u-boot/arch/arm/cpu/armv8/transition.S

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ArmAsm
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/*
* (C) Copyright 2013
* David Feng <fenghua@phytium.com.cn>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <version.h>
#include <linux/linkage.h>
#include <asm/macro.h>
ENTRY(armv8_switch_to_el2)
switch_el x0, 1f, 0f, 0f
0: ret
1: armv8_switch_to_el2_m x0
ENDPROC(armv8_switch_to_el2)
ENTRY(armv8_switch_to_el1)
switch_el x0, 0f, 1f, 0f
0: ret
1: armv8_switch_to_el1_m x0, x1
ENDPROC(armv8_switch_to_el1)