| | 1 | /* |
| | 2 | * devmem2.c: Simple program to read/write from/to any location in memory. |
| | 3 | * |
| | 4 | * Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl) |
| | 5 | * |
| | 6 | * |
| | 7 | * This software has been developed for the LART computing board |
| | 8 | * (http://www.lart.tudelft.nl/). The development has been sponsored by |
| | 9 | * the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/) |
| | 10 | * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/) |
| | 11 | * projects. |
| | 12 | * |
| | 13 | * The author can be reached at: |
| | 14 | * |
| | 15 | * Jan-Derk Bakker |
| | 16 | * Information and Communication Theory Group |
| | 17 | * Faculty of Information Technology and Systems |
| | 18 | * Delft University of Technology |
| | 19 | * P.O. Box 5031 |
| | 20 | * 2600 GA Delft |
| | 21 | * The Netherlands |
| | 22 | * |
| | 23 | * |
| | 24 | * This program is free software; you can redistribute it and/or modify |
| | 25 | * it under the terms of the GNU General Public License as published by |
| | 26 | * the Free Software Foundation; either version 2 of the License, or |
| | 27 | * (at your option) any later version. |
| | 28 | * |
| | 29 | * This program is distributed in the hope that it will be useful, |
| | 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 32 | * GNU General Public License for more details. |
| | 33 | * |
| | 34 | * You should have received a copy of the GNU General Public License |
| | 35 | * along with this program; if not, write to the Free Software |
| | 36 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| | 37 | * |
| | 38 | */ |
| | 39 | |
| | 40 | #include <stdio.h> |
| | 41 | #include <stdlib.h> |
| | 42 | #include <unistd.h> |
| | 43 | #include <string.h> |
| | 44 | #include <errno.h> |
| | 45 | #include <signal.h> |
| | 46 | #include <fcntl.h> |
| | 47 | #include <ctype.h> |
| | 48 | #include <termios.h> |
| | 49 | #include <sys/types.h> |
| | 50 | #include <sys/mman.h> |
| | 51 | #include <sys/stat.h> |
| | 52 | |
| | 53 | |
| | 54 | #define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \ |
| | 55 | __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0) |
| | 56 | |
| | 57 | #define MAP_SIZE 4096UL |
| | 58 | #define MAP_MASK (MAP_SIZE - 1) |
| | 59 | |
| | 60 | int main(int argc, char **argv) { |
| | 61 | |
| | 62 | int fd, input_fd; |
| | 63 | |
| | 64 | void *map_base, *virt_addr; |
| | 65 | unsigned long read_result, writeval; |
| | 66 | off_t target; |
| | 67 | int access_type = 'w'; |
| | 68 | |
| | 69 | if(argc < 3) { |
| | 70 | fprintf(stderr, "\nUsage:\t%s { address } { file }\n" |
| | 71 | "\taddress : memory address to act upon\n" |
| | 72 | "\tfile : file to load\n\n", argv[0]); |
| | 73 | exit(1); |
| | 74 | } |
| | 75 | |
| | 76 | input_fd = open(argv[2], O_RDONLY); |
| | 77 | if (input_fd < 0) FATAL; |
| | 78 | |
| | 79 | struct stat st; |
| | 80 | if (fstat(input_fd, &st) < 0) FATAL; |
| | 81 | |
| | 82 | char * buf = malloc(st.st_size); |
| | 83 | if (!buf) FATAL; |
| | 84 | if (read(input_fd, buf, st.st_size) != st.st_size) FATAL; |
| | 85 | |
| | 86 | target = strtoul(argv[1], 0, 0); |
| | 87 | |
| | 88 | fd = open("/dev/mem", O_RDWR | O_SYNC); |
| | 89 | if (fd < 0) FATAL; |
| | 90 | |
| | 91 | printf("/dev/mem opened.\n"); |
| | 92 | fflush(stdout); |
| | 93 | |
| | 94 | /* Map one page */ |
| | 95 | map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, |
| | 96 | MAP_SHARED, fd, target & ~MAP_MASK); |
| | 97 | |
| | 98 | if (map_base == (void *) -1) FATAL; |
| | 99 | |
| | 100 | printf("Memory mapped at address %p.\n", map_base); |
| | 101 | fflush(stdout); |
| | 102 | |
| | 103 | virt_addr = map_base + (target & MAP_MASK); |
| | 104 | memcpy(virt_addr, buf, st.st_size); |
| | 105 | |
| | 106 | printf("Copied %d bytes.\n", st.st_size); |
| | 107 | |
| | 108 | return 0; |
| | 109 | } |
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