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Some changes to make the driver conform the specs more closely

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1708
This commit is contained in:
Peter Veenstra 2004-03-09 20:13:44 +00:00
parent 8d674ffdf8
commit e9d22fa895
1 changed files with 16 additions and 4 deletions
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20
src/ints/xms.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: xms.cpp,v 1.31 2004-01-14 20:54:41 finsterr Exp $ */
/* $Id: xms.cpp,v 1.32 2004-03-09 20:13:44 qbix79 Exp $ */
#include <stdlib.h>
#include <string.h>
@ -128,7 +128,7 @@ Bitu XMS_AllocateMemory(Bitu size, Bit16u& handle)
}
Bitu pages=(size/4) + ((size & 3) ? 1 : 0);
MemHandle mem=MEM_AllocatePages(pages,true);
if (!mem) return XMS_OUT_OF_SPACE;
if ((!mem) && (size != 0)) return XMS_OUT_OF_SPACE;
xms_handles[index].free=false;
xms_handles[index].mem=mem;
xms_handles[index].locked=0;
@ -305,11 +305,11 @@ Bitu XMS_Handler(void) {
case XMS_LOCK_EXTENDED_MEMORY_BLOCK: { /* 0c */
Bit32u address;
reg_bl = XMS_LockMemory(reg_dx, address);
reg_ax = (reg_bl==0);
if (reg_bl==0) { // success
reg_bx=(Bit16u)(address & 0xFFFF);
reg_dx=(Bit16u)(address >> 16);
};
reg_ax = (reg_bl==0);
}; break;
case XMS_UNLOCK_EXTENDED_MEMORY_BLOCK: /* 0d */
reg_bl = XMS_UnlockMemory(reg_dx);
@ -350,8 +350,20 @@ void XMS_Init(Section* sec) {
BIOS_ZeroExtendedSize();
DOS_AddMultiplexHandler(multiplex_xms);
call_xms=CALLBACK_Allocate();
CALLBACK_Setup(call_xms,&XMS_Handler,CB_RETF);
CALLBACK_Setup(call_xms,&XMS_Handler,CB_RETF, "XMS Handler");
xms_callback=CALLBACK_RealPointer(call_xms);
/* Overide the callback with one that can be hooked */
phys_writeb(CB_BASE+(call_xms<<4)+0,(Bit8u)0xeb); //jump near
phys_writeb(CB_BASE+(call_xms<<4)+1,(Bit8u)0x03); //offset
phys_writeb(CB_BASE+(call_xms<<4)+2,(Bit8u)0x90); //NOP
phys_writeb(CB_BASE+(call_xms<<4)+3,(Bit8u)0x90); //NOP
phys_writeb(CB_BASE+(call_xms<<4)+4,(Bit8u)0x90); //NOP
phys_writeb(CB_BASE+(call_xms<<4)+5,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(call_xms<<4)+6,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(call_xms<<4)+7,call_xms); //The immediate word
phys_writeb(CB_BASE+(call_xms<<4)+9,(Bit8u)0xCB); //A RETF Instruction
for (i=0;i<XMS_HANDLES;i++) {
xms_handles[i].free=true;
xms_handles[i].mem=-1;