[U-Boot] [PATCH 17/26] microblaze: Setup MB vectors if feature is enable for u-boot

Michal Simek
2011-09-13T07:10:12Z

For example: Setup reset vectors if reset address is setup.
Setup user exception vector if user exception is enabled

Signed-off-by: Michal Simek <monstr@monstr.eu>
---
arch/microblaze/cpu/start.S | 34 ++++++++++++++++++++++------------
1 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index d3370c4..17c0e28 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -30,6 +30,13 @@
.text
.global _start
_start:
+ /*
+ * reserve registers:
+ * r10: Stores little/big endian offset for vectors
+ * r2: Stores imm opcode
+ * r3: Stores brai opcode
+ */
+
mts rmsr, r0 /* disable cache */
addi r1, r0, CONFIG_SYS_INIT_SP_OFFSET
addi r1, r1, -4 /* Decrement SP to top of memory */
@@ -47,21 +54,15 @@ _start:
swi r6, r0, 0
lbui r10, r0, 0

- /* add opcode instruction for 32bit jump - 2 instruction imm & brai*/
- addi r6, r0, 0xb0000000 /* hex b000 opcode imm */
- swi r6, r0, 0x0 /* reset address */
- swi r6, r0, 0x8 /* user vector exception */
- swi r6, r0, 0x10 /* interrupt */
- swi r6, r0, 0x20 /* hardware exception */
-
- addi r6, r0, 0xb8080000 /* hew b808 opcode brai*/
- swi r6, r0, 0x4 /* reset address */
- swi r6, r0, 0xC /* user vector exception */
- swi r6, r0, 0x14 /* interrupt */
- swi r6, r0, 0x24 /* hardware exception */
+ /* add opcode instruction for 32bit jump - 2 instruction imm & brai */
+ addi r2, r0, 0xb0000000 /* hex b000 opcode imm */
+ addi r3, r0, 0xb8080000 /* hew b808 opcode brai */

#ifdef CONFIG_SYS_RESET_ADDRESS
/* reset address */
+ swi r2, r0, 0x0 /* reset address - imm opcode */
+ swi r3, r0, 0x4 /* reset address - brai opcode */
+
addik r6, r0, CONFIG_SYS_RESET_ADDRESS
sw r6, r1, r0
lhu r7, r1, r0
@@ -88,6 +89,9 @@ _start:

#ifdef CONFIG_SYS_USR_EXCEP
/* user_vector_exception */
+ swi r2, r0, 0x8 /* user vector exception - imm opcode */
+ swi r3, r0, 0xC /* user vector exception - brai opcode */
+
addik r6, r0, _exception_handler
sw r6, r1, r0
/*
@@ -119,6 +123,9 @@ _start:

#ifdef CONFIG_SYS_INTC_0
/* interrupt_handler */
+ swi r2, r0, 0x10 /* interrupt - imm opcode */
+ swi r3, r0, 0x14 /* interrupt - brai opcode */
+
addik r6, r0, _interrupt_handler
sw r6, r1, r0
lhu r7, r1, r10
@@ -129,6 +136,9 @@ _start:
#endif

/* hardware exception */
+ swi r2, r0, 0x20 /* hardware exception - imm opcode */
+ swi r3, r0, 0x24 /* hardware exception - brai opcode */
+
addik r6, r0, _hw_exception_handler
sw r6, r1, r0
lhu r7, r1, r10
--
1.5.5.6