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add copious amount of comments

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Corwin Kuiper 2021-04-03 18:37:09 +01:00
parent 6a3359c23b
commit bc6f3e6f80
1 changed files with 10 additions and 10 deletions
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20
interrupt_simple.s
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@ -3,15 +3,15 @@
.global InterruptHandlerSimple
.align
InterruptHandlerSimple:
ldr r2, =0x04000200
ldrh r1, [r2]
ldrh r3, [r2, #2]
and r0, r1, r3
strh r0, [r2, #2]
ldr r2, =0x04000200 @ interrupt enable register location
ldrh r1, [r2] @ load 16 bit interrupt enable to r1
ldrh r3, [r2, #2] @ load 16 bit interrupt request to r3
and r0, r1, r3 @ interrupts both enabled and requested
strh r0, [r2, #2] @ store to interrupt request
ldr r2, =0x03007FF8
ldrh r1, [r2]
orr r1, r1, r0
strh r1, [r2]
ldr r2, =0x03007FF8 @ load bios interrupt request location
ldrh r1, [r2] @ load bios interrupt requests
orr r1, r1, r0 @ or with enabled and requested interrupts
strh r1, [r2] @ acknowlege bios requests
bx lr
bx lr @ return to bios