From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp02.au.ibm.com (e23smtp02.au.ibm.com [202.81.31.144]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp02.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id A26392C0201 for ; Thu, 5 Jul 2012 18:15:00 +1000 (EST) Received: from /spool/local by e23smtp02.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 5 Jul 2012 07:54:46 +1000 Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q6586nSu58064916 for ; Thu, 5 Jul 2012 18:06:49 +1000 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q658EXJH026143 for ; Thu, 5 Jul 2012 18:14:33 +1000 From: "Aneesh Kumar K.V" To: benh@kernel.crashing.org, paulus@samba.org Subject: [PATCH 2/9] arch/powerpc: Simplify hpte_decode Date: Thu, 5 Jul 2012 13:44:11 +0530 Message-Id: <1341476058-5405-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1341476058-5405-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1341476058-5405-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Aneesh Kumar K.V" This patch simplify hpte_decode for easy switching of virtual address to virtual page number in the later patch Signed-off-by: Aneesh Kumar K.V --- arch/powerpc/mm/hash_native_64.c | 49 ++++++++++++++++++++++---------------- 1 file changed, 28 insertions(+), 21 deletions(-) diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c index 90039bc..660b8bb 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; } /* -- 1.7.10