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 "libzfs.h" 42 43 static void userboot_zfs_probe(void); 44 static int userboot_zfs_found; 45 #endif 46 47 /* Minimum version required */ 48 #define USERBOOT_VERSION USERBOOT_VERSION_3 49 50 #define MALLOCSZ (64*1024*1024) 51 52 struct loader_callbacks *callbacks; 53 void *callbacks_arg; 54 55 static jmp_buf jb; 56 57 struct arch_switch archsw; /* MI/MD interface boundary */ 58 59 static void extract_currdev(void); 60 61 void 62 delay(int usec) 63 { 64 65 CALLBACK(delay, usec); 66 } 67 68 void 69 exit(int v) 70 { 71 72 CALLBACK(exit, v); 73 longjmp(jb, 1); 74 } 75 76 void 77 loader_main(struct loader_callbacks *cb, void *arg, int version, int ndisks) 78 { 79 static char mallocbuf[MALLOCSZ]; 80 char *var; 81 int i; 82 83 if (version < USERBOOT_VERSION) 84 abort(); 85 86 callbacks = cb; 87 callbacks_arg = arg; 88 userboot_disk_maxunit = ndisks; 89 90 /* 91 * initialise the heap as early as possible. Once this is done, 92 * alloc() is usable. 93 */ 94 setheap((void *)mallocbuf, (void *)(mallocbuf + sizeof(mallocbuf))); 95 96 /* 97 * Hook up the console 98 */ 99 cons_probe(); 100 101 printf("\n%s", bootprog_info); 102 #if 0 103 printf("Memory: %ld k\n", memsize() / 1024); 104 #endif 105 106 setenv("LINES", "24", 1); /* optional */ 107 108 /* 109 * Set custom environment variables 110 */ 111 i = 0; 112 while (1) { 113 var = CALLBACK(getenv, i++); 114 if (var == NULL) 115 break; 116 putenv(var); 117 } 118 119 archsw.arch_autoload = userboot_autoload; 120 archsw.arch_getdev = userboot_getdev; 121 archsw.arch_copyin = userboot_copyin; 122 archsw.arch_copyout = userboot_copyout; 123 archsw.arch_readin = userboot_readin; 124 #if defined(USERBOOT_ZFS_SUPPORT) 125 archsw.arch_zfs_probe = userboot_zfs_probe; 126 #endif 127 128 /* 129 * Initialise the block cache. Set the upper limit. 130 */ 131 bcache_init(32768, 512); 132 /* 133 * March through the device switch probing for things. 134 */ 135 for (i = 0; devsw[i] != NULL; i++) 136 if (devsw[i]->dv_init != NULL) 137 (devsw[i]->dv_init)(); 138 139 extract_currdev(); 140 141 if (setjmp(jb)) 142 return; 143 144 interact(); /* doesn't return */ 145 146 exit(0); 147 } 148 149 /* 150 * Set the 'current device' by (if possible) recovering the boot device as 151 * supplied by the initial bootstrap. 152 */ 153 static void 154 extract_currdev(void) 155 { 156 struct disk_devdesc dev; 157 struct devdesc *dd; 158 #if defined(USERBOOT_ZFS_SUPPORT) 159 struct zfs_devdesc zdev; 160 161 if (userboot_zfs_found) { 162 163 /* Leave the pool/root guid's unassigned */ 164 bzero(&zdev, sizeof(zdev)); 165 zdev.dd.d_dev = &zfs_dev; 166 167 init_zfs_bootenv(zfs_fmtdev(&zdev)); 168 dd = &zdev.dd; 169 } else 170 #endif 171 172 if (userboot_disk_maxunit > 0) { 173 dev.dd.d_dev = &userboot_disk; 174 dev.dd.d_unit = 0; 175 dev.d_slice = 0; 176 dev.d_partition = 0; 177 /* 178 * If we cannot auto-detect the partition type then 179 * access the disk as a raw device. 180 */ 181 if (dev.dd.d_dev->dv_open(NULL, &dev)) { 182 dev.d_slice = -1; 183 dev.d_partition = -1; 184 } 185 dd = &dev.dd; 186 } else { 187 dev.dd.d_dev = &host_dev; 188 dev.dd.d_unit = 0; 189 dd = &dev.dd; 190 } 191 192 env_setenv("currdev", EV_VOLATILE, userboot_fmtdev(dd), 193 userboot_setcurrdev, env_nounset); 194 env_setenv("loaddev", EV_VOLATILE, userboot_fmtdev(dd), 195 env_noset, env_nounset); 196 } 197 198 #if defined(USERBOOT_ZFS_SUPPORT) 199 static void 200 userboot_zfs_probe(void) 201 { 202 char devname[32]; 203 uint64_t pool_guid; 204 int unit; 205 206 /* 207 * Open all the disks we can find and see if we can reconstruct 208 * ZFS pools from them. Record if any were found. 209 */ 210 for (unit = 0; unit < userboot_disk_maxunit; unit++) { 211 sprintf(devname, "disk%d:", unit); 212 pool_guid = 0; 213 zfs_probe_dev(devname, &pool_guid); 214 if (pool_guid != 0) 215 userboot_zfs_found = 1; 216 } 217 } 218 #endif 219 220 COMMAND_SET(quit, "quit", "exit the loader", command_quit); 221 222 static int 223 command_quit(int argc, char *argv[]) 224 { 225 226 exit(USERBOOT_EXIT_QUIT); 227 return (CMD_OK); 228 } 229 230 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 231 232 static int 233 command_reboot(int argc, char *argv[]) 234 { 235 236 exit(USERBOOT_EXIT_REBOOT); 237 return (CMD_OK); 238 } 239