powerpc/85xx:Avoid hardcoded vector address for IVORs

For e500 and e500v2 architecturees processor IVPR address should be alinged on
64K boundary.

in start.S, CONFIG_SYS_MONITOR_BASE is stored blindly in IVPR assuming it to be
64K aligned. It may not be true always. If it is not aligned, IVPR + IVORs may
not point to an exception handler.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

arch/powerpc/cpu/mpc85xx/start.S

@@ -1,5 +1,5 @@
 /*
- * Copyright 2004, 2007-2011 Freescale Semiconductor, Inc.
+ * Copyright 2004, 2007-2012 Freescale Semiconductor, Inc.
  * Copyright (C) 2003  Motorola,Inc.
  *
  * See file CREDITS for list of people who contributed to this
@@ -183,37 +183,40 @@ l2_disabled:
 	lis	r1,CONFIG_SYS_MONITOR_BASE@h
 	mtspr	IVPR,r1
 
-	li	r1,0x0100
-	mtspr	IVOR0,r1	/* 0: Critical input */
-	li	r1,0x0200
-	mtspr	IVOR1,r1	/* 1: Machine check */
-	li	r1,0x0300
-	mtspr	IVOR2,r1	/* 2: Data storage */
-	li	r1,0x0400
-	mtspr	IVOR3,r1	/* 3: Instruction storage */
-	li	r1,0x0500
-	mtspr	IVOR4,r1	/* 4: External interrupt */
-	li	r1,0x0600
-	mtspr	IVOR5,r1	/* 5: Alignment */
-	li	r1,0x0700
-	mtspr	IVOR6,r1	/* 6: Program check */
-	li	r1,0x0800
-	mtspr	IVOR7,r1	/* 7: floating point unavailable */
-	li	r1,0x0900
-	mtspr	IVOR8,r1	/* 8: System call */
+	lis	r3,(CONFIG_SYS_MONITOR_BASE & 0xffff)@h
+	ori	r3,r3,(CONFIG_SYS_MONITOR_BASE & 0xffff)@l
+
+	addi	r4,r3,CriticalInput - _start + _START_OFFSET
+	mtspr	IVOR0,r4	/* 0: Critical input */
+	addi	r4,r3,MachineCheck - _start + _START_OFFSET
+	mtspr	IVOR1,r4	/* 1: Machine check */
+	addi	r4,r3,DataStorage - _start + _START_OFFSET
+	mtspr	IVOR2,r4	/* 2: Data storage */
+	addi	r4,r3,InstStorage - _start + _START_OFFSET
+	mtspr	IVOR3,r4	/* 3: Instruction storage */
+	addi	r4,r3,ExtInterrupt - _start + _START_OFFSET
+	mtspr	IVOR4,r4	/* 4: External interrupt */
+	addi	r4,r3,Alignment - _start + _START_OFFSET
+	mtspr	IVOR5,r4	/* 5: Alignment */
+	addi	r4,r3,ProgramCheck - _start + _START_OFFSET
+	mtspr	IVOR6,r4	/* 6: Program check */
+	addi	r4,r3,FPUnavailable - _start + _START_OFFSET
+	mtspr	IVOR7,r4	/* 7: floating point unavailable */
+	addi	r4,r3,SystemCall - _start + _START_OFFSET
+	mtspr	IVOR8,r4	/* 8: System call */
 	/* 9: Auxiliary processor unavailable(unsupported) */
-	li	r1,0x0a00
-	mtspr	IVOR10,r1	/* 10: Decrementer */
-	li	r1,0x0b00
-	mtspr	IVOR11,r1	/* 11: Interval timer */
-	li	r1,0x0c00
-	mtspr	IVOR12,r1	/* 12: Watchdog timer */
-	li	r1,0x0d00
-	mtspr	IVOR13,r1	/* 13: Data TLB error */
-	li	r1,0x0e00
-	mtspr	IVOR14,r1	/* 14: Instruction TLB error */
-	li	r1,0x0f00
-	mtspr	IVOR15,r1	/* 15: Debug */
+	addi	r4,r3,Decrementer - _start + _START_OFFSET
+	mtspr	IVOR10,r4	/* 10: Decrementer */
+	addi	r4,r3,IntervalTimer - _start + _START_OFFSET
+	mtspr	IVOR11,r4	/* 11: Interval timer */
+	addi	r4,r3,WatchdogTimer - _start + _START_OFFSET
+	mtspr	IVOR12,r4	/* 12: Watchdog timer */
+	addi	r4,r3,DataTLBError - _start + _START_OFFSET
+	mtspr	IVOR13,r4	/* 13: Data TLB error */
+	addi	r4,r3,InstructionTLBError - _start + _START_OFFSET
+	mtspr	IVOR14,r4	/* 14: Instruction TLB error */
+	addi	r4,r3,DebugBreakpoint - _start + _START_OFFSET
+	mtspr	IVOR15,r4	/* 15: Debug */
 
 	/* Clear and set up some registers. */
 	li      r0,0x0000