Guest Doorbell interrupts use guest save and restore registers. Add a new
Guest Doorbell exception type to accommodate GSRR0/1 SPRs usage in exception
prolog and fix the exception handler.
Signed-off-by: Mihai Caraman <mihai.cara...@freescale.com>
---
arch/powerpc/include/asm/exception-64e.h | 1 +
arch/powerpc/include/asm/reg.h | 1 +
arch/powerpc/kernel/exceptions-64e.S | 21 +++++++++++++++++++--
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/exception-64e.h
b/arch/powerpc/include/asm/exception-64e.h
index ac13add..e73452f 100644
--- a/arch/powerpc/include/asm/exception-64e.h
+++ b/arch/powerpc/include/asm/exception-64e.h
@@ -37,6 +37,7 @@
* critical data
*/
+#define PACA_EXGDBELL PACA_EXGEN
/* We are out of SPRGs so we save some things in the PACA. The normal
* exception frame is smaller than the CRIT or MC one though
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 6386086..349d9c3 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -863,6 +863,7 @@
#define SPRN_SPRG_TLB_EXFRAME SPRN_SPRG2
#define SPRN_SPRG_TLB_SCRATCH SPRN_SPRG6
#define SPRN_SPRG_GEN_SCRATCH SPRN_SPRG0
+#define SPRN_SPRG_GDBELL_SCRATCH SPRN_SPRG_GEN_SCRATCH
#define SET_PACA(rX) mtspr SPRN_SPRG_PACA,rX
#define GET_PACA(rX) mfspr rX,SPRN_SPRG_PACA
diff --git a/arch/powerpc/kernel/exceptions-64e.S
b/arch/powerpc/kernel/exceptions-64e.S
index 0243b1b..0f58a95 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -59,6 +59,10 @@
#define SPRN_GEN_SRR0 SPRN_SRR0
#define SPRN_GEN_SRR1 SPRN_SRR1
+#define GDBELL_SET_KSTACK GEN_SET_KSTACK
+#define SPRN_GDBELL_SRR0 SPRN_GSRR0
+#define SPRN_GDBELL_SRR1 SPRN_GSRR1
+
#define CRIT_SET_KSTACK
\
ld r1,PACA_CRIT_STACK(r13); \
subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
@@ -89,10 +93,13 @@
#define MC_EXCEPTION_PROLOG(n, addition) \
EXCEPTION_PROLOG(n, MC, addition##_MC(n))
+#define GDBELL_EXCEPTION_PROLOG(n, addition) \
+ EXCEPTION_PROLOG(n, GDBELL, addition##_GDBELL(n))
/* Variants of the "addition" argument for the prolog
*/
#define PROLOG_ADDITION_NONE_GEN(n)
+#define PROLOG_ADDITION_NONE_GDBELL(n)
#define PROLOG_ADDITION_NONE_CRIT(n)
#define PROLOG_ADDITION_NONE_DBG(n)
#define PROLOG_ADDITION_NONE_MC(n)
@@ -543,8 +550,18 @@ kernel_dbg_exc:
// b ret_from_crit_except
b .
-/* Guest Doorbell */
- MASKABLE_EXCEPTION(0x2c0, guest_doorbell, .unknown_exception, ACK_NONE)
+/*
+ * Guest doorbell interrupt
+ * This general exception use GSRRx save/restore registers
+ */
+ START_EXCEPTION(guest_doorbell);
+ GDBELL_EXCEPTION_PROLOG(0x2c0, PROLOG_ADDITION_NONE)
+ EXCEPTION_COMMON(0x2c0, PACA_EXGEN, INTS_KEEP)
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ bl .save_nvgprs
+ INTS_RESTORE_HARD
+ bl .unknown_exception
+ b .ret_from_except
/* Guest Doorbell critical Interrupt */
START_EXCEPTION(guest_doorbell_crit);
--
1.7.4.1
--
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