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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/bios_devmem.c,v 3.5 1998/09/13 00:51:32 dawes Exp $ */
/*
* Copyright 1993 by David Wexelblat <dwex@goblin.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of David Wexelblat not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. David Wexelblat makes no representations
* about the suitability of this software for any purpose. It is provided
* "as is" without express or implied warranty.
*
* DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL DAVID WEXELBLAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
*/
/* $XConsortium: bios_devmem.c /main/5 1996/10/19 18:07:41 kaleb $ */
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <X11/X.h>
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#include <string.h>
/*
* Read BIOS via /dev/mem.
*/
#ifndef DEV_MEM
# define DEV_MEM "/dev/mem"
#endif
_X_EXPORT int
xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
int Len)
{
int fd;
#ifdef __ia64__
if ((fd = open(DEV_MEM, O_RDONLY | O_SYNC)) < 0)
#else
if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
#endif
{
xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
DEV_MEM, strerror(errno));
return(-1);
}
if (lseek(fd, (Base+Offset), SEEK_SET) < 0)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: %s seek failed (%s)\n",
DEV_MEM, strerror(errno));
close(fd);
return(-1);
}
if (read(fd, Buf, Len) != Len)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: %s read failed (%s)\n",
DEV_MEM, strerror(errno));
close(fd);
return(-1);
}
close(fd);
return(Len);
}
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