106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*******************************************************************************
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* NewOswan
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* dma.c:
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*
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* Created by Manoël Trapier on 19/12/2021.
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* Copyright (c) 2014-2022 986-Studio. All rights reserved.
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*
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******************************************************************************/
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#if 0
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Need to check how to differenciate all the DMA types.
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WRITE:
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case 0x48: // DMA
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// bit 7 set to start dma transfer
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if (value & 0x80)
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{
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uint32_t dma_start = (ws_ioRam[0x41] << 8) | (ws_ioRam[0x40]) | (ws_ioRam[0x42] << 16);
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uint32_t dma_dest = (ws_ioRam[0x45] << 8) | (ws_ioRam[0x44]) | (ws_ioRam[0x43] << 16);
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uint32_t dma_size = (ws_ioRam[0x47] << 8) | (ws_ioRam[0x46]);
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uint8_t dma_inc = (value & 0x01) ? -1: 1;
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Log(TLOG_VERBOSE, "DMA", "Starting DMA from %08X to %08X (len: %08X, inc: %d)",
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dma_start, dma_dest, dma_size, dma_inc);
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for (uint32_t ix = 0 ; ix < dma_size ; ix++)
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{
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mem_writemem20(dma_dest, mem_readmem20(dma_start));
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dma_start += dma_inc;
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dma_dest += dma_inc;
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}
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ws_ioRam[0x47] = 0;
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ws_ioRam[0x46] = 0;
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ws_ioRam[0x41] = (uint8_t)(dma_start >> 8);
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ws_ioRam[0x40] = (uint8_t)(dma_start & 0xff);
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ws_ioRam[0x45] = (uint8_t)(dma_dest >> 8);
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ws_ioRam[0x44] = (uint8_t)(dma_dest & 0xff);
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ws_ioRam[0x48] = 0;
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}
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break;
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#endif
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#if 0
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/* DMAs */
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case 0x40:
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case 0x41:
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case 0x42:
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case 0x43:
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case 0x44:
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case 0x45:
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case 0x46:
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case 0x47:
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break;
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case 0x48: // DMA
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// bit 7 set to start dma transfer
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if (value & 0x80)
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{
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uint32_t dma_start = (ws_ioRam[0x41] << 8) | (ws_ioRam[0x40]) | (ws_ioRam[0x42] << 16);
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uint32_t dma_dest = (ws_ioRam[0x45] << 8) | (ws_ioRam[0x44]) | (ws_ioRam[0x43] << 16);
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uint32_t dma_size = (ws_ioRam[0x47] << 8) | (ws_ioRam[0x46]);
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uint8_t dma_inc = (value & 0x01) ? -1: 1;
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Log(TLOG_VERBOSE, "DMA", "Starting DMA from %08X to %08X (len: %08X, inc: %d)",
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dma_start, dma_dest, dma_size, dma_inc);
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for (uint32_t ix = 0 ; ix < dma_size ; ix++)
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{
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mem_writemem20(dma_dest, mem_readmem20(dma_start));
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dma_start += dma_inc;
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dma_dest += dma_inc;
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}
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ws_ioRam[0x47] = 0;
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ws_ioRam[0x46] = 0;
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ws_ioRam[0x41] = (uint8_t)(dma_start >> 8);
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ws_ioRam[0x40] = (uint8_t)(dma_start & 0xff);
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ws_ioRam[0x45] = (uint8_t)(dma_dest >> 8);
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ws_ioRam[0x44] = (uint8_t)(dma_dest & 0xff);
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ws_ioRam[0x48] = 0;
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}
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break;
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/* DMA Start! */
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case 0x52:
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break;
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#endif
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