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603a0c6fae
At the moment we only support access to the trace unit by system registers (SYS_REG_TRACE) to be either unconditionally compiled in, or to be not supported at all. Add support for runtime detection (ENABLE_SYS_REG_TRACE_FOR_NS=2), by adding is_feat_sys_reg_trace_supported(). That function considers both build time settings and runtime information (if needed), and is used before we access SYS_REG_TRACE related registers. The FVP platform decided to compile in support unconditionally (=1), even though this is an optional feature, so it is not available with the FVP model's default command line. Change that to the now supported dynamic option (=2), so the right decision can be made by the code at runtime. Change-Id: I450a574a4f6bd9fc269887037049c94c906f54b2 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
25 lines
439 B
C
25 lines
439 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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void sys_reg_trace_enable(void)
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{
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uint32_t val;
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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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