boot.S

.section ".text.boot"

.global _start

_start:
	mrc p15,#0,r1,c0,c0,#5
	and r1,r1,#3
	cmp r1,#0
	bne halt

	mov sp,#0x8000
	
	ldr r4, = __bss_start
	ldr r9, = __bss_end
	mov r5, #0
	mov r6, #0
	mov r7, #0
	mov r8, #0
		
	b 2f
1: 
	stmia r4!, {r5-r8}
2:
	cmp r4,r9
	blo 1b
	
	ldr r3, =kernel_main
	blx r3

halt:
	wfe
	b halt