1 f56312c5 2023-02-14 continue .section ".text.boot"
 2 f56312c5 2023-02-14 continue 
 3 f56312c5 2023-02-14 continue .global _start
 4 f56312c5 2023-02-14 continue _start:
 5 f56312c5 2023-02-14 continue     mrs     x0, mpidr_el1
 6 f56312c5 2023-02-14 continue     and     x0, x0, #0xffffff
 7 f56312c5 2023-02-14 continue     cbz     x0, _first_processor
 8 f56312c5 2023-02-14 continue 
 9 f56312c5 2023-02-14 continue     // hang all non primary CPU
10 f56312c5 2023-02-14 continue _idle:
11 f56312c5 2023-02-14 continue     wfe
12 f56312c5 2023-02-14 continue     b       _idle
13 f56312c5 2023-02-14 continue 
14 f56312c5 2023-02-14 continue _first_processor:
15 f56312c5 2023-02-14 continue     // zero out BSS section
16 f56312c5 2023-02-14 continue     adr     x0, bss_begin
17 f56312c5 2023-02-14 continue     adr     x1, bss_end
18 f56312c5 2023-02-14 continue _zero_bss:
19 f56312c5 2023-02-14 continue     str     xzr, [x0], #8
20 f56312c5 2023-02-14 continue     cmp     x0, x1
21 f56312c5 2023-02-14 continue     b.lt    _zero_bss
22 f56312c5 2023-02-14 continue 
23 f56312c5 2023-02-14 continue     # set stack before boot code and call kernel
24 f56312c5 2023-02-14 continue     adr     x0, _start
25 f56312c5 2023-02-14 continue     mov     sp, x0
26 f56312c5 2023-02-14 continue     bl      kernel_entry_point
27 f56312c5 2023-02-14 continue     b       _idle