diff options
Diffstat (limited to 'hw/xfree86/os-support/shared/bios_mmap.c')
| -rw-r--r-- | hw/xfree86/os-support/shared/bios_mmap.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/shared/bios_mmap.c b/hw/xfree86/os-support/shared/bios_mmap.c new file mode 100644 index 000000000..ee7584222 --- /dev/null +++ b/hw/xfree86/os-support/shared/bios_mmap.c @@ -0,0 +1,160 @@ +/* $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__ */ |