diff options
| author | Christian Cunningham <cc@localhost> | 2021-10-14 14:24:43 -0700 |
|---|---|---|
| committer | Christian Cunningham <cc@localhost> | 2021-10-14 14:24:43 -0700 |
| commit | 3e8104ab13d257389a695e1db56ddc77c10a1bc8 (patch) | |
| tree | 00aea8eb56ab3adfcfde44f75606e4b4fb721c9d /src | |
| parent | 4024657bc4b6983e23540716be9ef3ce484aba2b (diff) | |
Added FIQ
Diffstat (limited to 'src')
| -rw-r--r-- | src/boot.S | 14 | ||||
| -rw-r--r-- | src/kernel.S | 5 |
2 files changed, 17 insertions, 2 deletions
@@ -14,7 +14,7 @@ reset: // set vector address. ldr r0, =vector - mcR P15, 0, r0, c12, c0, 0 + mcr p15, 0, r0, c12, c0, 0 // save cpsr. mrs r0, cpsr @@ -74,6 +74,16 @@ disable_irq: cpsid i bx lr +.globl enable_fiq +enable_fiq: + cpsie i + bx lr + +.globl disable_fiq +disable_fiq: + cpsid f + bx lr + .align 5 vector: ldr pc, reset_handler @@ -93,6 +103,8 @@ data_handler: .word io_halt unused_handler: .word io_halt irq_handler: .word irq fiq_handler: .word io_halt +//irq_handler: .word io_halt +//fiq_handler: .word irq .global a_irq_handler a_irq_handler: diff --git a/src/kernel.S b/src/kernel.S index 02894a6..f82d624 100644 --- a/src/kernel.S +++ b/src/kernel.S @@ -10,10 +10,13 @@ kernel_main: mov r0, #0x00 kernel_main.a: cmp r0, #0x100 - beq kernel_main.loop + beq kernel_main.b bl uart_char add r0, #1 b kernel_main.a +kernel_main.b: + mov r0, #0x0A + bl uart_char kernel_main.loop: bl io_halt b kernel_main.loop |