must be a ULL on 32-bit platforms with 76 * 64-bit PTEs 77 */ 78#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT) 79#define PTE_RPN_MAX (1ULL << (64 - PTE_RPN_SHIFT)) 80#define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1)) 81#else 82#define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT)) 83#define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) 84#endif 85 86/* _PAGE_CHG_MASK masks of bits that are to be preserved accross 87 * pgprot changes 88 */ 89#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ 90 _PAGE_ACCESSED | _PAGE_SPECIAL) 91 92/* Mask of bits returned by pte_pgprot() */ 93#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \ 94 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \ 95 _PAGE_USER | _PAGE_ACCESSED | \ 96 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | \ 97 _PAGE_EXEC | _PAGE_HWEXEC) 98 99/* 100 * We define 2 sets of base prot bits, one for basic pages (ie, 101 * cacheable kernel and user pages) and one for non cacheable 102 * pages. We always set _PAGE_COHERENT when SMP is enabled or 103 * the processor might need it for DMA coherency. 104 */ 105#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE) 106#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) 107#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT) 108#else 109#define _PAGE_BASE (_PAGE_BASE_NC) 110#endif 111 112/* Permission masks used to generate the __P and __S table, 113 * 114 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h 115 * 116 * Write permissions imply read permissions for now (we could make write-only 117 * pages on BookE but we don't bother for now). Execute permission control is 118 * possible on platforms that define _PAGE_EXEC 119 * 120 * Note due to the way vm flags are laid out, the bits are XWR 121 */ 122#define PAGE_NONE __pgprot(_PAGE_BASE) 123#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) 124#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC) 125#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER) 126#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) 127#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER) 128#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) 129 130#define __P000 PAGE_NONE 131#define __P001 PAGE_READONLY 132#define __P010 PAGE_COPY 133#define __P011 PAGE_COPY 134#define __P100 PAGE_READONLY_X 135#define __P101 PAGE_READONLY_X 136#define __P110 PAGE_COPY_X 137#define __P111 PAGE_COPY_X 138 139#define __S000 PAGE_NONE 140#define __S001 PAGE_READONLY 141#define __S010 PAGE_SHARED 142#define __S011 PAGE_SHARED 143#define __S100 PAGE_READONLY_X 144#define __S101 PAGE_READONLY_X 145#define __S110 PAGE_SHARED_X 146#define __S111 PAGE_SHARED_X 147 148/* Permission masks used for kernel mappings */ 149#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) 150#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 151 _PAGE_NO_CACHE) 152#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ 153 _PAGE_NO_CACHE | _PAGE_GUARDED) 154#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC | \ 155 _PAGE_HWEXEC) 156#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) 157#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC | \ 158 _PAGE_HWEXEC) 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 */ 179#ifdef _PAGE_SPECIAL 180#define __HAVE_ARCH_PTE_SPECIAL 181#endif 182 183