dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-01 00:32:04 +02:00
Code Issues Packages Projects Releases Wiki Activity

avb2.0: implement AVB ops

Browse Source 
Implement AVB ops on top of existing mmc subsystem API. Currently there
is a full implementation of such operations, defined by [1]
AVB2.0 specification:

.read_from_partition() - reads N bytes from a partition identified by
a name.
.write_to_partition() - Writes N bytes to a partition identified by a name.
.validate_vbmeta_public_key() - checks if the given public ‘vbmeta’
partition is trusted.
.get_unique_guid_for_partition() - Gets the GUID for a partition identified
by a string name.

As [1] specification recommends to use tamper-evident storage for storing
rollback indexes and device state (LOCKED/UNLOCKED),
currently are only stubs instead of full implementation for these ops:
.read_rollback_index() - Gets the rollback index for a given index location
.write_rollback_index() - Sets the rollback index to a given location
.read_is_device_unlocked() - Gets where the device is unlocked

[1] https://android.googlesource.com/platform/external/avb/+/master/README.md

Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
This commit is contained in:
Igor Opaniuk
2018-06-03 21:56:38 +03:00
committed by Tom Rini
parent 3330584d2c
commit 3af30e4443
3 changed files with 691 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
include/avb_verify.h Normal file
View File

@@ -0,0 +1,79 @@
/*
* (C) Copyright 2018, Linaro Limited
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _AVB_VERIFY_H
#define _AVB_VERIFY_H
#include <../lib/libavb/libavb.h>
#include <mmc.h>
#define ALLOWED_BUF_ALIGN 8
struct AvbOpsData {
struct AvbOps ops;
int mmc_dev;
};
struct mmc_part {
int dev_num;
struct mmc *mmc;
struct blk_desc *mmc_blk;
disk_partition_t info;
};
enum mmc_io_type {
IO_READ,
IO_WRITE
};
AvbOps *avb_ops_alloc(int boot_device);
void avb_ops_free(AvbOps *ops);
/**
* ============================================================================
* I/O helper inline functions
* ============================================================================
*/
static inline uint64_t calc_offset(struct mmc_part *part, int64_t offset)
{
u64 part_size = part->info.size * part->info.blksz;
if (offset < 0)
return part_size + offset;
return offset;
}
static inline size_t get_sector_buf_size(void)
{
return (size_t)CONFIG_FASTBOOT_BUF_SIZE;
}
static inline void *get_sector_buf(void)
{
return (void *)CONFIG_FASTBOOT_BUF_ADDR;
}
static inline bool is_buf_unaligned(void *buffer)
{
return (bool)((uintptr_t)buffer % ALLOWED_BUF_ALIGN);
}
static inline int get_boot_device(AvbOps *ops)
{
struct AvbOpsData *data;
if (ops) {
data = ops->user_data;
if (data)
return data->mmc_dev;
}
return -1;
}
#endif /* _AVB_VERIFY_H */