xref: /openbmc/u-boot/arch/arm/cpu/armv8/transition.S (revision eb5ba3ae)
1/*
2 * (C) Copyright 2013
3 * David Feng <fenghua@phytium.com.cn>
4 *
5 * SPDX-License-Identifier:	GPL-2.0+
6 */
7
8#include <asm-offsets.h>
9#include <config.h>
10#include <linux/linkage.h>
11#include <asm/macro.h>
12
13ENTRY(armv8_switch_to_el2)
14	switch_el x6, 1f, 0f, 0f
150:
16	cmp x5, #ES_TO_AARCH64
17	b.eq 2f
18	/*
19	 * When loading 32-bit kernel, it will jump
20	 * to secure firmware again, and never return.
21	 */
22	bl armv8_el2_to_aarch32
232:
24	/*
25	 * x4 is kernel entry point or switch_to_el1
26	 * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
27         * When running in EL2 now, jump to the
28	 * address saved in x4.
29	 */
30	br x4
311:	armv8_switch_to_el2_m x4, x5, x6
32ENDPROC(armv8_switch_to_el2)
33
34ENTRY(armv8_switch_to_el1)
35	switch_el x6, 0f, 1f, 0f
360:
37	/* x4 is kernel entry point. When running in EL1
38	 * now, jump to the address saved in x4.
39	 */
40	br x4
411:	armv8_switch_to_el1_m x4, x5, x6
42ENDPROC(armv8_switch_to_el1)
43
44WEAK(armv8_el2_to_aarch32)
45	ret
46ENDPROC(armv8_el2_to_aarch32)
47