/*
 * Copyright (C) 2020 Intel Corporation. All rights reserved
 *
 * SPDX-License-Identifier:    GPL-2.0
 */

#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>

ENTRY(lowlevel_init)
	mov	x29, lr			/* Save LR */

#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)
wait_for_atf:
	ldr	x4, =CPU_RELEASE_ADDR
	ldr	x5, [x4]
	cbz	x5, slave_wait_atf
	br	x5
slave_wait_atf:
	branch_if_slave x0, wait_for_atf
#else
	branch_if_slave x0, 1f
#endif
	ldr	x0, =GICD_BASE
	bl	gic_init_secure
1:
#if defined(CONFIG_GICV3)
	ldr	x0, =GICR_BASE
	bl	gic_init_secure_percpu
#elif defined(CONFIG_GICV2)
	ldr	x0, =GICD_BASE
	ldr	x1, =GICC_BASE
	bl	gic_init_secure_percpu
#endif
#endif

#ifdef CONFIG_ARMV8_MULTIENTRY
	branch_if_master x0, x1, 2f

	/*
	 * Slave should wait for master clearing spin table.
	 * This sync prevent slaves observing incorrect
	 * value of spin table and jumping to wrong place.
	 */
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
#ifdef CONFIG_GICV2
	ldr	x0, =GICC_BASE
#endif
	bl	gic_wait_for_interrupt
#endif

	/*
	 * All slaves will enter EL2 and optionally EL1.
	 */
	adr	x4, lowlevel_in_el2
	ldr	x5, =ES_TO_AARCH64
	bl	armv8_switch_to_el2

lowlevel_in_el2:
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
	adr	x4, lowlevel_in_el1
	ldr	x5, =ES_TO_AARCH64
	bl	armv8_switch_to_el1

lowlevel_in_el1:
#endif

#endif /* CONFIG_ARMV8_MULTIENTRY */

2:
	mov	lr, x29			/* Restore LR */
	ret
ENDPROC(lowlevel_init)