plat/arm/common/arm_bl31_setup.c

/*
 * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <arch_helpers.h>
#include <arm_def.h>
#include <assert.h>
#include <bl_common.h>
#include <console.h>
#include <debug.h>
#include <mmio.h>
#include <plat_arm.h>
#include <platform.h>

#define BL31_END (uintptr_t)(&__BL31_END__)

/*
 * Placeholder variables for copying the arguments that have been passed to
 * BL31 from BL2.
 */
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;


/* Weak definitions may be overridden in specific ARM standard platform */
#pragma weak bl31_early_platform_setup2
#pragma weak bl31_platform_setup
#pragma weak bl31_plat_arch_setup
#pragma weak bl31_plat_get_next_image_ep_info


/*******************************************************************************
 * Return a pointer to the 'entry_point_info' structure of the next image for the
 * security state specified. BL33 corresponds to the non-secure image type
 * while BL32 corresponds to the secure image type. A NULL pointer is returned
 * if the image does not exist.
 ******************************************************************************/
entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
{
	entry_point_info_t *next_image_info;

	assert(sec_state_is_valid(type));
	next_image_info = (type == NON_SECURE)
			? &bl33_image_ep_info : &bl32_image_ep_info;
	/*
	 * None of the images on the ARM development platforms can have 0x0
	 * as the entrypoint
	 */
	if (next_image_info->pc)
		return next_image_info;
	else
		return NULL;
}

/*******************************************************************************
 * Perform any BL31 early platform setup common to ARM standard platforms.
 * Here is an opportunity to copy parameters passed by the calling EL (S-EL1
 * in BL2 & S-EL3 in BL1) before they are lost (potentially). This needs to be
 * done before the MMU is initialized so that the memory layout can be used
 * while creating page tables. BL2 has flushed this information to memory, so
 * we are guaranteed to pick up good data.
 ******************************************************************************/
#if LOAD_IMAGE_V2
void arm_bl31_early_platform_setup(void *from_bl2, uintptr_t soc_fw_config,
				uintptr_t hw_config, void *plat_params_from_bl2)
#else
void arm_bl31_early_platform_setup(bl31_params_t *from_bl2, uintptr_t soc_fw_config,
				uintptr_t hw_config, void *plat_params_from_bl2)
#endif
{
	/* Initialize the console to provide early debug support */
	console_init(PLAT_ARM_BOOT_UART_BASE, PLAT_ARM_BOOT_UART_CLK_IN_HZ,
			ARM_CONSOLE_BAUDRATE);

#if RESET_TO_BL31
	/* There are no parameters from BL2 if BL31 is a reset vector */
	assert(from_bl2 == NULL);
	assert(plat_params_from_bl2 == NULL);

# ifdef BL32_BASE
	/* Populate entry point information for BL32 */
	SET_PARAM_HEAD(&bl32_image_ep_info,
				PARAM_EP,
				VERSION_1,
				0);
	SET_SECURITY_STATE(bl32_image_ep_info.h.attr, SECURE);
	bl32_image_ep_info.pc = BL32_BASE;
	bl32_image_ep_info.spsr = arm_get_spsr_for_bl32_entry();
# endif /* BL32_BASE */

	/* Populate entry point information for BL33 */
	SET_PARAM_HEAD(&bl33_image_ep_info,
				PARAM_EP,
				VERSION_1,
				0);
	/*
	 * Tell BL31 where the non-trusted software image
	 * is located and the entry state information
	 */
	bl33_image_ep_info.pc = plat_get_ns_image_entrypoint();

	bl33_image_ep_info.spsr = arm_get_spsr_for_bl33_entry();
	SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE);

# if ARM_LINUX_KERNEL_AS_BL33
	/*
	 * According to the file ``Documentation/arm64/booting.txt`` of the
	 * Linux kernel tree, Linux expects the physical address of the device
	 * tree blob (DTB) in x0, while x1-x3 are reserved for future use and
	 * must be 0.
	 */
	bl33_image_ep_info.args.arg0 = (u_register_t)ARM_PRELOADED_DTB_BASE;
	bl33_image_ep_info.args.arg1 = 0U;
	bl33_image_ep_info.args.arg2 = 0U;
	bl33_image_ep_info.args.arg3 = 0U;
# endif

#else /* RESET_TO_BL31 */

	/*
	 * In debug builds, we pass a special value in 'plat_params_from_bl2'
	 * to verify platform parameters from BL2 to BL31.
	 * In release builds, it's not used.
	 */
	assert(((unsigned long long)plat_params_from_bl2) ==
		ARM_BL31_PLAT_PARAM_VAL);

# if LOAD_IMAGE_V2
	/*
	 * Check params passed from BL2 should not be NULL,
	 */
	bl_params_t *params_from_bl2 = (bl_params_t *)from_bl2;
	assert(params_from_bl2 != NULL);
	assert(params_from_bl2->h.type == PARAM_BL_PARAMS);
	assert(params_from_bl2->h.version >= VERSION_2);

	bl_params_node_t *bl_params = params_from_bl2->head;

	/*
	 * Copy BL33 and BL32 (if present), entry point information.
	 * They are stored in Secure RAM, in BL2's address space.
	 */
	while (bl_params) {
		if (bl_params->image_id == BL32_IMAGE_ID)
			bl32_image_ep_info = *bl_params->ep_info;

		if (bl_params->image_id == BL33_IMAGE_ID)
			bl33_image_ep_info = *bl_params->ep_info;

		bl_params = bl_params->next_params_info;
	}

	if (bl33_image_ep_info.pc == 0)
		panic();

# else /* LOAD_IMAGE_V2 */

	/*
	 * Check params passed from BL2 should not be NULL,
	 */
	assert(from_bl2 != NULL);
	assert(from_bl2->h.type == PARAM_BL31);
	assert(from_bl2->h.version >= VERSION_1);

	/* Dynamic Config is not supported for LOAD_IMAGE_V1 */
	assert(soc_fw_config == 0);
	assert(hw_config == 0);

	/*
	 * Copy BL32 (if populated by BL2) and BL33 entry point information.
	 * They are stored in Secure RAM, in BL2's address space.
	 */
	if (from_bl2->bl32_ep_info)
		bl32_image_ep_info = *from_bl2->bl32_ep_info;
	bl33_image_ep_info = *from_bl2->bl33_ep_info;

# endif /* LOAD_IMAGE_V2 */
#endif /* RESET_TO_BL31 */
}

void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
		u_register_t arg2, u_register_t arg3)
{
	arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);

	/*
	 * 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.
	 * Earlier bootloader stages might already do this (e.g. Trusted
	 * Firmware's BL1 does it) but we can't assume so. There is no harm in
	 * executing this code twice anyway.
	 * Platform specific PSCI code will enable coherency for other
	 * clusters.
	 */
	plat_arm_interconnect_enter_coherency();
}

/*******************************************************************************
 * Perform any BL31 platform setup common to ARM standard platforms
 ******************************************************************************/
void arm_bl31_platform_setup(void)
{
	/* Initialize the GIC driver, cpu and distributor interfaces */
	plat_arm_gic_driver_init();
	plat_arm_gic_init();

#if RESET_TO_BL31
	/*
	 * Do initial security configuration to allow DRAM/device access
	 * (if earlier BL has not already done so).
	 */
	plat_arm_security_setup();

#if defined(PLAT_ARM_MEM_PROT_ADDR)
	arm_nor_psci_do_dyn_mem_protect();
#endif /* PLAT_ARM_MEM_PROT_ADDR */

#endif /* RESET_TO_BL31 */

	/* Enable and initialize the System level generic timer */
	mmio_write_32(ARM_SYS_CNTCTL_BASE + CNTCR_OFF,
			CNTCR_FCREQ(0) | CNTCR_EN);

	/* Allow access to the System counter timer module */
	arm_configure_sys_timer();

	/* Initialize power controller before setting up topology */
	plat_arm_pwrc_setup();
}

/*******************************************************************************
 * Perform any BL31 platform runtime setup prior to BL31 exit common to ARM
 * standard platforms
 ******************************************************************************/
void arm_bl31_plat_runtime_setup(void)
{
	/* Initialize the runtime console */
	console_init(PLAT_ARM_BL31_RUN_UART_BASE, PLAT_ARM_BL31_RUN_UART_CLK_IN_HZ,
			ARM_CONSOLE_BAUDRATE);
}

void bl31_platform_setup(void)
{
	arm_bl31_platform_setup();
}

void bl31_plat_runtime_setup(void)
{
	arm_bl31_plat_runtime_setup();
}

/*******************************************************************************
 * Perform the very early platform specific architectural setup shared between
 * ARM standard platforms. This only does basic initialization. Later
 * architectural setup (bl31_arch_setup()) does not do anything platform
 * specific.
 ******************************************************************************/
void arm_bl31_plat_arch_setup(void)
{
	arm_setup_page_tables(BL31_BASE,
			      BL31_END - BL31_BASE,
			      BL_CODE_BASE,
			      BL_CODE_END,
			      BL_RO_DATA_BASE,
			      BL_RO_DATA_END
#if USE_COHERENT_MEM
			      , BL_COHERENT_RAM_BASE,
			      BL_COHERENT_RAM_END
#endif
			      );
	enable_mmu_el3(0);
}

void bl31_plat_arch_setup(void)
{
	arm_bl31_plat_arch_setup();
}