AArch32: Add ARM platform changes in BL2

This patch adds ARM platform changes in BL2 for AArch32 state.
It instantiates a descriptor array for ARM platforms describing
image and entrypoint information for `SCP_BL2`, `BL32` and `BL33`.
It also enables building of BL2 for ARCH=aarch32.

Change-Id: I60dc7a284311eceba401fc789311c50ac746c51e

Makefile

@@ -522,13 +522,13 @@ NEED_BL1 := yes
 include bl1/bl1.mk
 endif
 
-# For AArch32, BL31 is not applicable, and BL2 & BL2U are not supported at present.
-ifneq (${ARCH},aarch32)
 ifdef BL2_SOURCES
 NEED_BL2 := yes
 include bl2/bl2.mk
 endif
 
+# For AArch32, BL31 is not applicable, and BL2U is not supported at present.
+ifneq (${ARCH},aarch32)
 ifdef BL2U_SOURCES
 NEED_BL2U := yes
 include bl2u/bl2u.mk

plat/arm/board/fvp/platform.mk

@@ -126,7 +126,7 @@ BL1_SOURCES		+=	drivers/io/io_semihosting.c			\
 BL2_SOURCES		+=	drivers/io/io_semihosting.c			\
 				drivers/delay_timer/delay_timer.c		\
 				lib/semihosting/semihosting.c			\
-				lib/semihosting/aarch64/semihosting_call.S	\
+				lib/semihosting/${ARCH}/semihosting_call.S	\
 				plat/arm/board/fvp/fvp_bl2_setup.c		\
 				plat/arm/board/fvp/fvp_err.c			\
 				plat/arm/board/fvp/fvp_io_storage.c		\

plat/arm/common/aarch32/arm_bl2_mem_params_desc.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <bl_common.h>
+#include <desc_image_load.h>
+#include <platform.h>
+#include <platform_def.h>
+
+
+/*******************************************************************************
+ * Following descriptor provides BL image/ep information that gets used
+ * by BL2 to load the images and also subset of this information is
+ * passed to next BL image. The image loading sequence is managed by
+ * populating the images in required loading order. The image execution
+ * sequence is managed by populating the `next_handoff_image_id` with
+ * the next executable image id.
+ ******************************************************************************/
+static bl_mem_params_node_t bl2_mem_params_descs[] = {
+#ifdef SCP_BL2_BASE
+	/* Fill SCP_BL2 related information if it exists */
+    {
+	    .image_id = SCP_BL2_IMAGE_ID,
+
+	    SET_STATIC_PARAM_HEAD(ep_info, PARAM_IMAGE_BINARY,
+		    VERSION_2, entry_point_info_t, SECURE | NON_EXECUTABLE),
+
+	    SET_STATIC_PARAM_HEAD(image_info, PARAM_IMAGE_BINARY,
+		    VERSION_2, image_info_t, 0),
+	    .image_info.image_base = SCP_BL2_BASE,
+	    .image_info.image_max_size = PLAT_CSS_MAX_SCP_BL2_SIZE,
+
+	    .next_handoff_image_id = INVALID_IMAGE_ID,
+    },
+#endif /* SCP_BL2_BASE */
+
+	/* Fill BL32 related information */
+    {
+	    .image_id = BL32_IMAGE_ID,
+
+	    SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
+		    VERSION_2, entry_point_info_t,
+		    SECURE | EXECUTABLE | EP_FIRST_EXE),
+	    .ep_info.pc = BL32_BASE,
+	    .ep_info.spsr = SPSR_MODE32(MODE32_mon, SPSR_T_ARM,
+		    SPSR_E_LITTLE, DISABLE_ALL_EXCEPTIONS),
+
+	    SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+		    VERSION_2, image_info_t, IMAGE_ATTRIB_PLAT_SETUP),
+	    .image_info.image_base = BL32_BASE,
+	    .image_info.image_max_size = BL32_LIMIT - BL32_BASE,
+
+	    .next_handoff_image_id = BL33_IMAGE_ID,
+    },
+
+	/* Fill BL33 related information */
+    {
+	    .image_id = BL33_IMAGE_ID,
+
+	    SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
+		    VERSION_2, entry_point_info_t, NON_SECURE | EXECUTABLE),
+#ifdef PRELOADED_BL33_BASE
+	    .ep_info.pc = PRELOADED_BL33_BASE,
+
+	    SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+		    VERSION_2, image_info_t, IMAGE_ATTRIB_SKIP_LOADING),
+#else
+	    .ep_info.pc = PLAT_ARM_NS_IMAGE_OFFSET,
+
+	    SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+		    VERSION_2, image_info_t, 0),
+	    .image_info.image_base = PLAT_ARM_NS_IMAGE_OFFSET,
+	    .image_info.image_max_size = ARM_DRAM1_SIZE,
+#endif /* PRELOADED_BL33_BASE */
+
+	    .next_handoff_image_id = INVALID_IMAGE_ID,
+    }
+};
+
+REGISTER_BL_IMAGE_DESCS(bl2_mem_params_descs)

plat/arm/common/arm_bl2_setup.c

@@ -246,7 +246,12 @@ void arm_bl2_plat_arch_setup(void)
 			      BL2_COHERENT_RAM_LIMIT
 #endif
 			      );
+
+#ifdef AARCH32
+	enable_mmu_secure(0);
+#else
 	enable_mmu_el1(0);
+#endif
 }
 
 void bl2_plat_arch_setup(void)
@@ -266,9 +271,11 @@ int bl2_plat_handle_post_image_load(unsigned int image_id)
 	assert(bl_mem_params);
 
 	switch (image_id) {
+#ifdef AARCH64
 	case BL32_IMAGE_ID:
 		bl_mem_params->ep_info.spsr = arm_get_spsr_for_bl32_entry();
 		break;
+#endif
 
 	case BL33_IMAGE_ID:
 		/* BL33 expects to receive the primary CPU MPID (through r0) */

plat/arm/common/arm_common.mk

@@ -128,7 +128,7 @@ BL2_SOURCES		+=	drivers/io/io_fip.c				\
 				drivers/io/io_storage.c				\
 				plat/arm/common/arm_bl2_setup.c			\
 				plat/arm/common/arm_io_storage.c		\
-				plat/common/aarch64/platform_up_stack.S
+				plat/common/${ARCH}/platform_up_stack.S
 ifeq (${LOAD_IMAGE_V2},1)
 BL2_SOURCES		+=	plat/arm/common/${ARCH}/arm_bl2_mem_params_desc.c\
 				plat/arm/common/arm_image_load.c		\