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First CVS upload.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@80
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Sjoerd van der Berg 2002-07-27 13:08:48 +00:00
parent 7d1ca9bdd4
commit 42e5d0b779
158 changed files with 42940 additions and 0 deletions
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src/ints/ems.cpp Normal file
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/*
* Copyright (C) 2002 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "bios.h"
#include "keyboard.h"
#include "regs.h"
#include "inout.h"
#include "dos_inc.h"
#define PAGEFRAME_SEG 0xe000
class device_EMS : public DOS_Device {
public:
device_EMS();
bool Read(Bit8u * data,Bit16u * size);
bool Write(Bit8u * data,Bit16u * size);
bool Seek(Bit32u * pos,Bit32u type);
bool Close();
Bit16u GetInformation(void);
private:
Bit8u cache;
};
bool device_EMS::Read(Bit8u * data,Bit16u * size) {
return false;
}
bool device_EMS::Write(Bit8u * data,Bit16u * size) {
return false;
}
bool device_EMS::Seek(Bit32u * pos,Bit32u type) {
return false;
}
bool device_EMS::Close() {
return false;
}
Bit16u device_EMS::GetInformation(void) {
return 0x8093;
};
device_EMS::device_EMS() {
name="EMMXXXX0";
}
PageEntry ems_entries[4];
Bitu call_int67;
static Bitu INT67_Handler(void) {
switch (reg_ah) {
case 0x40: /* Get Status */
reg_ah=0; //Status ok :)
break;
case 0x41: /* Get PageFrame Segment */
reg_bx=PAGEFRAME_SEG;
reg_ah=0;
break;
case 0x42: /* Get number of pages */
{
//HEHE Hope this works not exactly like the specs but who cares
Bit16u maxfree,total;
EMM_GetFree(&maxfree,&total);
reg_dx=maxfree>>2;
reg_bx=total>>2;
reg_ah=0;
};
break;
case 0x43: /* Get Handle and Allocate Pages */
{
if (!reg_bx) { reg_ah=0x89;break; }
Bit16u handle;
EMM_Allocate(reg_bx*4,&handle);
if (handle) {
reg_ah=0;
reg_dx=handle;
} else { reg_ah=0x88; }
break;
}
case 0x44: /* Map Memory */
{
if (reg_al>3) { reg_ah=0x8b;break; }
HostPt pagestart=memory+EMM_Handles[reg_dx].phys_base+reg_bx*16*1024;
ems_entries[reg_al].relocate=pagestart;
reg_ah=0;
break;
}
case 0x45: /* Release handle and free pages */
EMM_Free(reg_dx);
reg_ah=0;
break;
case 0x46: /* Get EMM Version */
reg_ah=0;
reg_al=0x32; //Only 3.2 support for now
break;
case 0x47: /* Save Mapping Context */
LOG_ERROR("EMS:47:Save Mapping Context not supported");
reg_ah=0x8c;
break;
case 0xDE: /* VCPI Functions */
LOG_ERROR("VCPI Functions not supported");
reg_ah=0x8c;
break;
default:
LOG_ERROR("EMS:Call %2X not supported",reg_ah);
reg_ah=0x8c;
break;
}
return CBRET_NONE;
}
void EMS_Init(void) {
call_int67=CALLBACK_Allocate();
CALLBACK_Setup(call_int67,&INT67_Handler,CB_IRET);
/* Register the ems device */
DOS_Device * newdev = new device_EMS();
DOS_AddDevice(newdev);
/* Setup the page handlers for the page frame */
for (Bitu i=0;i<4;i++) {
ems_entries[i].base=(PAGEFRAME_SEG<<4)+i*16*1024;
ems_entries[i].type=MEMORY_RELOCATE;
ems_entries[i].relocate=memory+(PAGEFRAME_SEG<<4)+i*16*1024;
/* Place the page handlers in the ems page fram piece of the memory handler*/
MEMORY_SetupHandler(((PAGEFRAME_SEG<<4)+i*16*1024)>>12,4,&ems_entries[i]);
}
/* Add a little hack so it appears that there is an actual ems device installed */
char * emsname="EMMXXXX0";
Bit16u seg=DOS_GetMemory(2); //We have 32 bytes
MEM_BlockWrite(real_phys(seg,0xa),emsname,strlen(emsname)+1);
/* Copy the callback piece into the beginning */
char buf[16];
MEM_BlockRead(real_phys(CB_SEG,call_int67<<4),buf,0xa);
MEM_BlockWrite(real_phys(seg,0),buf,0xa);
RealSetVec(0x67,RealMake(seg,0));
}