135 lines
4.1 KiB
ArmAsm
135 lines
4.1 KiB
ArmAsm
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bl_common.h>
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#include <arch.h>
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.globl bl2_entrypoint
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.section .text, "ax"; .align 3
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bl2_entrypoint:; .type bl2_entrypoint, %function
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/*---------------------------------------------
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* Store the extents of the tzram available to
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* BL2 for future use. Use the opcode param to
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* allow implement other functions if needed.
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* ---------------------------------------------
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*/
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mov x20, x0
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mov x21, x1
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mov x22, x2
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/* ---------------------------------------------
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* This is BL2 which is expected to be executed
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* only by the primary cpu (at least for now).
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* So, make sure no secondary has lost its way.
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* ---------------------------------------------
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*/
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bl read_mpidr
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mov x19, x0
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bl platform_is_primary_cpu
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cbz x0, _panic
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/* ---------------------------------------------
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* Set the exception vector to something sane.
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* ---------------------------------------------
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*/
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adr x0, early_exceptions
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msr vbar_el1, x0
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/* ---------------------------------------------
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* Enable the instruction cache.
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* ---------------------------------------------
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*/
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mrs x0, sctlr_el1
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orr x0, x0, #SCTLR_I_BIT
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msr sctlr_el1, x0
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isb
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/* ---------------------------------------------
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* Check the opcodes out of paranoia.
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* ---------------------------------------------
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*/
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mov x0, #RUN_IMAGE
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cmp x0, x20
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b.ne _panic
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/* ---------------------------------------------
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* Zero out NOBITS sections. There are 2 of them:
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* - the .bss section;
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* - the coherent memory section.
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* ---------------------------------------------
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*/
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ldr x0, =__BSS_START__
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ldr x1, =__BSS_SIZE__
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bl zeromem16
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ldr x0, =__COHERENT_RAM_START__
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ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__
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bl zeromem16
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/* --------------------------------------------
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* Give ourselves a small coherent stack to
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* ease the pain of initializing the MMU
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* --------------------------------------------
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*/
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mov x0, x19
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bl platform_set_coherent_stack
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/* ---------------------------------------------
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* Perform early platform setup & platform
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* specific early arch. setup e.g. mmu setup
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* ---------------------------------------------
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*/
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mov x0, x21
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mov x1, x22
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bl bl2_early_platform_setup
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bl bl2_plat_arch_setup
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/* ---------------------------------------------
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* Give ourselves a stack allocated in Normal
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* -IS-WBWA memory
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* ---------------------------------------------
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*/
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mov x0, x19
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bl platform_set_stack
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/* ---------------------------------------------
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* Jump to main function.
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* ---------------------------------------------
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*/
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bl bl2_main
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_panic:
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b _panic
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