140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/* $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__ */
|
|
}
|