Support shared Mbed TLS heap for SGI

Change-Id: Iac454c745543842bfeed004aee7a3f4fb94d37e1
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>

plat/arm/css/sgi/fdts/sgi575_tb_fw_config.dts

@@ -11,4 +11,15 @@
 	compatible = "arm,tb_fw";
 	hw_config_addr = <0x0 0xFEF00000>;
 	hw_config_max_size = <0x0100000>;
+	/*
+	 * 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/css/sgi/sgi_plat.c

@@ -6,6 +6,7 @@
 
 #include <arm_def.h>
 #include <arm_spm_def.h>
+#include <assert.h>
 #include <bl_common.h>
 #include <ccn.h>
 #include <debug.h>
@@ -63,6 +64,9 @@ const mmap_region_t plat_arm_mmap[] = {
 #endif
 #if ENABLE_SPM
 	ARM_SP_IMAGE_MMAP,
+#endif
+#if TRUSTED_BOARD_BOOT && LOAD_IMAGE_V2 && !BL2_AT_EL3
+	ARM_MAP_BL1_RW,
 #endif
 	{0}
 };
@@ -143,3 +147,13 @@ const struct secure_partition_boot_info *plat_get_secure_partition_boot_info(
 	return &plat_arm_secure_partition_boot_info;
 }
 #endif /* ENABLE_SPM && defined(IMAGE_BL31) */
+
+#if TRUSTED_BOARD_BOOT && LOAD_IMAGE_V2
+int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
+{
+	assert(heap_addr != NULL);
+	assert(heap_size != NULL);
+
+	return arm_get_mbedtls_heap(heap_addr, heap_size);
+}
+#endif