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.section ".text.kernel"
.globl kernel_main
kernel_main:
push {lr}
bl uart_init
bl enable_irq
bl enable_fiq
bl check_fiq_status
ldr r0, =os_info
bl uart_string
kernel_main.loop:
bl io_halt
b kernel_main.loop
pop {lr}
check_fiq_status:
push {lr}
mov r2, #0xB20C
movt r2, #0x3F00
mov r3, #0xC1
movt r3, #0
str r3, [r2]
ldr r3, [r2]
push {r3}
mov r0, r3
bl uart_hex
pop {r3}
tst r3, #0x80
beq check_fiq_status.off
ldr r0, =fiq_on
bl uart_string
b check_fiq_status.exit
check_fiq_status.off:
ldr r0, =fiq_off
bl uart_string
check_fiq_status.exit:
pop {pc}
.section ".data"
os_info:
.asciz "Sergey Bilovytskyy's Real Time Operating System\n Version 0.0a\n Interrupt 01: uart rx interrupt\n Exit : Ctrl-A x\n Monitor : Ctrl-A c\n\n"
fiq_on:
.asciz "\nFIQ - Enabled\n"
fiq_off:
.asciz "\nFIQ - Disabled\n"
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