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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Included from asm/pgtable-*.h only ! */
   3
   4 /*
   5  * Some bits are only used on some cpu families... Make sure that all
   6  * the undefined gets a sensible default
   7  */
   8 #ifndef _PAGE_HASHPTE
   9 #define _PAGE_HASHPTE   0
  10 #endif
  11 #ifndef _PAGE_SHARED
  12 #define _PAGE_SHARED    0
  13 #endif
  14 #ifndef _PAGE_HWWRITE
  15 #define _PAGE_HWWRITE   0
  16 #endif
  17 #ifndef _PAGE_EXEC
  18 #define _PAGE_EXEC      0
  19 #endif
  20 #ifndef _PAGE_ENDIAN
  21 #define _PAGE_ENDIAN    0
  22 #endif
  23 #ifndef _PAGE_COHERENT
  24 #define _PAGE_COHERENT  0
  25 #endif
  26 #ifndef _PAGE_WRITETHRU
  27 #define _PAGE_WRITETHRU 0
  28 #endif
  29 #ifndef _PAGE_4K_PFN
  30 #define _PAGE_4K_PFN            0
  31 #endif
  32 #ifndef _PAGE_SAO
  33 #define _PAGE_SAO       0
  34 #endif
  35 #ifndef _PAGE_PSIZE
  36 #define _PAGE_PSIZE             0
  37 #endif
  38 /* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
  39 #ifndef _PAGE_RO
  40 #define _PAGE_RO 0
  41 #else
  42 #define _PAGE_RW 0
  43 #endif
  44
  45 #ifndef _PAGE_PTE
  46 #define _PAGE_PTE 0
  47 #endif
  48
  49 #ifndef _PMD_PRESENT_MASK
  50 #define _PMD_PRESENT_MASK       _PMD_PRESENT
  51 #endif
  52 #ifndef _PMD_SIZE
  53 #define _PMD_SIZE       0
  54 #define PMD_PAGE_SIZE(pmd)      bad_call_to_PMD_PAGE_SIZE()
  55 #endif
  56 #ifndef _PAGE_KERNEL_RO
  57 #define _PAGE_KERNEL_RO         (_PAGE_RO)
  58 #endif
  59 #ifndef _PAGE_KERNEL_ROX
  60 #define _PAGE_KERNEL_ROX        (_PAGE_EXEC | _PAGE_RO)
  61 #endif
  62 #ifndef _PAGE_KERNEL_RW
  63 #define _PAGE_KERNEL_RW         (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
  64 #endif
  65 #ifndef _PAGE_KERNEL_RWX
  66 #define _PAGE_KERNEL_RWX        (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
  67 #endif
  68 #ifndef _PAGE_HPTEFLAGS
  69 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE
  70 #endif
  71 #ifndef _PTE_NONE_MASK
  72 #define _PTE_NONE_MASK  _PAGE_HPTEFLAGS
  73 #endif
  74
  75 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
  76  * kernel without large page PMD support
  77  */
  78 #ifndef __ASSEMBLY__
  79 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
  80
  81 /*
  82  * Don't just check for any non zero bits in __PAGE_USER, since for book3e
  83  * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
  84  * _PAGE_USER.  Need to explicitly match _PAGE_BAP_UR bit in that case too.
  85  */
  86 static inline bool pte_user(pte_t pte)
  87 {
  88         return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
  89 }
  90 #endif /* __ASSEMBLY__ */
  91
  92 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
  93  * as _PAGE_SHIFT here (ie, naturally aligned).
  94  * Platform who don't just pre-define the value so we don't override it here
  95  */
  96 #ifndef PTE_RPN_SHIFT
  97 #define PTE_RPN_SHIFT   (PAGE_SHIFT)
  98 #endif
  99
 100 /* The mask covered by the RPN must be a ULL on 32-bit platforms with
 101  * 64-bit PTEs
 102  */
 103 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
 104 #define PTE_RPN_MASK    (~((1ULL<<PTE_RPN_SHIFT)-1))
 105 #else
 106 #define PTE_RPN_MASK    (~((1UL<<PTE_RPN_SHIFT)-1))
 107 #endif
 108
 109 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
 110  * pgprot changes
 111  */
 112 #define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
 113                          _PAGE_ACCESSED | _PAGE_SPECIAL)
 114
 115 /* Mask of bits returned by pte_pgprot() */
 116 #define PAGE_PROT_BITS  (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
 117                          _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
 118                          _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
 119                          _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
 120
 121 /*
 122  * We define 2 sets of base prot bits, one for basic pages (ie,
 123  * cacheable kernel and user pages) and one for non cacheable
 124  * pages. We always set _PAGE_COHERENT when SMP is enabled or
 125  * the processor might need it for DMA coherency.
 126  */
 127 #define _PAGE_BASE_NC   (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
 128 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
 129         defined(CONFIG_PPC_E500MC)
 130 #define _PAGE_BASE      (_PAGE_BASE_NC | _PAGE_COHERENT)
 131 #else
 132 #define _PAGE_BASE      (_PAGE_BASE_NC)
 133 #endif
 134
 135 /* Permission masks used to generate the __P and __S table,
 136  *
 137  * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
 138  *
 139  * Write permissions imply read permissions for now (we could make write-only
 140  * pages on BookE but we don't bother for now). Execute permission control is
 141  * possible on platforms that define _PAGE_EXEC
 142  *
 143  * Note due to the way vm flags are laid out, the bits are XWR
 144  */
 145 #define PAGE_NONE       __pgprot(_PAGE_BASE)
 146 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
 147 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
 148                                  _PAGE_EXEC)
 149 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 150 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 151                                  _PAGE_EXEC)
 152 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 153 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 154                                  _PAGE_EXEC)
 155
 156 #define __P000  PAGE_NONE
 157 #define __P001  PAGE_READONLY
 158 #define __P010  PAGE_COPY
 159 #define __P011  PAGE_COPY
 160 #define __P100  PAGE_READONLY_X
 161 #define __P101  PAGE_READONLY_X
 162 #define __P110  PAGE_COPY_X
 163 #define __P111  PAGE_COPY_X
 164
 165 #define __S000  PAGE_NONE
 166 #define __S001  PAGE_READONLY
 167 #define __S010  PAGE_SHARED
 168 #define __S011  PAGE_SHARED
 169 #define __S100  PAGE_READONLY_X
 170 #define __S101  PAGE_READONLY_X
 171 #define __S110  PAGE_SHARED_X
 172 #define __S111  PAGE_SHARED_X
 173
 174 /* Permission masks used for kernel mappings */
 175 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
 176 #define PAGE_KERNEL_NC  __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 177                                  _PAGE_NO_CACHE)
 178 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 179                                  _PAGE_NO_CACHE | _PAGE_GUARDED)
 180 #define PAGE_KERNEL_X   __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
 181 #define PAGE_KERNEL_RO  __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
 182 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
 183
 184 /* Protection used for kernel text. We want the debuggers to be able to
 185  * set breakpoints anywhere, so don't write protect the kernel text
 186  * on platforms where such control is possible.
 187  */
 188 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
 189         defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
 190 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_X
 191 #else
 192 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_ROX
 193 #endif
 194
 195 /* Make modules code happy. We don't set RO yet */
 196 #define PAGE_KERNEL_EXEC        PAGE_KERNEL_X
 197
 198 /* Advertise special mapping type for AGP */
 199 #define PAGE_AGP                (PAGE_KERNEL_NC)
 200 #define HAVE_PAGE_AGP
 201
 202 /* Advertise support for _PAGE_SPECIAL */
 203 #define __HAVE_ARCH_PTE_SPECIAL
 204
 205 #ifndef _PAGE_READ
 206 /* if not defined, we should not find _PAGE_WRITE too */
 207 #define _PAGE_READ 0
 208 #define _PAGE_WRITE _PAGE_RW
 209 #endif
 210
 211 #ifndef H_PAGE_4K_PFN
 212 #define H_PAGE_4K_PFN 0
 213 #endif