void PMAPI PM_restorePMvect(int intno, PMFARPTR isr)
{
FARPTR ph;
FP_SET(ph,isr.off,isr.sel);
_dx_pmiv_set(intno,ph);
}
int PMAPI PM_unlockCodePages(void (*p)(),uint len,PM_lockHandle *lh)
{
CONFIG_INF config;
FARPTR fp;
_dx_config_inf(&config, (UCHAR*)&config);
FP_SET(fp,p,config.c_cs_sel);
return (_dx_ulock_pgs(fp,len) == 0);
}
void PMAPI PM_setPMvect(int intno, PM_intHandler isr)
{
CONFIG_INF config;
FARPTR ph;
PM_saveDS();
_dx_config_inf(&config, (UCHAR*)&config);
FP_SET(ph,(uint)isr,config.c_cs_sel);
_dx_pmiv_set(intno,ph);
}
static void setISR(int intno, void (PMAPI *isr)())
{
CONFIG_INF config;
FARPTR ph;
lockPMHandlers(); /* Ensure our handlers are locked */
_dx_config_inf(&config, (UCHAR*)&config);
FP_SET(ph,(uint)isr,config.c_cs_sel);
_dx_apmiv_set(intno,ph);
}
static REALPTR _dx_alloc_rmode_wrapper (pmodeHook pmHook,
rmodeHook rmHook,
int len, int stack_size,
ReturnType returnType)
{
#define DOFS 0x2C /* offset of data section (tiny model) */
#define DSIZE 16 /* sizeof data section at wrapper end */
#define WOFS (DOFS+DSIZE) /* offset of userWrapper code (optional) */
static unsigned char wrapper[] =
{
0x16, // 00 push ss
0x06, // 01 push es
0x1E, // 02 push ds
0x0E, // 03 push cs
0x1F, // 04 pop ds ;DS = CS
0xF8, // 05 clc
0xE8,0x33,0, // 06 call userWrapper ;33 relative (3A-8)
0x72,0x1C, // 09 jc short @exit
0x66,0x60, // 0B pushad
0x66,0xFF,0x36,DOFS+12,0, // 0D push taskId ;taskId to call
0x66,0x6A,0, // 12 push 0 ;use default selectors
0xFF,0x36,DOFS+4,0, // 15 push ourCS
0x66,0xFF,0x36,DOFS,0, // 19 push protGlue ;(*protGlue)()
0xFF,0x1E,DOFS+8,0, // 1E call rm2pmAddr
0x83,0xC4,14, // 22 add sp,14 ;discard used stack
0x66,0x61, // 25 popad
0x1F, // 27 @exit:pop ds
0x07, // 28 pop es
0x17, // 29 pop ss
0xCB, // 2A retf
0x90, // 2B nop
0,0,0,0, // +0 protGlue dd ?
0,0,0,0, // +4 ourCS dw ?,?
0,0,0,0, // +8 rm2pmAddr dd ?
0,0,0,0 // +12 taskId dd ?
}; // +16 userWrapper: ..
FARPTR pmCbuf, fpWrapper;
REALPTR rmCbuf, rm2pmAddr, dosReal;
USHORT para, paras, left;
ULONG cbufSize, i;
UINT *stack;
assert (sizeof(wrapper) == (DOFS+DSIZE));
if (!pmHook || numWrappers == MAX_WRAPPERS)
return (0);
_dx_rmlink_get (&rm2pmAddr,&rmCbuf,&cbufSize,&pmCbuf);
len += sizeof(wrapper);
paras = (len + 15) / 16;
para = 0;
if (_dx_real_above(paras,¶,&left))
{
ULONG temp;
if (_dx_cmem_usage(0,0,&temp,&temp))
return (0);
if (_dx_real_above(paras,¶,&left))
para = 0;
if (_dx_cmem_usage(0,1,&temp,&temp))
{
if (para)
_dx_real_free (para);
return (0);
}
if (!para)
return (0);
}
for (i = 0; i < MAX_WRAPPERS; i++)
if (!_rmcb[i].dosReal)
break;
*(ULONG*) (wrapper+DOFS+0) = (ULONG)&PmodeGlue; /* pmode helper */
*(ULONG*) (wrapper+DOFS+4) = My_CS(); /* pmode CS */
*(ULONG*) (wrapper+DOFS+8) = (ULONG)rm2pmAddr; /* rm->pm addr */
*(ULONG*) (wrapper+DOFS+12) = i; /* task Id */
wrapper [0x2A] = returnType; /* RETF or IRET */
/*
* lock pages used by callback (for 386|VMM, allthough untested)
*/
FP_SET (fpWrapper,para << 4, SS_DOSMEM);
_dx_lock_pgs (fpWrapper, len);
_dx_lock_pgsn ((void*)&PmodeGlue, (UINT)&PmGlueEnd - (UINT)&PmodeGlue);
RP_SET (dosReal,0,para);
FillRealMem (dosReal, 0, len);
WriteRealMem (dosReal, &wrapper, sizeof(wrapper));
if (rmHook)
WriteRealMem(dosReal+WOFS,(void*)rmHook,len-sizeof(wrapper));
else FillRealMem (dosReal+5,0x90,6);
stack_size += sizeof(UINT) + 3; /* add a DWORD for marker */
stack_size &= ~3; /* make number of DWORDs */
stack = malloc (stack_size);
if (!stack)
return (0);
_rmcb [i].dosReal = dosReal;
_rmcb [i].callback = pmHook;
_rmcb [i].stackStart = stack;
_rmcb [i].stackTop = stack + stack_size/sizeof(UINT) - 2;
_rmcb [i].stackTop[1] = MARKER;
_rmcb [i].marker = MARKER;
_dx_lock_pgsn ((void*)stack, stack_size);
#if 0
printf ("dosReal %08lX, rm2pmAddr %08lX, len %d, stack %08X\n",
dosReal,rm2pmAddr,len,stack);
#endif
numWrappers++;
return (dosReal);
}
