LXR coreboot-v3/include/elf

   1/*
   2 * Copyright (C) 2002 Eric Biederman
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  16 *
  17 */
  18
  19#ifndef ELF_BOOT_H 
  20#define ELF_BOOT_H 
  21
  22#include <types.h>
  23
  24/* This defines the structure of a table of parameters useful for ELF
  25 * bootable images.  These parameters are all passed and generated
  26 * by the bootloader to the booted image.  For simplicity and
  27 * consistency the Elf Note format is reused.
  28 *
  29 * All of the information must be Position Independent Data.
  30 * That is it must be safe to relocate the whole ELF boot parameter
  31 * block without changing the meaning or correctnes of the data.
  32 * Additionally it must be safe to permute the order of the ELF notes
  33 * to any possible permutation without changing the meaning or correctness
  34 * of the data.
  35 *
  36 */
  37
  38#define ELF_HEAD_SIZE           (8*1024)
  39#define ELF_BOOT_MAGIC          0x0E1FB007
  40
  41typedef u16 Elf_Half;
  42typedef u32 Elf_Word;
  43typedef u64 Elf_Xword;
  44
  45typedef struct
  46{
  47        Elf_Word b_signature; /* "0x0E1FB007" */
  48        Elf_Word b_size;
  49        Elf_Half b_checksum;
  50        Elf_Half b_records;
  51} Elf_Bhdr;
  52
  53typedef struct 
  54{
  55        Elf_Word n_namesz;              /* Length of the note's name.  */
  56        Elf_Word n_descsz;              /* Length of the note's descriptor.  */
  57        Elf_Word n_type;                /* Type of the note.  */
  58} Elf_Nhdr;
  59
  60
  61/* For standard notes n_namesz must be zero */
  62/* All of the following standard note types provide a single null
  63 * terminated string in the descriptor.
  64 */
  65#define EBN_FIRMWARE_TYPE       0x00000001
  66/* On platforms that support multiple classes of firmware this field
  67 * specifies the class of firmware you are loaded under.
  68 */
  69#define EBN_BOOTLOADER_NAME     0x00000002
  70/* This specifies just the name of the bootloader for easy comparison */
  71#define EBN_BOOTLOADER_VERSION  0x00000003
  72/* This specifies the version of the bootlader */
  73#define EBN_COMMAND_LINE        0x00000004
  74/* This specifies a command line that can be set by user interaction,
  75 * and is provided as a free form string to the loaded image.
  76 */
  77
  78
  79/* Standardized Elf image notes for booting... The name for all of these is ELFBoot */
  80
  81#define ELF_NOTE_BOOT           "ELFBoot"
  82
  83#define EIN_PROGRAM_NAME        0x00000001
  84/* The program in this ELF file */
  85#define EIN_PROGRAM_VERSION     0x00000002
  86/* The version of the program in this ELF file */
  87#define EIN_PROGRAM_CHECKSUM    0x00000003
  88/* ip style checksum of the memory image. */
  89
  90
  91/* Linux image notes for booting... The name for all of these is Linux */
  92
  93#define LINUX_NOTE_BOOT         "Linux"
  94
  95#define LIN_COMMAND_LINE        0x00000001
  96/* The command line to pass to the loaded kernel. */
  97#define LIN_ROOT_DEV            0x00000002
  98/* The root dev to pass to the loaded kernel. */
  99#define LIN_RAMDISK_FLAGS       0x00000003
 100/* Various old ramdisk flags */
 101#define LIN_INITRD_START        0x00000004
 102/* Start of the ramdisk in bytes */
 103#define LIN_INITRD_SIZE         0x00000005
 104/* Size of the ramdisk in bytes */
 105
 106#endif /* ELF_BOOT_H */
 107