ide: Reset current_addr after stopping DMA
Whenever SSBM is reset in the command register all state information is lost. Restarting DMA means that current_addr must be reset to the base address of the PRD table. The OS is not required to change the base address register before starting a DMA operation, it can reuse the value it wrote for an earlier request. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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@ -65,6 +65,7 @@ void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)
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#endif
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#endif
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}
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}
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} else {
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} else {
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bm->cur_addr = bm->addr;
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if (!(bm->status & BM_STATUS_DMAING)) {
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if (!(bm->status & BM_STATUS_DMAING)) {
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bm->status |= BM_STATUS_DMAING;
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bm->status |= BM_STATUS_DMAING;
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/* start dma transfer if possible */
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/* start dma transfer if possible */
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@ -101,7 +102,6 @@ static void bmdma_addr_write(IORange *ioport, uint64_t addr,
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#endif
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#endif
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bm->addr &= ~(mask << shift);
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bm->addr &= ~(mask << shift);
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bm->addr |= ((data & mask) << shift) & ~3;
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bm->addr |= ((data & mask) << shift) & ~3;
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bm->cur_addr = bm->addr;
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}
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}
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const IORangeOps bmdma_addr_ioport_ops = {
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const IORangeOps bmdma_addr_ioport_ops = {
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