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| author | Mihai Caraman <mihai.caraman@freescale.com> | 2012-08-06 03:27:04 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-05 15:35:43 +1000 |
| commit | 5473eb1c07009956be5f4df65d51f8e24d8eb1de (patch) | |
| tree | 69ca3a9ea3aee261bc1db482d63ed82b34df5bdd /arch/powerpc/kernel/exceptions-64e.S | |
| parent | a1310757218e0757ee77d2ce05c43028430ed9dd (diff) | |
| download | lwn-5473eb1c07009956be5f4df65d51f8e24d8eb1de.tar.gz lwn-5473eb1c07009956be5f4df65d51f8e24d8eb1de.zip | |
powerpc/booke64: Use GSRR registers in Guest Doorbell interrupts
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.caraman@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 0243b1b29031..0f58a95fd216 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); |