arch/powerpc/include/asm/mmu-40x.h

   1 #ifndef _ASM_POWERPC_MMU_40X_H_
   2 #define _ASM_POWERPC_MMU_40X_H_
   3
   4 /*
   5  * PPC40x support
   6  */
   7
   8 #define PPC40X_TLB_SIZE 64
   9
  10 /*
  11  * TLB entries are defined by a "high" tag portion and a "low" data
  12  * portion.  On all architectures, the data portion is 32-bits.
  13  *
  14  * TLB entries are managed entirely under software control by reading,
  15  * writing, and searchoing using the 4xx-specific tlbre, tlbwr, and tlbsx
  16  * instructions.
  17  */
  18
  19 #define TLB_LO          1
  20 #define TLB_HI          0
  21
  22 #define TLB_DATA        TLB_LO
  23 #define TLB_TAG         TLB_HI
  24
  25 /* Tag portion */
  26
  27 #define TLB_EPN_MASK    0xFFFFFC00      /* Effective Page Number */
  28 #define TLB_PAGESZ_MASK 0x00000380
  29 #define TLB_PAGESZ(x)   (((x) & 0x7) << 7)
  30 #define   PAGESZ_1K             0
  31 #define   PAGESZ_4K             1
  32 #define   PAGESZ_16K            2
  33 #define   PAGESZ_64K            3
  34 #define   PAGESZ_256K           4
  35 #define   PAGESZ_1M             5
  36 #define   PAGESZ_4M             6
  37 #define   PAGESZ_16M            7
  38 #define TLB_VALID       0x00000040      /* Entry is valid */
  39
  40 /* Data portion */
  41
  42 #define TLB_RPN_MASK    0xFFFFFC00      /* Real Page Number */
  43 #define TLB_PERM_MASK   0x00000300
  44 #define TLB_EX          0x00000200      /* Instruction execution allowed */
  45 #define TLB_WR          0x00000100      /* Writes permitted */
  46 #define TLB_ZSEL_MASK   0x000000F0
  47 #define TLB_ZSEL(x)     (((x) & 0xF) << 4)
  48 #define TLB_ATTR_MASK   0x0000000F
  49 #define TLB_W           0x00000008      /* Caching is write-through */
  50 #define TLB_I           0x00000004      /* Caching is inhibited */
  51 #define TLB_M           0x00000002      /* Memory is coherent */
  52 #define TLB_G           0x00000001      /* Memory is guarded from prefetch */
  53
  54 #ifndef __ASSEMBLY__
  55
  56 typedef struct {
  57         unsigned int    id;
  58         unsigned int    active;
  59         unsigned long   vdso_base;
  60 } mm_context_t;
  61
  62 #endif /* !__ASSEMBLY__ */
  63
  64 #endif /* _ASM_POWERPC_MMU_40X_H_ */