arch/cris/boot/tools/build.c

   1 /*
   2  *  linux/tools/build.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * This file builds a disk-image from three different files:
   9  *
  10  * - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
  11  * - setup: 8086 machine code, sets up system parm
  12  * - system: 80386 code for actual system
  13  *
  14  * It does some checking that all files are of the correct type, and
  15  * just writes the result to stdout, removing headers and padding to
  16  * the right amount. It also writes some system data to stderr.
  17  */
  18
  19 /*
  20  * Changes by tytso to allow root device specification
  21  * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
  22  * Cross compiling fixes by Gertjan van Wingerde, July 1996
  23  */
  24
  25 #include <stdio.h>      /* fprintf */
  26 #include <string.h>
  27 #include <stdlib.h>     /* contains exit */
  28 #include <sys/types.h>  /* unistd.h needs this */
  29 #include <sys/stat.h>
  30 #include <sys/sysmacros.h>
  31 #include <unistd.h>     /* contains read/write */
  32 #include <fcntl.h>
  33 #include <errno.h>
  34
  35 #define MINIX_HEADER 32
  36
  37 #define N_MAGIC_OFFSET 1024
  38 #ifndef __BFD__
  39 static int GCC_HEADER = sizeof(struct exec);
  40 #endif
  41
  42 #ifdef __BIG_KERNEL__
  43 #define SYS_SIZE 0xffff
  44 #else
  45 #define SYS_SIZE DEF_SYSSIZE
  46 #endif
  47
  48 #define DEFAULT_MAJOR_ROOT 0
  49 #define DEFAULT_MINOR_ROOT 0
  50
  51 /* max nr of sectors of setup: don't change unless you also change
  52  * bootsect etc */
  53 #define SETUP_SECTS 4
  54
  55 #define STRINGIFY(x) #x
  56
  57 typedef union {
  58         int i;
  59         long l;
  60         short s[2];
  61         char b[4];
  62 } conv;
  63
  64 long intel_long(long l)
  65 {
  66         conv t;
  67
  68         t.b[0] = l & 0xff; l >>= 8;
  69         t.b[1] = l & 0xff; l >>= 8;
  70         t.b[2] = l & 0xff; l >>= 8;
  71         t.b[3] = l & 0xff; l >>= 8;
  72         return t.l;
  73 }
  74
  75 int intel_int(int i)
  76 {
  77         conv t;
  78
  79         t.b[0] = i & 0xff; i >>= 8;
  80         t.b[1] = i & 0xff; i >>= 8;
  81         t.b[2] = i & 0xff; i >>= 8;
  82         t.b[3] = i & 0xff; i >>= 8;
  83         return t.i;
  84 }
  85
  86 short intel_short(short l)
  87 {
  88         conv t;
  89
  90         t.b[0] = l & 0xff; l >>= 8;
  91         t.b[1] = l & 0xff; l >>= 8;
  92         return t.s[0];
  93 }
  94
  95 void die(const char * str)
  96 {
  97         fprintf(stderr,"%s\n",str);
  98         exit(1);
  99 }
 100
 101 void usage(void)
 102 {
 103         die("Usage: build bootsect setup system [rootdev] [> image]");
 104 }
 105
 106 int main(int argc, char ** argv)
 107 {
 108         int i,c,id,sz,tmp_int;
 109         unsigned long sys_size, tmp_long;
 110         char buf[1024];
 111 #ifndef __BFD__
 112         struct exec *ex = (struct exec *)buf;
 113 #endif
 114         char major_root, minor_root;
 115         struct stat sb;
 116         unsigned char setup_sectors;
 117
 118         if ((argc < 4) || (argc > 5))
 119                 usage();
 120         if (argc > 4) {
 121                 if (!strcmp(argv[4], "CURRENT")) {
 122                         if (stat("/", &sb)) {
 123                                 perror("/");
 124                                 die("Couldn't stat /");
 125                         }
 126                         major_root = major(sb.st_dev);
 127                         minor_root = minor(sb.st_dev);
 128                 } else if (strcmp(argv[4], "FLOPPY")) {
 129                         if (stat(argv[4], &sb)) {
 130                                 perror(argv[4]);
 131                                 die("Couldn't stat root device.");
 132                         }
 133                         major_root = major(sb.st_rdev);
 134                         minor_root = minor(sb.st_rdev);
 135                 } else {
 136                         major_root = 0;
 137                         minor_root = 0;
 138                 }
 139         } else {
 140                 major_root = DEFAULT_MAJOR_ROOT;
 141                 minor_root = DEFAULT_MINOR_ROOT;
 142         }
 143         fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
 144         for (i=0;i<sizeof buf; i++) buf[i]=0;
 145         if ((id=open(argv[1],O_RDONLY,0))<0)
 146                 die("Unable to open 'boot'");
 147         if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 148                 die("Unable to read header of 'boot'");
 149         if (((long *) buf)[0]!=intel_long(0x04100301))
 150                 die("Non-Minix header of 'boot'");
 151         if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 152                 die("Non-Minix header of 'boot'");
 153         if (((long *) buf)[3] != 0)
 154                 die("Illegal data segment in 'boot'");
 155         if (((long *) buf)[4] != 0)
 156                 die("Illegal bss in 'boot'");
 157         if (((long *) buf)[5] != 0)
 158                 die("Non-Minix header of 'boot'");
 159         if (((long *) buf)[7] != 0)
 160                 die("Illegal symbol table in 'boot'");
 161         i=read(id,buf,sizeof buf);
 162         fprintf(stderr,"Boot sector %d bytes.\n",i);
 163         if (i != 512)
 164                 die("Boot block must be exactly 512 bytes");
 165         if ((*(unsigned short *)(buf+510)) != (unsigned short)intel_short(0xAA55))
 166                 die("Boot block hasn't got boot flag (0xAA55)");
 167         buf[508] = (char) minor_root;
 168         buf[509] = (char) major_root;
 169         i=write(1,buf,512);
 170         if (i!=512)
 171                 die("Write call failed");
 172         close (id);
 173
 174         if ((id=open(argv[2],O_RDONLY,0))<0)
 175                 die("Unable to open 'setup'");
 176         if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 177                 die("Unable to read header of 'setup'");
 178         if (((long *) buf)[0]!=intel_long(0x04100301))
 179                 die("Non-Minix header of 'setup'");
 180         if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 181                 die("Non-Minix header of 'setup'");
 182         if (((long *) buf)[3] != 0)
 183                 die("Illegal data segment in 'setup'");
 184         if (((long *) buf)[4] != 0)
 185                 die("Illegal bss in 'setup'");
 186         if (((long *) buf)[5] != 0)
 187                 die("Non-Minix header of 'setup'");
 188         if (((long *) buf)[7] != 0)
 189                 die("Illegal symbol table in 'setup'");
 190         for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
 191 #ifdef __BIG_KERNEL__
 192         {
 193                 if (!i) {
 194                         /* Working with memcpy because of alignment constraints
 195                            on Sparc - Gertjan */
 196                         memcpy(&tmp_long, &buf[2], sizeof(long));
 197                         if (tmp_long != intel_long(0x53726448) )
 198                                 die("Wrong magic in loader header of 'setup'");
 199                         memcpy(&tmp_int, &buf[6], sizeof(int));
 200                         if (tmp_int < intel_int(0x200))
 201                                 die("Wrong version of loader header of 'setup'");
 202                         buf[0x11] = 1; /* LOADED_HIGH */
 203                         tmp_long = intel_long(0x100000);
 204                         memcpy(&buf[0x14], &tmp_long, sizeof(long));  /* code32_start */
 205                 }
 206 #endif
 207                 if (write(1,buf,c)!=c)
 208                         die("Write call failed");
 209 #ifdef __BIG_KERNEL__
 210         }
 211 #endif
 212         if (c != 0)
 213                 die("read-error on 'setup'");
 214         close (id);
 215         setup_sectors = (unsigned char)((i + 511) / 512);
 216         /* for compatibility with LILO */
 217         if (setup_sectors < SETUP_SECTS)
 218                 setup_sectors = SETUP_SECTS;
 219         fprintf(stderr,"Setup is %d bytes.\n",i);
 220         for (c=0 ; c<sizeof(buf) ; c++)
 221                 buf[c] = '\0';
 222         while (i < setup_sectors * 512) {
 223                 c = setup_sectors * 512 - i;
 224                 if (c > sizeof(buf))
 225                         c = sizeof(buf);
 226                 if (write(1,buf,c) != c)
 227                         die("Write call failed");
 228                 i += c;
 229         }
 230
 231         if ((id=open(argv[3],O_RDONLY,0))<0)
 232                 die("Unable to open 'system'");
 233 #ifndef __BFD__
 234         if (read(id,buf,GCC_HEADER) != GCC_HEADER)
 235                 die("Unable to read header of 'system'");
 236         if (N_MAGIC(*ex) == ZMAGIC) {
 237                 GCC_HEADER = N_MAGIC_OFFSET;
 238                 lseek(id, GCC_HEADER, SEEK_SET);
 239         } else if (N_MAGIC(*ex) != QMAGIC)
 240                 die("Non-GCC header of 'system'");
 241         fprintf(stderr,"System is %d kB (%d kB code, %d kB data and %d kB bss)\n",
 242                 (ex->a_text+ex->a_data+ex->a_bss)/1024,
 243                 ex->a_text /1024,
 244                 ex->a_data /1024,
 245                 ex->a_bss  /1024);
 246         sz = N_SYMOFF(*ex) - GCC_HEADER + 4;
 247 #else
 248         if (fstat (id, &sb)) {
 249           perror ("fstat");
 250           die ("Unable to stat 'system'");
 251         }
 252         sz = sb.st_size;
 253         fprintf (stderr, "System is %d kB\n", sz/1024);
 254 #endif
 255         sys_size = (sz + 15) / 16;
 256         if (sys_size > SYS_SIZE)
 257                 die("System is too big");
 258         while (sz > 0) {
 259                 int l, n;
 260
 261                 l = sz;
 262                 if (l > sizeof(buf))
 263                         l = sizeof(buf);
 264                 if ((n=read(id, buf, l)) != l) {
 265                         if (n == -1)
 266                                 perror(argv[1]);
 267                         else
 268                                 fprintf(stderr, "Unexpected EOF\n");
 269                         die("Can't read 'system'");
 270                 }
 271                 if (write(1, buf, l) != l)
 272                         die("Write failed");
 273                 sz -= l;
 274         }
 275         close(id);
 276         if (lseek(1, 497, 0) == 497) {
 277                 if (write(1, &setup_sectors, 1) != 1)
 278                         die("Write of setup sectors failed");
 279         }
 280         if (lseek(1,500,0) == 500) {
 281                 buf[0] = (sys_size & 0xff);
 282                 buf[1] = ((sys_size >> 8) & 0xff);
 283                 if (write(1, buf, 2) != 2)
 284                         die("Write failed");
 285         }
 286         return(0);
 287 }