blob: 9d2dc299559d69cf778f411a68914994497a386b [file] [log] [blame]
/*
* 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 <stdio.h>
#include <string.h>
#include <assert.h>
#include <arch_helpers.h>
#include <console.h>
#include <platform.h>
#include <semihosting.h>
#include <bl_common.h>
#include <bl31.h>
#include <runtime_svc.h>
#include <context_mgmt.h>
/*******************************************************************************
* Simple function to initialise all BL31 helper libraries.
******************************************************************************/
void bl31_lib_init()
{
cm_init();
}
/*******************************************************************************
* BL31 is responsible for setting up the runtime services for the primary cpu
* before passing control to the bootloader (UEFI) or Linux. This function calls
* runtime_svc_init() which initializes all registered runtime services. The run
* time services would setup enough context for the core to swtich to the next
* exception level. When this function returns, the core will switch to the
* programmed exception level via. an ERET.
******************************************************************************/
void bl31_main(void)
{
el_change_info *next_image_info;
uint32_t scr;
/* Perform remaining generic architectural setup from EL3 */
bl31_arch_setup();
/* Perform platform setup in BL1 */
bl31_platform_setup();
#if defined (__GNUC__)
printf("BL31 Built : %s, %s\n\r", __TIME__, __DATE__);
#endif
/* Initialise helper libraries */
bl31_lib_init();
/* Initialize the runtime services e.g. psci */
runtime_svc_init();
/* Clean caches before re-entering normal world */
dcsw_op_all(DCCSW);
/*
* Setup minimal architectural state of the next highest EL to
* allow execution in it immediately upon entering it.
*/
bl31_arch_next_el_setup();
/* Program EL3 registers to enable entry into the next EL */
next_image_info = bl31_get_next_image_info();
scr = read_scr();
if (next_image_info->security_state == NON_SECURE)
scr |= SCR_NS_BIT;
/*
* Tell the context mgmt. library to ensure that SP_EL3 points to
* the right context to exit from EL3 correctly.
*/
cm_set_el3_eret_context(next_image_info->security_state,
next_image_info->entrypoint,
next_image_info->spsr,
scr);
/* Finally set the next context */
cm_set_next_eret_context(next_image_info->security_state);
}