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powerpc/476: Add isync after loading mmu and debug spr's 

476 requires an isync after loading MMU and debug related SPR's.  Some of
these are in performance-critical paths and may need to be optimized, but
initially, we're playing it safe.

Signed-off-by: Torez Smith  <lnxtorez@linux.vnet.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Dave Kleikamp 2010-03-05 10:43:24 +00:00 committed by Josh Boyer
parent fc5e709731
commit 221c185d4e
2 changed files with 6 additions and 0 deletions
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3
arch/powerpc/kernel/kprobes.c
View File

@ -114,6 +114,9 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
regs->msr &= ~MSR_CE;
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
#ifdef CONFIG_PPC_47x
isync();
#endif
#endif
/*

3
arch/powerpc/kernel/process.c
View File

@ -371,6 +371,9 @@ int set_dabr(unsigned long dabr)
/* XXX should we have a CPU_FTR_HAS_DABR ? */
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
mtspr(SPRN_DAC1, dabr);
#ifdef CONFIG_PPC_47x
isync();
#endif
#elif defined(CONFIG_PPC_BOOK3S)
mtspr(SPRN_DABR, dabr);
#endif