├── Makefile ├── README.md ├── devmem2.c └── LICENSE /Makefile: -------------------------------------------------------------------------------- 1 | 2 | PREFIX ?= /usr 3 | BINDIR ?= $(PREFIX)/bin 4 | MANDIR ?= $(PREFIX)/share/man 5 | 6 | CC ?= "gcc" 7 | 8 | CFLAGS ?= -O2 -g -Wall 9 | 10 | SRC=devmem2.c 11 | 12 | devmem2: $(SRC) 13 | $(CC) $(CFLAGS) $(LDFLAGS) $(LIBS) -o $@ $(SRC) 14 | 15 | # Install as "devmem2" 16 | install: 17 | mkdir -p $(BINDIR) 18 | install devmem2 $(BINDIR) 19 | 20 | # Rename to "mem" : we like it this way. 21 | installmem: 22 | install -s -D devmem2 $(BINDIR)/mem 23 | 24 | clean: 25 | rm -f devmem2 *.o *~ 26 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # devmem2 2 | 3 | Program to read/write from/to any location in physical memory 4 | 5 | This is enhanced variant of "devmem" or "devmem2" utility. 6 | Source and documentation: http://git.io/vZ5iD 7 | 8 | For Linux 2.6 - 3.x - 4.x 9 | 10 | 11 | Origin: https://github.com/VCTLabs/devmem2 12 | By lartware, 2004 13 | http://www.lartmaker.nl/lartware/port/ 14 | 15 | This variant is not 100% compatible with the original, do not use it as a drop-in replacement. 16 | 17 | See the wiki in this github repo for details on usage and building. 18 | -------------------------------------------------------------------------------- /devmem2.c: -------------------------------------------------------------------------------- 1 | /* 2 | * devmem2.c: Simple program to read/write from/to any location in memory. 3 | * 4 | * Copyright (C) 2000, Jan-Derk Bakker (jdb@lartmaker.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 | * Copyright (C) 2015, Trego Ltd. 14 | * 15 | * This program is free software; you can redistribute it and/or modify 16 | * it under the terms of the GNU General Public License as published by 17 | * the Free Software Foundation; either version 2 of the License, or 18 | * (at your option) any later version. 19 | * 20 | * This program is distributed in the hope that it will be useful, 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 | * GNU General Public License for more details. 24 | * 25 | * You should have received a copy of the GNU General Public License 26 | * along with this program. If not, see . 27 | */ 28 | 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include 34 | #include 35 | #include 36 | #include 37 | #include 38 | #include 39 | 40 | #define printerr(fmt,...) do { fprintf(stderr, fmt, ## __VA_ARGS__); fflush(stderr); } while(0) 41 | 42 | #define VER_STR "devmem version T/C (http://git.io/vZ5iD) rev.0.3e" 43 | 44 | int f_dbg = 0; 45 | 46 | static void usage(const char *cmd) 47 | { 48 | fprintf(stderr, "\nUsage:\t%s [-switches] address [ type [ data ] ]\n" 49 | "\taddress : memory address to act upon\n" 50 | "\ttype : access operation type : [b]yte, [h]alfword, [w]ord\n" 51 | "\tdata : data to be written\n\n" 52 | "Switches:\n" 53 | "\t-r : read back after write\n" 54 | "\t-a : do not check alignment\n" 55 | "\t--version | -V : print version\n" 56 | "\n", 57 | cmd); 58 | } 59 | 60 | int main(int argc, char **argv) 61 | { 62 | int fd; 63 | void *map_base, *virt_addr; 64 | unsigned long read_result = -1, writeval=-1; 65 | uint64_t target; 66 | int access_type = 'w'; 67 | int access_size = 4; 68 | unsigned int pagesize = (unsigned)getpagesize(); /* or sysconf(_SC_PAGESIZE) */ 69 | unsigned int map_size = pagesize; 70 | unsigned offset; 71 | char *endp = NULL; 72 | int f_readback = 0; // flag to read back after write 73 | int f_align_check = 1; // flag to require alignment 74 | const char *progname = argv[0]; 75 | int opt; 76 | 77 | opterr = 0; 78 | while ((opt = getopt(argc, argv, "+raAdV")) != -1) { 79 | switch(opt) { 80 | case 'r': 81 | f_readback = 1; 82 | break; 83 | case 'a': 84 | f_align_check = 0; 85 | break; 86 | case 'A': 87 | // Absolute address mode. Does nothing now, for future compat.; 88 | break; 89 | case 'd': 90 | f_dbg = 1; 91 | break; 92 | case 'V': 93 | printf(VER_STR "\n"); 94 | exit(0); 95 | default: 96 | if ( (!argv[optind]) || 0 == strcmp(argv[optind], "--help")) { 97 | usage(progname); 98 | exit(1); 99 | } 100 | 101 | if (0 == strncmp(argv[optind], "--vers", 6)) { 102 | printf(VER_STR "\n"); 103 | exit(0); 104 | } 105 | 106 | printerr("Unknown long option: %s\n", argv[optind]); 107 | exit(2); 108 | } 109 | } 110 | 111 | argc -= optind - 1; 112 | argv += optind - 1; 113 | 114 | if (argc < 2 || argc > 4) { 115 | usage(progname); 116 | exit(1); 117 | } 118 | 119 | if (argc > 2) { 120 | if (!isdigit(argv[1][0])) { 121 | // Allow access_type be 1st arg, then swap 1st and 2nd 122 | char *t = argv[2]; 123 | argv[2] = argv[1]; 124 | argv[1] = t; 125 | } 126 | 127 | access_type = tolower(argv[2][0]); 128 | if (argv[2][1] ) 129 | access_type = '?'; 130 | } 131 | 132 | errno = 0; 133 | target = strtoull(argv[1], &endp, 0); 134 | if (errno != 0 || (endp && 0 != *endp)) { 135 | printerr("Invalid memory address: %s\n", argv[1]); 136 | exit(2); 137 | } 138 | 139 | switch (access_type) { 140 | case 'b': 141 | access_size = 1; 142 | break; 143 | case 'w': 144 | access_size = 4; 145 | break; 146 | case 'h': 147 | access_size = 2; 148 | break; 149 | default: 150 | printerr("Illegal data type: %s\n", argv[2]); 151 | exit(2); 152 | } 153 | 154 | if ((target + access_size -1) < target) { 155 | printerr("ERROR: rolling over end of memory\n"); 156 | exit(2); 157 | } 158 | 159 | if ( (sizeof(off_t) < sizeof(int64_t)) && (target > UINT32_MAX) ) { 160 | printerr("The address %s > 32 bits. Try to rebuild in 64-bit mode.\n", argv[1]); 161 | // Consider mmap2() instead of this check 162 | exit(2); 163 | } 164 | 165 | offset = (unsigned int)(target & (pagesize-1)); 166 | if (offset + access_size > pagesize ) { 167 | // Access straddles page boundary: add another page: 168 | map_size += pagesize; 169 | } 170 | 171 | if (f_dbg) { 172 | printerr("Address: %#" PRIX64 " op.size=%d\n", target, access_size); 173 | } 174 | if (f_align_check && offset & (access_size - 1)) { 175 | printerr("ERROR: address not aligned on %d!\n", access_size); 176 | exit(2); 177 | } 178 | 179 | fd = open("/dev/mem", O_RDWR | O_SYNC); 180 | if (fd == -1) { 181 | printerr("Error opening /dev/mem (%d) : %s\n", errno, strerror(errno)); 182 | exit(1); 183 | } 184 | //printf("/dev/mem opened.\n"); 185 | //fflush(stdout); 186 | 187 | map_base = mmap(0, map_size, PROT_READ | PROT_WRITE, MAP_SHARED, 188 | fd, 189 | target & ~((typeof(target))pagesize-1)); 190 | if (map_base == (void *) -1) { 191 | printerr("Error mapping (%d) : %s\n", errno, strerror(errno)); 192 | exit(1); 193 | } 194 | //printf("Memory mapped at address %p.\n", map_base); 195 | //fflush(stdout); 196 | 197 | virt_addr = map_base + offset; 198 | 199 | if (argc > 3) { 200 | errno = 0; 201 | writeval = strtoul(argv[3], &endp, 0); 202 | if (errno || (endp && 0 != *endp)) { 203 | printerr("Invalid data value: %s\n", argv[3]); 204 | exit(2); 205 | } 206 | 207 | if (access_size < sizeof(writeval) && 0 != (writeval >> (access_size * 8))) { 208 | printerr("ERROR: Data value %s does not fit in %d byte(s)\n", argv[3], access_size); 209 | exit(2); 210 | } 211 | 212 | switch (access_size) { 213 | case 1: 214 | *((volatile uint8_t *) virt_addr) = writeval; 215 | break; 216 | case 2: 217 | *((volatile uint16_t *) virt_addr) = writeval; 218 | break; 219 | case 4: 220 | *((volatile uint32_t *) virt_addr) = writeval; 221 | break; 222 | } 223 | 224 | if (f_dbg) { 225 | printerr("Address: %#" PRIX64 " Written: %#lX\n", target, writeval); 226 | fflush(stdout); 227 | } 228 | } 229 | 230 | if (argc <= 3 || f_readback) { 231 | switch (access_size) { 232 | case 1: 233 | read_result = *((volatile uint8_t *) virt_addr); 234 | break; 235 | case 2: 236 | read_result = *((volatile uint16_t *) virt_addr); 237 | break; 238 | case 4: 239 | read_result = *((volatile uint32_t *) virt_addr); 240 | break; 241 | } 242 | 243 | //printf("Value at address 0x%lld (%p): 0x%lu\n", (long long)target, virt_addr, read_result); 244 | //fflush(stdout); 245 | if (f_readback && argc > 3) 246 | printf("Written 0x%lx; readback 0x%lx\n", writeval, read_result); 247 | else 248 | printf("%08lX\n", read_result); 249 | fflush(stdout); 250 | } 251 | 252 | if (munmap(map_base, map_size) != 0) { 253 | printerr("ERROR munmap (%d) %s\n", errno, strerror(errno)); 254 | } 255 | 256 | close(fd); 257 | 258 | return 0; 259 | } 260 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If you wish to incorporate parts of the Program into other free 251 | programs whose distribution conditions are different, write to the author 252 | to ask for permission. For software which is copyrighted by the Free 253 | Software Foundation, write to the Free Software Foundation; we sometimes 254 | make exceptions for this. Our decision will be guided by the two goals 255 | of preserving the free status of all derivatives of our free software and 256 | of promoting the sharing and reuse of software generally. 257 | 258 | NO WARRANTY 259 | 260 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 261 | FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 262 | OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 263 | PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 264 | OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 265 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | --------------------------------------------------------------------------------