Date: Thu, 2 Feb 1995 15:37:28 +0500
From: ld AT netrix DOT com
To: DJGPP AT sun DOT soe DOT clarkson DOT edu, CZIWKGA AT vmsfe DOT ulcc DOT ac DOT uk
Subject: Re: Request for advice with djgpp, ASPI manager and them _go32_dpmi* 
         functions


> From djgpp-bounces AT sun DOT soe DOT clarkson DOT edu Thu Feb  2 12:30 EST 1995
> Date: Thu, 2 Feb 95 11:18 GMT
> From: "Kevin Ashley, Systems Development, ULCC" <CZIWKGA AT vmsfe DOT ulcc DOT ac DOT uk>
> To: DJGPP <DJGPP AT sun DOT soe DOT clarkson DOT edu>
> Subject: Request for advice with djgpp, ASPI manager and them _go32_dpmi* 
>          functions
> 

My comments begin with +++:

> I'm hoping someone can shed some advice which might get me started and then
> hopefully I can make more progress on my own.
 
[A lot of code snipped.]

> *************
> void ( *aspi)(void  *) = (void  *) 0;
> 
> void aspiinit()
> {
>   int h,i;
>   long l;
> #ifdef __GO32__
> #include <dpmi.h>
> _go32_dpmi_registers inregs;
> _go32_dpmi_seginfo dosmem1,dosmem2;
> #else
>   union REGS inregs;
>   union REGS outregs;
> #endif
>  char *getenv(), *tapeid;
> 
>   if ( (h=open("SCSIMGR$",0)) == -1 )  {
>     perror("Opening ASPI Manager");
>     exit(1);
>   }
> 
> /*
>  * This is an ioctl(READ) to the "SCSIMGR$".
>  * It returns the entrypoint of the aspi-module (far pointer)
>  * in the 4 bytes, pointed to by the dx register.
>  */
> 
>   inregs.x.ax = 0x4402;
>   inregs.x.cx = 4;
>   inregs.x.bx = h;
> #ifdef __GO32__
>   dosmem1.size = 1;

+++ dosmem1.size = (sizeof (aspi) + 15) / 16;

>   inregs.x.ss = inregs.x.sp = inregs.x.flags = 0;
>   if(_go32_dpmi_allocate_dos_memory(&dosmem1)) {  
> 	printf("Unable to allocate DOS memory\n");
> 	exit(1);
>   }
>   printf("Alloc DOS mem returns RS: %x RO: %x size: %d\n",
> 	dosmem1.rm_segment,dosmem1.rm_offset,dosmem1.size);
>   inregs.x.dx = dosmem1.rm_segment*16;

+++ inregs.x.dx = dosmem1.rm_offset;
+++ inregs.x.ds = dosmem1.rm_segment;

>   i = dosmem1.rm_segment*16;
>   
>   dosmemget(dosmem1.rm_segment*16,sizeof(int),&aspi);

+++ dosmemget(dosmem1.rm_segment*16 + dosmem1.rm-offset, ...);

>   printf("Aspi entry before int is %x\n",(int) aspi);
>   i = _go32_dpmi_simulate_int(0x21,&inregs);
>   printf("File was %d, int returns %d\n",h,i);
>   dosmemget(dosmem1.rm_segment*16,sizeof(int),&aspi);

+++ dosmemget(dosmem1.rm_segment*16 + rm_offset, ...)

>   _go32_dpmi_free_dos_memory(&dosmem1);
>   printf("Aspi entry is %x\n",(int) aspi);
>   exit(1);
> **********

Hope that helps,
Long.