u-boot/arch/arm/cpu/armv8/transition.S
Alison Wang 7c5e1feb1d armv8: aarch64: Fix the warning about x1-x3 nonzero issue
For 64-bit kernel, there is a warning about x1-x3 nonzero in violation
of boot protocol. To fix this issue, input argument 4 is added for
armv8_switch_to_el2 and armv8_switch_to_el1. The input argument 4 will
be set to the right value, such as zero.

Signed-off-by: Alison Wang <alison.wang@nxp.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: York Sun <york.sun@nxp.com>
2017-01-18 09:29:33 -08:00

46 lines
959 B
ArmAsm

/*
* (C) Copyright 2013
* David Feng <fenghua@phytium.com.cn>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>
ENTRY(armv8_switch_to_el2)
switch_el x6, 1f, 0f, 0f
0:
cmp x5, #ES_TO_AARCH64
b.eq 2f
/*
* When loading 32-bit kernel, it will jump
* to secure firmware again, and never return.
*/
bl armv8_el2_to_aarch32
2:
/*
* x4 is kernel entry point or switch_to_el1
* if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
* When running in EL2 now, jump to the
* address saved in x4.
*/
br x4
1: armv8_switch_to_el2_m x4, x5, x6
ENDPROC(armv8_switch_to_el2)
ENTRY(armv8_switch_to_el1)
switch_el x6, 0f, 1f, 0f
0:
/* x4 is kernel entry point. When running in EL1
* now, jump to the address saved in x4.
*/
br x4
1: armv8_switch_to_el1_m x4, x5, x6
ENDPROC(armv8_switch_to_el1)
WEAK(armv8_el2_to_aarch32)
ret
ENDPROC(armv8_el2_to_aarch32)