int installCallback(void (PMAPI *pmCB)(),uint *psel, uint *poff,
uint *rseg, uint *roff)
{
PMREGS regs;
PMSREGS sregs;
regs.x.ax = 0x250D;
PM_segread(&sregs);
PM_int386x(0x21,®s,®s,&sregs); /* Get RM callback address */
/* Fill in the values in the real mode code segment so that it will
* call the correct routine.
*/
*((ulong*)&realHandler[0]) = regs.e.eax;
*((ushort*)&realHandler[4]) = sregs.cs;
*((ulong*)&realHandler[6]) = (ulong)pmCB;
/* Copy the real mode handler to real mode memory (only allocate the
* buffer once since we cant dealloate it with X32).
*/
if (*psel == 0) {
if (!PM_allocRealSeg(sizeof(realHandler),psel,poff,rseg,roff))
return 0;
}
PM_memcpyfn(*psel,*poff,realHandler,sizeof(realHandler));
/* Skip past global variables in real mode code segment */
*roff += 0x0A;
return 1;
}
uchar * installCallback(void (PMAPI *pmCB)(),uint *rseg, uint *roff)
{
CONFIG_INF config;
REALPTR realBufAdr,callProtp;
ULONG bufSize;
FARPTR protBufAdr;
uchar *p;
/* Get address of real mode routine to call up to protected mode */
_dx_rmlink_get(&callProtp, &realBufAdr, &bufSize, &protBufAdr);
_dx_config_inf(&config, (UCHAR*)&config);
/* Fill in the values in the real mode code segment so that it will
* call the correct routine.
*/
*((REALPTR*)&realHandler[0]) = callProtp;
*((USHORT*)&realHandler[4]) = config.c_cs_sel;
*((ULONG*)&realHandler[6]) = (ULONG)pmCB;
/* Copy the real mode handler to real mode memory */
if ((p = PM_allocRealSeg(sizeof(realHandler),rseg,roff)) == NULL)
return NULL;
memcpy(p,realHandler,sizeof(realHandler));
/* Skip past global variabls in real mode code segment */
*roff += 0x0A;
return p;
}
int PMAPI PM_setMouseHandler(int mask, PM_mouseHandler mh)
{
RMREGS regs;
RMSREGS sregs;
uint rseg,roff;
lockPMHandlers(); /* Ensure our handlers are locked */
/* Copy the real mode handler to real mode memory */
if ((mousePtr = PM_allocRealSeg(sizeof(mouseHandler),&rseg,&roff)) == NULL)
return 0;
memcpy(mousePtr,mouseHandler,sizeof(mouseHandler));
if (!_DPMI_allocateCallback(_PM_mousePMCB, mouseRegs, &mouseRMCB))
PM_fatalError("Unable to allocate real mode callback!\n");
PM_setLong(mousePtr,mouseRMCB);
/* Install the real mode mouse handler */
_PM_mouseHandler = mh;
sregs.es = rseg;
regs.x.dx = roff+4;
regs.x.cx = _PM_mouseMask = mask;
regs.x.ax = 0xC;
PM_int86x(0x33, ®s, ®s, &sregs);
return 1;
}
void * PMAPI PM_getVESABuf(uint *len,uint *rseg,uint *roff)
{
if (!VESABuf_ptr) {
/* Allocate a global buffer for communicating with the VESA VBE */
if ((VESABuf_ptr = PM_allocRealSeg(VESABuf_len, &VESABuf_rseg, &VESABuf_roff)) == NULL)
return NULL;
atexit(ExitVBEBuf);
}
*len = VESABuf_len;
*rseg = VESABuf_rseg;
*roff = VESABuf_roff;
return VESABuf_ptr;
}
/****************************************************************************
REMARKS:
Allocate the real mode VESA transfer buffer for communicating with the BIOS.
****************************************************************************/
void * PMAPI PM_getVESABuf(
uint *len,
uint *rseg,
uint *roff)
{
// TODO: If you do not have BIOS access, simply delete the guts of
// this function and return NULL.
if (!VESABuf_ptr) {
/* Allocate a global buffer for communicating with the VESA VBE */
if ((VESABuf_ptr = PM_allocRealSeg(VESABuf_len, &VESABuf_rseg, &VESABuf_roff)) == NULL)
return NULL;
atexit(ExitVBEBuf);
}
*len = VESABuf_len;
*rseg = VESABuf_rseg;
*roff = VESABuf_roff;
return VESABuf_ptr;
}