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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>
91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
/*
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* Copyright (c) 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 <arch_helpers.h>
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#include <assert.h>
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#include <bl_common.h>
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#include <debug.h>
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#include <errno.h>
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#if TRUSTED_BOARD_BOOT
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#include <mbedtls_config.h>
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#endif
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#include <platform.h>
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/*
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* The following platform functions are weakly defined. The Platforms
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* may redefine with strong definition.
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*/
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#pragma weak bl2_el3_plat_prepare_exit
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#pragma weak plat_error_handler
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#pragma weak bl2_plat_preload_setup
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#pragma weak bl2_plat_handle_pre_image_load
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#pragma weak bl2_plat_handle_post_image_load
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#pragma weak plat_try_next_boot_source
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#pragma weak plat_get_mbedtls_heap
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void bl2_el3_plat_prepare_exit(void)
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{
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}
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void __dead2 plat_error_handler(int err)
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{
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while (1)
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wfi();
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}
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void bl2_plat_preload_setup(void)
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{
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}
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#if LOAD_IMAGE_V2
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int bl2_plat_handle_pre_image_load(unsigned int image_id)
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{
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return 0;
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}
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int bl2_plat_handle_post_image_load(unsigned int image_id)
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{
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return 0;
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}
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#endif
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int plat_try_next_boot_source(void)
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{
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return 0;
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}
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#if !ERROR_DEPRECATED
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#pragma weak bl2_early_platform_setup2
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/*
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* The following platform API implementation that allow compatibility for
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* the older platform APIs.
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*/
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void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1,
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u_register_t arg2, u_register_t arg3)
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{
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bl2_early_platform_setup((void *)arg1);
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}
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#endif
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#if TRUSTED_BOARD_BOOT
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/*
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* The following default implementation of the function simply returns the
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* by-default allocated heap.
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*/
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int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
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{
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static unsigned char heap[TF_MBEDTLS_HEAP_SIZE];
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assert(heap_addr != NULL);
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assert(heap_size != NULL);
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*heap_addr = heap;
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*heap_size = sizeof(heap);
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return 0;
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}
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#endif /* TRUSTED_BOARD_BOOT */
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