.section .text
.align 4
.global _start
.extern main
.extern _sysstack_start
.extern _bss_start
.extern _bss_end
_start:
	csrr t0, mhartid
	bne  t0, zero, 1f
	li x1, 0
	li x2, 0
	li x3, 0
	li x4, 0
	li x5, 0
	li x6, 0
	li x7, 0
	li x8, 0
	li x9, 0
	li x10, 0
	li x11, 0
	li x12, 0
	li x13, 0
	li x14, 0
	li x15, 0
	li x16, 0
	li x17, 0
	li x18, 0
	li x19, 0
	li x20, 0
	li x21, 0
	li x22, 0
	li x23, 0
	li x24, 0
	li x25, 0
	li x26, 0
	li x27, 0
	li x28, 0
	li x29, 0
	li x30, 0
	li x31, 0
	la t0, _sysstack_start
	li t1, 0x1000
	add sp, t0, t1
	la  t0, _bss_start
	la  t1, _bss_end
_bss_clean_start:
	bgeu t0, t1, _bss_clean_end
	sb zero, 0(t0)
	addi t0, t0, 1
	j _bss_clean_start
_bss_clean_end:
	call main
1:
	/* todo smp */
	wfi
	j 1b