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/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __FSL_AVB_H__
#define __FSL_AVB_H__
#include <libavb.h>
/* Reads |num_bytes| from offset |offset| from partition with name
* |partition| (NUL-terminated UTF-8 string). If |offset| is
* negative, its absolute value should be interpreted as the number
* of bytes from the end of the partition.
*
* This function returns AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION if
* there is no partition with the given name,
* AVB_IO_RESULT_ERROR_RANGE_OUTSIDE_PARTITION if the requested
* |offset| is outside the partition, and AVB_IO_RESULT_ERROR_IO if
* there was an I/O error from the underlying I/O subsystem. If the
* operation succeeds as requested AVB_IO_RESULT_OK is returned and
* the data is available in |buffer|.
*
* The only time partial I/O may occur is if reading beyond the end
* of the partition. In this case the value returned in
* |out_num_read| may be smaller than |num_bytes|.
*/
AvbIOResult fsl_read_from_partition(AvbOps* ops, const char* partition,
int64_t offset, size_t num_bytes,
void* buffer, size_t* out_num_read);
/* multi block read version
* */
AvbIOResult fsl_read_from_partition_multi(AvbOps* ops, const char* partition,
int64_t offset, size_t num_bytes,
void* buffer, size_t* out_num_read);
/* Writes |num_bytes| from |bffer| at offset |offset| to partition
* with name |partition| (NUL-terminated UTF-8 string). If |offset|
* is negative, its absolute value should be interpreted as the
* number of bytes from the end of the partition.
*
* This function returns AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION if
* there is no partition with the given name,
* AVB_IO_RESULT_ERROR_RANGE_OUTSIDE_PARTITION if the requested
* byterange goes outside the partition, and AVB_IO_RESULT_ERROR_IO
* if there was an I/O error from the underlying I/O subsystem. If
* the operation succeeds as requested AVB_IO_RESULT_OK is
* returned.
*
* This function never does any partial I/O, it either transfers all
* of the requested bytes or returns an error.
*/
AvbIOResult fsl_write_to_partition(AvbOps* ops, const char* partition,
int64_t offset, size_t num_bytes,
const void* buffer);
/* Reads A/B metadata from persistent storage. Returned data is
* properly byteswapped. Returns AVB_IO_RESULT_OK on success, error
* code otherwise.
*
* If the data read is invalid (e.g. wrong magic or CRC checksum
* failure), the metadata shoule be reset using avb_ab_data_init()
* and then written to persistent storage.
*
* Implementations will typically want to use avb_ab_data_read()
* here to use the 'misc' partition for persistent storage.
*/
AvbIOResult fsl_read_ab_metadata(AvbOps* ops, struct AvbABData* data);
/* Writes A/B metadata to persistent storage. This will byteswap and
* update the CRC as needed. Returns AVB_IO_RESULT_OK on success,
* error code otherwise.
*
* Implementations will typically want to use avb_ab_data_write()
* here to use the 'misc' partition for persistent storage.
*/
AvbIOResult fsl_write_ab_metadata(AvbOps* ops, const struct AvbABData* data);
/* Checks if the given public key used to sign the 'vbmeta'
* partition is trusted. Boot loaders typically compare this with
* embedded key material generated with 'avbtool
* extract_public_key'.
*
* If AVB_IO_RESULT_OK is returned then |out_is_trusted| is set -
* true if trusted or false if untrusted.
*/
AvbIOResult fsl_validate_vbmeta_public_key(AvbOps* ops,
const uint8_t* public_key_data,
size_t public_key_length,
bool* out_is_trusted);
/* Gets the rollback index corresponding to the slot given by
* |rollback_index_slot|. The value is returned in
* |out_rollback_index|. Returns AVB_IO_RESULT_OK if the rollback
* index was retrieved, otherwise an error code.
*
* A device may have a limited amount of rollback index slots (say,
* one or four) so may error out if |rollback_index_slot| exceeds
* this number.
*/
AvbIOResult fsl_read_rollback_index(AvbOps* ops, size_t rollback_index_slot,
uint64_t* out_rollback_index);
/* Sets the rollback index corresponding to the slot given by
* |rollback_index_slot| to |rollback_index|. Returns
* AVB_IO_RESULT_OK if the rollback index was set, otherwise an
* error code.
*
* A device may have a limited amount of rollback index slots (say,
* one or four) so may error out if |rollback_index_slot| exceeds
* this number.
*/
AvbIOResult fsl_write_rollback_index(AvbOps* ops, size_t rollback_index_slot,
uint64_t rollback_index);
/* Gets whether the device is unlocked. The value is returned in
* |out_is_unlocked| (true if unlocked, false otherwise). Returns
* AVB_IO_RESULT_OK if the state was retrieved, otherwise an error
* code.
*/
AvbIOResult fsl_read_is_device_unlocked(AvbOps* ops, bool* out_is_unlocked);
/* Gets the unique partition GUID for a partition with name in
* |partition| (NUL-terminated UTF-8 string). The GUID is copied as
* a string into |guid_buf| of size |guid_buf_size| and will be NUL
* terminated. The string must be lower-case and properly
* hyphenated. For example:
*
* 527c1c6d-6361-4593-8842-3c78fcd39219
*
* Returns AVB_IO_RESULT_OK on success, otherwise an error code.
*/
AvbIOResult fsl_get_unique_guid_for_partition(AvbOps* ops,
const char* partition,
char* guid_buf,
size_t guid_buf_size);
/* check if the fastboot getvar cmd is for query [avb] bootctl's slot var
* cmd is the fastboot getvar's cmd in
* return true if it is a bootctl related cmd, false if it's not.
* */
bool is_slotvar_avb(char *cmd);
/* return 0 for the first slot
* return 1 for the second slot
* return -1 for not supported slot
* */
int slotidx_from_suffix(char *suffix);
/* return fastboot's getvar cmd response
* cmd is the fastboot getvar's cmd in
* if return 0, buffer is bootctl's slot var out
* if return -1, buffer is error string
* */
int get_slotvar_avb(AvbOps *ops, char *cmd, char *buffer, size_t size);
/* reset rollback_index part in avbkey partition
* used in the switch from LOCK to UNLOCK
* return 0 if success, non 0 if fail.
* */
int rbkidx_erase(const char * kblb_part);
/* init the avbkey partition, include the header/public key/rollback index
* for public key/rollback index part, use caam to do encrypt
* return 0 if success, non 0 if fail.
* */
int avbkeyblb_init(uint8_t *plainkey, uint32_t keylen, const char *kblb_part /*"avbkey"*/);
/* read a/b metadata to get curr slot
* return slot suffix '_a'/'_b' or NULL */
char *select_slot(AvbOps *ops);
#endif /* __FSL_AVB_H__ */
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