arch/powerpc/include/asm/mmu-44x.h

   1 #ifndef _ASM_POWERPC_MMU_44X_H_
   2 #define _ASM_POWERPC_MMU_44X_H_
   3 /*
   4  * PPC440 support
   5  */
   6
   7 #include <asm/page.h>
   8
   9 #define PPC44x_MMUCR_TID        0x000000ff
  10 #define PPC44x_MMUCR_STS        0x00010000
  11
  12 #define PPC44x_TLB_PAGEID       0
  13 #define PPC44x_TLB_XLAT         1
  14 #define PPC44x_TLB_ATTRIB       2
  15
  16 /* Page identification fields */
  17 #define PPC44x_TLB_EPN_MASK     0xfffffc00      /* Effective Page Number */
  18 #define PPC44x_TLB_VALID        0x00000200      /* Valid flag */
  19 #define PPC44x_TLB_TS           0x00000100      /* Translation address space */
  20 #define PPC44x_TLB_1K           0x00000000      /* Page sizes */
  21 #define PPC44x_TLB_4K           0x00000010
  22 #define PPC44x_TLB_16K          0x00000020
  23 #define PPC44x_TLB_64K          0x00000030
  24 #define PPC44x_TLB_256K         0x00000040
  25 #define PPC44x_TLB_1M           0x00000050
  26 #define PPC44x_TLB_16M          0x00000070
  27 #define PPC44x_TLB_256M         0x00000090
  28
  29 /* Translation fields */
  30 #define PPC44x_TLB_RPN_MASK     0xfffffc00      /* Real Page Number */
  31 #define PPC44x_TLB_ERPN_MASK    0x0000000f
  32
  33 /* Storage attribute and access control fields */
  34 #define PPC44x_TLB_ATTR_MASK    0x0000ff80
  35 #define PPC44x_TLB_U0           0x00008000      /* User 0 */
  36 #define PPC44x_TLB_U1           0x00004000      /* User 1 */
  37 #define PPC44x_TLB_U2           0x00002000      /* User 2 */
  38 #define PPC44x_TLB_U3           0x00001000      /* User 3 */
  39 #define PPC44x_TLB_W            0x00000800      /* Caching is write-through */
  40 #define PPC44x_TLB_I            0x00000400      /* Caching is inhibited */
  41 #define PPC44x_TLB_M            0x00000200      /* Memory is coherent */
  42 #define PPC44x_TLB_G            0x00000100      /* Memory is guarded */
  43 #define PPC44x_TLB_E            0x00000080      /* Memory is guarded */
  44
  45 #define PPC44x_TLB_PERM_MASK    0x0000003f
  46 #define PPC44x_TLB_UX           0x00000020      /* User execution */
  47 #define PPC44x_TLB_UW           0x00000010      /* User write */
  48 #define PPC44x_TLB_UR           0x00000008      /* User read */
  49 #define PPC44x_TLB_SX           0x00000004      /* Super execution */
  50 #define PPC44x_TLB_SW           0x00000002      /* Super write */
  51 #define PPC44x_TLB_SR           0x00000001      /* Super read */
  52
  53 /* Number of TLB entries */
  54 #define PPC44x_TLB_SIZE         64
  55
  56 #ifndef __ASSEMBLY__
  57
  58 extern unsigned int tlb_44x_hwater;
  59 extern unsigned int tlb_44x_index;
  60
  61 typedef struct {
  62         unsigned int    id;
  63         unsigned int    active;
  64         unsigned long   vdso_base;
  65 } mm_context_t;
  66
  67 #endif /* !__ASSEMBLY__ */
  68
  69 #ifndef CONFIG_PPC_EARLY_DEBUG_44x
  70 #define PPC44x_EARLY_TLBS       1
  71 #else
  72 #define PPC44x_EARLY_TLBS       2
  73 #define PPC44x_EARLY_DEBUG_VIRTADDR     (ASM_CONST(0xf0000000) \
  74         | (ASM_CONST(CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW) & 0xffff))
  75 #endif
  76
  77 /* Size of the TLBs used for pinning in lowmem */
  78 #define PPC_PIN_SIZE    (1 << 28)       /* 256M */
  79
  80 #if (PAGE_SHIFT == 12)
  81 #define PPC44x_TLBE_SIZE        PPC44x_TLB_4K
  82 #define mmu_virtual_psize       MMU_PAGE_4K
  83 #elif (PAGE_SHIFT == 14)
  84 #define PPC44x_TLBE_SIZE        PPC44x_TLB_16K
  85 #define mmu_virtual_psize       MMU_PAGE_16K
  86 #elif (PAGE_SHIFT == 16)
  87 #define PPC44x_TLBE_SIZE        PPC44x_TLB_64K
  88 #define mmu_virtual_psize       MMU_PAGE_64K
  89 #elif (PAGE_SHIFT == 18)
  90 #define PPC44x_TLBE_SIZE        PPC44x_TLB_256K
  91 #define mmu_virtual_psize       MMU_PAGE_256K
  92 #else
  93 #error "Unsupported PAGE_SIZE"
  94 #endif
  95
  96 #define mmu_linear_psize        MMU_PAGE_256M
  97
  98 #define PPC44x_PGD_OFF_SHIFT    (32 - PGDIR_SHIFT + PGD_T_LOG2)
  99 #define PPC44x_PGD_OFF_MASK_BIT (PGDIR_SHIFT - PGD_T_LOG2)
 100 #define PPC44x_PTE_ADD_SHIFT    (32 - PGDIR_SHIFT + PTE_SHIFT + PTE_T_LOG2)
 101 #define PPC44x_PTE_ADD_MASK_BIT (32 - PTE_T_LOG2 - PTE_SHIFT)
 102
 103 #endif /* _ASM_POWERPC_MMU_44X_H_ */