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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2003-2005 Eric Biederman (ebiederm@xmission.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <elf.h>
#include <boot/elf_boot.h>
#include <ip_checksum.h>
#include <x86/x86-linux.h>
#include "kexec.h"
#include "kexec-elf.h"
#include "kexec-elf-boot.h"
#define UPSZ(X) ((sizeof(X) + 3) &~3)
static struct boot_notes {
Elf_Bhdr hdr;
Elf_Nhdr bl_hdr;
unsigned char bl_desc[UPSZ(BOOTLOADER)];
Elf_Nhdr blv_hdr;
unsigned char blv_desc[UPSZ(BOOTLOADER_VERSION)];
Elf_Nhdr cmd_hdr;
unsigned char command_line[0];
} boot_notes = {
.hdr = {
.b_signature = ELF_BOOT_MAGIC,
.b_size = sizeof(boot_notes),
.b_checksum = 0,
.b_records = 3,
},
.bl_hdr = {
.n_namesz = 0,
.n_descsz = sizeof(BOOTLOADER),
.n_type = EBN_BOOTLOADER_NAME,
},
.bl_desc = BOOTLOADER,
.blv_hdr = {
.n_namesz = 0,
.n_descsz = sizeof(BOOTLOADER_VERSION),
.n_type = EBN_BOOTLOADER_VERSION,
},
.blv_desc = BOOTLOADER_VERSION,
.cmd_hdr = {
.n_namesz = 0,
.n_descsz = 0,
.n_type = EBN_COMMAND_LINE,
},
};
static inline unsigned long align(unsigned long val, unsigned long align)
{
return (val + align - 1) & ~(align - 1);
}
unsigned long elf_boot_notes(
struct kexec_info *info, unsigned long max_addr,
const char *cmdline, int cmdline_len)
{
unsigned long note_bytes;
unsigned long note_base;
struct boot_notes *notes;
note_bytes = sizeof(*notes) + align(cmdline_len, 4);
notes = xmalloc(note_bytes);
memcpy(notes, &boot_notes, sizeof(boot_notes));
memcpy(notes->command_line, cmdline, cmdline_len);
notes->hdr.b_size = note_bytes;
notes->cmd_hdr.n_descsz = cmdline_len;
notes->hdr.b_checksum = compute_ip_checksum(notes, note_bytes);
note_base = add_buffer(info, notes, note_bytes, note_bytes,
4, 0, max_addr, 1);
return note_base;
}
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