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Added switch to protected mode call 0x89

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1464
This commit is contained in:
Sjoerd van der Berg 2003-11-26 09:25:51 +00:00
parent f7678d231b
commit 6d1d97b139
1 changed files with 20 additions and 1 deletions
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21
src/ints/bios.cpp
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@ -16,12 +16,13 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.23 2003-11-14 00:04:25 harekiet Exp $ */
/* $Id: bios.cpp,v 1.24 2003-11-26 09:25:51 harekiet Exp $ */
#include <time.h>
#include "dosbox.h"
#include "bios.h"
#include "regs.h"
#include "cpu.h"
#include "callback.h"
#include "inout.h"
#include "mem.h"
@ -248,6 +249,24 @@ static Bitu INT15_Handler(void) {
LOG(LOG_BIOS,LOG_NORMAL)("INT15:Function 0x88 Remaining %04X kb",reg_ax);
CALLBACK_SCF(false);
break;
case 0x89: /* SYSTEM - SWITCH TO PROTECTED MODE */
{
IO_Write(0x20,0x10);IO_Write(0x21,reg_bh);IO_Write(0x21,0);
IO_Write(0xA0,0x10);IO_Write(0xA1,reg_bl);IO_Write(0xA1,0);
MEM_A20_Enable(true);
PhysPt table=SegPhys(es)+reg_si;
CPU_LGDT(mem_readw(table+0x8),mem_readd(table+0x8+0x2) & 0xFFFFFF);
CPU_LIDT(mem_readw(table+0x10),mem_readd(table+0x10+0x2) & 0xFFFFFF);
CPU_SET_CRX(0,CPU_GET_CRX(0)|1);
CPU_SetSegGeneral(ds,0x18);
CPU_SetSegGeneral(es,0x20);
CPU_SetSegGeneral(ss,0x28);
reg_sp+=6; //Clear stack of interrupt frame
CPU_SetFlags(0,FMASK_ALL);
reg_ax=0;
CPU_JMP(false,0x30,reg_cx);
}
break;
case 0x90: /* OS HOOK - DEVICE BUSY */
CALLBACK_SCF(false);
reg_ah=0;