230 lines
7.1 KiB
C
230 lines
7.1 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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struct boot_img_hdr_base {
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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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} __attribute__((packed));
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struct boot_img_hdr_v0 : public boot_img_hdr_base {
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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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/* In header v1, this field is used for header version
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* However, on some devices like Samsung, this field is used to store DTB
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* We will treat this field differently based on its value */
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union {
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uint32_t header_version; /* the version of the header */
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uint32_t extra_size; /* extra blob size in bytes */
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};
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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));
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struct boot_img_hdr_v1 : public boot_img_hdr_v0 {
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uint32_t recovery_dtbo_size; /* size in bytes for recovery DTBO image */
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uint64_t recovery_dtbo_offset; /* offset to recovery dtbo in boot image */
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uint32_t header_size;
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} __attribute__((packed));
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// Default to hdr v1
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typedef boot_img_hdr_v1 boot_img_hdr;
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// Special Samsung header
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struct boot_img_hdr_pxa : public boot_img_hdr_base {
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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));
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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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** | recovery dtbo | q 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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** q = (recovery_dtbo_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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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));
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struct dhtb_hdr {
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char magic[8]; /* DHTB magic */
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uint8_t 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));
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struct blob_hdr {
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char secure_magic[20]; /* "-SIGNED-BY-SIGNBLOB-" */
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uint32_t datalen; /* 0x00000000 */
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uint32_t signature; /* 0x00000000 */
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char magic[16]; /* "MSM-RADIO-UPDATE" */
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uint32_t hdr_version; /* 0x00010000 */
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uint32_t hdr_size; /* Size of header */
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uint32_t part_offset; /* Same as size */
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uint32_t num_parts; /* Number of partitions */
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uint32_t unknown[7]; /* All 0x00000000 */
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char name[4]; /* Name of partition */
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uint32_t offset; /* offset in blob where this partition starts */
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uint32_t size; /* Size of data */
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uint32_t version; /* 0x00000001 */
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} __attribute__((packed));
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// Flags
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#define MTK_KERNEL 0x0001
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#define MTK_RAMDISK 0x0002
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#define CHROMEOS_FLAG 0x0004
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#define PXA_FLAG 0x0008
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#define DHTB_FLAG 0x0010
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#define SEANDROID_FLAG 0x0020
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#define LG_BUMP_FLAG 0x0040
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#define SHA256_FLAG 0x0080
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#define BLOB_FLAG 0x0100
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#define NOOKHD_FLAG 0x0200
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#define ACCLAIM_FLAG 0x0400
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struct boot_img {
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// Memory map of the whole image
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uint8_t *map_addr;
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size_t map_size;
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// Headers
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boot_img_hdr_base *hdr; /* Android boot image header */
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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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blob_hdr *b_hdr; /* Tegra blob header */
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// Flags to indicate the state of current boot image
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uint16_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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uint8_t *dtb;
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uint32_t dt_size;
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// Pointer to end of image
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uint8_t *tail;
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size_t tail_size;
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// Pointers to blocks defined in header
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uint8_t *kernel;
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uint8_t *ramdisk;
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uint8_t *second;
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uint8_t *extra;
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uint8_t *recov_dtbo;
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~boot_img();
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int parse_image(const char *);
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void find_dtb();
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void print_hdr();
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/* Access elements in header */
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#define IS_PXA (flags & PXA_FLAG)
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#define dyn_access(x) (IS_PXA ? \
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static_cast<boot_img_hdr_pxa *>(hdr)->x : \
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static_cast<boot_img_hdr_v1 *>(hdr)->x)
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#define dyn_get(x, t) t x() const { return dyn_access(x); }
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#define dyn_set(x, t) void x(t v) { dyn_access(x) = v; }
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#define hdr_get(x, t) t x() const { return IS_PXA ? 0 : static_cast<boot_img_hdr *>(hdr)->x; }
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#define hdr_set(x, t) void x(t v) { if (!IS_PXA) static_cast<boot_img_hdr *>(hdr)->x = v; }
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dyn_set(extra_size, uint32_t);
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dyn_get(page_size, uint32_t);
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dyn_get(name, char *);
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dyn_get(cmdline, char *);
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dyn_get(id, char *);
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hdr_get(os_version, uint32_t);
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hdr_get(recovery_dtbo_size, uint32_t);
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hdr_set(recovery_dtbo_size, uint32_t);
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hdr_get(recovery_dtbo_offset, uint32_t);
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hdr_set(recovery_dtbo_offset, uint32_t);
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uint32_t header_version() {
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if (IS_PXA)
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return 0;
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uint32_t ver = static_cast<boot_img_hdr *>(hdr)->header_version;
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// There won't be v4 header any time soon...
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// If larger than 4, assume this field will be treated as extra_size
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return ver > 4 ? 0 : ver;
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}
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uint32_t extra_size() {
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// If header version > 0, we should treat this field as header_version
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return header_version() ? 0 : dyn_access(extra_size);
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}
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size_t hdr_size() {
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return IS_PXA ? sizeof(boot_img_hdr_pxa) : sizeof(boot_img_hdr);
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}
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};
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#endif
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