Juno: Use shared mbedtls heap between bl1 and bl2

Change-Id: Ia1ecad58ebf9de3f3a44b17ad1de57424b431125
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>

plat/arm/board/juno/fdts/juno_tb_fw_config.dts

@@ -11,4 +11,15 @@
 	compatible = "arm,tb_fw";
 	/* Disable authentication for development */
 	disable_auth = <0x0>;
+	/*
+	 * The following two entries are placeholders for Mbed TLS
+	 * heap information. The default values don't matter since
+	 * they will be overwritten by BL1.
+	 * In case of having shared Mbed TLS heap between BL1 and BL2,
+	 * BL1 will populate these two properties with the respective
+	 * info about the shared heap. This info will be available for
+	 * BL2 in order to locate and re-use the heap.
+	 */
+	mbedtls_heap_addr = <0x0 0x0>;
+	mbedtls_heap_size = <0x0>;
 };

plat/arm/board/juno/juno_common.c

 /*
- * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -46,6 +46,9 @@ const mmap_region_t plat_arm_mmap[] = {
 #ifdef SPD_opteed
 	ARM_MAP_OPTEE_CORE_MEM,
 	ARM_OPTEE_PAGEABLE_LOAD_MEM,
+#endif
+#if TRUSTED_BOARD_BOOT && !BL2_AT_EL3
+	ARM_MAP_BL1_RW,
 #endif
 	{0}
 };

plat/arm/board/juno/juno_security.c

@@ -3,6 +3,7 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
+#include <assert.h>
 
 #include <common/debug.h>
 #include <drivers/arm/nic_400.h>
@@ -149,6 +150,9 @@ void plat_arm_security_setup(void)
 #if TRUSTED_BOARD_BOOT
 int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
 {
-	return get_mbedtls_heap_helper(heap_addr, heap_size);
+	assert(heap_addr != NULL);
+	assert(heap_size != NULL);
+
+	return arm_get_mbedtls_heap(heap_addr, heap_size);
 }
 #endif