128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include "miscemu.h"
|
|
#include "stddebug.h"
|
|
/* #define DEBUG_INT */
|
|
#include "debug.h"
|
|
|
|
struct Win87EmInfoStruct
|
|
{
|
|
unsigned short Version;
|
|
unsigned short SizeSaveArea;
|
|
unsigned short WinDataSeg;
|
|
unsigned short WinCodeSeg;
|
|
unsigned short Have80x87;
|
|
unsigned short Unused;
|
|
};
|
|
|
|
/* Implementing this is easy cause Linux and *BSD* ALWAYS have a numerical
|
|
* coprocessor. (either real or emulated on kernellevel)
|
|
*/
|
|
/* win87em.dll also sets interrupt vectors: 2 (NMI), 0x34 - 0x3f (emulator
|
|
* calls of standard libraries, see Ralph Browns interrupt list), 0x75
|
|
* (int13 error reporting of coprocessor)
|
|
*/
|
|
|
|
/* have a look at /usr/src/linux/arch/i386/math-emu/ *.[ch] for more info
|
|
* especially control_w.h and status_w.h
|
|
*/
|
|
/* FIXME: Only skeletal implementation for now */
|
|
|
|
void WINAPI WIN87_fpmath( CONTEXT *context )
|
|
{
|
|
dprintf_int(stddeb, "_fpmath: (cs:eip=%x:%lx es=%x bx=%04x ax=%04x dx==%04x)\n",
|
|
(WORD)CS_reg(context), EIP_reg(context),
|
|
(WORD)ES_reg(context), BX_reg(context),
|
|
AX_reg(context), DX_reg(context) );
|
|
|
|
switch(BX_reg(context))
|
|
{
|
|
case 0: /* install (increase instanceref) emulator, install NMI vector */
|
|
AX_reg(context) = 0;
|
|
break;
|
|
|
|
case 1: /* Init Emulator */
|
|
AX_reg(context) = 0;
|
|
break;
|
|
|
|
case 2: /* deinstall emulator (decrease instanceref), deinstall NMI vector
|
|
* if zero. Every '0' call should have a matching '2' call.
|
|
*/
|
|
AX_reg(context) = 0;
|
|
break;
|
|
|
|
case 3:
|
|
/*INT_SetHandler(0x3E,MAKELONG(AX,DX));*/
|
|
break;
|
|
|
|
case 4: /* set control word (& ~(CW_Denormal|CW_Invalid)) */
|
|
/* OUT: newset control word in AX */
|
|
break;
|
|
|
|
case 5: /* return internal control word in AX */
|
|
break;
|
|
|
|
case 6: /* round top of stack to integer using method AX & 0x0C00 */
|
|
/* returns current controlword */
|
|
break;
|
|
|
|
case 7: /* POP top of stack as integer into DX:AX */
|
|
/* IN: AX&0x0C00 rounding protocol */
|
|
/* OUT: DX:AX variable popped */
|
|
{
|
|
DWORD dw=0;
|
|
/* I don't know much about asm() programming. This could be
|
|
* wrong.
|
|
*/
|
|
/* FIXME: could someone who really understands asm() fix this please? --AJ */
|
|
/* __asm__("fistp %0;wait" : "=m" (dw) : : "memory"); */
|
|
dprintf_int(stddeb,"emulate.c:On top of stack was %ld\n",dw);
|
|
AX_reg(context) = LOWORD(dw);
|
|
DX_reg(context) = HIWORD(dw);
|
|
}
|
|
break;
|
|
|
|
case 8: /* restore internal control words from emulator control word */
|
|
break;
|
|
|
|
case 9: /* clear emu control word and some other things */
|
|
break;
|
|
|
|
case 10: /* dunno. but looks like returning nr. of things on stack in AX */
|
|
AX_reg(context) = 0;
|
|
break;
|
|
|
|
case 11: /* just returns the installed flag in DX:AX */
|
|
DX_reg(context) = 0;
|
|
AX_reg(context) = 1;
|
|
break;
|
|
|
|
case 12: /* save AX in some internal state var */
|
|
break;
|
|
|
|
default: /* error. Say that loud and clear */
|
|
AX_reg(context) = DX_reg(context) = 0xFFFF;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
void WINAPI WIN87_WinEm87Info(struct Win87EmInfoStruct *pWIS,
|
|
int cbWin87EmInfoStruct)
|
|
{
|
|
dprintf_int(stddeb, "__WinEm87Info(%p,%d)\n",pWIS,cbWin87EmInfoStruct);
|
|
}
|
|
|
|
void WINAPI WIN87_WinEm87Restore(void *pWin87EmSaveArea,
|
|
int cbWin87EmSaveArea)
|
|
{
|
|
dprintf_int(stddeb, "__WinEm87Restore(%p,%d)\n",
|
|
pWin87EmSaveArea,cbWin87EmSaveArea);
|
|
}
|
|
|
|
void WINAPI WIN87_WinEm87Save(void *pWin87EmSaveArea, int cbWin87EmSaveArea)
|
|
{
|
|
dprintf_int(stddeb, "__WinEm87Save(%p,%d)\n",
|
|
pWin87EmSaveArea,cbWin87EmSaveArea);
|
|
}
|