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disable interrupts during handler

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This commit is contained in:
Corwin Kuiper 2021-06-25 23:34:58 +01:00
parent 9bab2a75d0
commit e22564a29c
1 changed files with 10 additions and 0 deletions
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10
agb/interrupt_simple.s
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@ -6,6 +6,11 @@
InterruptHandlerSimple: InterruptHandlerSimple:
ldr r2, =0x04000200 @ interrupt enable register location ldr r2, =0x04000200 @ interrupt enable register location
mov r1, #0
strh r1, [r2, #8]
push {r2}
ldrh r1, [r2] @ load 16 bit interrupt enable to r1 ldrh r1, [r2] @ load 16 bit interrupt enable to r1
ldrh r3, [r2, #2] @ load 16 bit interrupt request to r3 ldrh r3, [r2, #2] @ load 16 bit interrupt request to r3
and r0, r1, r3 @ interrupts both enabled and requested and r0, r1, r3 @ interrupts both enabled and requested
@ -33,5 +38,10 @@ InterruptHandlerSimple:
bic r2, r2, #0xD bic r2, r2, #0xD
msr cpsr_c, r2 msr cpsr_c, r2
pop {r2}
mov r1, #0
strh r1, [r2, #8]
bx lr @ return to bios bx lr @ return to bios
.pool .pool