163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/*
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* Copyright 1993 by David Wexelblat <dwex@goblin.org>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of David Wexelblat not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. David Wexelblat makes no representations
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* about the suitability of this software for any purpose. It is provided
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* "as is" without express or implied warranty.
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*
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* DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL DAVID WEXELBLAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <X11/X.h>
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *)-1)
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#endif
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/*
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* Read BIOS via mmap()ing DEV_MEM
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*/
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#ifndef __alpha__
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_X_EXPORT int
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xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
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int Len)
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{
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int fd;
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unsigned char *ptr;
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int psize;
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int mlen;
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if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
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{
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xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
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DEV_MEM, strerror(errno));
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return(-1);
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}
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psize = getpagesize();
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Offset += Base & (psize - 1);
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Base &= ~(psize - 1);
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mlen = (Offset + Len + psize - 1) & ~(psize - 1);
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ptr = (unsigned char *)mmap((caddr_t)0, mlen, PROT_READ,
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MAP_SHARED, fd, (off_t)Base);
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if (ptr == MAP_FAILED)
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{
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xf86Msg(X_WARNING, "xf86ReadBIOS: %s mmap failed (%s)\n",
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DEV_MEM, strerror(errno));
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close(fd);
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return(-1);
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}
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#ifdef DEBUG
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ErrorF("xf86ReadBIOS: BIOS at 0x%08x has signature 0x%04x\n",
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Base, ptr[0] | (ptr[1] << 8));
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#endif
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(void)memcpy(Buf, (void *)(ptr + Offset), Len);
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(void)munmap((caddr_t)ptr, mlen);
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(void)close(fd);
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return(Len);
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}
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#else /* __alpha__ */
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/*
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* We trick "mmap" into mapping BUS memory for us via BUS_BASE,
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* which is the KSEG address of the start of the DENSE memory
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* area.
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*/
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/*
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* NOTE: there prolly ought to be more validity checks and all
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* re: boundaries and sizes and such...
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*/
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/*
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* The Jensen lacks dense memory, thus we have to address the bus via
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* the sparse addressing scheme.
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*
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* Martin Ostermann (ost@comnets.rwth-aachen.de) - Apr.-Sep. 1996
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*/
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#ifdef linux
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#ifdef TEST_JENSEN_CODE /* define to test the Sparse addressing on a non-Jensen */
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#define SPARSE (5)
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#define isJensen (1)
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#else
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#define isJensen (!_bus_base())
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#define SPARSE (7)
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#endif
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extern unsigned long _bus_base(void);
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extern unsigned long _bus_base_sparse(void);
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#define BUS_BASE (isJensen ? _bus_base_sparse() : _bus_base())
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#define JENSEN_SHIFT(x) (isJensen ? ((long)x<<SPARSE) : (long)x)
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#else
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extern u_int64_t dense_base(void);
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#define BUS_BASE dense_base()
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#define JENSEN_SHIFT(x) ((long) x)
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#endif
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int
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xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
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int Len)
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{
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caddr_t base;
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int fd;
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int psize;
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int mlen;
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if ((fd = open(DEV_MEM, O_RDONLY)) < 0)
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{
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xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n",
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DEV_MEM, strerror(errno));
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return(-1);
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}
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psize = getpagesize();
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Offset += Base & (psize - 1);
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Base &= ~(psize - 1);
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mlen = (Offset + Len + psize - 1) & ~(psize - 1);
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base = mmap((caddr_t)0, JENSEN_SHIFT(mlen), PROT_READ,
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MAP_SHARED, fd, (off_t)(JENSEN_SHIFT(Base) + BUS_BASE));
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if (base == MAP_FAILED)
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{
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xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to mmap %s (%s)\n",
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DEV_MEM, strerror(errno));
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return(-1);
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}
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xf86SlowBCopyFromBus((unsigned char *)(base+JENSEN_SHIFT(Offset)),
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Buf, Len);
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munmap((caddr_t)JENSEN_SHIFT(base), JENSEN_SHIFT(mlen));
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close(fd);
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return(Len);
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}
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#endif /* __alpha__ */
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