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path: root/fwu/ns_bl2u/aarch32/ns_bl2u_entrypoint.S
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/*
 * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <tftf.h>

	.globl	ns_bl2u_entrypoint

func ns_bl2u_entrypoint
	/* ---------------------------------------------------------------------
	 * Set the exception vectors.
	 * ---------------------------------------------------------------------
	 */
	ldr	r0, =exception_stubs
	stcopr	r0, HVBAR

	/* ---------------------------------------------------------------------
	 * Enable the instruction cache and alignment checks.
	 * ---------------------------------------------------------------------
	 */
	ldcopr	r0, HSCTLR
	ldr	r1, =(HSCTLR_I_BIT | HSCTLR_A_BIT)
	orr	r0, r0, r1
	stcopr	r0, HSCTLR
	isb

	/* ---------------------------------------------------------------------
	 * Zero-initialise the .bss section.
	 * ---------------------------------------------------------------------
	 */
	ldr	r0, =__BSS_START__
	ldr	r1, =__BSS_SIZE__
	bl	zeromem

	/* ---------------------------------------------------------------------
	 * Allocate a stack whose memory will be marked as Normal
	 * Inner-Shareable, Write-Back, Write-Allocate memory when the MMU is
	 * enabled.
	 * There is no risk of reading stale stack memory after enabling the MMU
	 * as only the primary CPU is running at the moment.
	 * ---------------------------------------------------------------------
	 */
	ldcopr	r0, MPIDR
	bl	platform_set_stack

	/* ---------------------------------------------------------------------
	 * Perform early platform setup.
	 * TODO: Investigate why tftf_plat_arch_setup() is not needed on
	 * AArch32, whereas it is on AArch64.
	 * ---------------------------------------------------------------------
	 */
	bl	tftf_early_platform_setup

	/* ---------------------------------------------------------------------
	 * Jump to main function.
	 * ---------------------------------------------------------------------
	 */
	bl	ns_bl2u_main
dead:
	b	dead
endfunc ns_bl2u_entrypoint