79 lines
1.4 KiB
ArmAsm
79 lines
1.4 KiB
ArmAsm
/*
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** gint:dma:inth - Interrupt handler for the DMA
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** An easy one, just clears some flags and marks all transfers as finished.
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*/
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/* DMA TRANSFER ENDED INTERRUPT HANDLER - BYTES */
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.global _inth_dma_dma0
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_inth_dma_dma0:
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/* Clear the TE flag and DMA Enable in CHCR */
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mov.l 1f, r1
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mov.l @r1, r0
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mov #-4, r2
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and r2, r0
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mov.l r0, @r1
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/* Clear the AE and NMIF flags in OR, and cut the master switch */
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add #0x34, r1
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mov.w @r1, r0
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shlr8 r0
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shll8 r0
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mov.w r0, @r1
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rte
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nop
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nop
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nop
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.global _inth_dma_dma1
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_inth_dma_dma1:
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/* Clear the TE flag and DMA Enable in CHCR */
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mov.l 2f, r1
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mov.l @r1, r0
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mov #-4, r2
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and r2, r0
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mov.l r0, @r1
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/* Clear the AE and NMIF flags in OR, and cut the master switch */
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add #0x34, r1
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mov.w @r1, r0
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shlr8 r0
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shll8 r0
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mov.w r0, @r1
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rte
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nop
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nop
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nop
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.global _inth_dma_dma2
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_inth_dma_dma2:
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/* Clear the TE flag and DMA Enable in CHCR */
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mov.l 3f, r1
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mov.l @r1, r0
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mov #-4, r2
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and r2, r0
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mov.l r0, @r1
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/* Clear the AE and NMIF flags in OR, and cut the master switch */
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add #0x34, r1
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mov.w @r1, r0
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shlr8 r0
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shll8 r0
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mov.w r0, @r1
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rte
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nop
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nop
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nop
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1: .long 0xfe00802c /* CHCR0 - OR is 0x34 bytes after this */
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2: .long 0xfe00803c
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3: .long 0xfe00804c |