1*4882a593Smuzhiyun/* 2*4882a593Smuzhiyun * (C) Copyright 2013 3*4882a593Smuzhiyun * David Feng <fenghua@phytium.com.cn> 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun#include <asm-offsets.h> 9*4882a593Smuzhiyun#include <config.h> 10*4882a593Smuzhiyun#include <linux/linkage.h> 11*4882a593Smuzhiyun#include <asm/macro.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun.pushsection .text.armv8_switch_to_el2, "ax" 14*4882a593SmuzhiyunENTRY(armv8_switch_to_el2) 15*4882a593Smuzhiyun switch_el x6, 1f, 0f, 0f 16*4882a593Smuzhiyun0: 17*4882a593Smuzhiyun cmp x5, #ES_TO_AARCH64 18*4882a593Smuzhiyun b.eq 2f 19*4882a593Smuzhiyun /* 20*4882a593Smuzhiyun * When loading 32-bit kernel, it will jump 21*4882a593Smuzhiyun * to secure firmware again, and never return. 22*4882a593Smuzhiyun */ 23*4882a593Smuzhiyun bl armv8_el2_to_aarch32 24*4882a593Smuzhiyun2: 25*4882a593Smuzhiyun /* 26*4882a593Smuzhiyun * x4 is kernel entry point or switch_to_el1 27*4882a593Smuzhiyun * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined. 28*4882a593Smuzhiyun * When running in EL2 now, jump to the 29*4882a593Smuzhiyun * address saved in x4. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun br x4 32*4882a593Smuzhiyun1: armv8_switch_to_el2_m x4, x5, x6 33*4882a593SmuzhiyunENDPROC(armv8_switch_to_el2) 34*4882a593Smuzhiyun.popsection 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun.pushsection .text.armv8_switch_to_el1, "ax" 37*4882a593SmuzhiyunENTRY(armv8_switch_to_el1) 38*4882a593Smuzhiyun switch_el x6, 0f, 1f, 0f 39*4882a593Smuzhiyun0: 40*4882a593Smuzhiyun /* x4 is kernel entry point. When running in EL1 41*4882a593Smuzhiyun * now, jump to the address saved in x4. 42*4882a593Smuzhiyun */ 43*4882a593Smuzhiyun br x4 44*4882a593Smuzhiyun1: armv8_switch_to_el1_m x4, x5, x6 45*4882a593SmuzhiyunENDPROC(armv8_switch_to_el1) 46*4882a593Smuzhiyun.popsection 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun.pushsection .text.armv8_el2_to_aarch32, "ax" 49*4882a593SmuzhiyunWEAK(armv8_el2_to_aarch32) 50*4882a593Smuzhiyun ret 51*4882a593SmuzhiyunENDPROC(armv8_el2_to_aarch32) 52*4882a593Smuzhiyun.popsection 53