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/****************************************************************************
*
* SciTech OS Portability Manager Library
*
* ========================================================================
*
* The contents of this file are subject to the SciTech MGL Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.scitechsoft.com/mgl-license.txt
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
* The Initial Developer of the Original Code is SciTech Software, Inc.
* All Rights Reserved.
*
* ========================================================================
*
* Language: ANSI C
* Environment: any
*
* Description: Test program to check the ability to allocate real mode
* memory and to call real mode interrupt handlers such as
* the VESA VBE BIOS from protected mode. Compile and link
* with the appropriate command line for your DOS extender.
*
* Functions tested: PM_getVESABuf()
* PM_mapRealPointer()
* PM_int86x()
*
****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "pmapi.h"
/* SuperVGA information block */
#pragma pack(1)
typedef struct {
char VESASignature[4]; /* 'VESA' 4 byte signature */
short VESAVersion; /* VBE version number */
ulong OEMStringPtr; /* Far pointer to OEM string */
ulong Capabilities; /* Capabilities of video card */
ulong VideoModePtr; /* Far pointer to supported modes */
short TotalMemory; /* Number of 64kb memory blocks */
char reserved[236]; /* Pad to 256 byte block size */
} VgaInfoBlock;
#pragma pack()
int main(void)
{
RMREGS regs;
RMSREGS sregs;
VgaInfoBlock vgaInfo;
ushort *mode;
uint vgLen;
uchar *vgPtr;
unsigned r_vgseg,r_vgoff;
printf("Program running in ");
switch (PM_getModeType()) {
case PM_realMode:
printf("real mode.\n\n");
break;
case PM_286:
printf("16 bit protected mode.\n\n");
break;
case PM_386:
printf("32 bit protected mode.\n\n");
break;
}
/* Allocate a 256 byte block of real memory for communicating with
* the VESA BIOS.
*/
if ((vgPtr = PM_getVESABuf(&vgLen,&r_vgseg,&r_vgoff)) == NULL) {
printf("Unable to allocate VESA memory buffer!\n");
exit(1);
}
/* Call the VESA VBE to see if it is out there */
regs.x.ax = 0x4F00;
regs.x.di = r_vgoff;
sregs.es = r_vgseg;
memcpy(vgPtr,"VBE2",4);
PM_int86x(0x10, ®s, ®s, &sregs);
memcpy(&vgaInfo,vgPtr,sizeof(VgaInfoBlock));
if (regs.x.ax == 0x4F && strncmp(vgaInfo.VESASignature,"VESA",4) == 0) {
printf("VESA VBE version %d.%d BIOS detected\n\n",
vgaInfo.VESAVersion >> 8, vgaInfo.VESAVersion & 0xF);
printf("Available video modes:\n");
mode = PM_mapRealPointer(vgaInfo.VideoModePtr >> 16, vgaInfo.VideoModePtr & 0xFFFF);
while (*mode != 0xFFFF) {
printf(" %04hXh (%08X)\n", *mode, (int)mode);
mode++;
}
}
else
printf("VESA VBE not found\n");
return 0;
}
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