powerpc/book3e-64: Add helper function to setup IVORs

Not all 64-bit Book-3E parts will have fixed IVORs so add a function that
cpusetup code can call to setup the base IVORs (0..15) to match the fixed
offsets.  We need to 'or' part of interrupt_base_book3e into the IVORs
since on parts that have them the IVPR doesn't extend as far down.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/exception-64e.h

@@ -196,6 +196,10 @@ exc_##label##_book3e:
 #define TLB_MISS_STATS_SAVE_INFO
 #endif
 
+#define SET_IVOR(vector_number, vector_offset)	\
+	li	r3,vector_offset@l; 		\
+	ori	r3,r3,interrupt_base_book3e@l;	\
+	mtspr	SPRN_IVOR##vector_number,r3;
 
 #endif /* _ASM_POWERPC_EXCEPTION_64E_H */
 

arch/powerpc/kernel/exceptions-64e.S

@@ -782,5 +782,24 @@ _STATIC(init_thread_book3e)
 
 	blr
 
+_GLOBAL(__setup_base_ivors)
+	SET_IVOR(0, 0x020) /* Critical Input */
+	SET_IVOR(1, 0x000) /* Machine Check */
+	SET_IVOR(2, 0x060) /* Data Storage */ 
+	SET_IVOR(3, 0x080) /* Instruction Storage */
+	SET_IVOR(4, 0x0a0) /* External Input */ 
+	SET_IVOR(5, 0x0c0) /* Alignment */ 
+	SET_IVOR(6, 0x0e0) /* Program */ 
+	SET_IVOR(7, 0x100) /* FP Unavailable */ 
+	SET_IVOR(8, 0x120) /* System Call */ 
+	SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */ 
+	SET_IVOR(10, 0x160) /* Decrementer */ 
+	SET_IVOR(11, 0x180) /* Fixed Interval Timer */ 
+	SET_IVOR(12, 0x1a0) /* Watchdog Timer */ 
+	SET_IVOR(13, 0x1c0) /* Data TLB Error */ 
+	SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
+	SET_IVOR(15, 0x040) /* Debug */
 
+	sync
 
+	blr