AVB can reuse already loaded images instead of loading them from the disk.
The get_preloaded_partition now looks for the env. variables set by the 'abootimg load' to find the correct partition in RAM.
Signed-off-by: Roman Stratiienko r.stratiienko@gmail.com --- common/avb_verify.c | 53 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)
diff --git a/common/avb_verify.c b/common/avb_verify.c index cff9117d92..d2626e8844 100644 --- a/common/avb_verify.c +++ b/common/avb_verify.c @@ -6,6 +6,7 @@ #include <avb_verify.h> #include <blk.h> #include <cpu_func.h> +#include <env.h> #include <image.h> #include <malloc.h> #include <part.h> @@ -595,6 +596,55 @@ static AvbIOResult read_from_partition(AvbOps *ops, num_bytes, buffer, out_num_read, IO_READ); }
+#ifdef CONFIG_ANDROID_BOOT_IMAGE +/** + * get_preloaded_partition() - Gets the starting pointer of a partition that + * is pre-loaded in memory, and save it to |out_pointer|. + * + * If the partition is not pre-loaded in memory, the out_pointer shall not be + * modified. + * + * @ops: contains AVB ops handlers + * @partition: partition name, NUL-terminated UTF-8 string + * @num_bytes: amount of bytes to read + * @out_pointer: pointer to the starting address of the partition + * @out_num_bytes_preloaded: amount of bytes pre-loaded in memory + * + * @return: + * AVB_IO_RESULT_OK, if partition was found or was not found + * + */ +static AvbIOResult get_preloaded_partition(AvbOps *ops, const char *partition, size_t num_bytes, + uint8_t **out_pointer, size_t *out_num_bytes_preloaded) +{ + size_t partition_start = 0; + size_t partition_size = 0; + char env_name[64]; + + sprintf(env_name, "abootimg_%s_ptr", partition); + partition_start = env_get_hex(env_name, 0); + + sprintf(env_name, "abootimg_%s_size", partition); + partition_size = env_get_hex(env_name, 0); + + if (partition_start == 0 || partition_size == 0) + return AVB_IO_RESULT_OK; + + if (partition_size < num_bytes) { + printf("AVB: Preloaded partition %s size %zu is smaller than requested %zu\n", + partition, partition_size, num_bytes); + return AVB_IO_RESULT_ERROR_IO; + } + + *out_pointer = (uint8_t *)partition_start; + *out_num_bytes_preloaded = partition_size; + + printf("AVB: Using preloaded partition %s at %p\n", partition, *out_pointer); + + return AVB_IO_RESULT_OK; +} +#endif + /** * write_to_partition() - writes N bytes to a partition identified by a string * name @@ -1043,6 +1093,9 @@ AvbOps *avb_ops_alloc(int boot_device) ops_data->ops.user_data = ops_data;
ops_data->ops.read_from_partition = read_from_partition; +#ifdef CONFIG_ANDROID_BOOT_IMAGE + ops_data->ops.get_preloaded_partition = get_preloaded_partition; +#endif ops_data->ops.write_to_partition = write_to_partition; ops_data->ops.validate_vbmeta_public_key = validate_vbmeta_public_key; ops_data->ops.read_rollback_index = read_rollback_index;