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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>
26 lines
641 B
C
26 lines
641 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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*
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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_val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT);
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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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