arch/cris/boot/tools/build.c - kernel/prism - Git at Google

 /*
  *  linux/tools/build.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  */

 /*
  * This file builds a disk-image from three different files:
  *
  * - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
  * - setup: 8086 machine code, sets up system parm
  * - system: 80386 code for actual system
  *
  * It does some checking that all files are of the correct type, and
  * just writes the result to stdout, removing headers and padding to
  * the right amount. It also writes some system data to stderr.
  */

 /*
  * Changes by tytso to allow root device specification
  * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
  * Cross compiling fixes by Gertjan van Wingerde, July 1996
  */

 #include <stdio.h>	/* fprintf */
 #include <string.h>
 #include <stdlib.h>	/* contains exit */
 #include <sys/types.h>	/* unistd.h needs this */
 #include <sys/stat.h>
 #include <sys/sysmacros.h>
 #include <unistd.h>	/* contains read/write */
 #include <fcntl.h>
 #include <errno.h>

 #define MINIX_HEADER 32

 #define N_MAGIC_OFFSET 1024
 #ifndef __BFD__
 static int GCC_HEADER = sizeof(struct exec);
 #endif

 #ifdef __BIG_KERNEL__
 #define SYS_SIZE 0xffff
 #else
 #define SYS_SIZE DEF_SYSSIZE
 #endif

 #define DEFAULT_MAJOR_ROOT 0
 #define DEFAULT_MINOR_ROOT 0

 /* max nr of sectors of setup: don't change unless you also change
  * bootsect etc */
 #define SETUP_SECTS 4

 #define STRINGIFY(x) #x

 typedef union {
 	int i;
 	long l;
 	short s[2];
 	char b[4];
 } conv;

 long intel_long(long l)
 {
 	conv t;

 	t.b[0] = l & 0xff; l >>= 8;
 	t.b[1] = l & 0xff; l >>= 8;
 	t.b[2] = l & 0xff; l >>= 8;
 	t.b[3] = l & 0xff; l >>= 8;
 	return t.l;
 }

 int intel_int(int i)
 {
 	conv t;

 	t.b[0] = i & 0xff; i >>= 8;
         t.b[1] = i & 0xff; i >>= 8;
         t.b[2] = i & 0xff; i >>= 8;
         t.b[3] = i & 0xff; i >>= 8;
         return t.i;
 }

 short intel_short(short l)
 {
 	conv t;

 	t.b[0] = l & 0xff; l >>= 8;
 	t.b[1] = l & 0xff; l >>= 8;
 	return t.s[0];
 }

 void die(const char * str)
 {
 	fprintf(stderr,"%s\n",str);
 	exit(1);
 }

 void usage(void)
 {
 	die("Usage: build bootsect setup system [rootdev] [> image]");
 }

 int main(int argc, char ** argv)
 {
 	int i,c,id,sz,tmp_int;
 	unsigned long sys_size, tmp_long;
 	char buf[1024];
 #ifndef __BFD__
 	struct exec *ex = (struct exec *)buf;
 #endif
 	char major_root, minor_root;
 	struct stat sb;
 	unsigned char setup_sectors;

 	if ((argc < 4) || (argc > 5))
 		usage();
 	if (argc > 4) {
 		if (!strcmp(argv[4], "CURRENT")) {
 			if (stat("/", &sb)) {
 				perror("/");
 				die("Couldn't stat /");
 			}
 			major_root = major(sb.st_dev);
 			minor_root = minor(sb.st_dev);
 		} else if (strcmp(argv[4], "FLOPPY")) {
 			if (stat(argv[4], &sb)) {
 				perror(argv[4]);
 				die("Couldn't stat root device.");
 			}
 			major_root = major(sb.st_rdev);
 			minor_root = minor(sb.st_rdev);
 		} else {
 			major_root = 0;
 			minor_root = 0;
 		}
 	} else {
 		major_root = DEFAULT_MAJOR_ROOT;
 		minor_root = DEFAULT_MINOR_ROOT;
 	}
 	fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
 	for (i=0;i<sizeof buf; i++) buf[i]=0;
 	if ((id=open(argv[1],O_RDONLY,0))<0)
 		die("Unable to open 'boot'");
 	if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 		die("Unable to read header of 'boot'");
 	if (((long *) buf)[0]!=intel_long(0x04100301))
 		die("Non-Minix header of 'boot'");
 	if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 		die("Non-Minix header of 'boot'");
 	if (((long *) buf)[3] != 0)
 		die("Illegal data segment in 'boot'");
 	if (((long *) buf)[4] != 0)
 		die("Illegal bss in 'boot'");
 	if (((long *) buf)[5] != 0)
 		die("Non-Minix header of 'boot'");
 	if (((long *) buf)[7] != 0)
 		die("Illegal symbol table in 'boot'");
 	i=read(id,buf,sizeof buf);
 	fprintf(stderr,"Boot sector %d bytes.\n",i);
 	if (i != 512)
 		die("Boot block must be exactly 512 bytes");
 	if ((*(unsigned short *)(buf+510)) != (unsigned short)intel_short(0xAA55))
 		die("Boot block hasn't got boot flag (0xAA55)");
 	buf[508] = (char) minor_root;
 	buf[509] = (char) major_root;
 	i=write(1,buf,512);
 	if (i!=512)
 		die("Write call failed");
 	close (id);

 	if ((id=open(argv[2],O_RDONLY,0))<0)
 		die("Unable to open 'setup'");
 	if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 		die("Unable to read header of 'setup'");
 	if (((long *) buf)[0]!=intel_long(0x04100301))
 		die("Non-Minix header of 'setup'");
 	if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 		die("Non-Minix header of 'setup'");
 	if (((long *) buf)[3] != 0)
 		die("Illegal data segment in 'setup'");
 	if (((long *) buf)[4] != 0)
 		die("Illegal bss in 'setup'");
 	if (((long *) buf)[5] != 0)
 		die("Non-Minix header of 'setup'");
 	if (((long *) buf)[7] != 0)
 		die("Illegal symbol table in 'setup'");
 	for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
 #ifdef __BIG_KERNEL__
 	{
 		if (!i) {
 			/* Working with memcpy because of alignment constraints
 			   on Sparc - Gertjan */
 			memcpy(&tmp_long, &buf[2], sizeof(long));
 			if (tmp_long != intel_long(0x53726448) )
 				die("Wrong magic in loader header of 'setup'");
 			memcpy(&tmp_int, &buf[6], sizeof(int));
 			if (tmp_int < intel_int(0x200))
 				die("Wrong version of loader header of 'setup'");
 			buf[0x11] = 1; /* LOADED_HIGH */
 			tmp_long = intel_long(0x100000);
 			memcpy(&buf[0x14], &tmp_long, sizeof(long));  /* code32_start */
 		}
 #endif
 		if (write(1,buf,c)!=c)
 			die("Write call failed");
 #ifdef __BIG_KERNEL__
 	}
 #endif
 	if (c != 0)
 		die("read-error on 'setup'");
 	close (id);
 	setup_sectors = (unsigned char)((i + 511) / 512);
 	/* for compatibility with LILO */
 	if (setup_sectors < SETUP_SECTS)
 		setup_sectors = SETUP_SECTS;
 	fprintf(stderr,"Setup is %d bytes.\n",i);
 	for (c=0 ; c<sizeof(buf) ; c++)
 		buf[c] = '\0';
 	while (i < setup_sectors * 512) {
 		c = setup_sectors * 512 - i;
 		if (c > sizeof(buf))
 			c = sizeof(buf);
 		if (write(1,buf,c) != c)
 			die("Write call failed");
 		i += c;
 	}

 	if ((id=open(argv[3],O_RDONLY,0))<0)
 		die("Unable to open 'system'");
 #ifndef __BFD__
 	if (read(id,buf,GCC_HEADER) != GCC_HEADER)
 		die("Unable to read header of 'system'");
 	if (N_MAGIC(*ex) == ZMAGIC) {
 		GCC_HEADER = N_MAGIC_OFFSET;
 		lseek(id, GCC_HEADER, SEEK_SET);
 	} else if (N_MAGIC(*ex) != QMAGIC)
 		die("Non-GCC header of 'system'");
 	fprintf(stderr,"System is %d kB (%d kB code, %d kB data and %d kB bss)\n",
 		(ex->a_text+ex->a_data+ex->a_bss)/1024,
 		ex->a_text /1024,
 		ex->a_data /1024,
 		ex->a_bss  /1024);
 	sz = N_SYMOFF(*ex) - GCC_HEADER + 4;
 #else
 	if (fstat (id, &sb)) {
 	  perror ("fstat");
 	  die ("Unable to stat 'system'");
 	}
 	sz = sb.st_size;
 	fprintf (stderr, "System is %d kB\n", sz/1024);
 #endif
 	sys_size = (sz + 15) / 16;
 	if (sys_size > SYS_SIZE)
 		die("System is too big");
 	while (sz > 0) {
 		int l, n;

 		l = sz;
 		if (l > sizeof(buf))
 			l = sizeof(buf);
 		if ((n=read(id, buf, l)) != l) {
 			if (n == -1)
 				perror(argv[1]);
 			else
 				fprintf(stderr, "Unexpected EOF\n");
 			die("Can't read 'system'");
 		}
 		if (write(1, buf, l) != l)
 			die("Write failed");
 		sz -= l;
 	}
 	close(id);
 	if (lseek(1, 497, 0) == 497) {
 		if (write(1, &setup_sectors, 1) != 1)
 			die("Write of setup sectors failed");
 	}
 	if (lseek(1,500,0) == 500) {
 		buf[0] = (sys_size & 0xff);
 		buf[1] = ((sys_size >> 8) & 0xff);
 		if (write(1, buf, 2) != 2)
 			die("Write failed");
 	}
 	return(0);
 }
	/*
	* linux/tools/build.c
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	*/

	/*
	* This file builds a disk-image from three different files:
	*
	* - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
	* - setup: 8086 machine code, sets up system parm
	* - system: 80386 code for actual system
	*
	* It does some checking that all files are of the correct type, and
	* just writes the result to stdout, removing headers and padding to
	* the right amount. It also writes some system data to stderr.
	*/

	/*
	* Changes by tytso to allow root device specification
	* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
	* Cross compiling fixes by Gertjan van Wingerde, July 1996
	*/

	#include <stdio.h> /* fprintf */
	#include <string.h>
	#include <stdlib.h> /* contains exit */
	#include <sys/types.h> /* unistd.h needs this */
	#include <sys/stat.h>
	#include <sys/sysmacros.h>
	#include <unistd.h> /* contains read/write */
	#include <fcntl.h>
	#include <errno.h>

	#define MINIX_HEADER 32

	#define N_MAGIC_OFFSET 1024
	#ifndef __BFD__
	static int GCC_HEADER = sizeof(struct exec);
	#endif

	#ifdef __BIG_KERNEL__
	#define SYS_SIZE 0xffff
	#else
	#define SYS_SIZE DEF_SYSSIZE
	#endif

	#define DEFAULT_MAJOR_ROOT 0
	#define DEFAULT_MINOR_ROOT 0

	/* max nr of sectors of setup: don't change unless you also change
	* bootsect etc */
	#define SETUP_SECTS 4

	#define STRINGIFY(x) #x

	typedef union {
	int i;
	long l;
	short s[2];
	char b[4];
	} conv;

	long intel_long(long l)
	{
	conv t;

	t.b[0] = l & 0xff; l >>= 8;
	t.b[1] = l & 0xff; l >>= 8;
	t.b[2] = l & 0xff; l >>= 8;
	t.b[3] = l & 0xff; l >>= 8;
	return t.l;
	}

	int intel_int(int i)
	{
	conv t;

	t.b[0] = i & 0xff; i >>= 8;
	t.b[1] = i & 0xff; i >>= 8;
	t.b[2] = i & 0xff; i >>= 8;
	t.b[3] = i & 0xff; i >>= 8;
	return t.i;
	}

	short intel_short(short l)
	{
	conv t;

	t.b[0] = l & 0xff; l >>= 8;
	t.b[1] = l & 0xff; l >>= 8;
	return t.s[0];
	}

	void die(const char * str)
	{
	fprintf(stderr,"%s\n",str);
	exit(1);
	}

	void usage(void)
	{
	die("Usage: build bootsect setup system [rootdev] [> image]");
	}

	int main(int argc, char ** argv)
	{
	int i,c,id,sz,tmp_int;
	unsigned long sys_size, tmp_long;
	char buf[1024];
	#ifndef __BFD__
	struct exec ex = (struct exec )buf;
	#endif
	char major_root, minor_root;
	struct stat sb;
	unsigned char setup_sectors;

	if ((argc < 4) \|\| (argc > 5))
	usage();
	if (argc > 4) {
	if (!strcmp(argv[4], "CURRENT")) {
	if (stat("/", &sb)) {
	perror("/");
	die("Couldn't stat /");
	}
	major_root = major(sb.st_dev);
	minor_root = minor(sb.st_dev);
	} else if (strcmp(argv[4], "FLOPPY")) {
	if (stat(argv[4], &sb)) {
	perror(argv[4]);
	die("Couldn't stat root device.");
	}
	major_root = major(sb.st_rdev);
	minor_root = minor(sb.st_rdev);
	} else {
	major_root = 0;
	minor_root = 0;
	}
	} else {
	major_root = DEFAULT_MAJOR_ROOT;
	minor_root = DEFAULT_MINOR_ROOT;
	}
	fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
	for (i=0;i<sizeof buf; i++) buf[i]=0;
	if ((id=open(argv[1],O_RDONLY,0))<0)
	die("Unable to open 'boot'");
	if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
	die("Unable to read header of 'boot'");
	if (((long *) buf)[0]!=intel_long(0x04100301))
	die("Non-Minix header of 'boot'");
	if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
	die("Non-Minix header of 'boot'");
	if (((long *) buf)[3] != 0)
	die("Illegal data segment in 'boot'");
	if (((long *) buf)[4] != 0)
	die("Illegal bss in 'boot'");
	if (((long *) buf)[5] != 0)
	die("Non-Minix header of 'boot'");
	if (((long *) buf)[7] != 0)
	die("Illegal symbol table in 'boot'");
	i=read(id,buf,sizeof buf);
	fprintf(stderr,"Boot sector %d bytes.\n",i);
	if (i != 512)
	die("Boot block must be exactly 512 bytes");
	if (((unsigned short )(buf+510)) != (unsigned short)intel_short(0xAA55))
	die("Boot block hasn't got boot flag (0xAA55)");
	buf[508] = (char) minor_root;
	buf[509] = (char) major_root;
	i=write(1,buf,512);
	if (i!=512)
	die("Write call failed");
	close (id);

	if ((id=open(argv[2],O_RDONLY,0))<0)
	die("Unable to open 'setup'");
	if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
	die("Unable to read header of 'setup'");
	if (((long *) buf)[0]!=intel_long(0x04100301))
	die("Non-Minix header of 'setup'");
	if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
	die("Non-Minix header of 'setup'");
	if (((long *) buf)[3] != 0)
	die("Illegal data segment in 'setup'");
	if (((long *) buf)[4] != 0)
	die("Illegal bss in 'setup'");
	if (((long *) buf)[5] != 0)
	die("Non-Minix header of 'setup'");
	if (((long *) buf)[7] != 0)
	die("Illegal symbol table in 'setup'");
	for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
	#ifdef __BIG_KERNEL__
	{
	if (!i) {
	/* Working with memcpy because of alignment constraints
	on Sparc - Gertjan */
	memcpy(&tmp_long, &buf[2], sizeof(long));
	if (tmp_long != intel_long(0x53726448) )
	die("Wrong magic in loader header of 'setup'");
	memcpy(&tmp_int, &buf[6], sizeof(int));
	if (tmp_int < intel_int(0x200))
	die("Wrong version of loader header of 'setup'");
	buf[0x11] = 1; /* LOADED_HIGH */
	tmp_long = intel_long(0x100000);
	memcpy(&buf[0x14], &tmp_long, sizeof(long)); /* code32_start */
	}
	#endif
	if (write(1,buf,c)!=c)
	die("Write call failed");
	#ifdef __BIG_KERNEL__
	}
	#endif
	if (c != 0)
	die("read-error on 'setup'");
	close (id);
	setup_sectors = (unsigned char)((i + 511) / 512);
	/* for compatibility with LILO */
	if (setup_sectors < SETUP_SECTS)
	setup_sectors = SETUP_SECTS;
	fprintf(stderr,"Setup is %d bytes.\n",i);
	for (c=0 ; c<sizeof(buf) ; c++)
	buf[c] = '\0';
	while (i < setup_sectors * 512) {
	c = setup_sectors * 512 - i;
	if (c > sizeof(buf))
	c = sizeof(buf);
	if (write(1,buf,c) != c)
	die("Write call failed");
	i += c;
	}

	if ((id=open(argv[3],O_RDONLY,0))<0)
	die("Unable to open 'system'");
	#ifndef __BFD__
	if (read(id,buf,GCC_HEADER) != GCC_HEADER)
	die("Unable to read header of 'system'");
	if (N_MAGIC(*ex) == ZMAGIC) {
	GCC_HEADER = N_MAGIC_OFFSET;
	lseek(id, GCC_HEADER, SEEK_SET);
	} else if (N_MAGIC(*ex) != QMAGIC)
	die("Non-GCC header of 'system'");
	fprintf(stderr,"System is %d kB (%d kB code, %d kB data and %d kB bss)\n",
	(ex->a_text+ex->a_data+ex->a_bss)/1024,
	ex->a_text /1024,
	ex->a_data /1024,
	ex->a_bss /1024);
	sz = N_SYMOFF(*ex) - GCC_HEADER + 4;
	#else
	if (fstat (id, &sb)) {
	perror ("fstat");
	die ("Unable to stat 'system'");
	}
	sz = sb.st_size;
	fprintf (stderr, "System is %d kB\n", sz/1024);
	#endif
	sys_size = (sz + 15) / 16;
	if (sys_size > SYS_SIZE)
	die("System is too big");
	while (sz > 0) {
	int l, n;

	l = sz;
	if (l > sizeof(buf))
	l = sizeof(buf);
	if ((n=read(id, buf, l)) != l) {
	if (n == -1)
	perror(argv[1]);
	else
	fprintf(stderr, "Unexpected EOF\n");
	die("Can't read 'system'");
	}
	if (write(1, buf, l) != l)
	die("Write failed");
	sz -= l;
	}
	close(id);
	if (lseek(1, 497, 0) == 497) {
	if (write(1, &setup_sectors, 1) != 1)
	die("Write of setup sectors failed");
	}
	if (lseek(1,500,0) == 500) {
	buf[0] = (sys_size & 0xff);
	buf[1] = ((sys_size >> 8) & 0xff);
	if (write(1, buf, 2) != 2)
	die("Write failed");
	}
	return(0);
	}