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powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV mode

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This uses feature sections to arrange that we always use HSPRG1
as the scratch register in the interrupt entry code rather than
SPRG2 when we're running in hypervisor mode on POWER7.  This will
ensure that we don't trash the guest's SPRG2 when we are running
KVM guests.  To simplify the code, we define GET_SCRATCH0() and
SET_SCRATCH0() macros like the GET_PACA/SET_PACA macros.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras
2011-04-05 13:59:58 +10:00
committed by Benjamin Herrenschmidt
parent b3e6b5dfcf
commit 673b189a2e
7 changed files with 41 additions and 28 deletions
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26
arch/powerpc/kernel/exceptions-64s.S
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@@ -43,7 +43,7 @@ __start_interrupts:
_machine_check_pSeries:
HMT_MEDIUM
DO_KVM 0x200
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, EXC_STD)
. = 0x300
@@ -51,7 +51,7 @@ _machine_check_pSeries:
data_access_pSeries:
HMT_MEDIUM
DO_KVM 0x300
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
BEGIN_FTR_SECTION
GET_PACA(r13)
std r9,PACA_EXSLB+EX_R9(r13)
@@ -67,7 +67,7 @@ BEGIN_FTR_SECTION
std r11,PACA_EXGEN+EX_R11(r13)
ld r11,PACA_EXSLB+EX_R9(r13)
std r12,PACA_EXGEN+EX_R12(r13)
mfspr r12,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r12)
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R9(r13)
std r12,PACA_EXGEN+EX_R13(r13)
@@ -81,7 +81,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)
data_access_slb_pSeries:
HMT_MEDIUM
DO_KVM 0x380
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
@@ -95,7 +95,7 @@ data_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@@ -120,7 +120,7 @@ data_access_slb_pSeries:
instruction_access_slb_pSeries:
HMT_MEDIUM
DO_KVM 0x480
mtspr SPRN_SPRG_SCRATCH0,r13
SET_SCRATCH0(r13)
GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
@@ -134,7 +134,7 @@ instruction_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@@ -272,7 +272,7 @@ masked_interrupt:
rotldi r10,r10,16
mtspr SPRN_SRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13)
mfspr r13,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r13)
rfid
b .
@@ -285,7 +285,7 @@ masked_Hinterrupt:
rotldi r10,r10,16
mtspr SPRN_HSRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13)
mfspr r13,SPRN_SPRG_HSCRATCH0
GET_SCRATCH0(r13)
hrfid
b .
@@ -293,7 +293,7 @@ masked_Hinterrupt:
do_stab_bolted_pSeries:
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
mfspr r10,SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
@@ -305,14 +305,14 @@ do_stab_bolted_pSeries:
.align 7
system_reset_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD)
.globl machine_check_fwnmi
.align 7
machine_check_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, EXC_STD)
#endif /* CONFIG_PPC_PSERIES */
@@ -327,7 +327,7 @@ slb_miss_user_pseries:
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
mfspr r10,SPRG_SCRATCH0
GET_SCRATCH0(r10)
ld r11,PACA_EXSLB+EX_R9(r13)
ld r12,PACA_EXSLB+EX_R3(r13)
std r10,PACA_EXGEN+EX_R13(r13)