Message-Id: <3.0.32.19970526164326.0068bc78@mbnet.fi>
Date: Mon, 26 May 1997 16:43:29 +0300
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
From: Samuli =?iso-8859-1?Q?J=E4rvel=E4?= <samppa AT writeme DOT com>
Subject: Re: Re: FP_SEG and FP_OFF in DJGPP
Cc: djgpp AT delorie DOT com
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At 19:06 22.5.1997 +0300, you wrote:
>
>On 21 May 1997, Samuli Järvelä wrote:
>
>> The problem isn't converting it from Intel-syntax to AT&T-syntax, but the
>> offset and seg are. How can I get offset and segment values out from a
>> address?
>> I read the FAQ and it didn't help me at all.
>
>How so?  The FAQ explains this (not in assembly terms, but that's not
>your problem, as you say) in sections 18.1 and 18.2.  If something in
>those explanations is unclear, please ask specific questions.
>
I read those sections and I thought it would be the easiest way to
translate the procedure using ASM because I'm not so familiar with DJGPP,
but after all it might not be so.
I tried it with int86x like this:

  union REGS regs;
  regs.x.cx=CD_Drive;
  regs.x.bx=&RequestBlock;
  regs.x.ax=0x1510;
  int86x(0x2f,&regs,&regs);

When compiling it DJGPP prompted: "storage size of 'regs' isn't known".

I also tried it with _go32_info_block.linear_address_of_transfer_buffer,
but it goes beyond my comprehension. I tried it like this:

  __dpmi_regs r;
  r.x.cx=CD_Drive;
  r.x.bx = _go32_info_block.linear_address_of_transfer_buffer & 0x0f;
  r.x.ax = (_go32_info_block.linear_address_of_transfer_buffer >> 4)& 0xffff;
  r.x.es = r.x.ax;
  r.x.ax=0x1510;
  __dpmi_int(0x2f,&r);

But of course it won't work like this so I think I should copy the contents
of RequestBlock to this info block, but when trying to copy it with



memcpy(_go32_info_block.linear_address_of_transfer_buffer,&RequestBlock,size
of(RequestBlock))

it complains "warning: passing arg 1 of `memcpy' makes pointer from integer
without a cast".
Have I misunderstood something badly or what is the solution?

samppa AT writeme DOT com