mtk-lk/platform/common/include/bootimg.h

/*
 * Copyright (C) 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.
 */

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein
 * is confidential and proprietary to MediaTek Inc. and/or its licensors.
 * Without the prior written permission of MediaTek inc. and/or its licensors,
 * any reproduction, modification, use or disclosure of MediaTek Software,
 * and information contained herein, in whole or in part, shall be strictly prohibited.
 */

/* MediaTek Inc. (C) 2017. All rights reserved.
 *
 * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
 * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER ON
 * AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
 * NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
 * SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
 * SUPPLIED WITH THE MEDIATEK SOFTWARE, AND RECEIVER AGREES TO LOOK ONLY TO SUCH
 * THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. RECEIVER EXPRESSLY ACKNOWLEDGES
 * THAT IT IS RECEIVER'S SOLE RESPONSIBILITY TO OBTAIN FROM ANY THIRD PARTY ALL PROPER LICENSES
 * CONTAINED IN MEDIATEK SOFTWARE. MEDIATEK SHALL ALSO NOT BE RESPONSIBLE FOR ANY MEDIATEK
 * SOFTWARE RELEASES MADE TO RECEIVER'S SPECIFICATION OR TO CONFORM TO A PARTICULAR
 * STANDARD OR OPEN FORUM. RECEIVER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND
 * CUMULATIVE LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
 * AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
 * OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY RECEIVER TO
 * MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
 *
 * The following software/firmware and/or related documentation ("MediaTek Software")
 * have been modified by MediaTek Inc. All revisions are subject to any receiver\'s
 * applicable license agreements with MediaTek Inc.
 */

#ifndef __BOOTIMG_H__
#define __BOOTIMG_H__

#include <pal_typedefs.h>

#define BOOTIMG_MAGIC    "ANDROID!"
#define BOOTIMG_MAGIC_SZ (8)
#define BOOTIMG_NAME_SZ  (16)
#define BOOTIMG_ARGS_SZ  (512)
#define BOOT_EXTRA_ARGS_SIZE (1024)

#define VENDOR_BOOT_MAGIC "VNDRBOOT"
#define VENDOR_BOOT_MAGIC_SIZE 8
#define VENDOR_BOOT_ARGS_SIZE 2048
#define VENDOR_BOOT_NAME_SIZE 16

#define BOOT_HEADER_VERSION_ZERO  0
#define BOOT_HEADER_VERSION_ONE   1
#define BOOT_HEADER_VERSION_TWO   2
#define BOOT_HEADER_VERSION_THREE 3

#define BOOT_IMAGE_HEADER_V1_SIZE      1648
#define BOOT_IMAGE_HEADER_V2_SIZE      1660
#define BOOT_IMAGE_HEADER_V3_SIZE      1596
#define VENDOR_BOOT_IMAGE_HEADER_V3_SIZE   2108

#define BOOT_IMAGE_HEADER_V3_PAGESIZE  4096

#define BOOTIMG_HDR_SZ   (0x800)

/* When the boot image header has a version of 2, the structure of the boot
 * image is as follows:
 *
 * +---------------------+
 * | boot header         | 1 page
 * +---------------------+
 * | kernel              | n pages
 * +---------------------+
 * | ramdisk             | m pages
 * +---------------------+
 * | second stage        | o pages
 * +---------------------+
 * | recovery dtbo/acpio | p pages
 * +---------------------+
 * | dtb                 | q 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 = (recovery_dtbo_size + page_size - 1) / page_size
 * q = (dtb_size + page_size - 1) / page_size
 *
 * 0. all entities are page_size aligned in flash
 * 1. kernel, ramdisk and DTB are required (size != 0)
 * 2. recovery_dtbo/recovery_acpio is required for recovery.img in non-A/B
 *    devices(recovery_dtbo_size != 0)
 * 3. second is optional (second_size == 0 -> no second)
 * 4. load each element (kernel, ramdisk, second, dtb) at
 *    the specified physical address (kernel_addr, etc)
 * 5. If booting to recovery mode in a non-A/B device, extract recovery
 *    dtbo/acpio and apply the correct set of overlays on the base device tree
 *    depending on the hardware/product revision.
 * 6. prepare tags at tag_addr.  kernel_args[] is
 *    appended to the kernel commandline in the tags.
 * 7. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
 * 8. if second_size != 0: jump to second_addr
 *    else: jump to kernel_addr
 */

struct bootimg_hdr {
	uint8_t  magic[BOOTIMG_MAGIC_SZ];
	uint32_t kernel_sz;  /* size in bytes */
	uint32_t kernel_addr;  /* physical load addr */
	uint32_t ramdisk_sz; /* size in bytes */
	uint32_t ramdisk_addr; /* physical load addr */
	uint32_t second_sz;  /* size in bytes */
	uint32_t second_addr;  /* physical load addr */
	uint32_t tags_addr;    /* physical addr for kernel tags */
	uint32_t page_sz;    /* flash page size we assume */
	uint32_t header_version;
	uint32_t os_version;
	uint8_t  name[BOOTIMG_NAME_SZ]; /* asciiz product name */
	uint8_t  cmdline[BOOTIMG_ARGS_SZ];
	uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
	uint8_t  extra_cmdline[BOOT_EXTRA_ARGS_SIZE];
	uint32_t recovery_dtbo_size; /* size of recovery dtbo image */
	uint64_t recovery_dtbo_offset; /* physical load addr */
	uint32_t header_size; /* size of boot image header in bytes */
	uint32_t dtb_size; /* size in bytes for DTB image */
	uint64_t dtb_addr; /* physical load address for DTB image */
} __attribute__((packed));

/* When the boot image header has a version of 3, the structure of the boot
 * image is as follows:
 *
 * +---------------------+
 * | boot header         | 4096 bytes
 * +---------------------+
 * | kernel              | m
 * +---------------------+
 * | ramdisk             | n
 * +---------------------+
 *
 * m = (kernel_size + 4096 - 1) / 4096
 * n = (ramdisk_size + 4096 - 1) / 4096
 *
 * Note that in version 3 of the boot image header, page size is fixed at 4096 bytes.
 *
 * The structure of the vendor boot image (introduced with version 3 and
 * required to be present when a v3 boot image is used) is as follows:
 *
 * +---------------------+
 * | vendor boot header  | 1 page
 * +---------------------+
 * | vendor ramdisk      | o pages
 * +---------------------+
 * | dtb                 | p pages
 * +---------------------+

 * o = (vendor_ramdisk_size + page_size - 1) / page_size
 * p = (dtb_size + page_size - 1) / page_size
 *
 * 0. all entities in the boot image are 4096-byte aligned in flash, all
 *    entities in the vendor boot image are page_size (determined by the vendor
 *    and specified in the vendor boot image header) aligned in flash
 * 1. kernel, ramdisk, vendor ramdisk, and DTB are required (size != 0)
 * 2. load the kernel and DTB at the specified physical address (kernel_addr,
 *    dtb_addr)
 * 3. load the vendor ramdisk at ramdisk_addr
 * 4. load the generic ramdisk immediately following the vendor ramdisk in
 *    memory
 * 5. prepare tags at tag_addr.  kernel_args[] is appended to the kernel
 *    commandline in the tags.
 * 6. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
 * 7. if the platform has a second stage bootloader jump to it (must be
 *    contained outside boot and vendor boot partitions), otherwise
 *    jump to kernel_addr
 */
struct boot_img_hdr_v3 {
    // Must be BOOT_MAGIC.
    uint8_t magic[BOOTIMG_MAGIC_SZ];

    uint32_t kernel_size; /* size in bytes */
    uint32_t ramdisk_size; /* size in bytes */

    // Operating system version and security patch level.
    // For version "A.B.C" and patch level "Y-M-D":
    //   (7 bits for each of A, B, C; 7 bits for (Y-2000), 4 bits for M)
    //   os_version = A[31:25] B[24:18] C[17:11] (Y-2000)[10:4] M[3:0]
    uint32_t os_version;

    uint32_t header_size;

    uint32_t reserved[4];

    // Version of the boot image header.
    uint32_t header_version;

    uint8_t cmdline[BOOTIMG_ARGS_SZ + BOOT_EXTRA_ARGS_SIZE];
} __attribute__((packed));

struct vendor_boot_img_hdr_v3 {
    // Must be VENDOR_BOOT_MAGIC.
    uint8_t magic[VENDOR_BOOT_MAGIC_SIZE];

    // Version of the vendor boot image header.
    uint32_t header_version;

    uint32_t page_size; /* flash page size we assume */

    uint32_t kernel_addr; /* physical load addr */
    uint32_t ramdisk_addr; /* physical load addr */

    uint32_t vendor_ramdisk_size; /* size in bytes */

    uint8_t cmdline[VENDOR_BOOT_ARGS_SIZE];

    uint32_t tags_addr; /* physical addr for kernel tags */
    uint8_t name[VENDOR_BOOT_NAME_SIZE]; /* asciiz product name */

    uint32_t header_size;

    uint32_t dtb_size; /* size in bytes for DTB image */
    uint64_t dtb_addr; /* physical load address for DTB image */
} __attribute__((packed));

#endif /* __BOOTIMG_H__ */