arm_bl1_setup.c

/*
 * Copyright (c) 2015-2016, 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 <arm_def.h>
#include <bl_common.h>
#include <console.h>
#include <platform_def.h>
#include <plat_arm.h>
#include <sp805.h>
#include "../../../bl1/bl1_private.h"


#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 BL1_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
#define BL1_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
#endif


/* Weak definitions may be overridden in specific ARM standard platform */
#pragma weak bl1_early_platform_setup
#pragma weak bl1_plat_arch_setup
#pragma weak bl1_platform_setup
#pragma weak bl1_plat_sec_mem_layout


/* Data structure which holds the extents of the trusted SRAM for BL1*/
static meminfo_t bl1_tzram_layout;

meminfo_t *bl1_plat_sec_mem_layout(void)
{
	return &bl1_tzram_layout;
}

/*******************************************************************************
 * BL1 specific platform actions shared between ARM standard platforms.
 ******************************************************************************/
void arm_bl1_early_platform_setup(void)
{
	const size_t bl1_size = BL1_RAM_LIMIT - BL1_RAM_BASE;

#if !ARM_DISABLE_TRUSTED_WDOG
	/* Enable watchdog */
	sp805_start(ARM_SP805_TWDG_BASE, ARM_TWDG_LOAD_VAL);
#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);

	/* Allow BL1 to see the whole Trusted RAM */
	bl1_tzram_layout.total_base = ARM_BL_RAM_BASE;
	bl1_tzram_layout.total_size = ARM_BL_RAM_SIZE;

	/* Calculate how much RAM BL1 is using and how much remains free */
	bl1_tzram_layout.free_base = ARM_BL_RAM_BASE;
	bl1_tzram_layout.free_size = ARM_BL_RAM_SIZE;
	reserve_mem(&bl1_tzram_layout.free_base,
		    &bl1_tzram_layout.free_size,
		    BL1_RAM_BASE,
		    bl1_size);
}

void bl1_early_platform_setup(void)
{
	arm_bl1_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();
}

/******************************************************************************
 * Perform the very early platform specific architecture setup shared between
 * ARM standard platforms. This only does basic initialization. Later
 * architectural setup (bl1_arch_setup()) does not do anything platform
 * specific.
 *****************************************************************************/
void arm_bl1_plat_arch_setup(void)
{
	arm_setup_page_tables(bl1_tzram_layout.total_base,
			      bl1_tzram_layout.total_size,
			      BL1_RO_BASE,
			      BL1_RO_LIMIT
#if USE_COHERENT_MEM
			      , BL1_COHERENT_RAM_BASE,
			      BL1_COHERENT_RAM_LIMIT
#endif
			     );
	enable_mmu_el3(0);
}

void bl1_plat_arch_setup(void)
{
	arm_bl1_plat_arch_setup();
}

/*
 * Perform the platform specific architecture setup shared between
 * ARM standard platforms.
 */
void arm_bl1_platform_setup(void)
{
	/* Initialise the IO layer and register platform IO devices */
	plat_arm_io_setup();
}

void bl1_platform_setup(void)
{
	arm_bl1_platform_setup();
}

void bl1_plat_prepare_exit(entry_point_info_t *ep_info)
{
#if !ARM_DISABLE_TRUSTED_WDOG
	/* Disable watchdog before leaving BL1 */
	sp805_stop(ARM_SP805_TWDG_BASE);
#endif

#ifdef EL3_PAYLOAD_BASE
	/*
	 * Program the EL3 payload's entry point address into the CPUs mailbox
	 * in order to release secondary CPUs from their holding pen and make
	 * them jump there.
	 */
	arm_program_trusted_mailbox(ep_info->pc);
	dsbsy();
	sev();
#endif
}