Magisk/native/jni/magiskboot/bootimg.h
2018-01-29 02:44:30 +08:00

163 lines
4.6 KiB
C

/* tools/mkbootimg/bootimg.h
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdint.h>
#include "types.h"
#ifndef _BOOT_IMAGE_H_
#define _BOOT_IMAGE_H_
#define BOOT_MAGIC "ANDROID!"
typedef struct boot_img_hdr {
char magic[8];
uint32_t kernel_size; /* size in bytes */
uint32_t kernel_addr; /* physical load addr */
uint32_t ramdisk_size; /* size in bytes */
uint32_t ramdisk_addr; /* physical load addr */
uint32_t second_size; /* size in bytes */
uint32_t second_addr; /* physical load addr */
uint32_t tags_addr; /* physical addr for kernel tags */
uint32_t page_size; /* flash page size we assume */
uint32_t extra_size; /* extra blob size in bytes */
/* operating system version and security patch level; for
* version "A.B.C" and patch level "Y-M-D":
* ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
* lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
* os_version = ver << 11 | lvl */
uint32_t os_version;
char name[16]; /* asciiz product name */
char cmdline[512];
uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed)) boot_img_hdr ;
typedef struct pxa_boot_img_hdr {
char magic[8];
uint32_t kernel_size; /* size in bytes */
uint32_t kernel_addr; /* physical load addr */
uint32_t ramdisk_size; /* size in bytes */
uint32_t ramdisk_addr; /* physical load addr */
uint32_t second_size; /* size in bytes */
uint32_t second_addr; /* physical load addr */
uint32_t extra_size; /* extra blob size in bytes */
uint32_t unknown; /* unknown value */
uint32_t tags_addr; /* physical addr for kernel tags */
uint32_t page_size; /* flash page size we assume */
char name[24]; /* asciiz product name */
char cmdline[512];
uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed)) pxa_boot_img_hdr;
/*
** +-----------------+
** | boot header | 1 page
** +-----------------+
** | kernel | n pages
** +-----------------+
** | ramdisk | m pages
** +-----------------+
** | second stage | o pages
** +-----------------+
** | extra blob | p pages
** +-----------------+
**
** n = (kernel_size + page_size - 1) / page_size
** m = (ramdisk_size + page_size - 1) / page_size
** o = (second_size + page_size - 1) / page_size
** p = (extra_size + page_size - 1) / page_size
**
** 0. all entities are page_size aligned in flash
** 1. kernel and ramdisk are required (size != 0)
** 2. second is optional (second_size == 0 -> no second)
** 3. load each element (kernel, ramdisk, second) at
** the specified physical address (kernel_addr, etc)
** 4. prepare tags at tag_addr. kernel_args[] is
** appended to the kernel commandline in the tags.
** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
** 6. if second_size != 0: jump to second_addr
** else: jump to kernel_addr
*/
typedef struct mtk_hdr {
uint32_t magic; /* MTK magic */
uint32_t size; /* Size of the content */
char name[32]; /* The type of the header */
} __attribute__((packed)) mtk_hdr;
// Flags
#define MTK_KERNEL 0x01
#define MTK_RAMDISK 0x02
#define CHROMEOS_FLAG 0x04
#define PXA_FLAG 0x08
typedef struct boot_img {
// Memory map of the whole image
void *map_addr;
size_t map_size;
// Headers
void *hdr; /* Either boot_img_hdr or pxa_boot_img_hdr */
mtk_hdr *k_hdr; /* MTK kernel header */
mtk_hdr *r_hdr; /* MTK ramdisk header */
// Flags to indicate the state of current boot image
uint8_t flags;
// The format of kernel and ramdisk
file_t kernel_type;
file_t ramdisk_type;
// Pointer to dtb that is appended after kernel
void *dtb;
uint32_t dt_size;
// Pointer to end of image
void *tail;
size_t tail_size;
// Pointers to blocks defined in header
void *kernel;
void *ramdisk;
void *second;
void *extra;
} boot_img;
#endif