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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/bios_mmap.c,v 1.9 2001/05/23 14:46:05 alanh 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_V4mmap.c /main/4 1996/02/21 17:54:27 kaleb $ */
#include "X.h"
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif
/*
* Read BIOS via mmap()ing DEV_MEM
*/
#ifndef __alpha__
int
xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
int Len)
{
int fd;
unsigned char *ptr;
int psize;
int mlen;
if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
DEV_MEM, strerror(errno));
return(-1);
}
psize = xf86getpagesize();
Offset += Base & (psize - 1);
Base &= ~(psize - 1);
mlen = (Offset + Len + psize - 1) & ~(psize - 1);
ptr = (unsigned char *)mmap((caddr_t)0, mlen, PROT_READ,
MAP_SHARED, fd, (off_t)Base);
if (ptr == MAP_FAILED)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: %s mmap failed (%s)\n",
DEV_MEM, strerror(errno));
close(fd);
return(-1);
}
#ifdef DEBUG
ErrorF("xf86ReadBIOS: BIOS at 0x%08x has signature 0x%04x\n",
Base, ptr[0] | (ptr[1] << 8));
#endif
(void)memcpy(Buf, (void *)(ptr + Offset), Len);
(void)munmap((caddr_t)ptr, mlen);
(void)close(fd);
return(Len);
}
#else /* __alpha__ */
/*
* 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 linux
#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)
#else
extern u_int64_t dense_base(void);
#define BUS_BASE dense_base()
#define JENSEN_SHIFT(x) ((long) x)
#endif
int
xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
int Len)
{
caddr_t base;
int fd;
int psize;
int mlen;
if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
DEV_MEM, strerror(errno));
return(-1);
}
psize = xf86getpagesize();
Offset += Base & (psize - 1);
Base &= ~(psize - 1);
mlen = (Offset + Len + psize - 1) & ~(psize - 1);
base = mmap((caddr_t)0, JENSEN_SHIFT(mlen), PROT_READ,
MAP_SHARED, fd, (off_t)(JENSEN_SHIFT(Base) + BUS_BASE));
if (base == MAP_FAILED)
{
xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to mmap %s (%s)\n",
DEV_MEM, strerror(errno));
return(-1);
}
xf86SlowBCopyFromBus((unsigned char *)(base+JENSEN_SHIFT(Offset)),
Buf, Len);
munmap((caddr_t)JENSEN_SHIFT(base), JENSEN_SHIFT(mlen));
close(fd);
return(Len);
}
#endif /* __alpha__ */
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