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powerpc: Add TLB size detection for TYPE_3E MMUs 

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2011-04-14 22:32:02 +00:00
parent 76b4eda866
commit bd49178109
2 changed files with 26 additions and 1 deletions
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15
arch/powerpc/include/asm/mmu-book3e.h
View File

@ -137,6 +137,21 @@
#define MMUCSR0_TLB2PS 0x00078000 /* TLB2 Page Size */ #define MMUCSR0_TLB2PS 0x00078000 /* TLB2 Page Size */
#define MMUCSR0_TLB3PS 0x00780000 /* TLB3 Page Size */ #define MMUCSR0_TLB3PS 0x00780000 /* TLB3 Page Size */
/* MMUCFG bits */
#define MMUCFG_MAVN_NASK 0x00000003
#define MMUCFG_MAVN_V1_0 0x00000000
#define MMUCFG_MAVN_V2_0 0x00000001
#define MMUCFG_NTLB_MASK 0x0000000c
#define MMUCFG_NTLB_SHIFT 2
#define MMUCFG_PIDSIZE_MASK 0x000007c0
#define MMUCFG_PIDSIZE_SHIFT 6
#define MMUCFG_TWC 0x00008000
#define MMUCFG_LRAT 0x00010000
#define MMUCFG_RASIZE_MASK 0x00fe0000
#define MMUCFG_RASIZE_SHIFT 17
#define MMUCFG_LPIDSIZE_MASK 0x0f000000
#define MMUCFG_LPIDSIZE_SHIFT 24
/* TLBnCFG encoding */ /* TLBnCFG encoding */
#define TLBnCFG_N_ENTRY 0x00000fff /* number of entries */ #define TLBnCFG_N_ENTRY 0x00000fff /* number of entries */
#define TLBnCFG_HES 0x00002000 /* HW select supported */ #define TLBnCFG_HES 0x00002000 /* HW select supported */

12
arch/powerpc/mm/mmu_context_nohash.c
View File

@ -409,7 +409,17 @@ void __init mmu_context_init(void)
} else if (mmu_has_feature(MMU_FTR_TYPE_47x)) { } else if (mmu_has_feature(MMU_FTR_TYPE_47x)) {
first_context = 1; first_context = 1;
last_context = 65535; last_context = 65535;
} else { } else
#ifdef CONFIG_PPC_BOOK3E_MMU
if (mmu_has_feature(MMU_FTR_TYPE_3E)) {
u32 mmucfg = mfspr(SPRN_MMUCFG);
u32 pid_bits = (mmucfg & MMUCFG_PIDSIZE_MASK)
>> MMUCFG_PIDSIZE_SHIFT;
first_context = 1;
last_context = (1UL << (pid_bits + 1)) - 1;
} else
#endif
{
first_context = 1; first_context = 1;
last_context = 255; last_context = 255;
} }