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d4582d3088
Introduced a build flag 'ENABLE_SYS_REG_TRACE_FOR_NS' to enable trace system registers access in NS-EL2, or NS-EL1 (when NS-EL2 is implemented but unused). Change-Id: Idc1acede4186e101758cbf7bed5af7b634d7d18d Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
36 lines
678 B
C
36 lines
678 B
C
/*
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* Copyright (c) 2021, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdbool.h>
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#include <arch.h>
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#include <arch_helpers.h>
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#include <lib/extensions/sys_reg_trace.h>
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static bool sys_reg_trace_supported(void)
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{
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uint32_t features;
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features = read_id_dfr0() >> ID_DFR0_COPTRC_SHIFT;
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return ((features & ID_DFR0_COPTRC_MASK) ==
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ID_DFR0_COPTRC_SUPPORTED);
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}
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void sys_reg_trace_enable(void)
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{
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uint32_t val;
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if (sys_reg_trace_supported()) {
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/*
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* NSACR.NSTRCDIS = b0
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* enable NS system register access to implemented trace
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* registers.
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*/
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val = read_nsacr();
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val &= ~NSTRCDIS_BIT;
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write_nsacr(val);
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}
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}
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