u-boot/arch/arm/cpu/armv8/xen/lowlevel_init.S

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/* SPDX-License-Identifier: GPL-2.0+
*
* (C) 2017 NXP
* (C) 2020 EPAM Systems Inc.
*/
#include <config.h>
.align 8
.global rom_pointer
rom_pointer:
.space 32
/*
* Routine: save_boot_params (called after reset from start.S)
*/
.global save_boot_params
save_boot_params:
/* The firmware provided ATAG/FDT address can be found in r2/x0 */
adr x1, rom_pointer
stp x0, x2, [x1], #16
stp x3, x4, [x1], #16
/* Returns */
b save_boot_params_ret
.global restore_boot_params
restore_boot_params:
adr x1, rom_pointer
ldp x0, x2, [x1], #16
ldp x3, x4, [x1], #16
ret