1 /* 2 * Copyright (c) 2021, Arm Limited. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <stdbool.h> 8 9 #include <arch.h> 10 #include <arch_helpers.h> 11 #include <lib/extensions/sys_reg_trace.h> 12 sys_reg_trace_supported(void)13static bool sys_reg_trace_supported(void) 14 { 15 uint32_t features; 16 17 features = read_id_dfr0() >> ID_DFR0_COPTRC_SHIFT; 18 return ((features & ID_DFR0_COPTRC_MASK) == 19 ID_DFR0_COPTRC_SUPPORTED); 20 } 21 sys_reg_trace_enable(void)22void sys_reg_trace_enable(void) 23 { 24 uint32_t val; 25 26 if (sys_reg_trace_supported()) { 27 /* 28 * NSACR.NSTRCDIS = b0 29 * enable NS system register access to implemented trace 30 * registers. 31 */ 32 val = read_nsacr(); 33 val &= ~NSTRCDIS_BIT; 34 write_nsacr(val); 35 } 36 } 37