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PPC: booke206: move avail check to tlbwe 

We can have TLBs that only support a single page size. This is defined
by the absence of the AVAIL flag in TLBnCFG. If this is the case, we
currently write invalid size info into the TLB, but override it on
internal fault.

Let's move the check over to tlbwe, so we don't have the AVAIL check in
the hotter fault path.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-01-25 17:06:30 +01:00
parent 3f162d119e
commit 21a0b6ed1d
2 changed files with 10 additions and 7 deletions
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8
target-ppc/helper.c
View File

@ -1298,13 +1298,7 @@ target_phys_addr_t booke206_tlb_to_page_size(CPUState *env, ppcmas_tlb_t *tlb)
int tlbm_size;
tlbncfg = env->spr[SPR_BOOKE_TLB0CFG + tlbn];
if (tlbncfg & TLBnCFG_AVAIL) {
tlbm_size = (tlb->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
} else {
tlbm_size = (tlbncfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
tlbm_size <<= 1;
}
tlbm_size = (tlb->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
return 1024ULL << tlbm_size;
}

9
target-ppc/op_helper.c
View File

@ -4282,6 +4282,15 @@ void helper_booke206_tlbwe(void)
tlb->mas7_3 = ((uint64_t)env->spr[SPR_BOOKE_MAS7] << 32) |
env->spr[SPR_BOOKE_MAS3];
tlb->mas1 = env->spr[SPR_BOOKE_MAS1];
/* MAV 1.0 only */
if (!(tlbncfg & TLBnCFG_AVAIL)) {
/* force !AVAIL TLB entries to correct page size */
tlb->mas1 &= ~MAS1_TSIZE_MASK;
/* XXX can be configured in MMUCSR0 */
tlb->mas1 |= (tlbncfg & TLBnCFG_MINSIZE) >> 12;
}
/* XXX needs to change when supporting 64-bit e500 */
tlb->mas2 = env->spr[SPR_BOOKE_MAS2] & 0xffffffff;