boot image header v4

This commit is contained in:
vvb2060 2021-05-08 22:32:51 +08:00 committed by John Wu
parent 0580932610
commit 439d497a13
2 changed files with 128 additions and 4 deletions

View File

@ -247,7 +247,15 @@ void boot_img::parse_image(uint8_t *addr, format_t type) {
auto hp = reinterpret_cast<boot_img_hdr*>(addr);
if (type == AOSP_VENDOR) {
fprintf(stderr, "VENDOR_BOOT_HDR\n");
hdr = new dyn_img_vnd_v3(addr);
switch (hp->header_version) {
case 4:
hdr = new dyn_img_vnd_v4(addr);
break;
case 3:
default:
hdr = new dyn_img_vnd_v3(addr);
break;
}
} else if (hp->page_size >= 0x02000000) {
fprintf(stderr, "PXA_BOOT_HDR\n");
hdr = new dyn_img_pxa(addr);
@ -276,6 +284,9 @@ void boot_img::parse_image(uint8_t *addr, format_t type) {
case 3:
hdr = new dyn_img_v3(addr);
break;
case 4:
hdr = new dyn_img_v4(addr);
break;
default:
hdr = new dyn_img_v0(addr);
break;

View File

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