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added very basic vdma handler(Srecko)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1646
This commit is contained in:
Peter Veenstra 2004-02-02 20:23:54 +00:00
parent 1b371a6a00
commit 79ff8b1c8f
1 changed files with 19 additions and 1 deletions
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20
src/ints/ems.cpp
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@ -16,6 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: ems.cpp,v 1.31 2004-02-02 20:23:54 qbix79 Exp $ */
#include <string.h>
#include <stdlib.h>
@ -92,7 +93,7 @@ struct EMM_Handle {
static EMM_Handle emm_handles[EMM_MAX_HANDLES];
static EMM_Mapping emm_mappings[EMM_MAX_PHYS];
static Bitu call_int67;
static Bitu call_int67,call_vdma;
struct MoveRegion {
Bit32u bytes;
@ -582,8 +583,25 @@ static Bitu INT67_Handler(void) {
return CBRET_NONE;
}
static Bitu INT4B_Handler() {
switch (reg_ah) {
case 0x81:
CALLBACK_SCF(true);
reg_ax=0x1;
break;
default:
LOG(LOG_MISC,LOG_WARN)("Unhandled interrupt 4B function %x",reg_ah);
break;
}
return CBRET_NONE;
}
void EMS_Init(Section* sec) {
/* Virtual DMA interrupt callback */
call_vdma=CALLBACK_Allocate();
CALLBACK_Setup(call_vdma,&INT4B_Handler,CB_IRET);
RealSetVec(0x4b,CALLBACK_RealPointer(call_vdma));
Section_prop * section=static_cast<Section_prop *>(sec);
if (!section->Get_bool("ems")) return;
BIOS_ZeroExtendedSize();