diff options
Diffstat (limited to 'kernel/arch/powerpc/include/asm/mmu-hash32.h')
| -rw-r--r-- | kernel/arch/powerpc/include/asm/mmu-hash32.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/include/asm/mmu-hash32.h b/kernel/arch/powerpc/include/asm/mmu-hash32.h new file mode 100644 index 000000000..16f513e5c --- /dev/null +++ b/kernel/arch/powerpc/include/asm/mmu-hash32.h @@ -0,0 +1,93 @@ +#ifndef _ASM_POWERPC_MMU_HASH32_H_ +#define _ASM_POWERPC_MMU_HASH32_H_ +/* + * 32-bit hash table MMU support + */ + +/* + * BATs + */ + +/* Block size masks */ +#define BL_128K 0x000 +#define BL_256K 0x001 +#define BL_512K 0x003 +#define BL_1M 0x007 +#define BL_2M 0x00F +#define BL_4M 0x01F +#define BL_8M 0x03F +#define BL_16M 0x07F +#define BL_32M 0x0FF +#define BL_64M 0x1FF +#define BL_128M 0x3FF +#define BL_256M 0x7FF + +/* BAT Access Protection */ +#define BPP_XX 0x00 /* No access */ +#define BPP_RX 0x01 /* Read only */ +#define BPP_RW 0x02 /* Read/write */ + +#ifndef __ASSEMBLY__ +/* Contort a phys_addr_t into the right format/bits for a BAT */ +#ifdef CONFIG_PHYS_64BIT +#define BAT_PHYS_ADDR(x) ((u32)((x & 0x00000000fffe0000ULL) | \ + ((x & 0x0000000e00000000ULL) >> 24) | \ + ((x & 0x0000000100000000ULL) >> 30))) +#else +#define BAT_PHYS_ADDR(x) (x) +#endif + +struct ppc_bat { + u32 batu; + u32 batl; +}; +#endif /* !__ASSEMBLY__ */ + +/* + * Hash table + */ + +/* Values for PP (assumes Ks=0, Kp=1) */ +#define PP_RWXX 0 /* Supervisor read/write, User none */ +#define PP_RWRX 1 /* Supervisor read/write, User read */ +#define PP_RWRW 2 /* Supervisor read/write, User read/write */ +#define PP_RXRX 3 /* Supervisor read, User read */ + +#ifndef __ASSEMBLY__ + +/* + * Hardware Page Table Entry + * Note that the xpn and x bitfields are used only by processors that + * support extended addressing; otherwise, those bits are reserved. + */ +struct hash_pte { + unsigned long v:1; /* Entry is valid */ + unsigned long vsid:24; /* Virtual segment identifier */ + unsigned long h:1; /* Hash algorithm indicator */ + unsigned long api:6; /* Abbreviated page index */ + unsigned long rpn:20; /* Real (physical) page number */ + unsigned long xpn:3; /* Real page number bits 0-2, optional */ + unsigned long r:1; /* Referenced */ + unsigned long c:1; /* Changed */ + unsigned long w:1; /* Write-thru cache mode */ + unsigned long i:1; /* Cache inhibited */ + unsigned long m:1; /* Memory coherence */ + unsigned long g:1; /* Guarded */ + unsigned long x:1; /* Real page number bit 3, optional */ + unsigned long pp:2; /* Page protection */ +}; + +typedef struct { + unsigned long id; + unsigned long vdso_base; +} mm_context_t; + +#endif /* !__ASSEMBLY__ */ + +/* We happily ignore the smaller BATs on 601, we don't actually use + * those definitions on hash32 at the moment anyway + */ +#define mmu_virtual_psize MMU_PAGE_4K +#define mmu_linear_psize MMU_PAGE_256M + +#endif /* _ASM_POWERPC_MMU_HASH32_H_ */ |