int main(void)
{
RMREGS regs;
RMSREGS sregs;
VgaInfoBlock vgaInfo;
ushort *mode;
uint vgLen;
uchar *vgPtr;
unsigned r_vgseg,r_vgoff;
/* 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++;
}
}
void VBEAPI VBE_init(void)
/****************************************************************************
*
* Function: VBE_init
*
* Description: Initialises the VBE transfer buffer in real mode DC.memory.
* This routine is called by the VESAVBE module every time
* it needs to use the transfer buffer, so we simply allocate
* it once and then return.
*
****************************************************************************/
{
if (!state->VESABuf_ptr) {
/* Allocate a global buffer for communicating with the VESA VBE */
if ((state->VESABuf_ptr = PM_getVESABuf(&VESABuf_len, &state->VESABuf_rseg, &state->VESABuf_roff)) == NULL)
PM_fatalError("VESAVBE.C: Real mode memory allocation failed!");
}
}
