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https://github.com/topjohnwu/Magisk.git
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boot image header v4
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parent
0580932610
commit
439d497a13
@ -247,7 +247,15 @@ void boot_img::parse_image(uint8_t *addr, format_t type) {
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auto hp = reinterpret_cast<boot_img_hdr*>(addr);
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if (type == AOSP_VENDOR) {
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fprintf(stderr, "VENDOR_BOOT_HDR\n");
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hdr = new dyn_img_vnd_v3(addr);
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switch (hp->header_version) {
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case 4:
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hdr = new dyn_img_vnd_v4(addr);
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break;
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case 3:
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default:
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hdr = new dyn_img_vnd_v3(addr);
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break;
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}
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} else if (hp->page_size >= 0x02000000) {
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fprintf(stderr, "PXA_BOOT_HDR\n");
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hdr = new dyn_img_pxa(addr);
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@ -276,6 +284,9 @@ void boot_img::parse_image(uint8_t *addr, format_t type) {
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case 3:
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hdr = new dyn_img_v3(addr);
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break;
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case 4:
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hdr = new dyn_img_v4(addr);
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break;
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default:
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hdr = new dyn_img_v0(addr);
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break;
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@ -104,6 +104,8 @@ struct AvbVBMetaImageHeader {
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#define BOOT_ARGS_SIZE 512
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#define BOOT_EXTRA_ARGS_SIZE 1024
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#define VENDOR_BOOT_ARGS_SIZE 2048
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#define VENDOR_RAMDISK_NAME_SIZE 32
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#define VENDOR_RAMDISK_TABLE_ENTRY_BOARD_ID_SIZE 16
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/*
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* +-----------------+
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@ -261,6 +263,101 @@ struct boot_img_hdr_vnd_v3 {
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uint64_t dtb_addr; /* physical load address for DTB image */
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} __attribute__((packed));
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/* When the boot image header has a version of 4, the structure of the boot
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* image is as follows:
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*
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* +---------------------+
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* | boot header | 4096 bytes
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* +---------------------+
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* | kernel | m pages
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* +---------------------+
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* | ramdisk | n pages
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* +---------------------+
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* | boot signature | g pages
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* +---------------------+
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*
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* m = (kernel_size + 4096 - 1) / 4096
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* n = (ramdisk_size + 4096 - 1) / 4096
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* g = (signature_size + 4096 - 1) / 4096
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*
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* Note that in version 4 of the boot image header, page size is fixed at 4096
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* bytes.
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*
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* The structure of the vendor boot image version 4, which is required to be
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* present when a version 4 boot image is used, is as follows:
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*
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* +------------------------+
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* | vendor boot header | o pages
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* +------------------------+
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* | vendor ramdisk section | p pages
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* +------------------------+
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* | dtb | q pages
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* +------------------------+
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* | vendor ramdisk table | r pages
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* +------------------------+
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* | bootconfig | s pages
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* +------------------------+
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*
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* o = (2128 + page_size - 1) / page_size
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* p = (vendor_ramdisk_size + page_size - 1) / page_size
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* q = (dtb_size + page_size - 1) / page_size
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* r = (vendor_ramdisk_table_size + page_size - 1) / page_size
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* s = (vendor_bootconfig_size + page_size - 1) / page_size
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*
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* Note that in version 4 of the vendor boot image, multiple vendor ramdisks can
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* be included in the vendor boot image. The bootloader can select a subset of
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* ramdisks to load at runtime. To help the bootloader select the ramdisks, each
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* ramdisk is tagged with a type tag and a set of hardware identifiers
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* describing the board, soc or platform that this ramdisk is intended for.
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*
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* The vendor ramdisk section is consist of multiple ramdisk images concatenated
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* one after another, and vendor_ramdisk_size is the size of the section, which
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* is the total size of all the ramdisks included in the vendor boot image.
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*
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* The vendor ramdisk table holds the size, offset, type, name and hardware
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* identifiers of each ramdisk. The type field denotes the type of its content.
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* The vendor ramdisk names are unique. The hardware identifiers are specified
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* in the board_id field in each table entry. The board_id field is consist of a
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* vector of unsigned integer words, and the encoding scheme is defined by the
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* hardware vendor.
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*
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* For the different type of ramdisks, there are:
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* - VENDOR_RAMDISK_TYPE_NONE indicates the value is unspecified.
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* - VENDOR_RAMDISK_TYPE_PLATFORM ramdisks contain platform specific bits, so
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* the bootloader should always load these into memory.
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* - VENDOR_RAMDISK_TYPE_RECOVERY ramdisks contain recovery resources, so
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* the bootloader should load these when booting into recovery.
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* - VENDOR_RAMDISK_TYPE_DLKM ramdisks contain dynamic loadable kernel
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* modules.
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*
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* Version 4 of the vendor boot image also adds a bootconfig section to the end
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* of the image. This section contains Boot Configuration parameters known at
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* build time. The bootloader is responsible for placing this section directly
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* after the generic ramdisk, followed by the bootconfig trailer, before
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* entering the kernel.
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*/
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struct boot_img_hdr_v4 : public boot_img_hdr_v3 {
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uint32_t signature_size; /* size in bytes */
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} __attribute__((packed));
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struct boot_img_hdr_vnd_v4 : public boot_img_hdr_vnd_v3 {
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uint32_t vendor_ramdisk_table_size; /* size in bytes for the vendor ramdisk table */
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uint32_t vendor_ramdisk_table_entry_num; /* number of entries in the vendor ramdisk table */
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uint32_t vendor_ramdisk_table_entry_size; /* size in bytes for a vendor ramdisk table entry */
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uint32_t bootconfig_size; /* size in bytes for the bootconfig section */
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} __attribute__((packed));
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struct vendor_ramdisk_table_entry_v4 {
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uint32_t ramdisk_size; /* size in bytes for the ramdisk image */
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uint32_t ramdisk_offset; /* offset to the ramdisk image in vendor ramdisk section */
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uint32_t ramdisk_type; /* type of the ramdisk */
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uint8_t ramdisk_name[VENDOR_RAMDISK_NAME_SIZE]; /* asciiz ramdisk name */
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// Hardware identifiers describing the board, soc or platform which this
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// ramdisk is intended to be loaded on.
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uint32_t board_id[VENDOR_RAMDISK_TABLE_ENTRY_BOARD_ID_SIZE];
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} __attribute__((packed));
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/*******************************
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* Polymorphic Universal Header
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*******************************/
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@ -310,8 +407,10 @@ protected:
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// Main header could be either AOSP or PXA
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boot_img_hdr_v2 *v2_hdr; /* AOSP v2 header */
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boot_img_hdr_v3 *v3_hdr; /* AOSP v3 header */
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boot_img_hdr_v4 *v4_hdr; /* AOSP v4 header */
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boot_img_hdr_pxa *hdr_pxa; /* Samsung PXA header */
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boot_img_hdr_vnd_v3 *vnd; /* AOSP vendor v3 header */
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boot_img_hdr_vnd_v3 *v3_vnd; /* AOSP vendor v3 header */
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boot_img_hdr_vnd_v4 *v4_vnd; /* AOSP vendor v4 header */
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void *raw; /* Raw pointer */
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};
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@ -415,7 +514,7 @@ private:
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, vnd)
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#define impl_val(name) __impl_val(name, v3_vnd)
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struct dyn_img_vnd_v3 : public dyn_img_hdr {
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impl_cls(vnd_v3)
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@ -431,7 +530,21 @@ struct dyn_img_vnd_v3 : public dyn_img_hdr {
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size_t hdr_space() override { auto sz = page_size(); return do_align(hdr_size(), sz); }
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// Make API compatible
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char *extra_cmdline() override { return &vnd->cmdline[BOOT_ARGS_SIZE]; }
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char *extra_cmdline() override { return &v3_vnd->cmdline[BOOT_ARGS_SIZE]; }
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, v4_hdr)
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struct dyn_img_v4 : public dyn_img_v3 {
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impl_cls(v4)
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, v4_vnd)
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struct dyn_img_vnd_v4 : public dyn_img_vnd_v3 {
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impl_cls(vnd_v4)
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};
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#undef __impl_cls
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