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https://en.wikipedia.org/wiki/GUID_Partition_Table
https://android.googlesource.com/platform/hardware/libhardware/+/master/include/hardware/boot_control.h
https://android.googlesource.com/platform/hardware/qcom/bootctrl/+/nougat-mr1-dev/boot_control.cpp
https://android.googlesource.com/device/google/marlin/+/nougat-dr1-release/recovery/oem-recovery/gpt-utils.h
https://android.googlesource.com/device/google/marlin/+/nougat-mr1-dev/recovery/oem-recovery/gpt-utils.cpp
gpt-utils.h
/****************************************************************************** * GPT HEADER DEFINES ******************************************************************************/ #define GPT_SIGNATURE "EFI PART" #define HEADER_SIZE_OFFSET 12 #define HEADER_CRC_OFFSET 16 #define PRIMARY_HEADER_OFFSET 24 #define BACKUP_HEADER_OFFSET 32 #define FIRST_USABLE_LBA_OFFSET 40 #define LAST_USABLE_LBA_OFFSET 48 #define PENTRIES_OFFSET 72 #define PARTITION_COUNT_OFFSET 80 #define PENTRY_SIZE_OFFSET 84 #define PARTITION_CRC_OFFSET 88 #define TYPE_GUID_OFFSET 0 #define TYPE_GUID_SIZE 16 #define PTN_ENTRY_SIZE 128 #define UNIQUE_GUID_OFFSET 16 #define FIRST_LBA_OFFSET 32 #define LAST_LBA_OFFSET 40 #define ATTRIBUTE_FLAG_OFFSET 48 ★ #define PARTITION_NAME_OFFSET 56 #define MAX_GPT_NAME_SIZE 72 /****************************************************************************** * AB RELATED DEFINES ******************************************************************************/ //Bit 48 onwords in the attribute field are the ones where we are allowed to //store our AB attributes. #define AB_FLAG_OFFSET (ATTRIBUTE_FLAG_OFFSET + 6) ★ #define GPT_DISK_INIT_MAGIC 0xABCD #define AB_PARTITION_ATTR_SLOT_ACTIVE (0x1<<2) ★ #define AB_PARTITION_ATTR_BOOT_SUCCESSFUL (0x1<<6) #define AB_PARTITION_ATTR_UNBOOTABLE (0x1<<7) #define AB_SLOT_ACTIVE_VAL 0x3F ★ #define AB_SLOT_INACTIVE_VAL 0x0 #define AB_SLOT_ACTIVE 1 #define AB_SLOT_INACTIVE 0 #define AB_SLOT_A_SUFFIX "_a" #define AB_SLOT_B_SUFFIX "_b"
boot_control.cpp
#define SLOT_ACTIVE 1
#define SLOT_INACTIVE 2
#define UPDATE_SLOT(pentry, guid, slot_state) ({ \
memcpy(pentry, guid, TYPE_GUID_SIZE); \
if (slot_state == SLOT_ACTIVE)\
*(pentry + AB_FLAG_OFFSET) = AB_SLOT_ACTIVE_VAL; ★54バイト目に0x3Fを代入する 0011 1111
else if (slot_state == SLOT_INACTIVE) \
*(pentry + AB_FLAG_OFFSET) = (*(pentry + AB_FLAG_OFFSET)& \
~AB_PARTITION_ATTR_SLOT_ACTIVE); \ ★54バイト目のbit2のみゼロを代入する XXXX X0XX
})
//Get the value of one of the attribute fields for a partition.
static int get_partition_attribute(char *partname,
enum part_attr_type part_attr)
{
struct gpt_disk *disk = NULL;
uint8_t *pentry = NULL;
int retval = -1;
uint8_t *attr = NULL;
if (!partname)
goto error;
disk = gpt_disk_alloc();
if (!disk) {
ALOGE("%s: Failed to alloc disk struct", __func__);
goto error;
}
if (gpt_disk_get_disk_info(partname, disk)) {
ALOGE("%s: Failed to get disk info", __func__);
goto error;
}
pentry = gpt_disk_get_pentry(disk, partname, PRIMARY_GPT);
if (!pentry) {
ALOGE("%s: pentry does not exist in disk struct",
__func__);
goto error;
}
attr = pentry + AB_FLAG_OFFSET;
if (part_attr == ATTR_SLOT_ACTIVE)
retval = !!(*attr & AB_PARTITION_ATTR_SLOT_ACTIVE); ★54バイト目のbit2が1であれば XXXX X1XX SLOT_ACTIVE
else if (part_attr == ATTR_BOOT_SUCCESSFUL)
retval = !!(*attr & AB_PARTITION_ATTR_BOOT_SUCCESSFUL);★54バイト目のbit6が1であれば X1XX XXXX BOOT_SUCCESSFUL
else if (part_attr == ATTR_UNBOOTABLE)
retval = !!(*attr & AB_PARTITION_ATTR_UNBOOTABLE); ★54バイト目のbit7が1であれば 1XXX XXXX UNBOOTABLE
else
retval = -1;
gpt_disk_free(disk);
return retval;
error:
if (disk)
gpt_disk_free(disk);
return retval;
}
★54バイト目のbit2が1であれば XXXX X1XX SLOT_ACTIVE
modemst1 modemst2 bspdata rf_nv securefs deviceinfo fsc fsg modem_a NON-HLOS.bin modem_b xbl_a xbl.elf xbl_b tz_a tz.mbn tz_b rpm_a rpm.mbn rpm_b hyp_a hyp.mbn hyp_b pmic_a pmic.elf pmic_b keymaster_a km4.mbn keymaster_b cmnlib_a cmnlib.mbn cmnlib64_a cmnlib64.mbn cmnlib_b cmnlib64_b mdtpsecapp_a mdtpsecapp.mbn mdtpsecapp_b dsp_a dspso.bin dsp_b abl_a abl.elf ? abl_service.elf abl_b bluetooth_a BTFM.bin bluetooth_b devinfo mdtp_a mdtp.img mdtp_b dip apdp msadp dpo limits toolsfv sec storsec ddr battprof vbmeta_a vbmeta.img vbmeta_b devcfg_a devcfg.mbn devcfg_b boot_a boot.img (xbl.elf ???) boot_b reserved logbk box hwcfg nvcust nvdef_a NV-default.mbn nvdef_b sutinfo systeminfo_a systeminfo.img systeminfo_b hidden_a hidden.img.ext4 hidden_b splash_a splash.img splash_b splash2 elabel reserved_bak persist misc logfs ssd keystore frp logdump sti system_a system.img system_b system_other.img vendor_a vendor.img vendor_b odm_a odm.img odm_b product_a product.img product_b kitting fota durable tombstones shbootlog resetlog chameleon dtbo_a dtbo.img dtbo_b userdata
