release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/include/asm/mmu-hash32.h

   1 #ifndef _ASM_POWERPC_MMU_HASH32_H_
   2 #define _ASM_POWERPC_MMU_HASH32_H_
   3 /*
   4  * 32-bit hash table MMU support
   5  */
   6
   7 /*
   8  * BATs
   9  */
  10
  11 /* Block size masks */
  12 #define BL_128K 0x000
  13 #define BL_256K 0x001
  14 #define BL_512K 0x003
  15 #define BL_1M   0x007
  16 #define BL_2M   0x00F
  17 #define BL_4M   0x01F
  18 #define BL_8M   0x03F
  19 #define BL_16M  0x07F
  20 #define BL_32M  0x0FF
  21 #define BL_64M  0x1FF
  22 #define BL_128M 0x3FF
  23 #define BL_256M 0x7FF
  24
  25 /* BAT Access Protection */
  26 #define BPP_XX  0x00            /* No access */
  27 #define BPP_RX  0x01            /* Read only */
  28 #define BPP_RW  0x02            /* Read/write */
  29
  30 #ifndef __ASSEMBLY__
  31 /* Contort a phys_addr_t into the right format/bits for a BAT */
  32 #ifdef CONFIG_PHYS_64BIT
  33 #define BAT_PHYS_ADDR(x) ((u32)((x & 0x00000000fffe0000ULL) | \
  34                                 ((x & 0x0000000e00000000ULL) >> 24) | \
  35                                 ((x & 0x0000000100000000ULL) >> 30)))
  36 #else
  37 #define BAT_PHYS_ADDR(x) (x)
  38 #endif
  39
  40 struct ppc_bat {
  41         u32 batu;
  42         u32 batl;
  43 };
  44 #endif /* !__ASSEMBLY__ */
  45
  46 /*
  47  * Hash table
  48  */
  49
  50 /* Values for PP (assumes Ks=0, Kp=1) */
  51 #define PP_RWXX 0       /* Supervisor read/write, User none */
  52 #define PP_RWRX 1       /* Supervisor read/write, User read */
  53 #define PP_RWRW 2       /* Supervisor read/write, User read/write */
  54 #define PP_RXRX 3       /* Supervisor read,       User read */
  55
  56 #ifndef __ASSEMBLY__
  57
  58 /*
  59  * Hardware Page Table Entry
  60  * Note that the xpn and x bitfields are used only by processors that
  61  * support extended addressing; otherwise, those bits are reserved.
  62  */
  63 struct hash_pte {
  64         unsigned long v:1;      /* Entry is valid */
  65         unsigned long vsid:24;  /* Virtual segment identifier */
  66         unsigned long h:1;      /* Hash algorithm indicator */
  67         unsigned long api:6;    /* Abbreviated page index */
  68         unsigned long rpn:20;   /* Real (physical) page number */
  69         unsigned long xpn:3;    /* Real page number bits 0-2, optional */
  70         unsigned long r:1;      /* Referenced */
  71         unsigned long c:1;      /* Changed */
  72         unsigned long w:1;      /* Write-thru cache mode */
  73         unsigned long i:1;      /* Cache inhibited */
  74         unsigned long m:1;      /* Memory coherence */
  75         unsigned long g:1;      /* Guarded */
  76         unsigned long x:1;      /* Real page number bit 3, optional */
  77         unsigned long pp:2;     /* Page protection */
  78 };
  79
  80 typedef struct {
  81         unsigned long id;
  82         unsigned long vdso_base;
  83 } mm_context_t;
  84
  85 #endif /* !__ASSEMBLY__ */
  86
  87 /* We happily ignore the smaller BATs on 601, we don't actually use
  88  * those definitions on hash32 at the moment anyway
  89  */
  90 #define mmu_virtual_psize       MMU_PAGE_4K
  91 #define mmu_linear_psize        MMU_PAGE_256M
  92
  93 #endif /* _ASM_POWERPC_MMU_HASH32_H_ */