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-rw-r--r--stand/common/boot.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/stand/common/boot.c b/stand/common/boot.c
new file mode 100644
index 000000000000..5ee95215283c
--- /dev/null
+++ b/stand/common/boot.c
@@ -0,0 +1,410 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Loading modules, booting the system
+ */
+
+#include <stand.h>
+#include <string.h>
+
+#include "bootstrap.h"
+
+static char *getbootfile(int try);
+static int loadakernel(int try, int argc, char* argv[]);
+
+/* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
+static const char *default_bootfiles = "kernel";
+
+static int autoboot_tried;
+
+/*
+ * The user wants us to boot.
+ */
+COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
+
+static int
+command_boot(int argc, char *argv[])
+{
+ struct preloaded_file *fp;
+
+ /*
+ * See if the user has specified an explicit kernel to boot.
+ */
+ if ((argc > 1) && (argv[1][0] != '-')) {
+
+ /* XXX maybe we should discard everything and start again? */
+ if (file_findfile(NULL, NULL) != NULL) {
+ snprintf(command_errbuf, sizeof(command_errbuf),
+ "can't boot '%s', kernel module already loaded", argv[1]);
+ return(CMD_ERROR);
+ }
+
+ /* find/load the kernel module */
+ if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
+ return(CMD_ERROR);
+ /* we have consumed all arguments */
+ argc = 1;
+ }
+
+ /*
+ * See if there is a kernel module already loaded
+ */
+ if (file_findfile(NULL, NULL) == NULL)
+ if (loadakernel(0, argc - 1, argv + 1))
+ /* we have consumed all arguments */
+ argc = 1;
+
+ /*
+ * Loaded anything yet?
+ */
+ if ((fp = file_findfile(NULL, NULL)) == NULL) {
+ command_errmsg = "no bootable kernel";
+ return(CMD_ERROR);
+ }
+
+ /*
+ * If we were given arguments, discard any previous.
+ * XXX should we merge arguments? Hard to DWIM.
+ */
+ if (argc > 1) {
+ if (fp->f_args != NULL)
+ free(fp->f_args);
+ fp->f_args = unargv(argc - 1, argv + 1);
+ }
+
+ /* Hook for platform-specific autoloading of modules */
+ if (archsw.arch_autoload() != 0)
+ return(CMD_ERROR);
+
+ /* Call the exec handler from the loader matching the kernel */
+ file_formats[fp->f_loader]->l_exec(fp);
+ return(CMD_ERROR);
+}
+
+
+/*
+ * Autoboot after a delay
+ */
+
+COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
+
+static int
+command_autoboot(int argc, char *argv[])
+{
+ int howlong;
+ char *cp, *prompt;
+
+ prompt = NULL;
+ howlong = -1;
+ switch(argc) {
+ case 3:
+ prompt = argv[2];
+ /* FALLTHROUGH */
+ case 2:
+ howlong = strtol(argv[1], &cp, 0);
+ if (*cp != 0) {
+ snprintf(command_errbuf, sizeof(command_errbuf),
+ "bad delay '%s'", argv[1]);
+ return(CMD_ERROR);
+ }
+ /* FALLTHROUGH */
+ case 1:
+ return(autoboot(howlong, prompt));
+ }
+
+ command_errmsg = "too many arguments";
+ return(CMD_ERROR);
+}
+
+/*
+ * Called before we go interactive. If we think we can autoboot, and
+ * we haven't tried already, try now.
+ */
+void
+autoboot_maybe()
+{
+ char *cp;
+
+ cp = getenv("autoboot_delay");
+ if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
+ autoboot(-1, NULL); /* try to boot automatically */
+}
+
+int
+autoboot(int timeout, char *prompt)
+{
+ time_t when, otime, ntime;
+ int c, yes;
+ char *argv[2], *cp, *ep;
+ char *kernelname;
+#ifdef BOOT_PROMPT_123
+ const char *seq = "123", *p = seq;
+#endif
+
+ autoboot_tried = 1;
+
+ if (timeout == -1) {
+ timeout = 10;
+ /* try to get a delay from the environment */
+ if ((cp = getenv("autoboot_delay"))) {
+ timeout = strtol(cp, &ep, 0);
+ if (cp == ep)
+ timeout = 10; /* Unparseable? Set default! */
+ }
+ }
+
+ kernelname = getenv("kernelname");
+ if (kernelname == NULL) {
+ argv[0] = NULL;
+ loadakernel(0, 0, argv);
+ kernelname = getenv("kernelname");
+ if (kernelname == NULL) {
+ command_errmsg = "no valid kernel found";
+ return(CMD_ERROR);
+ }
+ }
+
+ if (timeout >= 0) {
+ otime = time(NULL);
+ when = otime + timeout; /* when to boot */
+
+ yes = 0;
+
+#ifdef BOOT_PROMPT_123
+ printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or "
+ "1 2 3 sequence for command prompt." : prompt);
+#else
+ printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
+#endif
+
+ for (;;) {
+ if (ischar()) {
+ c = getchar();
+#ifdef BOOT_PROMPT_123
+ if ((c == '\r') || (c == '\n')) {
+ yes = 1;
+ break;
+ } else if (c != *p++)
+ p = seq;
+ if (*p == 0)
+ break;
+#else
+ if ((c == '\r') || (c == '\n'))
+ yes = 1;
+ break;
+#endif
+ }
+ ntime = time(NULL);
+ if (ntime >= when) {
+ yes = 1;
+ break;
+ }
+
+ if (ntime != otime) {
+ printf("\rBooting [%s] in %d second%s... ",
+ kernelname, (int)(when - ntime),
+ (when-ntime)==1?"":"s");
+ otime = ntime;
+ }
+ }
+ } else {
+ yes = 1;
+ }
+
+ if (yes)
+ printf("\rBooting [%s]... ", kernelname);
+ putchar('\n');
+ if (yes) {
+ argv[0] = "boot";
+ argv[1] = NULL;
+ return(command_boot(1, argv));
+ }
+ return(CMD_OK);
+}
+
+/*
+ * Scrounge for the name of the (try)'th file we will try to boot.
+ */
+static char *
+getbootfile(int try)
+{
+ static char *name = NULL;
+ const char *spec, *ep;
+ size_t len;
+
+ /* we use dynamic storage */
+ if (name != NULL) {
+ free(name);
+ name = NULL;
+ }
+
+ /*
+ * Try $bootfile, then try our builtin default
+ */
+ if ((spec = getenv("bootfile")) == NULL)
+ spec = default_bootfiles;
+
+ while ((try > 0) && (spec != NULL)) {
+ spec = strchr(spec, ';');
+ if (spec)
+ spec++; /* skip over the leading ';' */
+ try--;
+ }
+ if (spec != NULL) {
+ if ((ep = strchr(spec, ';')) != NULL) {
+ len = ep - spec;
+ } else {
+ len = strlen(spec);
+ }
+ name = malloc(len + 1);
+ strncpy(name, spec, len);
+ name[len] = 0;
+ }
+ if (name && name[0] == 0) {
+ free(name);
+ name = NULL;
+ }
+ return(name);
+}
+
+/*
+ * Try to find the /etc/fstab file on the filesystem (rootdev),
+ * which should be be the root filesystem, and parse it to find
+ * out what the kernel ought to think the root filesystem is.
+ *
+ * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
+ * so that the kernel can tell both which VFS and which node to use
+ * to mount the device. If this variable's already set, don't
+ * overwrite it.
+ */
+int
+getrootmount(char *rootdev)
+{
+ char lbuf[128], *cp, *ep, *dev, *fstyp, *options;
+ int fd, error;
+
+ if (getenv("vfs.root.mountfrom") != NULL)
+ return(0);
+
+ error = 1;
+ sprintf(lbuf, "%s/etc/fstab", rootdev);
+ if ((fd = open(lbuf, O_RDONLY)) < 0)
+ goto notfound;
+
+ /* loop reading lines from /etc/fstab What was that about sscanf again? */
+ while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
+ if ((lbuf[0] == 0) || (lbuf[0] == '#'))
+ continue;
+
+ /* skip device name */
+ for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
+ ;
+ if (*cp == 0) /* misformatted */
+ continue;
+ /* delimit and save */
+ *cp++ = 0;
+ dev = strdup(lbuf);
+
+ /* skip whitespace up to mountpoint */
+ while ((*cp != 0) && isspace(*cp))
+ cp++;
+ /* must have /<space> to be root */
+ if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
+ continue;
+ /* skip whitespace up to fstype */
+ cp += 2;
+ while ((*cp != 0) && isspace(*cp))
+ cp++;
+ if (*cp == 0) /* misformatted */
+ continue;
+ /* skip text to end of fstype and delimit */
+ ep = cp;
+ while ((*cp != 0) && !isspace(*cp))
+ cp++;
+ *cp = 0;
+ fstyp = strdup(ep);
+
+ /* skip whitespace up to mount options */
+ cp += 1;
+ while ((*cp != 0) && isspace(*cp))
+ cp++;
+ if (*cp == 0) /* misformatted */
+ continue;
+ /* skip text to end of mount options and delimit */
+ ep = cp;
+ while ((*cp != 0) && !isspace(*cp))
+ cp++;
+ *cp = 0;
+ options = strdup(ep);
+ /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */
+ sprintf(lbuf, "%s:%s", fstyp, dev);
+ free(dev);
+ free(fstyp);
+ setenv("vfs.root.mountfrom", lbuf, 0);
+
+ /* Don't override vfs.root.mountfrom.options if it is already set */
+ if (getenv("vfs.root.mountfrom.options") == NULL) {
+ /* save mount options */
+ setenv("vfs.root.mountfrom.options", options, 0);
+ }
+ free(options);
+ error = 0;
+ break;
+ }
+ close(fd);
+
+notfound:
+ if (error) {
+ const char *currdev;
+
+ currdev = getenv("currdev");
+ if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) {
+ cp = strdup(currdev);
+ cp[strlen(cp) - 1] = '\0';
+ setenv("vfs.root.mountfrom", cp, 0);
+ error = 0;
+ }
+ }
+
+ return(error);
+}
+
+static int
+loadakernel(int try, int argc, char* argv[])
+{
+ char *cp;
+
+ for (try = 0; (cp = getbootfile(try)) != NULL; try++)
+ if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
+ printf("can't load '%s'\n", cp);
+ else
+ return 1;
+ return 0;
+}
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