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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>
26 lines
685 B
C
26 lines
685 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(cpu_context_t *ctx)
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{
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uint64_t val;
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/* Retrieve CPTR_EL3 value from the given context 'ctx',
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* and update CPTR_EL3.TTA bit to 0.
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* This function is called while switching context to NS to
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* allow system trace register access to NS-EL2 and NS-EL1
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* when NS-EL2 is implemented but not used.
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*/
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val = read_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3);
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val &= ~TTA_BIT;
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write_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3, val);
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}
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