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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 <arch.h>
.globl bl2_entrypoint
.section .text, "ax"; .align 3
bl2_entrypoint:; .type bl2_entrypoint, %function
/*---------------------------------------------
* Store the extents of the tzram available to
* BL2 for future use. Use the opcode param to
* allow implement other functions if needed.
* ---------------------------------------------
*/
mov x20, x0
mov x21, x1
mov x22, x2
/* ---------------------------------------------
* This is BL2 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
/* ---------------------------------------------
* Set the exception vector to something sane.
* ---------------------------------------------
*/
adr x0, early_exceptions
msr vbar_el1, x0
/* ---------------------------------------------
* Enable the instruction cache.
* ---------------------------------------------
*/
mrs x0, sctlr_el1
orr x0, x0, #SCTLR_I_BIT
msr sctlr_el1, x0
isb
/* ---------------------------------------------
* Check the opcodes out of paranoia.
* ---------------------------------------------
*/
mov x0, #RUN_IMAGE
cmp x0, x20
b.ne _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 early platform setup & platform
* specific early arch. setup e.g. mmu setup
* ---------------------------------------------
*/
mov x0, x21
mov x1, x22
bl bl2_early_platform_setup
bl bl2_plat_arch_setup
/* ---------------------------------------------
* Give ourselves a stack allocated in Normal
* -IS-WBWA memory
* ---------------------------------------------
*/
mov x0, x19
bl platform_set_stack
/* ---------------------------------------------
* Jump to main function.
* ---------------------------------------------
*/
bl bl2_main
_panic:
b _panic