arch/powerpc/include/asm/pte-common.h

   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__
  78 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
  79
  80 /*
  81  * Don't just check for any non zero bits in __PAGE_USER, since for book3e
  82  * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
  83  * _PAGE_USER.  Need to explicitly match _PAGE_BAP_UR bit in that case too.
  84  */
  85 static inline bool pte_user(pte_t pte)
  86 {
  87         return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
  88 }
  89 #endif /* __ASSEMBLY__ */
  90
  91 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
  92  * as _PAGE_SHIFT here (ie, naturally aligned).
  93  * Platform who don't just pre-define the value so we don't override it here
  94  */
  95 #ifndef PTE_RPN_SHIFT
  96 #define PTE_RPN_SHIFT   (PAGE_SHIFT)
  97 #endif
  98
  99 /* The mask covered by the RPN must be a ULL on 32-bit platforms with
 100  * 64-bit PTEs
 101  */
 102 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
 103 #define PTE_RPN_MASK    (~((1ULL<<PTE_RPN_SHIFT)-1))
 104 #else
 105 #define PTE_RPN_MASK    (~((1UL<<PTE_RPN_SHIFT)-1))
 106 #endif
 107
 108 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
 109  * pgprot changes
 110  */
 111 #define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
 112                          _PAGE_ACCESSED | _PAGE_SPECIAL)
 113
 114 /* Mask of bits returned by pte_pgprot() */
 115 #define PAGE_PROT_BITS  (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
 116                          _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
 117                          _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
 118                          _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
 119
 120 /*
 121  * We define 2 sets of base prot bits, one for basic pages (ie,
 122  * cacheable kernel and user pages) and one for non cacheable
 123  * pages. We always set _PAGE_COHERENT when SMP is enabled or
 124  * the processor might need it for DMA coherency.
 125  */
 126 #define _PAGE_BASE_NC   (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
 127 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
 128         defined(CONFIG_PPC_E500MC)
 129 #define _PAGE_BASE      (_PAGE_BASE_NC | _PAGE_COHERENT)
 130 #else
 131 #define _PAGE_BASE      (_PAGE_BASE_NC)
 132 #endif
 133
 134 /* Permission masks used to generate the __P and __S table,
 135  *
 136  * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
 137  *
 138  * Write permissions imply read permissions for now (we could make write-only
 139  * pages on BookE but we don't bother for now). Execute permission control is
 140  * possible on platforms that define _PAGE_EXEC
 141  *
 142  * Note due to the way vm flags are laid out, the bits are XWR
 143  */
 144 #define PAGE_NONE       __pgprot(_PAGE_BASE)
 145 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
 146 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
 147                                  _PAGE_EXEC)
 148 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 149 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 150                                  _PAGE_EXEC)
 151 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 152 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 153                                  _PAGE_EXEC)
 154
 155 #define __P000  PAGE_NONE
 156 #define __P001  PAGE_READONLY
 157 #define __P010  PAGE_COPY
 158 #define __P011  PAGE_COPY
 159 #define __P100  PAGE_READONLY_X
 160 #define __P101  PAGE_READONLY_X
 161 #define __P110  PAGE_COPY_X
 162 #define __P111  PAGE_COPY_X
 163
 164 #define __S000  PAGE_NONE
 165 #define __S001  PAGE_READONLY
 166 #define __S010  PAGE_SHARED
 167 #define __S011  PAGE_SHARED
 168 #define __S100  PAGE_READONLY_X
 169 #define __S101  PAGE_READONLY_X
 170 #define __S110  PAGE_SHARED_X
 171 #define __S111  PAGE_SHARED_X
 172
 173 /* Permission masks used for kernel mappings */
 174 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
 175 #define PAGE_KERNEL_NC  __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 176                                  _PAGE_NO_CACHE)
 177 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 178                                  _PAGE_NO_CACHE | _PAGE_GUARDED)
 179 #define PAGE_KERNEL_X   __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
 180 #define PAGE_KERNEL_RO  __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
 181 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
 182
 183 /* Protection used for kernel text. We want the debuggers to be able to
 184  * set breakpoints anywhere, so don't write protect the kernel text
 185  * on platforms where such control is possible.
 186  */
 187 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
 188         defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
 189 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_X
 190 #else
 191 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_ROX
 192 #endif
 193
 194 /* Make modules code happy. We don't set RO yet */
 195 #define PAGE_KERNEL_EXEC        PAGE_KERNEL_X
 196
 197 /* Advertise special mapping type for AGP */
 198 #define PAGE_AGP                (PAGE_KERNEL_NC)
 199 #define HAVE_PAGE_AGP
 200
 201 /* Advertise support for _PAGE_SPECIAL */
 202 #define __HAVE_ARCH_PTE_SPECIAL
 203
 204 #ifndef _PAGE_READ
 205 /* if not defined, we should not find _PAGE_WRITE too */
 206 #define _PAGE_READ 0
 207 #define _PAGE_WRITE _PAGE_RW
 208 #endif
 209
 210 #ifndef H_PAGE_4K_PFN
 211 #define H_PAGE_4K_PFN 0
 212 #endif