wok annotate syslinux/stuff/iso2exe/boot.c @ rev 17491

syslinux/iso2exe: speedup crc
author Pascal Bellard <pascal.bellard@slitaz.org>
date Fri Jan 02 21:46:16 2015 +0100 (2015-01-02)
parents 054f70cb9bec
children aa46cf9cc35a
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@17489 13 [initrd=<rootfs>[,<rootfs2>...]] [bootfrom=<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@17489 16 bootfrom=\\isos\\slitaz-4.0.iso\n\
pascal@13691 17 kernel=boot/bzImage\n\
pascal@16012 18 initrd=boot/rootfs4.gz,boot/rootfs3.gz,boot/rootfs2.gz,boot/rootfs1.gz,\\slitaz\\extrafs.gz\n\
pascal@13691 19 rw root=/dev/null vga=normal autologin\n\n\
pascal@17491 20 kernel=\\slitaz\\elks\n\
pascal@17491 21 root=/dev/bda1 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@16025 27 char *init = " rdinit=/init.exe", *mode="menu", *fmt="";
pascal@17489 28 char *s, c, rootfs[16], fallback[16], cmdline[256];
pascal@17489 29 int restart, isknoppix = 0;
pascal@13691 30 unsigned long magic;
pascal@13691 31
pascal@17489 32 if (isoreset(*iso)) return;
pascal@17489 33 !isoopen("boot") ||
pascal@17489 34 !isoopen("live") || // debian
pascal@17489 35 !isoopen("casper") || // ubuntu
pascal@17489 36 !isoopen("isolinux"); // zeroshell
pascal@13691 37 if (iso[1] && !strcmp(mode = iso[1], "text"))
pascal@13691 38 init = "";
pascal@17489 39 do {
pascal@17489 40 if (!isoopen(mode) || // custom
pascal@17489 41 !isoopen("bzImage") || // SliTaz
pascal@17489 42 !isoopen("vmlinuz") || // misc
pascal@17489 43 (!isoopen("linux") && ++isknoppix)) {
pascal@17489 44 magic = loadkernel();
pascal@17489 45 break;
pascal@17489 46 }
pascal@17489 47 } while (!isoopen("isolinux")); // Knoppix
pascal@17489 48 fallback[0] = 0;
pascal@13691 49 for (c = 0, restart = 1; isoreaddir(restart) == 0; restart = 0) {
pascal@17489 50 if (strstr(isofilename, ".gz"))
pascal@17489 51 strcpy(fallback, isofilename);
pascal@16002 52 if (strncmp(isofilename, "rootfs", 6)
pascal@16002 53 || c > isofilename[6]) continue;
pascal@13691 54 strcpy(rootfs, isofilename);
pascal@16002 55 c = isofilename[6];
pascal@13691 56 }
pascal@17489 57
pascal@16025 58 if (magic < 0x20630)
pascal@14257 59 init = ""; // Does not support multiple initramfs
pascal@17489 60
pascal@16025 61 if (magic > 0) {
pascal@17489 62 char *initrd = fallback;
pascal@17489 63
pascal@17489 64 fmt = "rw root=/dev/null bootfrom=%s%s magic=%lu mode=%s autologin";
pascal@17489 65 if (rootfs[0]) {
pascal@17489 66 initrd = rootfs;
pascal@17489 67 if (rootfs[6] != '.' && !isoopen("rootfs.gz"))
pascal@17489 68 loadinitrd(); // for loram
pascal@17489 69 }
pascal@17489 70 if (!isoopen(initrd)) {
pascal@17489 71 loadinitrd();
pascal@17489 72 }
pascal@16025 73 if (*init) {
pascal@16025 74 lseek(isofd, 24L, SEEK_SET);
pascal@16025 75 read(isofd, &magic, 4);
pascal@16025 76 isofilesize = magic & 0xFFFFL;
pascal@16025 77 isofileofs = 0x7EE0L - isofilesize;
pascal@16025 78 if (isofilesize) loadinitrd();
pascal@16025 79 else init="";
pascal@16025 80 }
pascal@16025 81 }
pascal@17489 82 if (isknoppix) {
pascal@17489 83 if (iso[0][1] == ':')
pascal@17489 84 *iso += 2;
pascal@17489 85 for (s = *iso; *s; s++)
pascal@17489 86 if (*s == '\\') *s = '/';
pascal@17489 87 }
pascal@17489 88 sprintf(cmdline, fmt, *iso, init, magic, mode);
pascal@13691 89 close(isofd);
pascal@13691 90 bootlinux(cmdline);
pascal@13691 91 }
pascal@13691 92
pascal@13691 93 static int stricmp(char *ref, char *s)
pascal@13691 94 {
pascal@13691 95 char c;
pascal@13691 96 while (*ref) {
pascal@13691 97 c = *s++;
pascal@13691 98 if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
pascal@13691 99 c -= *ref++;
pascal@13691 100 if (c) return c;
pascal@13691 101 }
pascal@13691 102 return 0;
pascal@13691 103 }
pascal@13691 104
pascal@16022 105 static int chkstatus(int status, char *name)
pascal@16022 106 {
pascal@16022 107 if (status == -1)
pascal@16022 108 printf("%s not found.\n",name);
pascal@16022 109 return status;
pascal@16022 110 }
pascal@16022 111
pascal@13691 112 static char *iso;
pascal@13691 113 static int fakeopen(char *file)
pascal@13691 114 {
pascal@16002 115 if (file) {
pascal@16002 116 char *s = file;
pascal@16002 117 while (*s && *s != '\r' && *s != '\n') s++;
pascal@16002 118 *s = 0;
pascal@16002 119 }
pascal@16012 120 if (*file == '\\') {
pascal@16012 121 static fd = -1;
pascal@16012 122 if (fd >= 0) close(fd);
pascal@16022 123 fd = chkstatus(open(file, O_RDONLY), file);
pascal@16022 124 return fd;
pascal@16012 125 }
pascal@13691 126 if (iso) {
pascal@16022 127 chkstatus(isoreset(iso), iso);
pascal@16022 128 return chkstatus(isoopen(file), file);
pascal@13691 129 }
pascal@13691 130 close(isofd);
pascal@16022 131 isofd = chkstatus(open(file, O_RDONLY), file);
pascal@13691 132 if (isofd != -1) {
pascal@13691 133 isofileofs = 0;
pascal@13691 134 isofilesize = LONG_MAX;
pascal@13691 135 }
pascal@13691 136 return isofd;
pascal@13691 137 }
pascal@13691 138
pascal@13691 139 static char args[2048];
pascal@13691 140 int main(int argc, char *argv[])
pascal@13691 141 {
pascal@13691 142 char *kernel, *initrd, *cmdline, *cmdfile, *s;
pascal@13691 143
pascal@13691 144 argv[0] = progname();
pascal@14268 145 bootiso(argv); // iso ? parsing is /init.exe stuff !
pascal@16022 146 if (argc >= 2)
pascal@14268 147 bootiso(argv + 1);
pascal@13691 148
pascal@13691 149 chdirname(*argv);
pascal@13691 150 cmdfile = "tazboot.cmd";
pascal@13691 151 kernel = "bzImage";
pascal@13691 152 initrd = NULL;
pascal@13691 153 cmdline = "auto";
pascal@13691 154 if (argc > 1) {
pascal@13691 155 if (argv[1][0] == '@')
pascal@13691 156 cmdfile = argv[1] + 1;
pascal@13691 157 else {
pascal@13691 158 cmdfile = NULL;
pascal@13691 159 #asm
pascal@13691 160 push ds
pascal@13691 161 pop es
pascal@13691 162 mov si, #0x82
pascal@13691 163 mov di, #_args
pascal@13691 164 mov cx, #0x7E/2
pascal@13691 165 rep
pascal@13697 166 seg cs
pascal@13691 167 movsw
pascal@13691 168 #endasm
pascal@13691 169 }
pascal@13691 170 }
pascal@13691 171 if (cmdfile) {
pascal@13691 172 int fd;
pascal@16025 173 fd = chkstatus(open(cmdfile, O_RDONLY), cmdfile);
pascal@13691 174 if (fd != -1) {
pascal@13691 175 read(fd, args, sizeof(args));
pascal@13691 176 close(fd);
pascal@13691 177 for (s = args; s < args + sizeof(args) -1; s++) {
pascal@13691 178 if (*s == '\r') *s++ = ' ';
pascal@13691 179 if (*s == '\n') *s = ' ';
pascal@13691 180 }
pascal@13691 181 }
pascal@13691 182 }
pascal@13691 183 for (s = args; s < args + sizeof(args); s++) {
pascal@13691 184 if (*s == ' ') continue;
pascal@13691 185 if (stricmp("kernel=", s) == 0)
pascal@13691 186 kernel = s + 7;
pascal@13691 187 else if (stricmp("initrd=", s) == 0)
pascal@13691 188 initrd = s + 7;
pascal@17489 189 else if (stricmp("bootfrom=", s) == 0)
pascal@13691 190 iso = s + 4;
pascal@13691 191 else {
pascal@13691 192 cmdline = s;
pascal@13691 193 break;
pascal@13691 194 }
pascal@13691 195 while (*s && *s != ' ') s++;
pascal@13691 196 *s = 0;
pascal@13691 197 }
pascal@16002 198 if (cmdline) {
pascal@16002 199 char *last;
pascal@16002 200 for (s = cmdline; *s && *s != '\r' && *s != '\n'; s++)
pascal@16002 201 if (*s != ' ') last = s;
pascal@16002 202 *++last = 0;
pascal@16002 203 }
pascal@13691 204 if (fakeopen(kernel) == -1)
pascal@13691 205 usage(argv[0]);
pascal@13691 206 loadkernel();
pascal@13691 207 if (initrd) {
pascal@13691 208 char *p, *q = initrd;
pascal@13691 209 while (1) {
pascal@13691 210 char c;
pascal@13691 211 for (p = q; *p && *p != ','; p++);
pascal@13691 212 c = *p;
pascal@13691 213 *p = 0;
pascal@13691 214 if (fakeopen(q) != -1)
pascal@13691 215 loadinitrd();
pascal@13691 216 if (c == 0)
pascal@13691 217 break;
pascal@13691 218 q = ++p;
pascal@13691 219 }
pascal@13691 220 }
pascal@13691 221 bootlinux(cmdline);
pascal@13691 222 }