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Added status bit.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@491
This commit is contained in:
Sjoerd van der Berg 2002-11-10 00:16:34 +00:00
parent 38117780b5
commit 055e02bb41
1 changed files with 10 additions and 1 deletions
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11
src/hardware/dma.cpp
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@ -91,6 +91,11 @@ static Bit8u read_dma(Bit32u port) {
}
cont->flipflop=!cont->flipflop;
break;
case 0x08: /* Read Status */
ret=cont->status_reg;
cont->status_reg&=0xf; /* Clear lower 4 bits on read */
break;
default:
LOG_WARN("DMA:Unhandled read from %d",port);
}
@ -128,6 +133,8 @@ static void write_dma(Bit32u port,Bit8u val) {
case 0x09: /* Request Register */
if (val&4) {
/* Set Request bit */
Bitu channel = val & 0x03;
cont->status_reg |= (1 << (channel+4));
} else {
Bitu channel = val & 0x03;
cont->status_reg &= ~(1 << (channel+4));
@ -183,13 +190,15 @@ Bit16u DMA_8_Read(Bit32u dmachan,Bit8u * buffer,Bit16u count) {
chan->current_address=chan->base_address;
DMA_DEBUG("DMA:Transfer from %d size %d",(chan->page << 16)+chan->base_address,chan->current_count);
}
if (chan->current_count>=count) {
if (chan->current_count>count) {
MEM_BlockRead(chan->address,buffer,count);
chan->address+=count;
chan->current_address+=count;
chan->current_count-=count;
return count;
} else {
/* Set the end of counter bit */
dma[0].status_reg|=(1 << dmachan);
/* Copy remaining piece of first buffer */
MEM_BlockRead(chan->address,buffer,chan->current_count);
buffer+=chan->current_count;