valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

initialize a few fixed-position bios interrupt locations

Browse source 
(fixes Star Fleet 2, Defender booter), revector some dos-occupied
ints when booting/set stack to safe values (fixes some booters)


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2423
This commit is contained in:
Sebastian Strohhäcker 2006-01-05 14:14:53 +00:00
parent a8f1afe1c2
commit 146d4b3380
2 changed files with 14 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
src/dos/dos_programs.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dos_programs.cpp,v 1.49 2005-12-19 20:39:51 c2woody Exp $ */
/* $Id: dos_programs.cpp,v 1.50 2006-01-05 14:14:52 c2woody Exp $ */
#include <stdlib.h>
#include <string.h>
@ -471,12 +471,17 @@ public:
WriteOut(MSG_Get("PROGRAM_BOOT_BOOT"), drive);
for(i=0;i<512;i++) real_writeb(0, 0x7c00 + i, bootarea.rawdata[i]);
/* revector some dos-allocated interrupts */
real_writed(0,0x01*4,0xf000ff53);
real_writed(0,0x03*4,0xf000ff53);
SegSet16(cs, 0);
reg_ip = 0x7c00;
SegSet16(ds, 0);
SegSet16(ss, 0);//Buckrogers Booter
reg_esp = 0x400;
SegSet16(es, 0);
/* set up stack at a safe place */
SegSet16(ss, 0x7000);
reg_esp = 0xfffe;
reg_esi = 0;
reg_ecx = 1;
reg_ebp = 0;

7
src/ints/bios.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.55 2005-12-20 21:33:02 c2woody Exp $ */
/* $Id: bios.cpp,v 1.56 2006-01-05 14:14:53 c2woody Exp $ */
#include "dosbox.h"
#include "mem.h"
@ -984,6 +984,11 @@ public:
size_extended=IO_Read(0x71);
IO_Write(0x70,0x31);
size_extended|=(IO_Read(0x71) << 8);
phys_writeb(0xfff53,0xcf); /* bios default interrupt vector location */
phys_writeb(0xfe987,0xea); /* original IRQ1 location (Defender booter) */
phys_writed(0xfe988,RealGetVec(0x09));
if (machine==MCH_PCJR) PIC_AddEvent(RAMRefresh_Event,RAM_REFRESH_DELAY);
}
~BIOS(){