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Allow timer to be virtualized. (c2woody)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1876
This commit is contained in:
Peter Veenstra 2004-07-06 17:12:28 +00:00
parent 7d03a1a0d8
commit 53fa77866a
1 changed files with 12 additions and 2 deletions
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14
src/ints/bios.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.33 2004-06-20 16:56:55 harekiet Exp $ */
/* $Id: bios.cpp,v 1.34 2004-07-06 17:12:28 qbix79 Exp $ */
#include <time.h>
#include "dosbox.h"
@ -139,7 +139,6 @@ static Bitu INT8_Handler(void) {
Bit16u oldax = reg_ax;
// run int 1c
CALLBACK_RunRealInt(0x1c);
IO_Write(0x20,0x20);
// restore old values
SegSet16(ds,oldds);
reg_dx = olddx;
@ -420,6 +419,17 @@ void BIOS_Init(Section* sec) {
//a new system
call_int8=CALLBACK_Allocate();
CALLBACK_Setup(call_int8,&INT8_Handler,CB_IRET);
phys_writeb(CB_BASE+(call_int8<<4)+0,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(call_int8<<4)+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(call_int8<<4)+2,call_int8); //The immediate word
phys_writeb(CB_BASE+(call_int8<<4)+4,(Bit8u)0x50); // push ax
phys_writeb(CB_BASE+(call_int8<<4)+5,(Bit8u)0xb0); // mov al, 0x20
phys_writeb(CB_BASE+(call_int8<<4)+6,(Bit8u)0x20);
phys_writeb(CB_BASE+(call_int8<<4)+7,(Bit8u)0xe6); // out 0x20, al
phys_writeb(CB_BASE+(call_int8<<4)+8,(Bit8u)0x20);
phys_writeb(CB_BASE+(call_int8<<4)+9,(Bit8u)0x58); // pop ax
phys_writeb(CB_BASE+(call_int8<<4)+10,(Bit8u)0xcf); // iret
mem_writed(BIOS_TIMER,0); //Calculate the correct time
RealSetVec(0x8,CALLBACK_RealPointer(call_int8));
/* INT 11 Get equipment list */