plat/arm/common/arm_bl2_el3_setup.c

/*
 * Copyright (c) 2017-2024, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>

#include <drivers/generic_delay_timer.h>
#include <drivers/partition/partition.h>
#include <lib/fconf/fconf.h>
#include <lib/fconf/fconf_dyn_cfg_getter.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
#include <platform_def.h>

#pragma weak bl2_el3_early_platform_setup
#pragma weak bl2_el3_plat_arch_setup
#pragma weak bl2_el3_plat_prepare_exit

#define MAP_BL2_EL3_TOTAL	MAP_REGION_FLAT(				\
					bl2_el3_tzram_layout.total_base,	\
					bl2_el3_tzram_layout.total_size,	\
					MT_MEMORY | MT_RW | MT_SECURE)

static meminfo_t bl2_el3_tzram_layout;

/*
 * Perform arm specific early platform setup. At this moment we only initialize
 * the console and the memory layout.
 */
void arm_bl2_el3_early_platform_setup(void)
{
	/* Initialize the console to provide early debug support */
	arm_console_boot_init();

	/*
	 * Allow BL2 to see the whole Trusted RAM. This is determined
	 * statically since we cannot rely on BL1 passing this information
	 * in the RESET_TO_BL2 case.
	 */
	bl2_el3_tzram_layout.total_base = ARM_BL_RAM_BASE;
	bl2_el3_tzram_layout.total_size = ARM_BL_RAM_SIZE;

	/* Initialise the IO layer and register platform IO devices */
	plat_arm_io_setup();
}

void bl2_el3_early_platform_setup(u_register_t arg0 __unused,
				  u_register_t arg1 __unused,
				  u_register_t arg2 __unused,
				  u_register_t arg3 __unused)
{
	arm_bl2_el3_early_platform_setup();

	/*
	 * Initialize Interconnect for this cluster during cold boot.
	 * No need for locks as no other CPU is active.
	 */
	plat_arm_interconnect_init();
	/*
	 * Enable Interconnect coherency for the primary CPU's cluster.
	 */
	plat_arm_interconnect_enter_coherency();

	generic_delay_timer_init();
}

#if ARM_FW_CONFIG_LOAD_ENABLE
/*************************************************************************************
 * FW CONFIG load function for BL2 when RESET_TO_BL2=1 && ARM_FW_CONFIG_LOAD_ENABLE=1
 *************************************************************************************/
void arm_bl2_el3_plat_config_load(void)
{
	int ret;
	const struct dyn_cfg_dtb_info_t *fw_config_info;

	/* Set global DTB info for fixed fw_config information */
	set_config_info(PLAT_FW_CONFIG_BASE, ~0UL, PLAT_FW_CONFIG_MAX_SIZE, FW_CONFIG_ID);

	/* Fill the device tree information struct with the info from the config dtb */
	ret = fconf_load_config(FW_CONFIG_ID);
	if (ret < 0) {
		ERROR("Loading of FW_CONFIG failed %d\n", ret);
		plat_error_handler(ret);
	}

	/*
	 * FW_CONFIG loaded successfully. Check the FW_CONFIG device tree parsing
	 * is successful.
	 */
	fw_config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, FW_CONFIG_ID);
	if (fw_config_info == NULL) {
		ret = -1;
		ERROR("Invalid FW_CONFIG address\n");
		plat_error_handler(ret);
	}
	ret = fconf_populate_dtb_registry(fw_config_info->config_addr);
	if (ret < 0) {
		ERROR("Parsing of FW_CONFIG failed %d\n", ret);
		plat_error_handler(ret);
	}
}
#endif /* ARM_FW_CONFIG_LOAD_ENABLE */

/*******************************************************************************
 * Perform the very early platform specific architectural setup here. At the
 * moment this is only initializes the mmu in a quick and dirty way.
 ******************************************************************************/
void arm_bl2_el3_plat_arch_setup(void)
{

#if USE_COHERENT_MEM
	/* Ensure ARM platforms dont use coherent memory
	 * in RESET_TO_BL2
	 */
	assert(BL_COHERENT_RAM_END - BL_COHERENT_RAM_BASE == 0U);
#endif

	const mmap_region_t bl_regions[] = {
		MAP_BL2_EL3_TOTAL,
		ARM_MAP_BL_RO,
		{0}
	};

	setup_page_tables(bl_regions, plat_arm_get_mmap());

#ifdef __aarch64__
	enable_mmu_el3(0);
#else
	enable_mmu_svc_mon(0);
#endif
}

void bl2_el3_plat_arch_setup(void)
{
	int __maybe_unused ret;
	arm_bl2_el3_plat_arch_setup();
#if ARM_GPT_SUPPORT
	ret = gpt_partition_init();
	if (ret != 0) {
		ERROR("GPT partition initialisation failed!\n");
		panic();
	}
#endif /* ARM_GPT_SUPPORT */
}

void bl2_el3_plat_prepare_exit(void)
{
}