diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2013-03-12 00:31:31 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-03-22 15:28:50 +0100 |
| commit | 181488987671841407c52b6f958650f68b66f3f4 (patch) | |
| tree | 0622e96faab889bcfbde5c29242c30da0ec19421 /target-ppc/mmu-hash64.c | |
| parent | 7f3bdc2d8e17999a26ac0f6649caef92fedfc1c0 (diff) | |
mmu-hash64: Clean up ppc_hash64_htab_lookup()
This patch makes a general cleanup of the address mangling logic in
ppc_hash64_htab_lookup(). In particular it now avoids repeatedly switching
on the segment size. The lack of SLB and multiple segment sizes on 32-bit
means an analogous cleanup is not needed there.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/mmu-hash64.c')
| -rw-r--r-- | target-ppc/mmu-hash64.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c index a98e008a9b..10372f0ed8 100644 --- a/target-ppc/mmu-hash64.c +++ b/target-ppc/mmu-hash64.c @@ -379,31 +379,29 @@ static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env, ppc_hash_pte64_t *pte) { hwaddr pteg_off, pte_offset; - uint64_t vsid, pageaddr, ptem; hwaddr hash; - int segment_bits, target_page_bits; + uint64_t vsid, epnshift, epnmask, epn, ptem; - if (slb->vsid & SLB_VSID_B) { - vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T; - segment_bits = 40; - } else { - vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT; - segment_bits = 28; - } - - target_page_bits = (slb->vsid & SLB_VSID_L) + /* Page size according to the SLB, which we use to generate the + * EPN for hash table lookup.. When we implement more recent MMU + * extensions this might be different from the actual page size + * encoded in the PTE */ + epnshift = (slb->vsid & SLB_VSID_L) ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS; + epnmask = ~((1ULL << epnshift) - 1); - pageaddr = eaddr & ((1ULL << segment_bits) - - (1ULL << target_page_bits)); if (slb->vsid & SLB_VSID_B) { - hash = vsid ^ (vsid << 25) ^ (pageaddr >> target_page_bits); + /* 1TB segment */ + vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T; + epn = (eaddr & ~SEGMENT_MASK_1T) & epnmask; + hash = vsid ^ (vsid << 25) ^ (epn >> epnshift); } else { - hash = vsid ^ (pageaddr >> target_page_bits); + /* 256M segment */ + vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT; + epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask; + hash = vsid ^ (epn >> epnshift); } - /* Only 5 bits of the page index are used in the AVPN */ - ptem = (slb->vsid & SLB_VSID_PTEM) | - ((pageaddr >> 16) & ((1ULL << segment_bits) - 0x80)); + ptem = (slb->vsid & SLB_VSID_PTEM) | ((epn >> 16) & HPTE64_V_AVPN); /* Page address translation */ LOG_MMU("htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx |