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__ 73extern 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