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_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__
  64 extern 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