Initial version

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git-svn-id: http://moon:8086/svn/vhdl/trunk@272 cc03376c-175c-47c8-b038-4cd826a8556b

lib/CPUs/MIPS/bsp/examples/bootloader/kernel_boot.S

@@ -0,0 +1,45 @@
+		.file	"kernel.S"
+
+		.section .ktext,"ax"
+		.align	2
+
+		.macro kpush reg
+		addiu	$sp, 4
+		sw		\reg, 0($sp)
+		.endm
+		
+		.macro kpop reg
+		lw		\reg, 0($sp)
+		addiu	$sp, -4
+		.endm
+
+_exc_handler:
+
+		.set	noreorder
+		
+		# Set Error LED and ExcCode LEDs
+		# Get Cause
+		mfc0	$26, $13
+		la 		$27, sys_led_port
+		srl		$26, 2
+		andi	$26, 0x000F
+		or 		$26, $27
+		sw 		$26, 0($27)
+
+		# wait for all interrupts = 0
+$w4x:	mfc0	$26, $13
+		nop
+		srl		$26, 8
+		andi	$26, 0xFF
+		bnez	$26, $w4x
+		nop
+		
+		# Get return address
+		mfc0	$26, $14
+
+		# Return
+		nop
+		jr	$26
+		rfe
+		.set	reorder
+