release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/include/asm/pte-hash64.h

   1 #ifndef _ASM_POWERPC_PTE_HASH64_H
   2 #define _ASM_POWERPC_PTE_HASH64_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * Common bits between 4K and 64K pages in a linux-style PTE.
   7  * These match the bits in the (hardware-defined) PowerPC PTE as closely
   8  * as possible. Additional bits may be defined in pgtable-hash64-*.h
   9  *
  10  * Note: We only support user read/write permissions. Supervisor always
  11  * have full read/write to pages above PAGE_OFFSET (pages below that
  12  * always use the user access permissions).
  13  *
  14  * We could create separate kernel read-only if we used the 3 PP bits
  15  * combinations that newer processors provide but we currently don't.
  16  */
  17 #define _PAGE_PRESENT           0x0001 /* software: pte contains a translation */
  18 #define _PAGE_USER              0x0002 /* matches one of the PP bits */
  19 #define _PAGE_FILE              0x0002 /* (!present only) software: pte holds file offset */
  20 #define _PAGE_EXEC              0x0004 /* No execute on POWER4 and newer (we invert) */
  21 #define _PAGE_GUARDED           0x0008
  22 #define _PAGE_COHERENT          0x0010 /* M: enforce memory coherence (SMP systems) */
  23 #define _PAGE_NO_CACHE          0x0020 /* I: cache inhibit */
  24 #define _PAGE_WRITETHRU         0x0040 /* W: cache write-through */
  25 #define _PAGE_DIRTY             0x0080 /* C: page changed */
  26 #define _PAGE_ACCESSED          0x0100 /* R: page referenced */
  27 #define _PAGE_RW                0x0200 /* software: user write access allowed */
  28 #define _PAGE_BUSY              0x0800 /* software: PTE & hash are busy */
  29
  30 /* No separate kernel read-only */
  31 #define _PAGE_KERNEL_RW         (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */
  32 #define _PAGE_KERNEL_RO          _PAGE_KERNEL_RW
  33
  34 /* Strong Access Ordering */
  35 #define _PAGE_SAO               (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT)
  36
  37 /* No page size encoding in the linux PTE */
  38 #define _PAGE_PSIZE             0
  39
  40 /* PTEIDX nibble */
  41 #define _PTEIDX_SECONDARY       0x8
  42 #define _PTEIDX_GROUP_IX        0x7
  43
  44 /* Hash table based platforms need atomic updates of the linux PTE */
  45 #define PTE_ATOMIC_UPDATES      1
  46
  47 #ifdef CONFIG_PPC_64K_PAGES
  48 #include <asm/pte-hash64-64k.h>
  49 #else
  50 #include <asm/pte-hash64-4k.h>
  51 #endif
  52
  53 #endif /* __KERNEL__ */
  54 #endif /*  _ASM_POWERPC_PTE_HASH64_H */