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6d01a46334
The Mbed TLS drivers, in order to work, need a heap for internal usage. This heap, instead of being directly referenced by the drivers, now it is being accessed indirectly through a pointer. Also, the heap, instead of being part of the drivers, now it is being received through the plat_get_mbedtls_heap() function. This function requests a heap from the current BL image which utilises the Mbed TLS drivers. Those changes create the opportunity for the Mbed TLS heap to be shared among different images, thus saving memory. A default heap implementation is provided but it can be overridden by a platform specific, optimised implemenetation. Change-Id: I286a1f10097a9cdcbcd312201eea576c18d157fa Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>
54 lines
1 KiB
C
54 lines
1 KiB
C
/*
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* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <debug.h>
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/* mbed TLS headers */
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#include <mbedtls/memory_buffer_alloc.h>
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#include <mbedtls/platform.h>
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#include <mbedtls_common.h>
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#include <mbedtls_config.h>
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#include <platform.h>
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#include <stddef.h>
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static void cleanup(void)
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{
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ERROR("EXIT from BL2\n");
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panic();
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}
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/*
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* mbed TLS initialization function
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*/
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void mbedtls_init(void)
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{
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static int ready;
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void *heap_addr;
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size_t heap_size = 0;
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int err;
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if (!ready) {
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if (atexit(cleanup))
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panic();
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err = plat_get_mbedtls_heap(&heap_addr, &heap_size);
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/* Ensure heap setup is proper */
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if (err < 0) {
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ERROR("Mbed TLS failed to get a heap\n");
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panic();
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}
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assert(heap_size >= TF_MBEDTLS_HEAP_SIZE);
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/* Initialize the mbed TLS heap */
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mbedtls_memory_buffer_alloc_init(heap_addr, heap_size);
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#ifdef MBEDTLS_PLATFORM_SNPRINTF_ALT
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mbedtls_platform_set_snprintf(snprintf);
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#endif
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ready = 1;
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}
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}
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