diff options
| author | Aneesh Kumar K.V | 2012-09-10 02:52:49 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt | 2012-09-17 16:31:49 +1000 |
| commit | dcda287a9b26309ae43a091d0ecde16f8f61b4c0 (patch) | |
| tree | 7372499b3030326f50d34772a45fad1d76fef30c /arch/powerpc/mm | |
| parent | f6412b742ac754b4bbf3acaa9c05f825505671a1 (diff) | |
powerpc/mm: Simplify hpte_decode
This patch simplify hpte_decode for easy switching of virtual address to
virtual page number in the later patch
Reviewed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/hash_native_64.c | 49 |
1 files changed, 28 insertions, 21 deletions
diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c index f21e8ce8db33..ebf685af4af2 100644 --- a/arch/powerpc/mm/hash_native_64.c +++ b/arch/powerpc/mm/hash_native_64.c @@ -351,9 +351,10 @@ static void native_hpte_invalidate(unsigned long slot, unsigned long va, static void hpte_decode(struct hash_pte *hpte, unsigned long slot, int *psize, int *ssize, unsigned long *va) { + unsigned long avpn, pteg, vpi; unsigned long hpte_r = hpte->r; unsigned long hpte_v = hpte->v; - unsigned long avpn; + unsigned long vsid, seg_off; int i, size, shift, penc; if (!(hpte_v & HPTE_V_LARGE)) @@ -380,32 +381,38 @@ static void hpte_decode(struct hash_pte *hpte, unsigned long slot, } /* This works for all page sizes, and for 256M and 1T segments */ + *ssize = hpte_v >> HPTE_V_SSIZE_SHIFT; shift = mmu_psize_defs[size].shift; - avpn = (HPTE_V_AVPN_VAL(hpte_v) & ~mmu_psize_defs[size].avpnm) << 23; - - if (shift < 23) { - unsigned long vpi, vsid, pteg; - pteg = slot / HPTES_PER_GROUP; - if (hpte_v & HPTE_V_SECONDARY) - pteg = ~pteg; - switch (hpte_v >> HPTE_V_SSIZE_SHIFT) { - case MMU_SEGSIZE_256M: - vpi = ((avpn >> 28) ^ pteg) & htab_hash_mask; - break; - case MMU_SEGSIZE_1T: - vsid = avpn >> 40; + avpn = (HPTE_V_AVPN_VAL(hpte_v) & ~mmu_psize_defs[size].avpnm); + pteg = slot / HPTES_PER_GROUP; + if (hpte_v & HPTE_V_SECONDARY) + pteg = ~pteg; + + switch (*ssize) { + case MMU_SEGSIZE_256M: + /* We only have 28 - 23 bits of seg_off in avpn */ + seg_off = (avpn & 0x1f) << 23; + vsid = avpn >> 5; + /* We can find more bits from the pteg value */ + if (shift < 23) { + vpi = (vsid ^ pteg) & htab_hash_mask; + seg_off |= vpi << shift; + } + *va = vsid << SID_SHIFT | seg_off; + case MMU_SEGSIZE_1T: + /* We only have 40 - 23 bits of seg_off in avpn */ + seg_off = (avpn & 0x1ffff) << 23; + vsid = avpn >> 17; + if (shift < 23) { vpi = (vsid ^ (vsid << 25) ^ pteg) & htab_hash_mask; - break; - default: - avpn = vpi = size = 0; + seg_off |= vpi << shift; } - avpn |= (vpi << mmu_psize_defs[size].shift); + *va = vsid << SID_SHIFT_1T | seg_off; + default: + *va = size = 0; } - - *va = avpn; *psize = size; - *ssize = hpte_v >> HPTE_V_SSIZE_SHIFT; } /* |