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/*
* Copyright (c) 2013, 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 <bl_common.h>
#include <platform.h>
#include <arch.h>
.globl bl31_entrypoint
.section .text, "ax"; .align 3
/* -----------------------------------------------------
* bl31_entrypoint() is the cold boot entrypoint,
* executed only by the primary cpu.
* -----------------------------------------------------
*/
bl31_entrypoint:; .type bl31_entrypoint, %function
/* ---------------------------------------------
* BL2 has populated x0,x3,x4 with the opcode
* indicating BL31 should be run, memory layout
* of the trusted SRAM available to BL31 and
* information about running the non-trusted
* software already loaded by BL2.
* ---------------------------------------------
*/
/* ---------------------------------------------
* Set the exception vector to something sane.
* ---------------------------------------------
*/
adr x1, runtime_exceptions
msr vbar_el3, x1
/* ---------------------------------------------
* Enable the instruction cache.
* ---------------------------------------------
*/
mrs x1, sctlr_el3
orr x1, x1, #SCTLR_I_BIT
msr sctlr_el3, x1
isb
/* ---------------------------------------------
* Check the opcodes out of paranoia.
* ---------------------------------------------
*/
mov x19, #RUN_IMAGE
cmp x0, x19
b.ne _panic
mov x20, x3
mov x21, x4
/* ---------------------------------------------
* This is BL31 which is expected to be executed
* only by the primary cpu (at least for now).
* So, make sure no secondary has lost its way.
* ---------------------------------------------
*/
bl read_mpidr
mov x19, x0
bl platform_is_primary_cpu
cbz x0, _panic
/* ---------------------------------------------
* Zero out NOBITS sections. There are 2 of them:
* - the .bss section;
* - the coherent memory section.
* ---------------------------------------------
*/
ldr x0, =__BSS_START__
ldr x1, =__BSS_SIZE__
bl zeromem16
ldr x0, =__COHERENT_RAM_START__
ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__
bl zeromem16
/* --------------------------------------------
* Give ourselves a small coherent stack to
* ease the pain of initializing the MMU
* --------------------------------------------
*/
mov x0, x19
bl platform_set_coherent_stack
/* ---------------------------------------------
* Perform platform specific early arch. setup
* ---------------------------------------------
*/
mov x0, x20
mov x1, x21
mov x2, x19
bl bl31_early_platform_setup
bl bl31_plat_arch_setup
/* ---------------------------------------------
* Give ourselves a stack allocated in Normal
* -IS-WBWA memory
* ---------------------------------------------
*/
mov x0, x19
bl platform_set_stack
/* ---------------------------------------------
* Use SP_EL0 to initialize BL31. It allows us
* to jump to the next image without having to
* come back here to ensure all of the stack's
* been popped out. run_image() is not nice
* enough to reset the stack pointer before
* handing control to the next stage.
* ---------------------------------------------
*/
mov x0, sp
msr sp_el0, x0
msr spsel, #0
isb
/* ---------------------------------------------
* Jump to main function.
* ---------------------------------------------
*/
bl bl31_main
_panic:
b _panic
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