/****************************************************************************
REMARKS:
Determines if we have a mouse attached and functioning.
****************************************************************************/
static ibool detectMouse(void)
{
RMREGS regs;
RMSREGS sregs;
uchar *p;
ibool retval;
regs.x.ax = 0x3533; /* Get interrupt vector 0x33 */
PM_int86x(0x21,®s,®s,&sregs);
/* Check that interrupt vector 0x33 is not a zero, and that the first
* instruction in the interrupt vector is not an IRET instruction
*/
p = PM_mapRealPointer(sregs.es, regs.x.bx);
retval = (sregs.es != 0) && (regs.x.bx != 0) && (PM_getByte(p) != 207);
return retval;
}
static void InitPMCode(void)
/****************************************************************************
*
* Function: InitPMCode - 32 bit protected mode version
*
* Description: Finds the address of and relocates the protected mode
* code block from the VBE 2.0 into a local memory block. The
* memory block is allocated with malloc() and must be freed
* with VBE_freePMCode() after graphics processing is complete.
*
* Note that this buffer _must_ be recopied after each mode set,
* as the routines will change depending on the underlying
* video mode.
*
****************************************************************************/
{
RMREGS regs;
RMSREGS sregs;
uchar *code;
int pmLen;
if (!state->pmInfo && state->VBEVersion >= 0x200) {
regs.x.ax = 0x4F0A;
regs.x.bx = 0;
PM_int86x(0x10,®s,®s,&sregs);
if (regs.x.ax != VBE_SUCCESS)
return;
if (VBE_shared)
state->pmInfo = PM_mallocShared(regs.x.cx);
else
state->pmInfo = PM_malloc(regs.x.cx);
if (state->pmInfo == NULL)
return;
state->pmInfo32 = state->pmInfo;
pmLen = regs.x.cx;
/* Relocate the block into our local data segment */
code = PM_mapRealPointer(sregs.es,regs.x.di);
memcpy(state->pmInfo,code,pmLen);
/* Now do a sanity check on the information we recieve to ensure
* that is is correct. Some BIOS return totally bogus information
* in here (Matrox is one)! Under DOS this works OK, but under OS/2
* we are screwed.
*/
if (state->pmInfo->setWindow >= pmLen ||
state->pmInfo->setDisplayStart >= pmLen ||
state->pmInfo->setPalette >= pmLen ||
state->pmInfo->IOPrivInfo >= pmLen) {
if (VBE_shared)
PM_freeShared(state->pmInfo);
else
PM_free(state->pmInfo);
state->pmInfo32 = state->pmInfo = NULL;
return;
}
/* Read the IO priveledge info and determine if we need to
* pass a selector to MMIO registers to the bank switch code.
* Since we no longer support selector allocation, we no longer
* support this mechanism so we disable the protected mode
* interface in this case.
*/
if (state->pmInfo->IOPrivInfo && !state->MMIOSel) {
ushort *p = (ushort*)((uchar*)state->pmInfo + state->pmInfo->IOPrivInfo);
while (*p != 0xFFFF)
p++;
p++;
if (*p != 0xFFFF)
VBE_freePMCode();
}
}
}
void * PMAPI PM_getBIOSPointer(void)
{
return PM_mapRealPointer(0, 0x400);
}
/****************************************************************************
REMARKS:
Return a pointer to the real mode BIOS data area.
****************************************************************************/
void * PMAPI PM_getBIOSPointer(void)
{
// Note that on NT this probably does not do what we expect!
return PM_mapRealPointer(0x40, 0);
}
