i386: move boot

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 169 insertions, 0 deletions

diff --git a/arch/x86/boot/tools/.gitignore b/arch/x86/boot/tools/.gitignore
new file mode 100644
index 000000000000..378eac25d311
--- /dev/null
+++ b/arch/x86/boot/tools/.gitignore
@@ -0,0 +1 @@
+build
diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c
new file mode 100644
index 000000000000..b4248740ff0d
--- /dev/null
+++ b/arch/x86/boot/tools/build.c
@@ -0,0 +1,168 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1997 Martin Mares
+ *  Copyright (C) 2007 H. Peter Anvin
+ */
+
+/*
+ * This file builds a disk-image from two different files:
+ *
+ * - 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
+ * Substantially overhauled by H. Peter Anvin, April 2007
+ */
+
+#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 <sys/mman.h>
+#include <asm/boot.h>
+
+typedef unsigned char  u8;
+typedef unsigned short u16;
+typedef unsigned long  u32;
+
+#define DEFAULT_MAJOR_ROOT 0
+#define DEFAULT_MINOR_ROOT 0
+
+/* Minimal number of setup sectors */
+#define SETUP_SECT_MIN 5
+#define SETUP_SECT_MAX 64
+
+/* This must be large enough to hold the entire setup */
+u8 buf[SETUP_SECT_MAX*512];
+int is_big_kernel;
+
+static void die(const char * str, ...)
+{
+        va_list args;
+        va_start(args, str);
+        vfprintf(stderr, str, args);
+        fputc('\n', stderr);
+        exit(1);
+}
+
+static void usage(void)
+{
+        die("Usage: build [-b] setup system [rootdev] [> image]");
+}
+
+int main(int argc, char ** argv)
+{
+        unsigned int i, sz, setup_sectors;
+        int c;
+        u32 sys_size;
+        u8 major_root, minor_root;
+        struct stat sb;
+        FILE *file;
+        int fd;
+        void *kernel;
+
+        if (argc > 2 && !strcmp(argv[1], "-b"))
+          {
+            is_big_kernel = 1;
+            argc--, argv++;
+          }
+        if ((argc < 3) || (argc > 4))
+                usage();
+        if (argc > 3) {
+                if (!strcmp(argv[3], "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[3], "FLOPPY")) {
+                        if (stat(argv[3], &sb)) {
+                                perror(argv[3]);
+                                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);
+
+        /* Copy the setup code */
+        file = fopen(argv[1], "r");
+        if (!file)
+                die("Unable to open `%s': %m", argv[1]);
+        c = fread(buf, 1, sizeof(buf), file);
+        if (ferror(file))
+                die("read-error on `setup'");
+        if (c < 1024)
+                die("The setup must be at least 1024 bytes");
+        if (buf[510] != 0x55 || buf[511] != 0xaa)
+                die("Boot block hasn't got boot flag (0xAA55)");
+        fclose(file);
+
+        /* Pad unused space with zeros */
+        setup_sectors = (c + 511) / 512;
+        if (setup_sectors < SETUP_SECT_MIN)
+                setup_sectors = SETUP_SECT_MIN;
+        i = setup_sectors*512;
+        memset(buf+c, 0, i-c);
+
+        /* Set the default root device */
+        buf[508] = minor_root;
+        buf[509] = major_root;
+
+        fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i);
+
+        /* Open and stat the kernel file */
+        fd = open(argv[2], O_RDONLY);
+        if (fd < 0)
+                die("Unable to open `%s': %m", argv[2]);
+        if (fstat(fd, &sb))
+                die("Unable to stat `%s': %m", argv[2]);
+        sz = sb.st_size;
+        fprintf (stderr, "System is %d kB\n", (sz+1023)/1024);
+        kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
+        if (kernel == MAP_FAILED)
+                die("Unable to mmap '%s': %m", argv[2]);
+        sys_size = (sz + 15) / 16;
+        if (!is_big_kernel && sys_size > DEF_SYSSIZE)
+                die("System is too big. Try using bzImage or modules.");
+
+        /* Patch the setup code with the appropriate size parameters */
+        buf[0x1f1] = setup_sectors-1;
+        buf[0x1f4] = sys_size;
+        buf[0x1f5] = sys_size >> 8;
+        buf[0x1f6] = sys_size >> 16;
+        buf[0x1f7] = sys_size >> 24;
+
+        if (fwrite(buf, 1, i, stdout) != i)
+                die("Writing setup failed");
+
+        /* Copy the kernel code */
+        if (fwrite(kernel, 1, sz, stdout) != sz)
+                die("Writing kernel failed");
+        close(fd);
+
+        /* Everything is OK */
+        return 0;
+}