Date: Wed, 30 Aug 2000 08:28:48 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Gary Slaughenhaupt <gary DOT slaughenhaupt AT ia DOT nsc DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: Newbie stuck.
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On Tue, 29 Aug 2000, Gary Slaughenhaupt wrote:

> int ShowXpressRomInfo()
> {
>     unsigned char * pBIOSTable = (unsigned char *)0xF0000000L;
>     unsigned char xpressStart[12]=
> {'X','p','r','e','s','s','S','t','a','r','t',0};
>     unsigned char xpressInfo[250];
>     int x = 0;
> 
>     // Get BIOS Info Table
>     do
>     {
>         if (memcmp((unsigned char *) &xpressStart,\
>                      pBIOSTable,\
>                     strlen((unsigned char *) &xpressStart))== 0)
>         {
>             pBIOSTable+=12;
>             break;
>         } else pBIOSTable++;
>     } while (pBIOSTable <= (unsigned char *) 0xF000FFF3L);
> 
>     But I get a segment violation when attempting to do the memcmp.

You cannot use this to access conventional memory from a
protected-mode program.  You need to rewrite this code.  One
possibility is to use dosmemget library function to copy the entire
block between 0xF0000000L and 0xF000FFF3L to a normal char array, then
use memcmp as usual.