.section ".text.boot"

.global _start

_start:
	// read cpu id, stop slave cores
	mrs x1, mpidr_el1
	and x1, x1, #3
	cbz x1, run
	// cpu id > 0, fallback to wait
wait:
	wfe
	b wait

run: // cpu id == 0
  mov x20, x0

	bl el2_to_el1

	adrp x0, __stack_end
	mov sp, x0

	// clear bss
	adr x0, __bss_start
	adr x1, __bss_end
	bl memzero

	mov x0, x20
	bl main
	b wait

el2_to_el1:
	mov x0, (1 << 31)
	msr hcr_el2, x0
	mov x0, 0x3c5
	msr spsr_el2, x0
	msr elr_el2, lr
	eret