1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2019 MediaTek Inc.
4 * Author: Mingming Lee <mingming.lee@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.global armv8_el2_to_aarch32
22armv8_el2_to_aarch32:
23	mov     x3, x2
24	mov     x2, x1
25	mov     x1, x4
26	mov	x4, #0
27	/* Define in src\bsp\trustzone\atf\v1.2\ */
28	/* mt8xxx\plat\mediatek\common\sip_svc.h */
29	/* MTK_SIP_KERNEL_BOOT_AARCH64 for U-BOOT-64 to KERNEL*/
30	ldr x0, =0xC2000200
31	SMC #0
32	ret
33