From:	Clemens Valens <c DOT valens AT mindless DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Q: rebooting PC
Organization:	http://www.remarq.com: The World's Usenet/Discussions Start Here
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Message-ID:	<929439363.23288@www.remarq.com>
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Date:	Tue, 15 Jun 1999 01:36:02 -0800
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I am porting a program from BC 3.1 to DJGPP and am
experiencing some problems. My program runs on an embedded
system, not easily accesible. It is reconfigurable from
another machine and therefore I have to reboot it sometimes
completely. For this I used the function below, which
worked very well. However I don't know how to port it to
DJGPP and I don't even know if it is possible this way. How
can I reboot a PC with a program compiled with DJGPP?

/*
 * Force a jump to fff0:f000, the PC reset vector.
 */
void reboot(void)
{
  asm {
    mov ax,0xf000
    push ax
    mov ax,0xfff0
    push ax
    retf
  }
}

Ported to DJGPP this becomes:

void reboot(void)
{
  asm ("movw $0xf000,%ax; pushw %ax; movw $0xfff0,%ax;
pushw %ax; ret;");
}

I tried this because you never know. Not unexpectedly this
does not work, and it GP faults with something like SIGSEGV
blah blah. I tried to change it to 32-bit but the result
remained the same, a GP fault.

So my question is: how can I do this in DJGPP, if at all?

Clemens



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