#author("2019-10-01T23:38:25+09:00","","")
#author("2019-10-12T15:34:44+09:00","","")
#nofollow
#norelated
総数:&counter(total); 今日:&counter(today); 昨日:&counter(yesterday);

* もくじ [#dd69c13e]

#contents

https://en.wikipedia.org/wiki/GUID_Partition_Table &br;
https://android.googlesource.com/platform/hardware/libhardware/+/master/include/hardware/boot_control.h &br;
https://android.googlesource.com/platform/hardware/qcom/bootctrl/+/nougat-mr1-dev/boot_control.cpp &br;
https://android.googlesource.com/device/google/marlin/+/nougat-dr1-release/recovery/oem-recovery/gpt-utils.h &br;
https://android.googlesource.com/device/google/marlin/+/nougat-mr1-dev/recovery/oem-recovery/gpt-utils.cpp &br;

gpt-utils.h &br;
 /******************************************************************************
  * 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 &br;
 #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


*partition name and filename [#w0b94c25]
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


*simg2img [#kd12cc86]
https://pkgs.org/download/simg2img
トップ   差分 バックアップ リロード   一覧 単語検索 最終更新   ヘルプ   最終更新のRSS