[PATCH -V1 3/9] arch/powerpc: Simplify hpte_decode
From: Aneesh Kumar K.V <hidden>
Date: 2012-06-29 14:18:04
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
From: "Aneesh Kumar K.V" <redacted> This patch simplify hpte_decode for easy switching of virtual address to vsid and segment offset combination in the later patch Signed-off-by: Aneesh Kumar K.V <redacted> --- arch/powerpc/mm/hash_native_64.c | 51 ++++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 21 deletions(-)
diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index cab3892..76c2574 100644
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c@@ -357,9 +357,10 @@ static void native_hpte_invalidate(unsigned long slot, struct virt_addr va, static void hpte_decode(struct hash_pte *hpte, unsigned long slot, int *psize, int *ssize, struct virt_addr *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))
@@ -386,32 +387,40 @@ 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->addr = vsid << 28 | 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->addr = vsid << 40 | seg_off; + default: + seg_off = 0; + vsid = 0; + va->addr = 0; } - - va->addr = avpn; *psize = size; - *ssize = hpte_v >> HPTE_V_SSIZE_SHIFT; } /*
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1.7.10