bl31_plat_setup.c

/*
 * 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 <platform.h>
#include <assert.h>
#include <arch_helpers.h>

/*******************************************************************************
 * Declarations of linker defined symbols which will help us find the layout
 * of trusted RAM
 ******************************************************************************/
extern unsigned long __RO_START__;
extern unsigned long __RO_END__;

extern unsigned long __COHERENT_RAM_START__;
extern unsigned long __COHERENT_RAM_END__;

/*
 * The next 2 constants identify the extents of the code & RO data 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
 * __RO_START__ and __RO_END__ linker symbols refer to page-aligned addresses.
 */
#define BL31_RO_BASE (unsigned long)(&__RO_START__)
#define BL31_RO_LIMIT (unsigned long)(&__RO_END__)

/*
 * 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__)

static bl31_args bl2_to_bl31_args;

meminfo *bl31_plat_sec_mem_layout(void)
{
	return &bl2_to_bl31_args.bl31_meminfo;
}

meminfo *bl31_plat_get_bl32_mem_layout(void)
{
	return &bl2_to_bl31_args.bl32_meminfo;
}

/*******************************************************************************
 * Return a pointer to the 'el_change_info' structure of the next image for the
 * security state specified. BL3-3 corresponds to the non-secure image type
 * while BL3-2 corresponds to the secure image type. A NULL pointer is returned
 * if the image does not exist.
 ******************************************************************************/
el_change_info *bl31_get_next_image_info(uint32_t type)
{
	el_change_info *next_image_info;

	next_image_info = (type == NON_SECURE) ?
		&bl2_to_bl31_args.bl33_image_info :
		&bl2_to_bl31_args.bl32_image_info;

	/* None of the images on this platform can have 0x0 as the entrypoint */
	if (next_image_info->entrypoint)
		return next_image_info;
	else
		return NULL;
}

/*******************************************************************************
 * Perform any BL3-1 specific platform actions. 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. The 'data'
 * parameter is not used since all the information is contained in 'from_bl2'.
 * Also, BL2 has flushed this information to memory, so we are guaranteed to
 * pick up good data
 ******************************************************************************/
void bl31_early_platform_setup(bl31_args *from_bl2,
			       void *data)
{
	bl2_to_bl31_args = *from_bl2;
}

/*******************************************************************************
 * Initialize the MHU and the GIC.
 ******************************************************************************/
void bl31_platform_setup(void)
{
	unsigned int counter_base_frequency;
	/* Initialize the gic cpu and distributor interfaces */
	gic_setup();

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

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

	/* Program the counter frequency */
	write_cntfrq_el0(counter_base_frequency);

	/* Topologies are best known to the platform. */
	plat_setup_topology();
}

/*******************************************************************************
 * 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 bl31_plat_arch_setup()
{
	configure_mmu(&bl2_to_bl31_args.bl31_meminfo,
		      BL31_RO_BASE,
		      BL31_RO_LIMIT,
		      BL31_COHERENT_RAM_BASE,
		      BL31_COHERENT_RAM_LIMIT);
}