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[-V8,08/11] arch/powerpc: Use the required number of VSID bits in slbmte

Message ID 1346945351-7672-9-git-send-email-aneesh.kumar@linux.vnet.ibm.com (mailing list archive)
State Changes Requested
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Aneesh Kumar K.V Sept. 6, 2012, 3:29 p.m. UTC 
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

ASM_VSID_SCRAMBLE can leave non-zero bits in the high 28 bits of the result
for 256MB segment (40 bits for 1T segment). Properly mask them before using
the values in slbmte

Reviewed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/mm/slb_low.S |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index e132dc6..3b75f19 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -223,7 +223,11 @@  _GLOBAL(slb_allocate_user)
  */
 slb_finish_load:
 	ASM_VSID_SCRAMBLE(r10,r9,256M)
-	rldimi	r11,r10,SLB_VSID_SHIFT,16	/* combine VSID and flags */
+	/*
+	 * bits above VSID_BITS_256M need to be ignored from r10
+	 * also combine VSID and flags
+	 */
+	rldimi	r11,r10,SLB_VSID_SHIFT,(64 - (SLB_VSID_SHIFT + VSID_BITS_256M))
 
 	/* r3 = EA, r11 = VSID data */
 	/*
@@ -287,7 +291,11 @@  _GLOBAL(slb_compare_rr_to_size)
 slb_finish_load_1T:
 	srdi	r10,r10,40-28		/* get 1T ESID */
 	ASM_VSID_SCRAMBLE(r10,r9,1T)
-	rldimi	r11,r10,SLB_VSID_SHIFT_1T,16	/* combine VSID and flags */
+	/*
+	 * bits above VSID_BITS_1T need to be ignored from r10
+	 * also combine VSID and flags
+	 */
+	rldimi	r11,r10,SLB_VSID_SHIFT_1T,(64 - (SLB_VSID_SHIFT_1T + VSID_BITS_1T))
 	li	r10,MMU_SEGSIZE_1T
 	rldimi	r11,r10,SLB_VSID_SSIZE_SHIFT,0	/* insert segment size */