1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2022 MediaTek Inc.
4 * Author: Sam Shih <sam.shih@mediatek.com>
5 */
6
7/*
8 * Switch from AArch64 EL2 to AArch32 EL2
9 * @param inputs:
10 * x0: argument, zero
11 * x1: machine nr
12 * x2: fdt address
13 * x3: input argument
14 * x4: kernel entry point
15 * @param outputs for secure firmware:
16 * x0: function id
17 * x1: kernel entry point
18 * x2: machine nr
19 * x3: fdt address
20 *
21 * [1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/mediatek/common/mtk_sip_svc.c
22*/
23
24.global armv8_el2_to_aarch32
25armv8_el2_to_aarch32:
26	mov	x3, x2
27	mov	x2, x1
28	mov	x1, x4
29	mov	x4, #0
30	ldr	x0, =0x82000200	/* MTK_SIP_KERNEL_BOOT_AARCH32 */
31	SMC	#0
32	ret
33