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 <stand.h> 29 #include <string.h> 30 #include <setjmp.h> 31 #include <sys/disk.h> 32 33 #include "bootstrap.h" 34 #include "disk.h" 35 #include "libuserboot.h" 36 37 #if defined(USERBOOT_ZFS_SUPPORT) 38 #include <sys/zfs_bootenv.h> 39 #include "libzfs.h" 40 41 static void userboot_zfs_probe(void); 42 static int userboot_zfs_found; 43 #endif 44 45 /* Minimum version required */ 46 #define USERBOOT_VERSION USERBOOT_VERSION_3 47 48 #define LOADER_PATH "/boot/loader" 49 #define INTERP_MARKER "$Interpreter:" 50 51 #define MALLOCSZ (64*1024*1024) 52 53 struct loader_callbacks *callbacks; 54 void *callbacks_arg; 55 56 static jmp_buf jb; 57 58 struct arch_switch archsw; /* MI/MD interface boundary */ 59 60 static void extract_currdev(void); 61 static void check_interpreter(void); 62 63 void 64 delay(int usec) 65 { 66 67 CALLBACK(delay, usec); 68 } 69 70 time_t 71 getsecs(void) 72 { 73 74 /* 75 * userboot can't do netboot, so this implementation isn't strictly 76 * required. Defining it avoids issues with BIND_NOW, and it doesn't 77 * hurt to do it. 78 */ 79 return (time(NULL)); 80 } 81 82 void 83 exit(int v) 84 { 85 86 CALLBACK(exit, v); 87 longjmp(jb, 1); 88 } 89 90 static void 91 check_interpreter(void) 92 { 93 struct stat st; 94 size_t marklen, rdsize; 95 const char *guest_interp, *my_interp; 96 char *buf; 97 int fd; 98 99 /* 100 * If we can't stat(2) or open(2) LOADER_PATH, then we'll fail by 101 * simply letting us roll on with whatever interpreter we were compiled 102 * with. This is likely not going to be an issue in reality. 103 */ 104 buf = NULL; 105 if (stat(LOADER_PATH, &st) != 0) 106 return; 107 if ((fd = open(LOADER_PATH, O_RDONLY)) < 0) 108 return; 109 110 rdsize = st.st_size; 111 buf = malloc(rdsize); 112 if (buf == NULL) 113 goto out; 114 if (read(fd, buf, rdsize) < rdsize) 115 goto out; 116 117 marklen = strlen(INTERP_MARKER); 118 my_interp = bootprog_interp + marklen; 119 120 /* 121 * Here we make the assumption that a loader binary without the 122 * interpreter marker is a 4th one. All loader binaries going forward 123 * should have this properly specified, so our assumption should always 124 * be a good one. 125 */ 126 if ((guest_interp = memmem(buf, rdsize, INTERP_MARKER, 127 marklen)) != NULL) 128 guest_interp += marklen; 129 else 130 guest_interp = "4th"; 131 132 /* 133 * The guest interpreter may not have a version of loader that 134 * specifies the interpreter installed. If that's the case, we'll 135 * assume it's legacy (4th) and request a swap to that if we're 136 * a Lua-userboot. 137 */ 138 if (strcmp(my_interp, guest_interp) != 0) 139 CALLBACK(swap_interpreter, guest_interp); 140 out: 141 free(buf); 142 close(fd); 143 return; 144 } 145 146 void 147 loader_main(struct loader_callbacks *cb, void *arg, int version, int ndisks) 148 { 149 static char mallocbuf[MALLOCSZ]; 150 char *var; 151 int i; 152 153 if (version < USERBOOT_VERSION) 154 abort(); 155 156 callbacks = cb; 157 callbacks_arg = arg; 158 userboot_disk_maxunit = ndisks; 159 160 /* 161 * initialise the heap as early as possible. Once this is done, 162 * alloc() is usable. 163 */ 164 setheap((void *)mallocbuf, (void *)(mallocbuf + sizeof(mallocbuf))); 165 166 /* 167 * Hook up the console 168 */ 169 cons_probe(); 170 171 /* Set up currdev variable to have hooks in place. */ 172 env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev, env_nounset); 173 174 printf("\n%s", bootprog_info); 175 #if 0 176 printf("Memory: %ld k\n", memsize() / 1024); 177 #endif 178 179 setenv("LINES", "24", 1); /* optional */ 180 181 /* 182 * Set custom environment variables 183 */ 184 i = 0; 185 while (1) { 186 var = CALLBACK(getenv, i++); 187 if (var == NULL) 188 break; 189 putenv(var); 190 } 191 192 archsw.arch_autoload = userboot_autoload; 193 archsw.arch_getdev = userboot_getdev; 194 archsw.arch_copyin = userboot_copyin; 195 archsw.arch_copyout = userboot_copyout; 196 archsw.arch_readin = userboot_readin; 197 #if defined(USERBOOT_ZFS_SUPPORT) 198 archsw.arch_zfs_probe = userboot_zfs_probe; 199 #endif 200 201 /* 202 * Initialise the block cache. Set the upper limit. 203 */ 204 bcache_init(32768, 512); 205 devinit(); 206 extract_currdev(); 207 208 /* 209 * Checking the interpreter isn't worth the overhead unless we 210 * actually have the swap_interpreter callback, so we actually version 211 * check here rather than later on. 212 */ 213 if (version >= USERBOOT_VERSION_5) 214 check_interpreter(); 215 216 if (setjmp(jb)) 217 return; 218 219 interact(); /* doesn't return */ 220 221 exit(0); 222 } 223 224 /* 225 * Set the 'current device' by (if possible) recovering the boot device as 226 * supplied by the initial bootstrap. 227 */ 228 static void 229 extract_currdev(void) 230 { 231 struct disk_devdesc dev; 232 struct devdesc *dd; 233 #if defined(USERBOOT_ZFS_SUPPORT) 234 struct zfs_devdesc zdev; 235 236 if (userboot_zfs_found) { 237 238 /* Leave the pool/root guid's unassigned */ 239 bzero(&zdev, sizeof(zdev)); 240 zdev.dd.d_dev = &zfs_dev; 241 242 init_zfs_boot_options(devformat(&zdev.dd)); 243 dd = &zdev.dd; 244 } else 245 #endif 246 247 if (userboot_disk_maxunit > 0) { 248 dev.dd.d_dev = &userboot_disk; 249 dev.dd.d_unit = 0; 250 dev.d_slice = D_SLICEWILD; 251 dev.d_partition = D_PARTWILD; 252 /* 253 * If we cannot auto-detect the partition type then 254 * access the disk as a raw device. 255 */ 256 if (dev.dd.d_dev->dv_open(NULL, &dev)) { 257 dev.d_slice = D_SLICENONE; 258 dev.d_partition = D_PARTNONE; 259 } 260 dd = &dev.dd; 261 } else { 262 dev.dd.d_dev = &host_dev; 263 dev.dd.d_unit = 0; 264 dd = &dev.dd; 265 } 266 267 set_currdev(devformat(dd)); 268 269 #if defined(USERBOOT_ZFS_SUPPORT) 270 if (userboot_zfs_found) { 271 char buf[VDEV_PAD_SIZE]; 272 273 if (zfs_get_bootonce(&zdev, OS_BOOTONCE, buf, sizeof(buf)) == 0) { 274 printf("zfs bootonce: %s\n", buf); 275 set_currdev(buf); 276 setenv("zfs-bootonce", buf, 1); 277 } 278 (void)zfs_attach_nvstore(&zdev); 279 } 280 #endif 281 } 282 283 #if defined(USERBOOT_ZFS_SUPPORT) 284 static void 285 userboot_zfs_probe(void) 286 { 287 char devname[32]; 288 uint64_t pool_guid; 289 int unit; 290 291 /* 292 * Open all the disks we can find and see if we can reconstruct 293 * ZFS pools from them. Record if any were found. 294 */ 295 for (unit = 0; unit < userboot_disk_maxunit; unit++) { 296 sprintf(devname, "disk%d:", unit); 297 pool_guid = 0; 298 zfs_probe_dev(devname, &pool_guid, true); 299 if (pool_guid != 0) 300 userboot_zfs_found = 1; 301 } 302 } 303 #endif 304 305 COMMAND_SET(quit, "quit", "exit the loader", command_quit); 306 307 static int 308 command_quit(int argc, char *argv[]) 309 { 310 311 exit(USERBOOT_EXIT_QUIT); 312 return (CMD_OK); 313 } 314 315 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 316 317 static int 318 command_reboot(int argc, char *argv[]) 319 { 320 321 exit(USERBOOT_EXIT_REBOOT); 322 return (CMD_OK); 323 } 324