arm_bl31_setup.c

/*
 * Copyright (c) 2015, 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 <arm_def.h>
#include <assert.h>
#include <bl_common.h>
#include <cci.h>
#include <console.h>
#include <debug.h>
#include <mmio.h>
#include <plat_arm.h>
#include <platform.h>


/*
 * The next 3 constants identify the extents of the code, RO data region and the
 * limit of the BL31 image.  These addresses are used by the MMU setup code and
 * therefore they must be page-aligned.  It is the responsibility of the linker
 * script to ensure that __RO_START__, __RO_END__ & __BL31_END__ linker symbols
 * refer to page-aligned addresses.
 */
#define BL31_RO_BASE (unsigned long)(&__RO_START__)
#define BL31_RO_LIMIT (unsigned long)(&__RO_END__)
#define BL31_END (unsigned long)(&__BL31_END__)

#if USE_COHERENT_MEM
/*
 * The next 2 constants identify the extents of the coherent memory region.
 * These addresses are used by the MMU setup code and therefore they must be
 * page-aligned.  It is the responsibility of the linker script to ensure that
 * __COHERENT_RAM_START__ and __COHERENT_RAM_END__ linker symbols
 * refer to page-aligned addresses.
 */
#define BL31_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
#define BL31_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
#endif

/*
 * 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_setup
#pragma weak bl31_platform_setup
#pragma weak bl31_plat_arch_setup
#pragma weak bl31_plat_get_next_image_ep_info
#pragma weak plat_get_syscnt_freq


/*******************************************************************************
 * 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.
 ******************************************************************************/
void arm_bl31_early_platform_setup(bl31_params_t *from_bl2,
				void *plat_params_from_bl2)
{
	/* 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);

#else
	/*
	 * 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);
	/*
	 * 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);

	/*
	 * 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
}

void bl31_early_platform_setup(bl31_params_t *from_bl2,
				void *plat_params_from_bl2)
{
	arm_bl31_early_platform_setup(from_bl2, plat_params_from_bl2);

	/*
	 * Initialize CCI for this cluster during cold boot.
	 * No need for locks as no other CPU is active.
	 */
	arm_cci_init();

	/*
	 * Enable CCI 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.
	 */
	cci_enable_snoop_dvm_reqs(MPIDR_AFFLVL1_VAL(read_mpidr()));
}

/*******************************************************************************
 * 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();

#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 here. At the
 * moment this is only intializes the mmu in a quick and dirty way.
 ******************************************************************************/
void arm_bl31_plat_arch_setup(void)
{
	arm_configure_mmu_el3(BL31_RO_BASE,
			      (BL31_END - BL31_RO_BASE),
			      BL31_RO_BASE,
			      BL31_RO_LIMIT
#if USE_COHERENT_MEM
			      , BL31_COHERENT_RAM_BASE,
			      BL31_COHERENT_RAM_LIMIT
#endif
			      );
}

void bl31_plat_arch_setup(void)
{
	arm_bl31_plat_arch_setup();
}

uint64_t plat_get_syscnt_freq(void)
{
	uint64_t counter_base_frequency;

	/* Read the frequency from Frequency modes table */
	counter_base_frequency = mmio_read_32(ARM_SYS_CNTCTL_BASE + CNTFID_OFF);

	/* The first entry of the frequency modes table must not be 0 */
	if (counter_base_frequency == 0)
		panic();

	return counter_base_frequency;
}