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feat(sys_reg_trace): enable trace system registers access from lower NS ELs

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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>
This commit is contained in:
Manish V Badarkhe 2021-06-29 11:44:20 +01:00
parent 2031d6166a
commit d4582d3088
11 changed files with 124 additions and 0 deletions
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36
lib/extensions/sys_reg_trace/aarch32/sys_reg_trace.c Normal file
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/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdbool.h>
#include <arch.h>
#include <arch_helpers.h>
#include <lib/extensions/sys_reg_trace.h>
static bool sys_reg_trace_supported(void)
{
uint32_t features;
features = read_id_dfr0() >> ID_DFR0_COPTRC_SHIFT;
return ((features & ID_DFR0_COPTRC_MASK) ==
ID_DFR0_COPTRC_SUPPORTED);
}
void sys_reg_trace_enable(void)
{
uint32_t val;
if (sys_reg_trace_supported()) {
/*
* NSACR.NSTRCDIS = b0
* enable NS system register access to implemented trace
* registers.
*/
val = read_nsacr();
val &= ~NSTRCDIS_BIT;
write_nsacr(val);
}
}

37
lib/extensions/sys_reg_trace/aarch64/sys_reg_trace.c Normal file
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/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdbool.h>
#include <arch.h>
#include <arch_helpers.h>
#include <lib/extensions/sys_reg_trace.h>
static bool sys_reg_trace_supported(void)
{
uint64_t features;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEVER_SHIFT;
return ((features & ID_AA64DFR0_TRACEVER_MASK) ==
ID_AA64DFR0_TRACEVER_SUPPORTED);
}
void sys_reg_trace_enable(cpu_context_t *ctx)
{
uint64_t val;
if (sys_reg_trace_supported()) {
/* Retrieve CPTR_EL3 value from the given context 'ctx',
* and update CPTR_EL3.TTA bit to 0.
* This function is called while switching context to NS to
* allow system trace register access to NS-EL2 and NS-EL1
* when NS-EL2 is implemented but not used.
*/
val = read_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3);
val &= ~TTA_BIT;
write_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3, val);
}
}