1 /* $OpenBSD: memconfig.c,v 1.12 2007/09/02 15:19:39 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 Michael Smith <msmith@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: /home/ncvs/src/usr.sbin/memcontrol/memcontrol.c,v 1.8 2002/09/15 15:07:55 dwmalone Exp $ 29 */ 30 31 #include <sys/types.h> 32 #include <sys/ioctl.h> 33 #include <sys/memrange.h> 34 35 #include <err.h> 36 #include <fcntl.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 struct { 43 const char *name; 44 int val; 45 int kind; 46 #define MDF_SETTABLE (1<<0) 47 } attrnames[] = { 48 {"uncacheable", MDF_UNCACHEABLE, MDF_SETTABLE}, 49 {"write-combine", MDF_WRITECOMBINE, MDF_SETTABLE}, 50 {"write-through", MDF_WRITETHROUGH, MDF_SETTABLE}, 51 {"write-back", MDF_WRITEBACK, MDF_SETTABLE}, 52 {"write-protect", MDF_WRITEPROTECT, MDF_SETTABLE}, 53 {"force", MDF_FORCE, MDF_SETTABLE}, 54 {"unknown", MDF_UNKNOWN, 0}, 55 {"fixed-base", MDF_FIXBASE, 0}, 56 {"fixed-length", MDF_FIXLEN, 0}, 57 {"set-by-firmware", MDF_FIRMWARE, 0}, 58 {"active", MDF_ACTIVE, MDF_SETTABLE}, 59 {"bogus", MDF_BOGUS, 0}, 60 {NULL, 0, 0} 61 }; 62 63 static void listfunc(int, int, char *[]); 64 static void setfunc(int, int, char *[]); 65 static void clearfunc(int, int, char *[]); 66 static void helpfunc(int, int, char *[]); 67 static void help(const char *); 68 static struct mem_range_desc *mrgetall(int, int *); 69 70 struct 71 { 72 const char *cmd; 73 const char *desc; 74 void (*func)(int, int, char *[]); 75 } functions[] = { 76 {"list", 77 "List current memory range attributes\n" 78 " list [-a]\n" 79 " -a list all range slots, even those that are inactive", 80 listfunc}, 81 {"set", 82 "Set memory range attributes\n" 83 " set -b <base> -l <length> -o <owner> <attribute>\n" 84 " <base> memory range base address\n" 85 " <length> length of memory range in bytes, power of 2\n" 86 " <owner> text identifier for this setting (7 char max)\n" 87 " <attribute> attribute(s) to be applied to this range:\n" 88 " uncacheable\n" 89 " write-combine\n" 90 " write-through\n" 91 " write-back\n" 92 " write-protect", 93 setfunc}, 94 {"clear", 95 "Clear memory range attributes\n" 96 " clear -o <owner>\n" 97 " <owner> all ranges with this owner will be cleared\n" 98 " clear -b <base> -l <length>\n" 99 " <base> memory range base address\n" 100 " <length> length of memory range in bytes, power of 2\n" 101 " Base and length must exactly match an existing range", 102 clearfunc}, 103 {NULL, NULL, helpfunc} 104 }; 105 106 int 107 main(int argc, char *argv[]) 108 { 109 int i, memfd; 110 111 if (argc < 2) { 112 help(NULL); 113 } else { 114 if ((memfd = open("/dev/mem", O_RDONLY)) == -1) 115 err(1, "can't open /dev/mem"); 116 117 for (i = 0; functions[i].cmd != NULL; i++) 118 if (!strcmp(argv[1], functions[i].cmd)) 119 break; 120 functions[i].func(memfd, argc - 1, argv + 1); 121 close(memfd); 122 } 123 return(0); 124 } 125 126 static struct mem_range_desc * 127 mrgetall(int memfd, int *nmr) 128 { 129 struct mem_range_desc *mrd; 130 struct mem_range_op mro; 131 132 mro.mo_arg[0] = 0; 133 if (ioctl(memfd, MEMRANGE_GET, &mro)) 134 err(1, "can't size range descriptor array"); 135 136 *nmr = mro.mo_arg[0]; 137 mrd = calloc(*nmr, sizeof(struct mem_range_desc)); 138 if (mrd == NULL) 139 errx(1, "can't allocate %zu bytes for %d range descriptors", 140 *nmr * sizeof(struct mem_range_desc), *nmr); 141 142 mro.mo_arg[0] = *nmr; 143 mro.mo_desc = mrd; 144 if (ioctl(memfd, MEMRANGE_GET, &mro)) 145 err(1, "can't fetch range descriptor array"); 146 147 return(mrd); 148 } 149 150 151 static void 152 listfunc(int memfd, int argc, char *argv[]) 153 { 154 int nd, i, j, ch, showall = 0; 155 struct mem_range_desc *mrd; 156 char *owner; 157 158 owner = NULL; 159 while ((ch = getopt(argc, argv, "ao:")) != -1) 160 switch(ch) { 161 case 'a': 162 showall = 1; 163 break; 164 case 'o': 165 if (!(owner = strdup(optarg))) 166 errx(1, "out of memory"); 167 break; 168 default: 169 help("list"); 170 } 171 172 mrd = mrgetall(memfd, &nd); 173 174 for (i = 0; i < nd; i++) { 175 if (!showall && !(mrd[i].mr_flags & MDF_ACTIVE)) 176 continue; 177 if (owner && strcmp(mrd[i].mr_owner, owner)) 178 continue; 179 printf("%qx/%qx %.8s ", mrd[i].mr_base, mrd[i].mr_len, 180 mrd[i].mr_owner[0] ? mrd[i].mr_owner : "-"); 181 for (j = 0; attrnames[j].name != NULL; j++) 182 if (mrd[i].mr_flags & attrnames[j].val) 183 printf("%s ", attrnames[j].name); 184 printf("\n"); 185 } 186 free(mrd); 187 if (owner) 188 free(owner); 189 } 190 191 static void 192 setfunc(int memfd, int argc, char *argv[]) 193 { 194 struct mem_range_desc mrd; 195 struct mem_range_op mro; 196 int i, ch; 197 char *ep; 198 199 mrd.mr_base = 0; 200 mrd.mr_len = 0; 201 mrd.mr_flags = 0; 202 strlcpy(mrd.mr_owner, "user", sizeof mrd.mr_owner); 203 204 while ((ch = getopt(argc, argv, "b:l:o:")) != -1) 205 switch(ch) { 206 case 'b': 207 mrd.mr_base = strtouq(optarg, &ep, 0); 208 if ((ep == optarg) || (*ep != 0)) 209 help("set"); 210 break; 211 case 'l': 212 mrd.mr_len = strtouq(optarg, &ep, 0); 213 if ((ep == optarg) || (*ep != 0)) 214 help("set"); 215 break; 216 case 'o': 217 if (*optarg == 0 || 218 strlen(optarg) > sizeof(mrd.mr_owner)-1) 219 help("set"); 220 strlcpy(mrd.mr_owner, optarg, sizeof mrd.mr_owner); 221 break; 222 default: 223 help("set"); 224 } 225 226 if (mrd.mr_len == 0) 227 help("set"); 228 229 argc -= optind; 230 argv += optind; 231 232 while(argc--) { 233 for (i = 0; attrnames[i].name != NULL; i++) { 234 if (!strcmp(attrnames[i].name, argv[0])) { 235 if (!attrnames[i].kind & MDF_SETTABLE) 236 help("flags"); 237 mrd.mr_flags |= attrnames[i].val; 238 break; 239 } 240 } 241 if (attrnames[i].name == NULL) 242 help("flags"); 243 argv++; 244 } 245 246 mro.mo_desc = &mrd; 247 mro.mo_arg[0] = 0; 248 if (ioctl(memfd, MEMRANGE_SET, &mro)) 249 err(1, "can't set range"); 250 } 251 252 static void 253 clearfunc(int memfd, int argc, char *argv[]) 254 { 255 struct mem_range_desc mrd, *mrdp; 256 struct mem_range_op mro; 257 int i, nd, ch; 258 char *ep, *owner; 259 260 mrd.mr_base = 0; 261 mrd.mr_len = 0; 262 owner = NULL; 263 while ((ch = getopt(argc, argv, "b:l:o:")) != -1) 264 switch(ch) { 265 case 'b': 266 mrd.mr_base = strtouq(optarg, &ep, 0); 267 if ((ep == optarg) || (*ep != 0)) 268 help("clear"); 269 break; 270 case 'l': 271 mrd.mr_len = strtouq(optarg, &ep, 0); 272 if ((ep == optarg) || (*ep != 0)) 273 help("clear"); 274 break; 275 case 'o': 276 if ((*optarg == 0) || (strlen(optarg) > 7)) 277 help("clear"); 278 if (!(owner = strdup(optarg))) 279 errx(1, "out of memory"); 280 break; 281 282 default: 283 help("clear"); 284 } 285 286 if (owner != NULL) { 287 /* clear-by-owner */ 288 if ((mrd.mr_base != 0) || (mrd.mr_len != 0)) 289 help("clear"); 290 291 mrdp = mrgetall(memfd, &nd); 292 mro.mo_arg[0] = MEMRANGE_SET_REMOVE; 293 for (i = 0; i < nd; i++) { 294 if (!strcmp(owner, mrdp[i].mr_owner) && 295 (mrdp[i].mr_flags & MDF_ACTIVE) && 296 !(mrdp[i].mr_flags & MDF_FIXACTIVE)) { 297 298 mro.mo_desc = mrdp + i; 299 if (ioctl(memfd, MEMRANGE_SET, &mro)) 300 warn("couldn't clear range owned by '%s'", 301 owner); 302 } 303 } 304 } else if ((mrd.mr_base != 0) && (mrd.mr_len != 0)) { 305 /* clear-by-base/len */ 306 mro.mo_arg[0] = MEMRANGE_SET_REMOVE; 307 mro.mo_desc = &mrd; 308 if (ioctl(memfd, MEMRANGE_SET, &mro)) 309 err(1, "couldn't clear range"); 310 } else { 311 help("clear"); 312 } 313 } 314 315 static void 316 helpfunc(int memfd, int argc, char *argv[]) 317 { 318 help(argv[1]); 319 } 320 321 static void 322 help(const char *what) 323 { 324 int i; 325 326 if (what != NULL) { 327 /* find a function that matches */ 328 for (i = 0; functions[i].cmd != NULL; i++) 329 if (!strcmp(what, functions[i].cmd)) { 330 fprintf(stderr, "%s\n", functions[i].desc); 331 return; 332 } 333 fprintf(stderr, "Unknown command '%s'\n", what); 334 } 335 336 /* print general help */ 337 fprintf(stderr, "Valid commands are :\n"); 338 for (i = 0; functions[i].cmd != NULL; i++) 339 fprintf(stderr, " %s\n", functions[i].cmd); 340 fprintf(stderr, "Use help <command> for command-specific help\n"); 341 } 342