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- fix int15 function e801 (get memory size)

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Christophe Bothamy 2003-04-25 22:13:24 +00:00
parent ce9893f540
commit d112043348
1 changed files with 25 additions and 16 deletions
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41
bochs/bios/rombios.c
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: rombios.c,v 1.92 2003-03-08 22:59:17 cbothamy Exp $
// $Id: rombios.c,v 1.93 2003-04-25 22:13:24 cbothamy Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -928,10 +928,10 @@ Bit16u cdrom_boot();
#endif // BX_ELTORITO_BOOT
static char bios_cvs_version_string[] = "$Revision: 1.92 $";
static char bios_date_string[] = "$Date: 2003-03-08 22:59:17 $";
static char bios_cvs_version_string[] = "$Revision: 1.93 $";
static char bios_date_string[] = "$Date: 2003-04-25 22:13:24 $";
static char CVSID[] = "$Id: rombios.c,v 1.92 2003-03-08 22:59:17 cbothamy Exp $";
static char CVSID[] = "$Id: rombios.c,v 1.93 2003-04-25 22:13:24 cbothamy Exp $";
/* Offset to skip the CVS $Id: prefix */
#define bios_version_string (CVSID + 4)
@ -3879,20 +3879,29 @@ BX_DEBUG_INT15("case default:\n");
}
break;
case 0x01: // coded by Hartmut Birr
regs.u.r8.al = inb_cmos(0x34);
regs.u.r8.ah = inb_cmos(0x35);
if(regs.u.r16.ax)
case 0x01:
// do we have any reason to fail here ?
CLEAR_CF();
// my real system sets ax and bx to 0
// this is confirmed by Ralph Brown list
regs.u.r16.ax = 0;
regs.u.r16.bx = 0;
// Get the amount of extended memory (above 1M)
regs.u.r8.cl = inb_cmos(0x30);
regs.u.r8.ch = inb_cmos(0x31);
// limit to 15M
if(regs.u.r16.cx > 0x3c00)
{
regs.u.r16.bx = regs.u.r16.ax;
regs.u.r16.ax = 0x3c00;
regs.u.r16.cx = regs.u.r16.ax;
regs.u.r16.dx = regs.u.r16.bx;
CLEAR_CF();
break;
regs.u.r16.cx = 0x3c00;
}
regs.u.r8.ah = 0xe8;
regs.u.r8.al = 0x01;
// Get the amount of extended memory above 16M in 64k blocs
regs.u.r8.dl = inb_cmos(0x34);
regs.u.r8.dh = inb_cmos(0x35);
break;
default: /* AH=0xE8?? but not implemented */
goto int15_unimplemented;