mirror of
https://github.com/jserv/armv8-hello.git
synced 2025-05-22 02:43:17 +00:00
30 lines
407 B
ArmAsm
30 lines
407 B
ArmAsm
#include "reg.h"
|
|
|
|
.text
|
|
|
|
.globl _start
|
|
_start:
|
|
/* init UART (38400 8N1) */
|
|
ldr x4, =UART_BASE // UART base
|
|
mov w5, #0x10 // IBRD
|
|
str w5, [x4, #0x24]
|
|
mov w5, #0xc300
|
|
orr w5, w5, #0x0001 // CR
|
|
str w5, [x4, #0x30]
|
|
|
|
/* check CPU ID */
|
|
mrs x0, mpidr_el1
|
|
tst x0, #15
|
|
b.ne other_cpu
|
|
b.eq boot_cpu
|
|
|
|
boot_cpu:
|
|
/* configure stack */
|
|
adrp x0, stacktop
|
|
mov sp, x0
|
|
|
|
b main
|
|
|
|
other_cpu:
|
|
b other_cpu
|