wok-current annotate syslinux/stuff/iso2exe/boot.c @ rev 14257

syslinux/iso2exe: check kernel version, add floppy bootstrap stub
author Pascal Bellard <pascal.bellard@slitaz.org>
date Thu Mar 28 11:51:42 2013 +0100 (2013-03-28)
parents b5ea41033c21
children bf8be127c60b
rev   line source
pascal@13691 1 #include <asm/limits.h>
pascal@13691 2 #include <sys/types.h>
pascal@13691 3 #include <unistd.h>
pascal@13691 4 #include <fcntl.h>
pascal@13691 5 #include <stdio.h>
pascal@13691 6 #include "iso9660.h"
pascal@13691 7 #include "bootlinux.h"
pascal@13691 8 #include "libdos.h"
pascal@13691 9
pascal@13691 10 static void usage(char *iso)
pascal@13691 11 {
pascal@13691 12 printf("Usage: %s [[@commands]|[kernel=<bzimage>] \
pascal@13691 13 [initrd=<rootfs>[,<rootfs2>...]] [iso=<isofile>] ...]\n\n\
pascal@13691 14 Defaults: %s @tazboot.cmd or %s kernel=bzImage auto\n\n\
pascal@13691 15 Examples for tazboot.cmd:\n\n\
pascal@13691 16 iso=\\isos\\slitaz-4.0.iso\n\
pascal@13691 17 kernel=boot/bzImage\n\
pascal@13691 18 initrd=boot/rootfs4.gz,boot/rootfs3.gz,boot/rootfs2.gz,boot/rootfs1.gz\n\
pascal@13691 19 rw root=/dev/null vga=normal autologin\n\n\
pascal@13691 20 kernel=\\slitaz\\vmlinuz\n\
pascal@13691 21 root=/dev/sda5 ro\n",iso,iso,iso);
pascal@13691 22 exit(1);
pascal@13691 23 }
pascal@13691 24
pascal@13691 25 static void bootiso(char **iso)
pascal@13691 26 {
pascal@13691 27 char *init = "rdinit=/init.exe", *mode="menu";
pascal@13691 28 char c, *s, rootfs[16], cmdline[256];
pascal@13691 29 int fd, restart;
pascal@13691 30 unsigned long magic;
pascal@13691 31
pascal@13691 32 if (isoreset(*iso) || isoopen("boot")) return;
pascal@13691 33 if (iso[1] && !strcmp(mode = iso[1], "text"))
pascal@13691 34 init = "";
pascal@13691 35 for (c = 0, restart = 1; isoreaddir(restart) == 0; restart = 0) {
pascal@13691 36 if (strncmp(isofilename, "rootfs", 6) || c > s[6]) continue;
pascal@13691 37 strcpy(rootfs, isofilename);
pascal@13691 38 c = s[6];
pascal@13691 39 }
pascal@13691 40 if (isoopen(mode))
pascal@13691 41 isoopen("bzImage");
pascal@14257 42 if (loadkernel() < 0x20630)
pascal@14257 43 init = ""; // Does not support multiple initramfs
pascal@13691 44 isoopen(rootfs);
pascal@13691 45 loadinitrd();
pascal@13972 46 lseek(isofd, 24, SEEK_SET);
pascal@13691 47 read(isofd, &magic, 4);
pascal@13691 48 isofilesize = magic & 0xFFFF;
pascal@13691 49 isofileofs = 0x8000 - isofilesize;
pascal@13691 50 loadinitrd();
pascal@13691 51 close(isofd);
pascal@13691 52 sprintf(cmdline,"rw root=/dev/null %s iso=%s magic=%lu mode=%s",
pascal@13691 53 init, *iso, magic, mode);
pascal@13691 54 bootlinux(cmdline);
pascal@13691 55 }
pascal@13691 56
pascal@13691 57 static int stricmp(char *ref, char *s)
pascal@13691 58 {
pascal@13691 59 char c;
pascal@13691 60 while (*ref) {
pascal@13691 61 c = *s++;
pascal@13691 62 if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
pascal@13691 63 c -= *ref++;
pascal@13691 64 if (c) return c;
pascal@13691 65 }
pascal@13691 66 return 0;
pascal@13691 67 }
pascal@13691 68
pascal@13691 69 static char *iso;
pascal@13691 70 static int fakeopen(char *file)
pascal@13691 71 {
pascal@13691 72 if (iso) {
pascal@13691 73 isoreset(iso);
pascal@13691 74 return isoopen(file);
pascal@13691 75 }
pascal@13691 76 close(isofd);
pascal@13691 77 isofd = open(file, O_RDONLY);
pascal@13691 78 if (isofd != -1) {
pascal@13691 79 isofileofs = 0;
pascal@13691 80 isofilesize = LONG_MAX;
pascal@13691 81 }
pascal@13691 82 return isofd;
pascal@13691 83 }
pascal@13691 84
pascal@13691 85 static char args[2048];
pascal@13691 86 int main(int argc, char *argv[])
pascal@13691 87 {
pascal@13691 88 char *kernel, *initrd, *cmdline, *cmdfile, *s;
pascal@13691 89
pascal@13691 90 argv[0] = progname();
pascal@14257 91 bootiso(argv + (argc == 2)); // iso ? parsing is /init.exe stuff !
pascal@13691 92
pascal@13691 93 chdirname(*argv);
pascal@13691 94 cmdfile = "tazboot.cmd";
pascal@13691 95 kernel = "bzImage";
pascal@13691 96 initrd = NULL;
pascal@13691 97 cmdline = "auto";
pascal@13691 98 if (argc > 1) {
pascal@13691 99 if (argv[1][0] == '@')
pascal@13691 100 cmdfile = argv[1] + 1;
pascal@13691 101 else {
pascal@13691 102 cmdfile = NULL;
pascal@13691 103 #asm
pascal@13691 104 push ds
pascal@13691 105 pop es
pascal@13691 106 mov si, #0x82
pascal@13691 107 mov di, #_args
pascal@13691 108 mov cx, #0x7E/2
pascal@13691 109 rep
pascal@13697 110 seg cs
pascal@13691 111 movsw
pascal@13691 112 #endasm
pascal@13691 113 }
pascal@13691 114 }
pascal@13691 115 if (cmdfile) {
pascal@13691 116 int fd;
pascal@13691 117 fd = open(cmdfile, O_RDONLY);;
pascal@13691 118 if (fd != -1) {
pascal@13691 119 read(fd, args, sizeof(args));
pascal@13691 120 close(fd);
pascal@13691 121 for (s = args; s < args + sizeof(args) -1; s++) {
pascal@13691 122 if (*s == '\r') *s++ = ' ';
pascal@13691 123 if (*s == '\n') *s = ' ';
pascal@13691 124 }
pascal@13691 125 }
pascal@13691 126 }
pascal@13691 127 for (s = args; s < args + sizeof(args); s++) {
pascal@13691 128 if (*s == ' ') continue;
pascal@13691 129 if (stricmp("kernel=", s) == 0)
pascal@13691 130 kernel = s + 7;
pascal@13691 131 else if (stricmp("initrd=", s) == 0)
pascal@13691 132 initrd = s + 7;
pascal@13691 133 else if (stricmp("iso=", s) == 0)
pascal@13691 134 iso = s + 4;
pascal@13691 135 else {
pascal@13691 136 cmdline = s;
pascal@13691 137 break;
pascal@13691 138 }
pascal@13691 139 while (*s && *s != ' ') s++;
pascal@13691 140 *s = 0;
pascal@13691 141 }
pascal@13691 142 if (fakeopen(kernel) == -1)
pascal@13691 143 usage(argv[0]);
pascal@13691 144 loadkernel();
pascal@13691 145 if (initrd) {
pascal@13691 146 char *p, *q = initrd;
pascal@13691 147 while (1) {
pascal@13691 148 char c;
pascal@13691 149 for (p = q; *p && *p != ','; p++);
pascal@13691 150 c = *p;
pascal@13691 151 *p = 0;
pascal@13691 152 if (fakeopen(q) != -1)
pascal@13691 153 loadinitrd();
pascal@13691 154 if (c == 0)
pascal@13691 155 break;
pascal@13691 156 q = ++p;
pascal@13691 157 }
pascal@13691 158 }
pascal@13691 159 bootlinux(cmdline);
pascal@13691 160 }