include/asm-i386/zimage.h

   1 /*
   2  * (C) Copyright 2002
   3  * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #ifndef _ASM_ZIMAGE_H_
  25 #define _ASM_ZIMAGE_H_
  26
  27 /* linux i386 zImage/bzImage header. Offsets relative to
  28  * the start of the image */
  29
  30 #define CMD_LINE_MAGIC_OFF  0x020 /* Magic 0xa33f if the offset below is valid */
  31 #define CMD_LINE_OFFSET_OFF 0x022 /* Offset to comandline */
  32 #define SETUP_SECTS_OFF     0x1F1 /* The size of the setup in sectors */
  33 #define ROOT_FLAGS_OFF      0x1F2 /* If set, the root is mounted readonly */
  34 #define VID_MODE_OFF        0x1FA /* Video mode control */
  35 #define ROOT_DEV_OFF        0x1FC /* Default root device number */
  36 #define BOOT_FLAG_OFF       0x1FE /* 0xAA55 magic number */
  37 #define HEADER_OFF          0x202 /* Magic signature "HdrS" */
  38 #define VERSION_OFF         0x206 /* Boot protocol version supported */
  39 #define REALMODE_SWTCH_OFF  0x208 /* Boot loader hook (see below) */
  40 #define START_SYS_OFF       0x20C /* Points to kernel version string */
  41 #define TYPE_OF_LOADER_OFF  0x210 /* Boot loader identifier */
  42 #define LOADFLAGS_OFF       0x211 /* Boot protocol option flags */
  43 #define SETUP_MOVE_SIZE_OFF 0x212 /* Move to high memory size (used with hooks) */
  44 #define CODE32_START_OFF    0x214 /* Boot loader hook (see below) */
  45 #define RAMDISK_IMAGE_OFF   0x218 /* initrd load address (set by boot loader) */
  46 #define RAMDISK_SIZE_OFF    0x21C /* initrd size (set by boot loader) */
  47 #define HEAP_END_PTR_OFF    0x224 /* Free memory after setup end */
  48 #define CMD_LINE_PTR_OFF    0x228 /* 32-bit pointer to the kernel command line */
  49
  50
  51 #define HEAP_FLAG           0x80
  52 #define BIG_KERNEL_FLAG     0x01
  53
  54 /* magic numbers */
  55 #define KERNEL_MAGIC        0xaa55
  56 #define KERNEL_V2_MAGIC     0x53726448
  57 #define COMMAND_LINE_MAGIC  0xA33F
  58
  59 /* limits */
  60 #define BZIMAGE_MAX_SIZE   15*1024*1024     /* 15MB */
  61 #define ZIMAGE_MAX_SIZE    512*1024         /* 512k */
  62 #define SETUP_MAX_SIZE     32768
  63
  64 #define SETUP_START_OFFSET 0x200
  65 #define BZIMAGE_LOAD_ADDR  0x100000
  66 #define ZIMAGE_LOAD_ADDR   0x10000
  67
  68 void *load_zimage(char *image, unsigned long kernel_size,
  69                   unsigned long initrd_addr, unsigned long initrd_size,
  70                   int auto_boot);
  71
  72 void boot_zimage(void *setup_base);
  73
  74 #endif