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9890eab574
It used to be the case that a FEAT_RME build could not be built with
FEAT_BRBE support. BRBE doesn't have a 3-world aware disable and
MDCR_EL3 was not context switched to allow for disabling in Realm world.
As of commit 123002f917 MDCR_EL3 is
context switched. Since the flag for BRBE support is
ENABLE_BRBE_FOR_NS, move brbe_enable() to only happen for NS world. The
other worlds will see BRBE disabled and branch recording prohibited.
This allows for a build with both RME and BRBE.
Note that EL2 BRBE registers are not context switched. Further work is
needed if non-NS support is required.
Change-Id: I82f0f08399dcd080902477dc9636bc4541685f89
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
28 lines
748 B
C
28 lines
748 B
C
/*
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* Copyright (c) 2022-2024, 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 <arch.h>
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#include <arch_features.h>
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#include <arch_helpers.h>
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#include <lib/extensions/brbe.h>
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void brbe_enable(cpu_context_t *ctx)
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{
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el3_state_t *state = get_el3state_ctx(ctx);
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u_register_t mdcr_el3_val = read_ctx_reg(state, CTX_MDCR_EL3);
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/*
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* MDCR_EL3.SBRBE = 0b01
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* Allows BRBE usage in non-secure world and prohibited in
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* secure world.
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*
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* MDCR_EL3.{E3BREW, E3BREC} = 0b00
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* Branch recording at EL3 is disabled
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*/
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mdcr_el3_val &= ~((MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT) | MDCR_E3BREW | MDCR_E3BREC);
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mdcr_el3_val |= (0x1UL << MDCR_SBRBE_SHIFT);
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write_ctx_reg(state, CTX_MDCR_EL3, mdcr_el3_val);
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}
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