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/*
* Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <libfdt.h>
#include <common/fdt_wrappers.h>
#include <plat/arm/common/arm_dyn_cfg_helpers.h>
#include <plat/arm/common/plat_arm.h>
#define DTB_PROP_MBEDTLS_HEAP_ADDR "mbedtls_heap_addr"
#define DTB_PROP_MBEDTLS_HEAP_SIZE "mbedtls_heap_size"
#if MEASURED_BOOT
#define DTB_PROP_BL2_HASH_DATA "bl2_hash_data"
static int dtb_root = -1;
#endif /* MEASURED_BOOT */
/*******************************************************************************
* Validate the tb_fw_config is a valid DTB file and returns the node offset
* to "arm,tb_fw" property.
* Arguments:
* void *dtb - pointer to the TB_FW_CONFIG in memory
* int *node - Returns the node offset to "arm,tb_fw" property if found.
*
* Returns 0 on success and -1 on error.
******************************************************************************/
int arm_dyn_tb_fw_cfg_init(void *dtb, int *node)
{
assert(dtb != NULL);
assert(node != NULL);
/* Check if the pointer to DT is correct */
if (fdt_check_header(dtb) != 0) {
WARN("Invalid DTB file passed as TB_FW_CONFIG\n");
return -1;
}
/* Assert the node offset point to "arm,tb_fw" compatible property */
*node = fdt_node_offset_by_compatible(dtb, -1, "arm,tb_fw");
if (*node < 0) {
WARN("The compatible property `arm,tb_fw` not found in the config\n");
return -1;
}
VERBOSE("Dyn cfg: Found \"arm,tb_fw\" in the config\n");
return 0;
}
/*
* This function writes the Mbed TLS heap address and size in the DTB. When it
* is called, it is guaranteed that a DTB is available. However it is not
* guaranteed that the shared Mbed TLS heap implementation is used. Thus we
* return error code from here and it's the responsibility of the caller to
* determine the action upon error.
*
* This function is supposed to be called only by BL1.
*
* Returns:
* 0 = success
* -1 = error
*/
int arm_set_dtb_mbedtls_heap_info(void *dtb, void *heap_addr, size_t heap_size)
{
#if !MEASURED_BOOT
int dtb_root;
#endif
/*
* Verify that the DTB is valid, before attempting to write to it,
* and get the DTB root node.
*/
int err = arm_dyn_tb_fw_cfg_init(dtb, &dtb_root);
if (err < 0) {
ERROR("Invalid TB_FW_CONFIG loaded. Unable to get root node\n");
return -1;
}
/*
* Write the heap address and size in the DTB.
*
* NOTE: The variables heap_addr and heap_size are corrupted
* by the "fdtw_write_inplace_cells" function. After the
* function calls they must NOT be reused.
*/
err = fdtw_write_inplace_cells(dtb, dtb_root,
DTB_PROP_MBEDTLS_HEAP_ADDR, 2, &heap_addr);
if (err < 0) {
ERROR("Unable to write DTB property %s\n",
DTB_PROP_MBEDTLS_HEAP_ADDR);
return -1;
}
err = fdtw_write_inplace_cells(dtb, dtb_root,
DTB_PROP_MBEDTLS_HEAP_SIZE, 1, &heap_size);
if (err < 0) {
ERROR("Unable to write DTB property %s\n",
DTB_PROP_MBEDTLS_HEAP_SIZE);
return -1;
}
return 0;
}
#if MEASURED_BOOT
/*
* This function writes the BL2 hash data in HW_FW_CONFIG DTB.
* When it is called, it is guaranteed that a DTB is available.
*
* This function is supposed to be called only by BL1.
*
* Returns:
* 0 = success
* < 0 = error
*/
int arm_set_bl2_hash_info(void *dtb, void *data)
{
assert(dtb_root >= 0);
/*
* Write the BL2 hash data in the DTB.
*/
return fdtw_write_inplace_bytes(dtb, dtb_root, DTB_PROP_BL2_HASH_DATA,
TCG_DIGEST_SIZE, data);
}
#endif /* MEASURED_BOOT */