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18 lines
680 B
ArmAsm
18 lines
680 B
ArmAsm
@ An interrupt handler that simply acknowledges all interrupts
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.arm
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.global InterruptHandlerSimple
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.align
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InterruptHandlerSimple:
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ldr r2, =0x04000200 @ interrupt enable register location
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ldrh r1, [r2] @ load 16 bit interrupt enable to r1
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ldrh r3, [r2, #2] @ load 16 bit interrupt request to r3
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and r0, r1, r3 @ interrupts both enabled and requested
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strh r0, [r2, #2] @ store to interrupt request
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ldr r2, =0x03007FF8 @ load bios interrupt request location
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ldrh r1, [r2] @ load bios interrupt requests
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orr r1, r1, r0 @ or with enabled and requested interrupts
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strh r1, [r2] @ acknowlege bios requests
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bx lr @ return to bios
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