diff options
Diffstat (limited to 'arch/powerpc/mm/slb.c')
| -rw-r--r-- | arch/powerpc/mm/slb.c | 36 |
1 files changed, 28 insertions, 8 deletions
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c index a73d2d700973..ff1811ac6c81 100644 --- a/arch/powerpc/mm/slb.c +++ b/arch/powerpc/mm/slb.c @@ -74,6 +74,22 @@ static inline void slb_shadow_clear(unsigned long entry) get_slb_shadow()->save_area[entry].esid = 0; } +static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags, + unsigned long entry) +{ + /* + * Updating the shadow buffer before writing the SLB ensures + * we don't get a stale entry here if we get preempted by PHYP + * between these two statements. + */ + slb_shadow_update(ea, flags, entry); + + asm volatile("slbmte %0,%1" : + : "r" (mk_vsid_data(ea, flags)), + "r" (mk_esid_data(ea, entry)) + : "memory" ); +} + void slb_flush_and_rebolt(void) { /* If you change this make sure you change SLB_NUM_BOLTED @@ -226,12 +242,16 @@ void slb_initialize(void) vflags = SLB_VSID_KERNEL | vmalloc_llp; /* Invalidate the entire SLB (even slot 0) & all the ERATS */ - slb_shadow_update(PAGE_OFFSET, lflags, 0); - asm volatile("isync; slbia; sync; slbmte %0,%1; isync" :: - "r" (get_slb_shadow()->save_area[0].vsid), - "r" (get_slb_shadow()->save_area[0].esid) : "memory"); - - slb_shadow_update(VMALLOC_START, vflags, 1); - - slb_flush_and_rebolt(); + asm volatile("isync":::"memory"); + asm volatile("slbmte %0,%0"::"r" (0) : "memory"); + asm volatile("isync; slbia; isync":::"memory"); + create_shadowed_slbe(PAGE_OFFSET, lflags, 0); + + create_shadowed_slbe(VMALLOC_START, vflags, 1); + + /* We don't bolt the stack for the time being - we're in boot, + * so the stack is in the bolted segment. By the time it goes + * elsewhere, we'll call _switch() which will bolt in the new + * one. */ + asm volatile("isync":::"memory"); } |