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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-01-20 07:50:21 +0100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-20 03:03:22 +0200
commit2dd60d79e0202628a47af9812a84d502cc63628c (patch)
tree03a114dcb4a8c3b75ec689d372abd331aff5a555 /arch/powerpc/kernel/entry_64.S
parentpowerpc: Define CPU feature for Architected 2.06 HV mode (diff)
downloadlinux-2dd60d79e0202628a47af9812a84d502cc63628c.tar.xz
linux-2dd60d79e0202628a47af9812a84d502cc63628c.zip
powerpc: In HV mode, use HSPRG0 for PACA
When running in Hypervisor mode (arch 2.06 or later), we store the PACA in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be lost during a "nap" power management operation (though they aren't currently on POWER7) and this enables use of SPRG1 by KVM guests. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
-rw-r--r--arch/powerpc/kernel/entry_64.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d82878c4daa6..dbf5bfafd7bc 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -838,7 +838,7 @@ _GLOBAL(enter_rtas)
_STATIC(rtas_return_loc)
/* relocation is off at this point */
- mfspr r4,SPRN_SPRG_PACA /* Get PACA */
+ GET_PACA(r4)
clrldi r4,r4,2 /* convert to realmode address */
bcl 20,31,$+4
@@ -869,7 +869,7 @@ _STATIC(rtas_restore_regs)
REST_8GPRS(14, r1) /* Restore the non-volatiles */
REST_10GPRS(22, r1) /* ditto */
- mfspr r13,SPRN_SPRG_PACA
+ GET_PACA(r13)
ld r4,_CCR(r1)
mtcr r4