| 1 | /* |
| 2 | * Copyright 1993 by David Wexelblat <dwex@goblin.org> |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that |
| 7 | * copyright notice and this permission notice appear in supporting |
| 8 | * documentation, and that the name of David Wexelblat not be used in |
| 9 | * advertising or publicity pertaining to distribution of the software without |
| 10 | * specific, written prior permission. David Wexelblat makes no representations |
| 11 | * about the suitability of this software for any purpose. It is provided |
| 12 | * "as is" without express or implied warranty. |
| 13 | * |
| 14 | * DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL DAVID WEXELBLAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 20 | * PERFORMANCE OF THIS SOFTWARE. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #ifdef HAVE_XORG_CONFIG_H |
| 25 | #include <xorg-config.h> |
| 26 | #endif |
| 27 | |
| 28 | #include <X11/X.h> |
| 29 | |
| 30 | #include "xf86.h" |
| 31 | #include "xf86Priv.h" |
| 32 | #include "xf86_OSlib.h" |
| 33 | |
| 34 | /* |
| 35 | * Read BIOS via mmap()ing DEV_MEM |
| 36 | */ |
| 37 | |
| 38 | #ifndef __alpha__ |
| 39 | int |
| 40 | xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf, |
| 41 | int Len) |
| 42 | { |
| 43 | int fd; |
| 44 | unsigned char *ptr; |
| 45 | int psize; |
| 46 | int mlen; |
| 47 | |
| 48 | if ((fd = open(DEV_MEM, O_RDONLY)) < 0) { |
| 49 | xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n", |
| 50 | DEV_MEM, strerror(errno)); |
| 51 | return -1; |
| 52 | } |
| 53 | psize = getpagesize(); |
| 54 | Offset += Base & (psize - 1); |
| 55 | Base &= ~(psize - 1); |
| 56 | mlen = (Offset + Len + psize - 1) & ~(psize - 1); |
| 57 | ptr = (unsigned char *) mmap((caddr_t) 0, mlen, PROT_READ, |
| 58 | MAP_SHARED, fd, (off_t) Base); |
| 59 | if (ptr == MAP_FAILED) { |
| 60 | xf86Msg(X_WARNING, "xf86ReadBIOS: %s mmap failed (%s)\n", |
| 61 | DEV_MEM, strerror(errno)); |
| 62 | close(fd); |
| 63 | return -1; |
| 64 | } |
| 65 | DebugF("xf86ReadBIOS: BIOS at 0x%08x has signature 0x%04x\n", |
| 66 | Base, ptr[0] | (ptr[1] << 8)); |
| 67 | (void) memcpy(Buf, (void *) (ptr + Offset), Len); |
| 68 | (void) munmap((caddr_t) ptr, mlen); |
| 69 | (void) close(fd); |
| 70 | return Len; |
| 71 | } |
| 72 | |
| 73 | #else /* __alpha__ */ |
| 74 | |
| 75 | /* |
| 76 | * We trick "mmap" into mapping BUS memory for us via BUS_BASE, |
| 77 | * which is the KSEG address of the start of the DENSE memory |
| 78 | * area. |
| 79 | */ |
| 80 | |
| 81 | /* |
| 82 | * NOTE: there prolly ought to be more validity checks and all |
| 83 | * re: boundaries and sizes and such... |
| 84 | */ |
| 85 | |
| 86 | #ifdef linux |
| 87 | |
| 88 | extern unsigned long _bus_base(void); |
| 89 | |
| 90 | #define BUS_BASE _bus_base() |
| 91 | |
| 92 | #else |
| 93 | |
| 94 | extern u_int64_t dense_base(void); |
| 95 | |
| 96 | #define BUS_BASE dense_base() |
| 97 | |
| 98 | #endif |
| 99 | |
| 100 | int |
| 101 | xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf, |
| 102 | int Len) |
| 103 | { |
| 104 | caddr_t base; |
| 105 | int fd; |
| 106 | int psize; |
| 107 | int mlen; |
| 108 | |
| 109 | if ((fd = open(DEV_MEM, O_RDONLY)) < 0) { |
| 110 | xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to open %s (%s)\n", |
| 111 | DEV_MEM, strerror(errno)); |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | psize = getpagesize(); |
| 116 | Offset += Base & (psize - 1); |
| 117 | Base &= ~(psize - 1); |
| 118 | mlen = (Offset + Len + psize - 1) & ~(psize - 1); |
| 119 | base = mmap((caddr_t) 0, mlen, PROT_READ, |
| 120 | MAP_SHARED, fd, (off_t) (Base + BUS_BASE)); |
| 121 | |
| 122 | if (base == MAP_FAILED) { |
| 123 | xf86Msg(X_WARNING, "xf86ReadBIOS: Failed to mmap %s (%s)\n", |
| 124 | DEV_MEM, strerror(errno)); |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | xf86SlowBCopyFromBus((unsigned char *) (base + Offset), Buf, Len); |
| 129 | |
| 130 | munmap((caddr_t) base, mlen); |
| 131 | close(fd); |
| 132 | return Len; |
| 133 | } |
| 134 | |
| 135 | #endif /* __alpha__ */ |