mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 07:57:21 +00:00
7c5e1feb1d
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>
46 lines
959 B
ArmAsm
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)
|