1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 1998,2000 Doug Rabson <dfr@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <stand.h> 32 #include <string.h> 33 #include <setjmp.h> 34 #include <sys/disk.h> 35 36 #include "bootstrap.h" 37 #include "disk.h" 38 #include "libuserboot.h" 39 40 #if defined(USERBOOT_ZFS_SUPPORT) 41 #include <sys/zfs_bootenv.h> 42 #include "libzfs.h" 43 44 static void userboot_zfs_probe(void); 45 static int userboot_zfs_found; 46 #endif 47 48 /* Minimum version required */ 49 #define USERBOOT_VERSION USERBOOT_VERSION_3 50 51 #define LOADER_PATH "/boot/loader" 52 #define INTERP_MARKER "$Interpreter:" 53 54 #define MALLOCSZ (64*1024*1024) 55 56 struct loader_callbacks *callbacks; 57 void *callbacks_arg; 58 59 static jmp_buf jb; 60 61 struct arch_switch archsw; /* MI/MD interface boundary */ 62 63 static void extract_currdev(void); 64 static void check_interpreter(void); 65 66 void 67 delay(int usec) 68 { 69 70 CALLBACK(delay, usec); 71 } 72 73 time_t 74 getsecs(void) 75 { 76 77 /* 78 * userboot can't do netboot, so this implementation isn't strictly 79 * required. Defining it avoids issues with BIND_NOW, and it doesn't 80 * hurt to do it. 81 */ 82 return (time(NULL)); 83 } 84 85 void 86 exit(int v) 87 { 88 89 CALLBACK(exit, v); 90 longjmp(jb, 1); 91 } 92 93 static void 94 check_interpreter(void) 95 { 96 struct stat st; 97 size_t marklen, rdsize; 98 const char *guest_interp, *my_interp; 99 char *buf; 100 int fd; 101 102 /* 103 * If we can't stat(2) or open(2) LOADER_PATH, then we'll fail by 104 * simply letting us roll on with whatever interpreter we were compiled 105 * with. This is likely not going to be an issue in reality. 106 */ 107 buf = NULL; 108 if (stat(LOADER_PATH, &st) != 0) 109 return; 110 if ((fd = open(LOADER_PATH, O_RDONLY)) < 0) 111 return; 112 113 rdsize = st.st_size; 114 buf = malloc(rdsize); 115 if (buf == NULL) 116 goto out; 117 if (read(fd, buf, rdsize) < rdsize) 118 goto out; 119 120 marklen = strlen(INTERP_MARKER); 121 my_interp = bootprog_interp + marklen; 122 123 /* 124 * Here we make the assumption that a loader binary without the 125 * interpreter marker is a 4th one. All loader binaries going forward 126 * should have this properly specified, so our assumption should always 127 * be a good one. 128 */ 129 if ((guest_interp = memmem(buf, rdsize, INTERP_MARKER, 130 marklen)) != NULL) 131 guest_interp += marklen; 132 else 133 guest_interp = "4th"; 134 135 /* 136 * The guest interpreter may not have a version of loader that 137 * specifies the interpreter installed. If that's the case, we'll 138 * assume it's legacy (4th) and request a swap to that if we're 139 * a Lua-userboot. 140 */ 141 if (strcmp(my_interp, guest_interp) != 0) 142 CALLBACK(swap_interpreter, guest_interp); 143 out: 144 free(buf); 145 close(fd); 146 return; 147 } 148 149 void 150 loader_main(struct loader_callbacks *cb, void *arg, int version, int ndisks) 151 { 152 static char mallocbuf[MALLOCSZ]; 153 char *var; 154 int i; 155 156 if (version < USERBOOT_VERSION) 157 abort(); 158 159 callbacks = cb; 160 callbacks_arg = arg; 161 userboot_disk_maxunit = ndisks; 162 163 /* 164 * initialise the heap as early as possible. Once this is done, 165 * alloc() is usable. 166 */ 167 setheap((void *)mallocbuf, (void *)(mallocbuf + sizeof(mallocbuf))); 168 169 /* 170 * Hook up the console 171 */ 172 cons_probe(); 173 174 /* Set up currdev variable to have hooks in place. */ 175 env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev, env_nounset); 176 177 printf("\n%s", bootprog_info); 178 #if 0 179 printf("Memory: %ld k\n", memsize() / 1024); 180 #endif 181 182 setenv("LINES", "24", 1); /* optional */ 183 184 /* 185 * Set custom environment variables 186 */ 187 i = 0; 188 while (1) { 189 var = CALLBACK(getenv, i++); 190 if (var == NULL) 191 break; 192 putenv(var); 193 } 194 195 archsw.arch_autoload = userboot_autoload; 196 archsw.arch_getdev = userboot_getdev; 197 archsw.arch_copyin = userboot_copyin; 198 archsw.arch_copyout = userboot_copyout; 199 archsw.arch_readin = userboot_readin; 200 #if defined(USERBOOT_ZFS_SUPPORT) 201 archsw.arch_zfs_probe = userboot_zfs_probe; 202 #endif 203 204 /* 205 * Initialise the block cache. Set the upper limit. 206 */ 207 bcache_init(32768, 512); 208 devinit(); 209 extract_currdev(); 210 211 /* 212 * Checking the interpreter isn't worth the overhead unless we 213 * actually have the swap_interpreter callback, so we actually version 214 * check here rather than later on. 215 */ 216 if (version >= USERBOOT_VERSION_5) 217 check_interpreter(); 218 219 if (setjmp(jb)) 220 return; 221 222 interact(); /* doesn't return */ 223 224 exit(0); 225 } 226 227 /* 228 * Set the 'current device' by (if possible) recovering the boot device as 229 * supplied by the initial bootstrap. 230 */ 231 static void 232 extract_currdev(void) 233 { 234 struct disk_devdesc dev; 235 struct devdesc *dd; 236 #if defined(USERBOOT_ZFS_SUPPORT) 237 struct zfs_devdesc zdev; 238 char *buf = NULL; 239 240 if (userboot_zfs_found) { 241 242 /* Leave the pool/root guid's unassigned */ 243 bzero(&zdev, sizeof(zdev)); 244 zdev.dd.d_dev = &zfs_dev; 245 246 init_zfs_boot_options(devformat(&zdev.dd)); 247 dd = &zdev.dd; 248 } else 249 #endif 250 251 if (userboot_disk_maxunit > 0) { 252 dev.dd.d_dev = &userboot_disk; 253 dev.dd.d_unit = 0; 254 dev.d_slice = D_SLICEWILD; 255 dev.d_partition = D_PARTWILD; 256 /* 257 * If we cannot auto-detect the partition type then 258 * access the disk as a raw device. 259 */ 260 if (dev.dd.d_dev->dv_open(NULL, &dev)) { 261 dev.d_slice = D_SLICENONE; 262 dev.d_partition = D_PARTNONE; 263 } 264 dd = &dev.dd; 265 } else { 266 dev.dd.d_dev = &host_dev; 267 dev.dd.d_unit = 0; 268 dd = &dev.dd; 269 } 270 271 set_currdev(devformat(dd)); 272 273 #if defined(USERBOOT_ZFS_SUPPORT) 274 if (userboot_zfs_found) { 275 buf = malloc(VDEV_PAD_SIZE); 276 if (buf != NULL) { 277 if (zfs_get_bootonce(&zdev, OS_BOOTONCE, buf, 278 VDEV_PAD_SIZE) == 0) { 279 printf("zfs bootonce: %s\n", buf); 280 set_currdev(buf); 281 setenv("zfs-bootonce", buf, 1); 282 } 283 free(buf); 284 (void) zfs_attach_nvstore(&zdev); 285 } 286 } 287 #endif 288 } 289 290 #if defined(USERBOOT_ZFS_SUPPORT) 291 static void 292 userboot_zfs_probe(void) 293 { 294 char devname[32]; 295 uint64_t pool_guid; 296 int unit; 297 298 /* 299 * Open all the disks we can find and see if we can reconstruct 300 * ZFS pools from them. Record if any were found. 301 */ 302 for (unit = 0; unit < userboot_disk_maxunit; unit++) { 303 sprintf(devname, "disk%d:", unit); 304 pool_guid = 0; 305 zfs_probe_dev(devname, &pool_guid, true); 306 if (pool_guid != 0) 307 userboot_zfs_found = 1; 308 } 309 } 310 #endif 311 312 COMMAND_SET(quit, "quit", "exit the loader", command_quit); 313 314 static int 315 command_quit(int argc, char *argv[]) 316 { 317 318 exit(USERBOOT_EXIT_QUIT); 319 return (CMD_OK); 320 } 321 322 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 323 324 static int 325 command_reboot(int argc, char *argv[]) 326 { 327 328 exit(USERBOOT_EXIT_REBOOT); 329 return (CMD_OK); 330 } 331