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 #define mmu_virtual_psize MMU_PAGE_4K 65 #define mmu_linear_psize MMU_PAGE_256M 66 67 #endif /* _ASM_POWERPC_MMU_40X_H_ */ 68