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initialize a few fixed-position bios interrupt locations

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(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
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11
src/dos/dos_programs.cpp
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@ -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;