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