arch/metag/include/asm/pgtable-bits.h

   1 /*
   2  * Meta page table definitions.
   3  */
   4
   5 #ifndef _METAG_PGTABLE_BITS_H
   6 #define _METAG_PGTABLE_BITS_H
   7
   8 #include <asm/metag_mem.h>
   9
  10 /*
  11  * Definitions for MMU descriptors
  12  *
  13  * These are the hardware bits in the MMCU pte entries.
  14  * Derived from the Meta toolkit headers.
  15  */
  16 #define _PAGE_PRESENT           MMCU_ENTRY_VAL_BIT
  17 #define _PAGE_WRITE             MMCU_ENTRY_WR_BIT
  18 #define _PAGE_PRIV              MMCU_ENTRY_PRIV_BIT
  19 /* Write combine bit - this can cause writes to occur out of order */
  20 #define _PAGE_WR_COMBINE        MMCU_ENTRY_WRC_BIT
  21 /* Sys coherent bit - this bit is never used by Linux */
  22 #define _PAGE_SYS_COHERENT      MMCU_ENTRY_SYS_BIT
  23 #define _PAGE_ALWAYS_ZERO_1     0x020
  24 #define _PAGE_CACHE_CTRL0       0x040
  25 #define _PAGE_CACHE_CTRL1       0x080
  26 #define _PAGE_ALWAYS_ZERO_2     0x100
  27 #define _PAGE_ALWAYS_ZERO_3     0x200
  28 #define _PAGE_ALWAYS_ZERO_4     0x400
  29 #define _PAGE_ALWAYS_ZERO_5     0x800
  30
  31 /* These are software bits that we stuff into the gaps in the hardware
  32  * pte entries that are not used.  Note, these DO get stored in the actual
  33  * hardware, but the hardware just does not use them.
  34  */
  35 #define _PAGE_ACCESSED          _PAGE_ALWAYS_ZERO_1
  36 #define _PAGE_DIRTY             _PAGE_ALWAYS_ZERO_2
  37
  38 /* Pages owned, and protected by, the kernel. */
  39 #define _PAGE_KERNEL            _PAGE_PRIV
  40
  41 /* No cacheing of this page */
  42 #define _PAGE_CACHE_WIN0        (MMCU_CWIN_UNCACHED << MMCU_ENTRY_CWIN_S)
  43 /* burst cacheing - good for data streaming */
  44 #define _PAGE_CACHE_WIN1        (MMCU_CWIN_BURST << MMCU_ENTRY_CWIN_S)
  45 /* One cache way per thread */
  46 #define _PAGE_CACHE_WIN2        (MMCU_CWIN_C1SET << MMCU_ENTRY_CWIN_S)
  47 /* Full on cacheing */
  48 #define _PAGE_CACHE_WIN3        (MMCU_CWIN_CACHED << MMCU_ENTRY_CWIN_S)
  49
  50 #define _PAGE_CACHEABLE         (_PAGE_CACHE_WIN3 | _PAGE_WR_COMBINE)
  51
  52 /* which bits are used for cache control ... */
  53 #define _PAGE_CACHE_MASK        (_PAGE_CACHE_CTRL0 | _PAGE_CACHE_CTRL1 | \
  54                                  _PAGE_WR_COMBINE)
  55
  56 /* This is a mask of the bits that pte_modify is allowed to change. */
  57 #define _PAGE_CHG_MASK          (PAGE_MASK)
  58
  59 #define _PAGE_SZ_SHIFT          1
  60 #define _PAGE_SZ_4K             (0x0)
  61 #define _PAGE_SZ_8K             (0x1 << _PAGE_SZ_SHIFT)
  62 #define _PAGE_SZ_16K            (0x2 << _PAGE_SZ_SHIFT)
  63 #define _PAGE_SZ_32K            (0x3 << _PAGE_SZ_SHIFT)
  64 #define _PAGE_SZ_64K            (0x4 << _PAGE_SZ_SHIFT)
  65 #define _PAGE_SZ_128K           (0x5 << _PAGE_SZ_SHIFT)
  66 #define _PAGE_SZ_256K           (0x6 << _PAGE_SZ_SHIFT)
  67 #define _PAGE_SZ_512K           (0x7 << _PAGE_SZ_SHIFT)
  68 #define _PAGE_SZ_1M             (0x8 << _PAGE_SZ_SHIFT)
  69 #define _PAGE_SZ_2M             (0x9 << _PAGE_SZ_SHIFT)
  70 #define _PAGE_SZ_4M             (0xa << _PAGE_SZ_SHIFT)
  71 #define _PAGE_SZ_MASK           (0xf << _PAGE_SZ_SHIFT)
  72
  73 #if defined(CONFIG_PAGE_SIZE_4K)
  74 #define _PAGE_SZ                (_PAGE_SZ_4K)
  75 #elif defined(CONFIG_PAGE_SIZE_8K)
  76 #define _PAGE_SZ                (_PAGE_SZ_8K)
  77 #elif defined(CONFIG_PAGE_SIZE_16K)
  78 #define _PAGE_SZ                (_PAGE_SZ_16K)
  79 #endif
  80 #define _PAGE_TABLE             (_PAGE_SZ | _PAGE_PRESENT)
  81
  82 #if defined(CONFIG_HUGETLB_PAGE_SIZE_8K)
  83 # define _PAGE_SZHUGE           (_PAGE_SZ_8K)
  84 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K)
  85 # define _PAGE_SZHUGE           (_PAGE_SZ_16K)
  86 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K)
  87 # define _PAGE_SZHUGE           (_PAGE_SZ_32K)
  88 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  89 # define _PAGE_SZHUGE           (_PAGE_SZ_64K)
  90 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K)
  91 # define _PAGE_SZHUGE           (_PAGE_SZ_128K)
  92 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  93 # define _PAGE_SZHUGE           (_PAGE_SZ_256K)
  94 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  95 # define _PAGE_SZHUGE           (_PAGE_SZ_512K)
  96 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M)
  97 # define _PAGE_SZHUGE           (_PAGE_SZ_1M)
  98 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M)
  99 # define _PAGE_SZHUGE           (_PAGE_SZ_2M)
 100 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M)
 101 # define _PAGE_SZHUGE           (_PAGE_SZ_4M)
 102 #endif
 103
 104 #endif /* _METAG_PGTABLE_BITS_H */