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Annotation of sys/stand/boot/boot.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: boot.c,v 1.36 2007/06/26 10:34:41 tom Exp $   */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2003 Dale Rahn
        !             5:  * Copyright (c) 1997,1998 Michael Shalayeff
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            19:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  *
        !            29:  */
        !            30:
        !            31: #include <sys/param.h>
        !            32: #include <sys/reboot.h>
        !            33: #include <sys/stat.h>
        !            34: #include <libsa.h>
        !            35: #include <lib/libsa/loadfile.h>
        !            36: #include <lib/libkern/funcs.h>
        !            37:
        !            38: #include "cmd.h"
        !            39:
        !            40: #ifndef KERNEL
        !            41: #define KERNEL "/bsd"
        !            42: #endif
        !            43:
        !            44: char prog_ident[40];
        !            45: char *progname = "BOOT";
        !            46:
        !            47: extern const char version[];
        !            48: struct cmd_state cmd;
        !            49:
        !            50: /* bootprompt can be set by MD code to avoid prompt first time round */
        !            51: int bootprompt = 1;
        !            52: char *kernelfile = KERNEL;             /* can be changed by MD code */
        !            53:
        !            54: void
        !            55: boot(dev_t bootdev)
        !            56: {
        !            57:        int fd;
        !            58:        int try = 0, st;
        !            59:        u_long marks[MARK_MAX];
        !            60:
        !            61:        machdep();
        !            62:
        !            63:        snprintf(prog_ident, sizeof(prog_ident),
        !            64:            ">> OpenBSD/" MACHINE " %s %s", progname, version);
        !            65:        printf("%s\n", prog_ident);
        !            66:
        !            67:        devboot(bootdev, cmd.bootdev);
        !            68:        strlcpy(cmd.image, kernelfile, sizeof(cmd.image));
        !            69:        cmd.boothowto = 0;
        !            70:        cmd.conf = "/etc/boot.conf";
        !            71:        cmd.addr = (void *)DEFAULT_KERNEL_ADDRESS;
        !            72:        cmd.timeout = 5;
        !            73:
        !            74:        st = read_conf();
        !            75:        if (!bootprompt)
        !            76:                snprintf(cmd.path, sizeof cmd.path, "%s:%s",
        !            77:                    cmd.bootdev, cmd.image);
        !            78:
        !            79:        while (1) {
        !            80:                /* no boot.conf, or no boot cmd in there */
        !            81:                if (bootprompt && st <= 0)
        !            82:                        do {
        !            83:                                printf("boot> ");
        !            84:                        } while(!getcmd());
        !            85:                st = 0;
        !            86:                bootprompt = 1; /* allow reselect should we fail */
        !            87:
        !            88:                printf("booting %s: ", cmd.path);
        !            89:                marks[MARK_START] = (u_long)cmd.addr;
        !            90:                if ((fd = loadfile(cmd.path, marks, LOAD_ALL)) != -1) {
        !            91:                        close(fd);
        !            92:                        break;
        !            93:                }
        !            94:
        !            95:                kernelfile = KERNEL;
        !            96:                try++;
        !            97:                strlcpy(cmd.image, kernelfile, sizeof(cmd.image));
        !            98:                printf(" failed(%d). will try %s\n", errno, kernelfile);
        !            99:
        !           100:                if (try < 2) {
        !           101:                        if (cmd.timeout > 0)
        !           102:                                cmd.timeout++;
        !           103:                } else {
        !           104:                        if (cmd.timeout)
        !           105:                                printf("Turning timeout off.\n");
        !           106:                        cmd.timeout = 0;
        !           107:                }
        !           108:        }
        !           109:
        !           110:        /* exec */
        !           111:        run_loadfile(marks, cmd.boothowto);
        !           112: }
        !           113:
        !           114: #ifdef _TEST
        !           115: int
        !           116: main()
        !           117: {
        !           118:        boot(0);
        !           119:        return 0;
        !           120: }
        !           121: #endif