- bootloader multi target

git-svn-id: http://moon:8086/svn/mips@98 a8ebac50-d88d-4704-bea3-6648445a41b3

src/bootloader/startup.S

@@ -0,0 +1,53 @@
+		.file	"startup.S"
+	
+		.text
+		.section .init,"ax"
+		.align	2
+	
+_start:
+		.set	noreorder
+
+		# set stack pointer 
+		la	$sp, stack_ptr
+
+		# Set status register
+		# Kernel mode (SR[1]=0), Int disabled(SR[0]=0), after RFE into main
+		li	$26, 0x1040000C
+		mtc0	$26, $12
+		li		$26, 0x00000000
+		mtc0	$26, $13
+
+		mfc0	$26, $15
+		nop
+		mtc0	$26, $31
+
+		# Invalidate I-Cache
+		cop0	32
+		
+		# Invalidate D-Cache
+		cop0	34
+
+		# zero bss
+		la $8, __bss_start
+		la $9, _end
+$zeroise:		
+		sw $0, 0($8)
+		bne $8, $9, $zeroise
+		addiu	$8, 4
+
+_init:
+		# Call libsys_init
+		la $k0, libsys_init
+		jalr $k0
+		nop
+
+		la $26, main
+		
+		jalr $26
+		nop
+_terminate:
+		nop
+		j		_terminate
+		nop
+	
+		.set	reorder