mirror of
https://github.com/topjohnwu/Magisk.git
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150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
#include <stdint.h>
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#include "format.h"
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#ifndef _BOOT_IMAGE_H_
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#define _BOOT_IMAGE_H_
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typedef struct boot_img_hdr {
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char magic[8];
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uint32_t kernel_size; /* size in bytes */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t second_size; /* size in bytes */
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uint32_t second_addr; /* physical load addr */
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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uint32_t extra_size; /* extra blob size in bytes */
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/* operating system version and security patch level; for
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* version "A.B.C" and patch level "Y-M-D":
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* ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
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* lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
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* os_version = ver << 11 | lvl */
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uint32_t os_version;
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char name[16]; /* asciiz product name */
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char cmdline[512];
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char id[32]; /* timestamp / checksum / sha1 / etc */
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/* Supplemental command line data; kept here to maintain
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* binary compatibility with older versions of mkbootimg */
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char extra_cmdline[1024];
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} __attribute__((packed)) boot_img_hdr ;
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typedef struct pxa_boot_img_hdr {
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char magic[8];
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uint32_t kernel_size; /* size in bytes */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t second_size; /* size in bytes */
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uint32_t second_addr; /* physical load addr */
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uint32_t extra_size; /* extra blob size in bytes */
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uint32_t unknown; /* unknown value */
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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char name[24]; /* asciiz product name */
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char cmdline[512];
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char id[32]; /* timestamp / checksum / sha1 / etc */
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/* Supplemental command line data; kept here to maintain
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* binary compatibility with older versions of mkbootimg */
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char extra_cmdline[1024];
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} __attribute__((packed)) pxa_boot_img_hdr;
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/*
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** +-----------------+
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** | boot header | 1 page
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** +-----------------+
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** | kernel | n pages
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** +-----------------+
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** | ramdisk | m pages
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** +-----------------+
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** | second stage | o pages
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** +-----------------+
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** | extra blob | p pages
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** +-----------------+
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**
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** n = (kernel_size + page_size - 1) / page_size
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** m = (ramdisk_size + page_size - 1) / page_size
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** o = (second_size + page_size - 1) / page_size
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** p = (extra_size + page_size - 1) / page_size
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**
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** 0. all entities are page_size aligned in flash
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** 1. kernel and ramdisk are required (size != 0)
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** 2. second is optional (second_size == 0 -> no second)
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** 3. load each element (kernel, ramdisk, second) at
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** the specified physical address (kernel_addr, etc)
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** 4. prepare tags at tag_addr. kernel_args[] is
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** appended to the kernel commandline in the tags.
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** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
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** 6. if second_size != 0: jump to second_addr
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** else: jump to kernel_addr
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*/
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typedef struct mtk_hdr {
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uint32_t magic; /* MTK magic */
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uint32_t size; /* Size of the content */
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char name[32]; /* The type of the header */
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} __attribute__((packed)) mtk_hdr;
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typedef struct dhtb_hdr {
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char magic[8]; /* DHTB magic */
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char checksum[40]; /* Payload SHA256, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
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uint32_t size; /* Payload size, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
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} __attribute__((packed)) dhtb_hdr;
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// Flags
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#define MTK_KERNEL 0x01
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#define MTK_RAMDISK 0x02
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#define CHROMEOS_FLAG 0x04
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#define PXA_FLAG 0x08
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#define DHTB_FLAG 0x10
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#define SEANDROID_FLAG 0x20
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#define LG_BUMP_FLAG 0x40
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#define SHA256_FLAG 0x80
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typedef struct boot_img {
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// Memory map of the whole image
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void *map_addr;
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size_t map_size;
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// Headers
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void *hdr; /* Either boot_img_hdr or pxa_boot_img_hdr */
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mtk_hdr *k_hdr; /* MTK kernel header */
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mtk_hdr *r_hdr; /* MTK ramdisk header */
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// Flags to indicate the state of current boot image
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uint8_t flags;
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// The format of kernel and ramdisk
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format_t k_fmt;
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format_t r_fmt;
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// Pointer to dtb that is appended after kernel
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void *dtb;
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uint32_t dt_size;
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// Pointer to end of image
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void *tail;
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size_t tail_size;
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// Pointers to blocks defined in header
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void *kernel;
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void *ramdisk;
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void *second;
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void *extra;
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} boot_img;
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#endif
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