bl2/bl2_main.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2013-2014, 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 <arch.h>
 #include <arch_helpers.h>
 #include <assert.h>
 #include <auth.h>
 #include <bl_common.h>
 #include <debug.h>
 #include <platform.h>
 #include <platform_def.h>
 #include "bl2_private.h"

 #if TRUSTED_BOARD_BOOT

 #ifdef BL32_BASE
 static int bl32_cert_error;
 #endif

 /*
  * Load and authenticate the key and content certificates for a BL3-x image
  *
  * Parameters:
  *   key_cert_blob: key certificate blob id (see auth.h)
  *   key_cert_name: key certificate filename
  *   cont_cert_blob: content certificate blob id (see auth.h)
  *   cont_cert_name: content certificate filename
  *   mem_layout: Trusted SRAM memory layout
  *   load_addr: load the certificates at this address
  *
  * Return: 0 = success, Otherwise = error
  */
 static int load_cert_bl3x(int key_cert_blob, const char *key_cert_name,
 			  int cont_cert_blob, const char *cont_cert_name,
 			  meminfo_t *mem_layout, uint64_t load_addr)
 {
 	image_info_t image_info;
 	int err;

 	/* Load Key certificate */
 	image_info.h.version = VERSION_1;
 	err = load_image(mem_layout, key_cert_name, load_addr, &image_info, NULL);
 	if (err) {
 		ERROR("Cannot load %s.\n", key_cert_name);
 		return err;
 	}

 	err = auth_verify_obj(key_cert_blob, image_info.image_base,
 			image_info.image_size);
 	if (err) {
 		ERROR("Invalid key certificate %s.\n", key_cert_name);
 		return err;
 	}

 	/* Load Content certificate */
 	image_info.h.version = VERSION_1;
 	err = load_image(mem_layout, cont_cert_name, load_addr, &image_info, NULL);
 	if (err) {
 		ERROR("Cannot load %s.\n", cont_cert_name);
 		return err;
 	}

 	err = auth_verify_obj(cont_cert_blob, image_info.image_base,
 			image_info.image_size);
 	if (err) {
 		ERROR("Invalid content certificate %s.\n", cont_cert_name);
 		return err;
 	}

 	return 0;
 }

 /*
  * Load and authenticate the Trusted Key certificate the key and content
  * certificates for each of the BL3-x images.
  *
  * Return: 0 = success, Otherwise = error
  */
 static int load_certs(void)
 {
 	const uint64_t load_addr = BL31_BASE;
 	image_info_t image_info;
 	meminfo_t *mem_layout;
 	int err;

 	/* Find out how much free trusted ram remains after BL2 load */
 	mem_layout = bl2_plat_sec_mem_layout();

 	/* Load the Trusted Key certificate in the BL31 region */
 	image_info.h.version = VERSION_1;
 	err = load_image(mem_layout, TRUSTED_KEY_CERT_NAME, load_addr,
 			 &image_info, NULL);
 	if (err) {
 		ERROR("Failed to load Trusted Key certificate.\n");
 		return err;
 	}

 	/* Validate the certificate */
 	err = auth_verify_obj(AUTH_TRUSTED_KEY_CERT, image_info.image_base,
 			image_info.image_size);
 	if (err) {
 		ERROR("Invalid Trusted Key certificate.\n");
 		return err;
 	}

 	/* Load and validate Key and Content certificates for BL3-x images */
 #ifdef BL30_BASE
 	err = load_cert_bl3x(AUTH_BL30_KEY_CERT, BL30_KEY_CERT_NAME,
 			     AUTH_BL30_IMG_CERT, BL30_CERT_NAME,
 			     mem_layout, load_addr);
 	if (err) {
 		ERROR("Failed to verify BL3-0 authenticity\n");
 		return err;
 	}
 #endif /* BL30_BASE */

 	err = load_cert_bl3x(AUTH_BL31_KEY_CERT, BL31_KEY_CERT_NAME,
 			     AUTH_BL31_IMG_CERT, BL31_CERT_NAME,
 			     mem_layout, load_addr);
 	if (err) {
 		ERROR("Failed to verify BL3-1 authenticity\n");
 		return err;
 	}

 #ifdef BL32_BASE
 	/* BL3-2 image is optional, but keep the return value in case the
 	 * image is present but the certificate is missing */
 	err = load_cert_bl3x(AUTH_BL32_KEY_CERT, BL32_KEY_CERT_NAME,
 			     AUTH_BL32_IMG_CERT, BL32_CERT_NAME,
 			     mem_layout, load_addr);
 	if (err) {
 		WARN("Failed to verify BL3-2 authenticity\n");
 	}
 	bl32_cert_error = err;
 #endif /* BL32_BASE */

 	err = load_cert_bl3x(AUTH_BL33_KEY_CERT, BL33_KEY_CERT_NAME,
 			     AUTH_BL33_IMG_CERT, BL33_CERT_NAME,
 			     mem_layout, load_addr);
 	if (err) {
 		ERROR("Failed to verify BL3-3 authenticity\n");
 		return err;
 	}

 	return 0;
 }

 #endif /* TRUSTED_BOARD_BOOT */

 /*******************************************************************************
  * Load the BL3-0 image if there's one.
  * If a platform does not want to attempt to load BL3-0 image it must leave
  * BL30_BASE undefined.
  * Return 0 on success or if there's no BL3-0 image to load, a negative error
  * code otherwise.
  ******************************************************************************/
 static int load_bl30(void)
 {
 	int e = 0;
 #ifdef BL30_BASE
 	meminfo_t bl30_mem_info;
 	image_info_t bl30_image_info;

 	/*
 	 * It is up to the platform to specify where BL3-0 should be loaded if
 	 * it exists. It could create space in the secure sram or point to a
 	 * completely different memory.
 	 *
 	 * The entry point information is not relevant in this case as the AP
 	 * won't execute the BL3-0 image.
 	 */
 	INFO("BL2: Loading BL3-0\n");
 	bl2_plat_get_bl30_meminfo(&bl30_mem_info);
 	bl30_image_info.h.version = VERSION_1;
 	e = load_image(&bl30_mem_info,
 		       BL30_IMAGE_NAME,
 		       BL30_BASE,
 		       &bl30_image_info,
 		       NULL);

 	if (e == 0) {
 #if TRUSTED_BOARD_BOOT
 		e = auth_verify_obj(AUTH_BL30_IMG,
 				bl30_image_info.image_base,
 				bl30_image_info.image_size);
 		if (e) {
 			ERROR("Failed to authenticate BL3-0 image.\n");
 			panic();
 		}

 		/* After working with data, invalidate the data cache */
 		inv_dcache_range(bl30_image_info.image_base,
 				 (size_t)bl30_image_info.image_size);
 #endif /* TRUSTED_BOARD_BOOT */

 		/* The subsequent handling of BL3-0 is platform specific */
 		bl2_plat_handle_bl30(&bl30_image_info);
 	}
 #endif /* BL30_BASE */

 	return e;
 }

 /*******************************************************************************
  * Load the BL3-1 image.
  * The bl2_to_bl31_params and bl31_ep_info params will be updated with the
  * relevant BL3-1 information.
  * Return 0 on success, a negative error code otherwise.
  ******************************************************************************/
 static int load_bl31(bl31_params_t *bl2_to_bl31_params,
 		     entry_point_info_t *bl31_ep_info)
 {
 	meminfo_t *bl2_tzram_layout;
 	int e;

 	INFO("BL2: Loading BL3-1\n");
 	assert(bl2_to_bl31_params != NULL);
 	assert(bl31_ep_info != NULL);

 	/* Find out how much free trusted ram remains after BL2 load */
 	bl2_tzram_layout = bl2_plat_sec_mem_layout();

 	/* Set the X0 parameter to BL3-1 */
 	bl31_ep_info->args.arg0 = (unsigned long)bl2_to_bl31_params;

 	/* Load the BL3-1 image */
 	e = load_image(bl2_tzram_layout,
 		       BL31_IMAGE_NAME,
 		       BL31_BASE,
 		       bl2_to_bl31_params->bl31_image_info,
 		       bl31_ep_info);

 	if (e == 0) {
 #if TRUSTED_BOARD_BOOT
 		e = auth_verify_obj(AUTH_BL31_IMG,
 			bl2_to_bl31_params->bl31_image_info->image_base,
 			bl2_to_bl31_params->bl31_image_info->image_size);
 		if (e) {
 			ERROR("Failed to authenticate BL3-1 image.\n");
 			panic();
 		}

 		/* After working with data, invalidate the data cache */
 		inv_dcache_range(bl2_to_bl31_params->bl31_image_info->image_base,
 			(size_t)bl2_to_bl31_params->bl31_image_info->image_size);
 #endif /* TRUSTED_BOARD_BOOT */

 		bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info,
 					  bl31_ep_info);
 	}

 	return e;
 }

 /*******************************************************************************
  * Load the BL3-2 image if there's one.
  * The bl2_to_bl31_params param will be updated with the relevant BL3-2
  * information.
  * If a platform does not want to attempt to load BL3-2 image it must leave
  * BL32_BASE undefined.
  * Return 0 on success or if there's no BL3-2 image to load, a negative error
  * code otherwise.
  ******************************************************************************/
 static int load_bl32(bl31_params_t *bl2_to_bl31_params)
 {
 	int e = 0;
 #ifdef BL32_BASE
 	meminfo_t bl32_mem_info;

 	INFO("BL2: Loading BL3-2\n");
 	assert(bl2_to_bl31_params != NULL);

 	/*
 	 * It is up to the platform to specify where BL3-2 should be loaded if
 	 * it exists. It could create space in the secure sram or point to a
 	 * completely different memory.
 	 */
 	bl2_plat_get_bl32_meminfo(&bl32_mem_info);
 	e = load_image(&bl32_mem_info,
 		       BL32_IMAGE_NAME,
 		       BL32_BASE,
 		       bl2_to_bl31_params->bl32_image_info,
 		       bl2_to_bl31_params->bl32_ep_info);

 	if (e == 0) {
 #if TRUSTED_BOARD_BOOT
 		/* Image is present. Check if there is a valid certificate */
 		if (bl32_cert_error) {
 			ERROR("Failed to authenticate BL3-2 certificates.\n");
 			panic();
 		}

 		e = auth_verify_obj(AUTH_BL32_IMG,
 			bl2_to_bl31_params->bl32_image_info->image_base,
 			bl2_to_bl31_params->bl32_image_info->image_size);
 		if (e) {
 			ERROR("Failed to authenticate BL3-2 image.\n");
 			panic();
 		}
 		/* After working with data, invalidate the data cache */
 		inv_dcache_range(bl2_to_bl31_params->bl32_image_info->image_base,
 			(size_t)bl2_to_bl31_params->bl32_image_info->image_size);
 #endif /* TRUSTED_BOARD_BOOT */

 		bl2_plat_set_bl32_ep_info(
 			bl2_to_bl31_params->bl32_image_info,
 			bl2_to_bl31_params->bl32_ep_info);
 	}
 #endif /* BL32_BASE */

 	return e;
 }

 /*******************************************************************************
  * Load the BL3-3 image.
  * The bl2_to_bl31_params param will be updated with the relevant BL3-3
  * information.
  * Return 0 on success, a negative error code otherwise.
  ******************************************************************************/
 static int load_bl33(bl31_params_t *bl2_to_bl31_params)
 {
 	meminfo_t bl33_mem_info;
 	int e;

 	INFO("BL2: Loading BL3-3\n");
 	assert(bl2_to_bl31_params != NULL);

 	bl2_plat_get_bl33_meminfo(&bl33_mem_info);

 	/* Load the BL3-3 image in non-secure memory provided by the platform */
 	e = load_image(&bl33_mem_info,
 		       BL33_IMAGE_NAME,
 		       plat_get_ns_image_entrypoint(),
 		       bl2_to_bl31_params->bl33_image_info,
 		       bl2_to_bl31_params->bl33_ep_info);

 	if (e == 0) {
 #if TRUSTED_BOARD_BOOT
 		e = auth_verify_obj(AUTH_BL33_IMG,
 				bl2_to_bl31_params->bl33_image_info->image_base,
 				bl2_to_bl31_params->bl33_image_info->image_size);
 		if (e) {
 			ERROR("Failed to authenticate BL3-3 image.\n");
 			panic();
 		}
 		/* After working with data, invalidate the data cache */
 		inv_dcache_range(bl2_to_bl31_params->bl33_image_info->image_base,
 			(size_t)bl2_to_bl31_params->bl33_image_info->image_size);
 #endif /* TRUSTED_BOARD_BOOT */

 		bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info,
 					  bl2_to_bl31_params->bl33_ep_info);
 	}

 	return e;
 }

 /*******************************************************************************
  * The only thing to do in BL2 is to load further images and pass control to
  * BL3-1. The memory occupied by BL2 will be reclaimed by BL3-x stages. BL2 runs
  * entirely in S-EL1.
  ******************************************************************************/
 void bl2_main(void)
 {
 	bl31_params_t *bl2_to_bl31_params;
 	entry_point_info_t *bl31_ep_info;
 	int e;

 	NOTICE("BL2: %s\n", version_string);
 	NOTICE("BL2: %s\n", build_message);

 	/* Perform remaining generic architectural setup in S-EL1 */
 	bl2_arch_setup();

 #if TRUSTED_BOARD_BOOT
 	/* Initialize authentication module */
 	auth_init();

 	/* Validate the certificates involved in the Chain of Trust */
 	e = load_certs();
 	if (e) {
 		ERROR("Chain of Trust invalid. Aborting...\n");
 		panic();
 	}
 #endif /* TRUSTED_BOARD_BOOT */

 	/*
 	 * Load the subsequent bootloader images
 	 */
 	e = load_bl30();
 	if (e) {
 		ERROR("Failed to load BL3-0 (%i)\n", e);
 		panic();
 	}

 	/* Perform platform setup in BL2 after loading BL3-0 */
 	bl2_platform_setup();

 	/*
 	 * Get a pointer to the memory the platform has set aside to pass
 	 * information to BL3-1.
 	 */
 	bl2_to_bl31_params = bl2_plat_get_bl31_params();
 	bl31_ep_info = bl2_plat_get_bl31_ep_info();

 	e = load_bl31(bl2_to_bl31_params, bl31_ep_info);
 	if (e) {
 		ERROR("Failed to load BL3-1 (%i)\n", e);
 		panic();
 	}

 	e = load_bl32(bl2_to_bl31_params);
 	if (e)
 		WARN("Failed to load BL3-2 (%i)\n", e);

 	e = load_bl33(bl2_to_bl31_params);
 	if (e) {
 		ERROR("Failed to load BL3-3 (%i)\n", e);
 		panic();
 	}

 	/* Flush the params to be passed to memory */
 	bl2_plat_flush_bl31_params();

 	/*
 	 * Run BL3-1 via an SMC to BL1. Information on how to pass control to
 	 * the BL3-2 (if present) and BL3-3 software images will be passed to
 	 * BL3-1 as an argument.
 	 */
 	smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0);
 }
	/*
	* Copyright (c) 2013-2014, 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 <arch.h>
	#include <arch_helpers.h>
	#include <assert.h>
	#include <auth.h>
	#include <bl_common.h>
	#include <debug.h>
	#include <platform.h>
	#include <platform_def.h>
	#include "bl2_private.h"

	#if TRUSTED_BOARD_BOOT

	#ifdef BL32_BASE
	static int bl32_cert_error;
	#endif

	/*
	* Load and authenticate the key and content certificates for a BL3-x image
	*
	* Parameters:
	* key_cert_blob: key certificate blob id (see auth.h)
	* key_cert_name: key certificate filename
	* cont_cert_blob: content certificate blob id (see auth.h)
	* cont_cert_name: content certificate filename
	* mem_layout: Trusted SRAM memory layout
	* load_addr: load the certificates at this address
	*
	* Return: 0 = success, Otherwise = error
	*/
	static int load_cert_bl3x(int key_cert_blob, const char *key_cert_name,
	int cont_cert_blob, const char *cont_cert_name,
	meminfo_t *mem_layout, uint64_t load_addr)
	{
	image_info_t image_info;
	int err;

	/* Load Key certificate */
	image_info.h.version = VERSION_1;
	err = load_image(mem_layout, key_cert_name, load_addr, &image_info, NULL);
	if (err) {
	ERROR("Cannot load %s.\n", key_cert_name);
	return err;
	}

	err = auth_verify_obj(key_cert_blob, image_info.image_base,
	image_info.image_size);
	if (err) {
	ERROR("Invalid key certificate %s.\n", key_cert_name);
	return err;
	}

	/* Load Content certificate */
	image_info.h.version = VERSION_1;
	err = load_image(mem_layout, cont_cert_name, load_addr, &image_info, NULL);
	if (err) {
	ERROR("Cannot load %s.\n", cont_cert_name);
	return err;
	}

	err = auth_verify_obj(cont_cert_blob, image_info.image_base,
	image_info.image_size);
	if (err) {
	ERROR("Invalid content certificate %s.\n", cont_cert_name);
	return err;
	}

	return 0;
	}

	/*
	* Load and authenticate the Trusted Key certificate the key and content
	* certificates for each of the BL3-x images.
	*
	* Return: 0 = success, Otherwise = error
	*/
	static int load_certs(void)
	{
	const uint64_t load_addr = BL31_BASE;
	image_info_t image_info;
	meminfo_t *mem_layout;
	int err;

	/* Find out how much free trusted ram remains after BL2 load */
	mem_layout = bl2_plat_sec_mem_layout();

	/* Load the Trusted Key certificate in the BL31 region */
	image_info.h.version = VERSION_1;
	err = load_image(mem_layout, TRUSTED_KEY_CERT_NAME, load_addr,
	&image_info, NULL);
	if (err) {
	ERROR("Failed to load Trusted Key certificate.\n");
	return err;
	}

	/* Validate the certificate */
	err = auth_verify_obj(AUTH_TRUSTED_KEY_CERT, image_info.image_base,
	image_info.image_size);
	if (err) {
	ERROR("Invalid Trusted Key certificate.\n");
	return err;
	}

	/* Load and validate Key and Content certificates for BL3-x images */
	#ifdef BL30_BASE
	err = load_cert_bl3x(AUTH_BL30_KEY_CERT, BL30_KEY_CERT_NAME,
	AUTH_BL30_IMG_CERT, BL30_CERT_NAME,
	mem_layout, load_addr);
	if (err) {
	ERROR("Failed to verify BL3-0 authenticity\n");
	return err;
	}
	#endif /* BL30_BASE */

	err = load_cert_bl3x(AUTH_BL31_KEY_CERT, BL31_KEY_CERT_NAME,
	AUTH_BL31_IMG_CERT, BL31_CERT_NAME,
	mem_layout, load_addr);
	if (err) {
	ERROR("Failed to verify BL3-1 authenticity\n");
	return err;
	}

	#ifdef BL32_BASE
	/* BL3-2 image is optional, but keep the return value in case the
	* image is present but the certificate is missing */
	err = load_cert_bl3x(AUTH_BL32_KEY_CERT, BL32_KEY_CERT_NAME,
	AUTH_BL32_IMG_CERT, BL32_CERT_NAME,
	mem_layout, load_addr);
	if (err) {
	WARN("Failed to verify BL3-2 authenticity\n");
	}
	bl32_cert_error = err;
	#endif /* BL32_BASE */

	err = load_cert_bl3x(AUTH_BL33_KEY_CERT, BL33_KEY_CERT_NAME,
	AUTH_BL33_IMG_CERT, BL33_CERT_NAME,
	mem_layout, load_addr);
	if (err) {
	ERROR("Failed to verify BL3-3 authenticity\n");
	return err;
	}

	return 0;
	}

	#endif /* TRUSTED_BOARD_BOOT */

	/*******************************************************************************
	* Load the BL3-0 image if there's one.
	* If a platform does not want to attempt to load BL3-0 image it must leave
	* BL30_BASE undefined.
	* Return 0 on success or if there's no BL3-0 image to load, a negative error
	* code otherwise.
	******************************************************************************/
	static int load_bl30(void)
	{
	int e = 0;
	#ifdef BL30_BASE
	meminfo_t bl30_mem_info;
	image_info_t bl30_image_info;

	/*
	* It is up to the platform to specify where BL3-0 should be loaded if
	* it exists. It could create space in the secure sram or point to a
	* completely different memory.
	*
	* The entry point information is not relevant in this case as the AP
	* won't execute the BL3-0 image.
	*/
	INFO("BL2: Loading BL3-0\n");
	bl2_plat_get_bl30_meminfo(&bl30_mem_info);
	bl30_image_info.h.version = VERSION_1;
	e = load_image(&bl30_mem_info,
	BL30_IMAGE_NAME,
	BL30_BASE,
	&bl30_image_info,
	NULL);

	if (e == 0) {
	#if TRUSTED_BOARD_BOOT
	e = auth_verify_obj(AUTH_BL30_IMG,
	bl30_image_info.image_base,
	bl30_image_info.image_size);
	if (e) {
	ERROR("Failed to authenticate BL3-0 image.\n");
	panic();
	}

	/* After working with data, invalidate the data cache */
	inv_dcache_range(bl30_image_info.image_base,
	(size_t)bl30_image_info.image_size);
	#endif /* TRUSTED_BOARD_BOOT */

	/* The subsequent handling of BL3-0 is platform specific */
	bl2_plat_handle_bl30(&bl30_image_info);
	}
	#endif /* BL30_BASE */

	return e;
	}

	/*******************************************************************************
	* Load the BL3-1 image.
	* The bl2_to_bl31_params and bl31_ep_info params will be updated with the
	* relevant BL3-1 information.
	* Return 0 on success, a negative error code otherwise.
	******************************************************************************/
	static int load_bl31(bl31_params_t *bl2_to_bl31_params,
	entry_point_info_t *bl31_ep_info)
	{
	meminfo_t *bl2_tzram_layout;
	int e;

	INFO("BL2: Loading BL3-1\n");
	assert(bl2_to_bl31_params != NULL);
	assert(bl31_ep_info != NULL);

	/* Find out how much free trusted ram remains after BL2 load */
	bl2_tzram_layout = bl2_plat_sec_mem_layout();

	/* Set the X0 parameter to BL3-1 */
	bl31_ep_info->args.arg0 = (unsigned long)bl2_to_bl31_params;

	/* Load the BL3-1 image */
	e = load_image(bl2_tzram_layout,
	BL31_IMAGE_NAME,
	BL31_BASE,
	bl2_to_bl31_params->bl31_image_info,
	bl31_ep_info);

	if (e == 0) {
	#if TRUSTED_BOARD_BOOT
	e = auth_verify_obj(AUTH_BL31_IMG,
	bl2_to_bl31_params->bl31_image_info->image_base,
	bl2_to_bl31_params->bl31_image_info->image_size);
	if (e) {
	ERROR("Failed to authenticate BL3-1 image.\n");
	panic();
	}

	/* After working with data, invalidate the data cache */
	inv_dcache_range(bl2_to_bl31_params->bl31_image_info->image_base,
	(size_t)bl2_to_bl31_params->bl31_image_info->image_size);
	#endif /* TRUSTED_BOARD_BOOT */

	bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info,
	bl31_ep_info);
	}

	return e;
	}

	/*******************************************************************************
	* Load the BL3-2 image if there's one.
	* The bl2_to_bl31_params param will be updated with the relevant BL3-2
	* information.
	* If a platform does not want to attempt to load BL3-2 image it must leave
	* BL32_BASE undefined.
	* Return 0 on success or if there's no BL3-2 image to load, a negative error
	* code otherwise.
	******************************************************************************/
	static int load_bl32(bl31_params_t *bl2_to_bl31_params)
	{
	int e = 0;
	#ifdef BL32_BASE
	meminfo_t bl32_mem_info;

	INFO("BL2: Loading BL3-2\n");
	assert(bl2_to_bl31_params != NULL);

	/*
	* It is up to the platform to specify where BL3-2 should be loaded if
	* it exists. It could create space in the secure sram or point to a
	* completely different memory.
	*/
	bl2_plat_get_bl32_meminfo(&bl32_mem_info);
	e = load_image(&bl32_mem_info,
	BL32_IMAGE_NAME,
	BL32_BASE,
	bl2_to_bl31_params->bl32_image_info,
	bl2_to_bl31_params->bl32_ep_info);

	if (e == 0) {
	#if TRUSTED_BOARD_BOOT
	/* Image is present. Check if there is a valid certificate */
	if (bl32_cert_error) {
	ERROR("Failed to authenticate BL3-2 certificates.\n");
	panic();
	}

	e = auth_verify_obj(AUTH_BL32_IMG,
	bl2_to_bl31_params->bl32_image_info->image_base,
	bl2_to_bl31_params->bl32_image_info->image_size);
	if (e) {
	ERROR("Failed to authenticate BL3-2 image.\n");
	panic();
	}
	/* After working with data, invalidate the data cache */
	inv_dcache_range(bl2_to_bl31_params->bl32_image_info->image_base,
	(size_t)bl2_to_bl31_params->bl32_image_info->image_size);
	#endif /* TRUSTED_BOARD_BOOT */

	bl2_plat_set_bl32_ep_info(
	bl2_to_bl31_params->bl32_image_info,
	bl2_to_bl31_params->bl32_ep_info);
	}
	#endif /* BL32_BASE */

	return e;
	}

	/*******************************************************************************
	* Load the BL3-3 image.
	* The bl2_to_bl31_params param will be updated with the relevant BL3-3
	* information.
	* Return 0 on success, a negative error code otherwise.
	******************************************************************************/
	static int load_bl33(bl31_params_t *bl2_to_bl31_params)
	{
	meminfo_t bl33_mem_info;
	int e;

	INFO("BL2: Loading BL3-3\n");
	assert(bl2_to_bl31_params != NULL);

	bl2_plat_get_bl33_meminfo(&bl33_mem_info);

	/* Load the BL3-3 image in non-secure memory provided by the platform */
	e = load_image(&bl33_mem_info,
	BL33_IMAGE_NAME,
	plat_get_ns_image_entrypoint(),
	bl2_to_bl31_params->bl33_image_info,
	bl2_to_bl31_params->bl33_ep_info);

	if (e == 0) {
	#if TRUSTED_BOARD_BOOT
	e = auth_verify_obj(AUTH_BL33_IMG,
	bl2_to_bl31_params->bl33_image_info->image_base,
	bl2_to_bl31_params->bl33_image_info->image_size);
	if (e) {
	ERROR("Failed to authenticate BL3-3 image.\n");
	panic();
	}
	/* After working with data, invalidate the data cache */
	inv_dcache_range(bl2_to_bl31_params->bl33_image_info->image_base,
	(size_t)bl2_to_bl31_params->bl33_image_info->image_size);
	#endif /* TRUSTED_BOARD_BOOT */

	bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info,
	bl2_to_bl31_params->bl33_ep_info);
	}

	return e;
	}

	/*******************************************************************************
	* The only thing to do in BL2 is to load further images and pass control to
	* BL3-1. The memory occupied by BL2 will be reclaimed by BL3-x stages. BL2 runs
	* entirely in S-EL1.
	******************************************************************************/
	void bl2_main(void)
	{
	bl31_params_t *bl2_to_bl31_params;
	entry_point_info_t *bl31_ep_info;
	int e;

	NOTICE("BL2: %s\n", version_string);
	NOTICE("BL2: %s\n", build_message);

	/* Perform remaining generic architectural setup in S-EL1 */
	bl2_arch_setup();

	#if TRUSTED_BOARD_BOOT
	/* Initialize authentication module */
	auth_init();

	/* Validate the certificates involved in the Chain of Trust */
	e = load_certs();
	if (e) {
	ERROR("Chain of Trust invalid. Aborting...\n");
	panic();
	}
	#endif /* TRUSTED_BOARD_BOOT */

	/*
	* Load the subsequent bootloader images
	*/
	e = load_bl30();
	if (e) {
	ERROR("Failed to load BL3-0 (%i)\n", e);
	panic();
	}

	/* Perform platform setup in BL2 after loading BL3-0 */
	bl2_platform_setup();

	/*
	* Get a pointer to the memory the platform has set aside to pass
	* information to BL3-1.
	*/
	bl2_to_bl31_params = bl2_plat_get_bl31_params();
	bl31_ep_info = bl2_plat_get_bl31_ep_info();

	e = load_bl31(bl2_to_bl31_params, bl31_ep_info);
	if (e) {
	ERROR("Failed to load BL3-1 (%i)\n", e);
	panic();
	}

	e = load_bl32(bl2_to_bl31_params);
	if (e)
	WARN("Failed to load BL3-2 (%i)\n", e);

	e = load_bl33(bl2_to_bl31_params);
	if (e) {
	ERROR("Failed to load BL3-3 (%i)\n", e);
	panic();
	}

	/* Flush the params to be passed to memory */
	bl2_plat_flush_bl31_params();

	/*
	* Run BL3-1 via an SMC to BL1. Information on how to pass control to
	* the BL3-2 (if present) and BL3-3 software images will be passed to
	* BL3-1 as an argument.
	*/
	smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0);
	}