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Linux/arch/mn10300/boot/tools/build.c

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  1 /*
  2  *  Copyright (C) 1991, 1992  Linus Torvalds
  3  *  Copyright (C) 1997 Martin Mares
  4  */
  5 
  6 /*
  7  * This file builds a disk-image from three different files:
  8  *
  9  * - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
 10  * - setup: 8086 machine code, sets up system parm
 11  * - system: 80386 code for actual system
 12  *
 13  * It does some checking that all files are of the correct type, and
 14  * just writes the result to stdout, removing headers and padding to
 15  * the right amount. It also writes some system data to stderr.
 16  */
 17 
 18 /*
 19  * Changes by tytso to allow root device specification
 20  * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
 21  * Cross compiling fixes by Gertjan van Wingerde, July 1996
 22  * Rewritten by Martin Mares, April 1997
 23  */
 24 
 25 #include <stdio.h>
 26 #include <string.h>
 27 #include <stdlib.h>
 28 #include <stdarg.h>
 29 #include <sys/types.h>
 30 #include <sys/stat.h>
 31 #include <sys/sysmacros.h>
 32 #include <unistd.h>
 33 #include <fcntl.h>
 34 #include <asm/boot.h>
 35 
 36 #define DEFAULT_MAJOR_ROOT 0
 37 #define DEFAULT_MINOR_ROOT 0
 38 
 39 /* Minimal number of setup sectors (see also bootsect.S) */
 40 #define SETUP_SECTS 4
 41 
 42 uint8_t buf[1024];
 43 int fd;
 44 int is_big_kernel;
 45 
 46 __attribute__((noreturn))
 47 void die(const char *str, ...)
 48 {
 49         va_list args;
 50         va_start(args, str);
 51         vfprintf(stderr, str, args);
 52         fputc('\n', stderr);
 53         exit(1);
 54 }
 55 
 56 void file_open(const char *name)
 57 {
 58         fd = open(name, O_RDONLY, 0);
 59         if (fd < 0)
 60                 die("Unable to open `%s': %m", name);
 61 }
 62 
 63 __attribute__((noreturn))
 64 void usage(void)
 65 {
 66         die("Usage: build [-b] bootsect setup system [rootdev] [> image]");
 67 }
 68 
 69 int main(int argc, char **argv)
 70 {
 71         unsigned int i, c, sz, setup_sectors;
 72         uint32_t sys_size;
 73         uint8_t major_root, minor_root;
 74         struct stat sb;
 75 
 76         if (argc > 2 && !strcmp(argv[1], "-b")) {
 77                 is_big_kernel = 1;
 78                 argc--, argv++;
 79         }
 80         if ((argc < 4) || (argc > 5))
 81                 usage();
 82         if (argc > 4) {
 83                 if (!strcmp(argv[4], "CURRENT")) {
 84                         if (stat("/", &sb)) {
 85                                 perror("/");
 86                                 die("Couldn't stat /");
 87                         }
 88                         major_root = major(sb.st_dev);
 89                         minor_root = minor(sb.st_dev);
 90                 } else if (strcmp(argv[4], "FLOPPY")) {
 91                         if (stat(argv[4], &sb)) {
 92                                 perror(argv[4]);
 93                                 die("Couldn't stat root device.");
 94                         }
 95                         major_root = major(sb.st_rdev);
 96                         minor_root = minor(sb.st_rdev);
 97                 } else {
 98                         major_root = 0;
 99                         minor_root = 0;
100                 }
101         } else {
102                 major_root = DEFAULT_MAJOR_ROOT;
103                 minor_root = DEFAULT_MINOR_ROOT;
104         }
105         fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
106 
107         file_open(argv[1]);
108         i = read(fd, buf, sizeof(buf));
109         fprintf(stderr, "Boot sector %d bytes.\n", i);
110         if (i != 512)
111                 die("Boot block must be exactly 512 bytes");
112         if (buf[510] != 0x55 || buf[511] != 0xaa)
113                 die("Boot block hasn't got boot flag (0xAA55)");
114         buf[508] = minor_root;
115         buf[509] = major_root;
116         if (write(1, buf, 512) != 512)
117                 die("Write call failed");
118         close(fd);
119 
120         /* Copy the setup code */
121         file_open(argv[2]);
122         for (i = 0; (c = read(fd, buf, sizeof(buf))) > 0; i += c)
123                 if (write(1, buf, c) != c)
124                         die("Write call failed");
125         if (c != 0)
126                 die("read-error on `setup'");
127         close(fd);
128 
129         /* Pad unused space with zeros */
130         setup_sectors = (i + 511) / 512;
131         /* for compatibility with ancient versions of LILO. */
132         if (setup_sectors < SETUP_SECTS)
133                 setup_sectors = SETUP_SECTS;
134         fprintf(stderr, "Setup is %d bytes.\n", i);
135         memset(buf, 0, sizeof(buf));
136         while (i < setup_sectors * 512) {
137                 c = setup_sectors * 512 - i;
138                 if (c > sizeof(buf))
139                         c = sizeof(buf);
140                 if (write(1, buf, c) != c)
141                         die("Write call failed");
142                 i += c;
143         }
144 
145         file_open(argv[3]);
146         if (fstat(fd, &sb))
147                 die("Unable to stat `%s': %m", argv[3]);
148         sz = sb.st_size;
149         fprintf(stderr, "System is %d kB\n", sz / 1024);
150         sys_size = (sz + 15) / 16;
151         /* 0x28000*16 = 2.5 MB, conservative estimate for the current maximum */
152         if (sys_size > (is_big_kernel ? 0x28000 : DEF_SYSSIZE))
153                 die("System is too big. Try using %smodules.",
154                         is_big_kernel ? "" : "bzImage or ");
155         if (sys_size > 0xffff)
156                 fprintf(stderr,
157                         "warning: kernel is too big for standalone boot "
158                         "from floppy\n");
159         while (sz > 0) {
160                 int l, n;
161 
162                 l = (sz > sizeof(buf)) ? sizeof(buf) : sz;
163                 n = read(fd, buf, l);
164                 if (n != l) {
165                         if (n < 0)
166                                 die("Error reading %s: %m", argv[3]);
167                         else
168                                 die("%s: Unexpected EOF", argv[3]);
169                 }
170                 if (write(1, buf, l) != l)
171                         die("Write failed");
172                 sz -= l;
173         }
174         close(fd);
175 
176         /* Write sizes to the bootsector */
177         if (lseek(1, 497, SEEK_SET) != 497)
178                 die("Output: seek failed");
179         buf[0] = setup_sectors;
180         if (write(1, buf, 1) != 1)
181                 die("Write of setup sector count failed");
182         if (lseek(1, 500, SEEK_SET) != 500)
183                 die("Output: seek failed");
184         buf[0] = (sys_size & 0xff);
185         buf[1] = ((sys_size >> 8) & 0xff);
186         if (write(1, buf, 2) != 2)
187                 die("Write of image length failed");
188 
189         return 0;
190 }
191 

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