1*91f16700Schasinglulu/* 2*91f16700Schasinglulu * Copyright (C) 2018 Marvell International Ltd. 3*91f16700Schasinglulu * 4*91f16700Schasinglulu * SPDX-License-Identifier: BSD-3-Clause 5*91f16700Schasinglulu * https://spdx.org/licenses 6*91f16700Schasinglulu */ 7*91f16700Schasinglulu 8*91f16700Schasinglulu#include <asm_macros.S> 9*91f16700Schasinglulu#include <marvell_def.h> 10*91f16700Schasinglulu#include <platform_def.h> 11*91f16700Schasinglulu 12*91f16700Schasinglulu#define PTE_NON_EXEC_OFF 54 /* XN - eXecute Never bit offset - see VMSAv8-64 */ 13*91f16700Schasinglulu 14*91f16700Schasinglulu .globl marvell_ble_prepare_exit 15*91f16700Schasinglulu 16*91f16700Schasinglulufunc marvell_ble_prepare_exit 17*91f16700Schasinglulu /* 18*91f16700Schasinglulu * Read the page table base and set the first page to be executable. 19*91f16700Schasinglulu * This is required for jumping to DRAM for further execution. 20*91f16700Schasinglulu */ 21*91f16700Schasinglulu mrs x0, ttbr0_el3 22*91f16700Schasinglulu ldr x1, [x0] 23*91f16700Schasinglulu mov x2, #1 24*91f16700Schasinglulu bic x1, x1, x2, lsl #PTE_NON_EXEC_OFF 25*91f16700Schasinglulu str x1, [x0] 26*91f16700Schasinglulu tlbi alle3 27*91f16700Schasinglulu dsb sy 28*91f16700Schasinglulu isb 29*91f16700Schasinglulu ret 30*91f16700Schasingluluendfunc marvell_ble_prepare_exit 31