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Add reading of dma page register

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1754
This commit is contained in:
Sjoerd van der Berg 2004-04-03 06:58:13 +00:00
parent 74f0e5290c
commit dfeec430b8
1 changed files with 19 additions and 4 deletions
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23
src/hardware/dma.cpp
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@ -16,10 +16,6 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Based the port handling from the bochs dma code.
*/
#include <string.h>
#include "dosbox.h"
#include "mem.h"
@ -146,11 +142,22 @@ static void DMA_Write_PortB(Bit32u port,Bit8u val) {
}
}
static void DMA_Write_PortW(Bit32u port,Bit16u val) {
LOG_MSG("Ahh 16bit write port %x val %x",port,val);
}
static Bit8u DMA_Read_PortB(Bit32u port) {
if (port<0x10) {
return DMA_ReadControllerReg(DmaControllers[0],port,1);
} else if (port>=0xc0 && port <=0xdf) {
return DMA_ReadControllerReg(DmaControllers[1],(port-0xc0) >> 1,1);
} else switch (port) {
case 0x81:return DmaChannels[2]->pagenum;
case 0x82:return DmaChannels[3]->pagenum;
case 0x83:return DmaChannels[1]->pagenum;
case 0x89:return DmaChannels[6]->pagenum;
case 0x8a:return DmaChannels[7]->pagenum;
case 0x8b:return DmaChannels[5]->pagenum;
}
}
@ -238,6 +245,7 @@ void DMA_Init(Section* sec) {
}
for (i=0;i<0x10;i++) {
IO_RegisterWriteBHandler(i,DMA_Write_PortB);
IO_RegisterWriteWHandler(i,DMA_Write_PortW);
IO_RegisterReadBHandler(i,DMA_Read_PortB);
if (machine==MCH_VGA) {
IO_RegisterWriteBHandler(0xc0+i*2,DMA_Write_PortB);
@ -251,6 +259,13 @@ void DMA_Init(Section* sec) {
IO_RegisterWriteBHandler(0x8a,DMA_Write_PortB);
IO_RegisterWriteBHandler(0x8b,DMA_Write_PortB);
IO_RegisterReadBHandler(0x81,DMA_Read_PortB);
IO_RegisterReadBHandler(0x82,DMA_Read_PortB);
IO_RegisterReadBHandler(0x83,DMA_Read_PortB);
IO_RegisterReadBHandler(0x89,DMA_Read_PortB);
IO_RegisterReadBHandler(0x8a,DMA_Read_PortB);
IO_RegisterReadBHandler(0x8b,DMA_Read_PortB);
}