From: Scott Wood scottwood@freescale.com
Its reset value is random, and we sometimes read uninitialized TLB arrays. Make sure that we don't retain MAS8 from reading such an entry if the VF bit in MAS8 is set, attempts to use the mapping will trap.
Signed-off-by: Scott Wood scottwood@freescale.com --- cpu/mpc85xx/start.S | 4 ++++ cpu/mpc85xx/tlb.c | 3 +++ include/asm-ppc/processor.h | 2 ++ 3 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S index eaed0e0..7a23b4f 100644 --- a/cpu/mpc85xx/start.S +++ b/cpu/mpc85xx/start.S @@ -156,6 +156,10 @@ _start_e500: mtspr MCSR,r0 /* machine check syndrome register */ mtxer r0 /* clear integer exception register */
+#ifdef CONFIG_SYS_BOOK3E_HV + mtspr MAS8,r0 /* make sure MAS8 is clear */ +#endif + /* Enable Time Base and Select Time Base Clock */ lis r0,HID0_EMCP@h /* Enable machine check */ #if defined(CONFIG_ENABLE_36BIT_PHYS) diff --git a/cpu/mpc85xx/tlb.c b/cpu/mpc85xx/tlb.c index 0497a29..03c2449 100644 --- a/cpu/mpc85xx/tlb.c +++ b/cpu/mpc85xx/tlb.c @@ -51,6 +51,9 @@ void set_tlb(u8 tlb, u32 epn, u64 rpn, #ifdef CONFIG_ENABLE_36BIT_PHYS mtspr(MAS7, _mas7); #endif +#ifdef CONFIG_SYS_BOOK3E_HV + mtspr(MAS8, 0); +#endif asm volatile("isync;msync;tlbwe;isync");
#ifdef CONFIG_ADDR_MAP diff --git a/include/asm-ppc/processor.h b/include/asm-ppc/processor.h index 0a4c66c..3764a5a 100644 --- a/include/asm-ppc/processor.h +++ b/include/asm-ppc/processor.h @@ -518,6 +518,7 @@ #define SPRN_MAS5 0x275 /* MMU Assist Register 5 */ #define SPRN_MAS6 0x276 /* MMU Assist Register 6 */ #define SPRN_MAS7 0x3B0 /* MMU Assist Register 7 */ +#define SPRN_MAS8 0x155 /* MMU Assist Register 8 */
#define SPRN_IVOR32 0x210 /* Interrupt Vector Offset Register 32 */ #define SPRN_IVOR33 0x211 /* Interrupt Vector Offset Register 33 */ @@ -720,6 +721,7 @@ #define MAS5 SPRN_MAS5 #define MAS6 SPRN_MAS6 #define MAS7 SPRN_MAS7 +#define MAS8 SPRN_MAS8
#if defined(CONFIG_4xx) || defined(CONFIG_44x) || defined(CONFIG_MPC85xx) #define DAR_DEAR DEAR