.section ".text.boot"

.global _start
_start:
    mrs     x0, mpidr_el1
    and     x0, x0, #0xffffff
    cbz     x0, _first_processor

    // hang all non primary CPU
_idle:
    wfe
    b       _idle

_first_processor:
    // zero out BSS section
    adr     x0, bss_begin
    adr     x1, bss_end
_zero_bss:
    str     xzr, [x0], #8
    cmp     x0, x1
    b.lt    _zero_bss

    # set stack before boot code and call kernel
    adr     x0, _start
    mov     sp, x0
    bl      kernel_entry_point
    b       _idle