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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/bios_devmem.c,v 3.3 1996/12/23 06:50:58 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.
*
*/
/* $Xorg: bios_devmem.c,v 1.3 2000/08/17 19:51:30 cpqbld Exp $ */
#include "X.h"
#include "input.h"
#include "scrnintstr.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
int xf86ReadBIOS(Base, Offset, Buf, Len)
unsigned long Base;
unsigned long Offset;
unsigned char *Buf;
int Len;
{
#ifdef __alpha__
/*
* The Alpha version uses "mmap" instead of "lseek/read",
* because these (currently) don't work for BUS memory.
* We trick "mmap" into mapping BUS memory for us via BUS_BASE,
* which is the KSEG address of the start of the DENSE memory
* area.
*/
/*
* NOTE: there prolly ought to be more validity checks and all
* re: boundaries and sizes and such...
*/
/*
* The Jensen lacks dense memory, thus we have to address the bus via
* the sparse addressing scheme.
*
* Martin Ostermann (ost@comnets.rwth-aachen.de) - Apr.-Sep. 1996
*/
#ifdef TEST_JENSEN_CODE /* define to test the Sparse addressing on a non-Jensen */
#define SPARSE (5)
#define isJensen (1)
#else
#define isJensen (!_bus_base())
#define SPARSE (7)
#endif
extern unsigned long _bus_base(void);
extern unsigned long _bus_base_sparse(void);
#define BUS_BASE (isJensen ? _bus_base_sparse() : _bus_base())
#define JENSEN_SHIFT(x) (isJensen ? ((long)x<<SPARSE) : (long)x)
#define SIZE (64*1024)
caddr_t base;
int fd;
if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
{
ErrorF("xf86ReadBios: Failed to open %s (%s)\n", DEV_MEM,
strerror(errno));
return(-1);
}
base = mmap((caddr_t)0, JENSEN_SHIFT(SIZE), PROT_READ,
MAP_SHARED, fd, (off_t)(JENSEN_SHIFT(Base) + BUS_BASE));
if (base == (caddr_t)-1UL)
{
ErrorF("xf86ReadBios: Failed to mmap %s (%s)\n", DEV_MEM,
strerror(errno));
return(-1);
}
SlowBCopyFromBus(base+JENSEN_SHIFT(Offset), Buf, Len);
munmap((caddr_t)JENSEN_SHIFT(base), JENSEN_SHIFT(SIZE));
close(fd);
return(Len);
#else /* __alpha__ */
int fd;
if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
{
ErrorF("xf86ReadBios: Failed to open %s (%s)\n", DEV_MEM,
strerror(errno));
return(-1);
}
if (lseek(fd, (Base+Offset), SEEK_SET) < 0)
{
ErrorF("xf86ReadBios: %s seek failed (%s)\n", DEV_MEM,
strerror(errno));
close(fd);
return(-1);
}
if (read(fd, Buf, Len) != Len)
{
ErrorF("xf86ReadBios: %s read failed (%s)\n", DEV_MEM,
strerror(errno));
close(fd);
return(-1);
}
close(fd);
return(Len);
#endif /* __alpha__ */
}
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