mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-17 01:54:22 +00:00
123002f917
Currently MDCR_EL3 register value is same for all the worlds(Non-secure, Secure, Realm and Root). With this approach, features enable/disable settings remain same across all the worlds. This is not ideal as there must be flexibility in controlling feature as per the requirements for individual world. The patch addresses this by providing MDCR_EL3 a per world value. Features with identical values for all the worlds are grouped under ``manage_extensions_common`` API. Change-Id: Ibc068d985fe165d8cb6d0ffb84119bffd743b3d1 Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2021-2024, Arm Limited. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <arch.h>
|
|
#include <arch_features.h>
|
|
#include <arch_helpers.h>
|
|
#include <lib/el3_runtime/pubsub.h>
|
|
#include <lib/extensions/trbe.h>
|
|
|
|
static void tsb_csync(void)
|
|
{
|
|
/*
|
|
* The assembler does not yet understand the tsb csync mnemonic
|
|
* so use the equivalent hint instruction.
|
|
*/
|
|
__asm__ volatile("hint #18");
|
|
}
|
|
|
|
void trbe_enable(cpu_context_t *ctx)
|
|
{
|
|
el3_state_t *state = get_el3state_ctx(ctx);
|
|
u_register_t mdcr_el3_val = read_ctx_reg(state, CTX_MDCR_EL3);
|
|
|
|
/*
|
|
* MDCR_EL3.NSTBE = 0b0
|
|
* Trace Buffer owning Security state is Non-secure state. If FEAT_RME
|
|
* is not implemented, this field is RES0.
|
|
*
|
|
* MDCR_EL3.NSTB = 0b11
|
|
* Allow access of trace buffer control registers from NS-EL1 and
|
|
* NS-EL2, tracing is prohibited in Secure and Realm state (if
|
|
* implemented).
|
|
*/
|
|
mdcr_el3_val |= MDCR_NSTB(MDCR_NSTB_EL1);
|
|
mdcr_el3_val &= ~(MDCR_NSTBE_BIT);
|
|
write_ctx_reg(state, CTX_MDCR_EL3, mdcr_el3_val);
|
|
}
|
|
|
|
void trbe_init_el2_unused(void)
|
|
{
|
|
/*
|
|
* MDCR_EL2.E2TB: Set to zero so that the trace Buffer
|
|
* owning exception level is NS-EL1 and, tracing is
|
|
* prohibited at NS-EL2. These bits are RES0 when
|
|
* FEAT_TRBE is not implemented.
|
|
*/
|
|
write_mdcr_el2(read_mdcr_el2() & ~MDCR_EL2_E2TB(MDCR_EL2_E2TB_EL1));
|
|
}
|
|
|
|
static void *trbe_drain_trace_buffers_hook(const void *arg __unused)
|
|
{
|
|
if (is_feat_trbe_supported()) {
|
|
/*
|
|
* Before switching from normal world to secure world
|
|
* the trace buffers need to be drained out to memory. This is
|
|
* required to avoid an invalid memory access when TTBR is switched
|
|
* for entry to S-EL1.
|
|
*/
|
|
tsb_csync();
|
|
dsbnsh();
|
|
}
|
|
|
|
return (void *)0;
|
|
}
|
|
|
|
SUBSCRIBE_TO_EVENT(cm_entering_secure_world, trbe_drain_trace_buffers_hook);
|