1 files changed, 184 insertions, 0 deletions

diff --git a/arch/i386/boot/tools/build.c b/arch/i386/boot/tools/build.c
new file mode 100644
index 000000000000..26509b826aed
--- /dev/null
+++ b/arch/i386/boot/tools/build.c
@@ -0,0 +1,184 @@
+/*
+ *  $Id: build.c,v 1.5 1997/05/19 12:29:58 mj Exp $
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1997 Martin Mares
+ */
+
+/*
+ * 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
+ * Rewritten by Martin Mares, April 1997
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <asm/boot.h>
+
+typedef unsigned char byte;
+typedef unsigned short word;
+typedef unsigned long u32;
+
+#define DEFAULT_MAJOR_ROOT 0
+#define DEFAULT_MINOR_ROOT 0
+
+/* Minimal number of setup sectors (see also bootsect.S) */
+#define SETUP_SECTS 4
+
+byte buf[1024];
+int fd;
+int is_big_kernel;
+
+void die(const char * str, ...)
+{
+        va_list args;
+        va_start(args, str);
+        vfprintf(stderr, str, args);
+        fputc('\n', stderr);
+        exit(1);
+}
+
+void file_open(const char *name)
+{
+        if ((fd = open(name, O_RDONLY, 0)) < 0)
+                die("Unable to open `%s': %m", name);
+}
+
+void usage(void)
+{
+        die("Usage: build [-b] bootsect setup system [rootdev] [> image]");
+}
+
+int main(int argc, char ** argv)
+{
+        unsigned int i, c, sz, setup_sectors;
+        u32 sys_size;
+        byte major_root, minor_root;
+        struct stat sb;
+
+        if (argc > 2 && !strcmp(argv[1], "-b"))
+          {
+            is_big_kernel = 1;
+            argc--, argv++;
+          }
+        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);
+
+        file_open(argv[1]);
+        i = read(fd, buf, sizeof(buf));
+        fprintf(stderr,"Boot sector %d bytes.\n",i);
+        if (i != 512)
+                die("Boot block must be exactly 512 bytes");
+        if (buf[510] != 0x55 || buf[511] != 0xaa)
+                die("Boot block hasn't got boot flag (0xAA55)");
+        buf[508] = minor_root;
+        buf[509] = major_root;
+        if (write(1, buf, 512) != 512)
+                die("Write call failed");
+        close (fd);
+
+        file_open(argv[2]);                                 /* Copy the setup code */
+        for (i=0 ; (c=read(fd, buf, sizeof(buf)))>0 ; i+=c )
+                if (write(1, buf, c) != c)
+                        die("Write call failed");
+        if (c != 0)
+                die("read-error on `setup'");
+        close (fd);
+
+        setup_sectors = (i + 511) / 512;        /* Pad unused space with zeros */
+        /* for compatibility with ancient versions of LILO. */
+        if (setup_sectors < SETUP_SECTS)
+                setup_sectors = SETUP_SECTS;
+        fprintf(stderr, "Setup is %d bytes.\n", i);
+        memset(buf, 0, sizeof(buf));
+        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;
+        }
+
+        file_open(argv[3]);
+        if (fstat (fd, &sb))
+                die("Unable to stat `%s': %m", argv[3]);
+        sz = sb.st_size;
+        fprintf (stderr, "System is %d kB\n", sz/1024);
+        sys_size = (sz + 15) / 16;
+        if (!is_big_kernel && sys_size > DEF_SYSSIZE)
+                die("System is too big. Try using bzImage or modules.");
+        while (sz > 0) {
+                int l, n;
+
+                l = (sz > sizeof(buf)) ? sizeof(buf) : sz;
+                if ((n=read(fd, buf, l)) != l) {
+                        if (n < 0)
+                                die("Error reading %s: %m", argv[3]);
+                        else
+                                die("%s: Unexpected EOF", argv[3]);
+                }
+                if (write(1, buf, l) != l)
+                        die("Write failed");
+                sz -= l;
+        }
+        close(fd);
+
+        if (lseek(1, 497, SEEK_SET) != 497)                 /* Write sizes to the bootsector */
+                die("Output: seek failed");
+        buf[0] = setup_sectors;
+        if (write(1, buf, 1) != 1)
+                die("Write of setup sector count failed");
+        if (lseek(1, 500, SEEK_SET) != 500)
+                die("Output: seek failed");
+        buf[0] = (sys_size & 0xff);
+        buf[1] = ((sys_size >> 8) & 0xff);
+        if (write(1, buf, 2) != 2)
+                die("Write of image length failed");
+
+        return 0;                                           /* Everything is OK */
+}