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edebefbcbc
Restricts MPAM to only NS world and enables trap to EL3 for access of MPAM registers from lower ELs of Secure and Realm world. This patch removes MPAM enablement from global context and adds it to EL3 State context which enables/disables MPAM during world switches. Renamed ENABLE_MPAM_FOR_LOWER_ELS to ENABLE_FEAT_MPAM and removed mpam_init_el3() as RESET behaviour is trapping. Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com> Change-Id: I131f9dba5df236a71959b2d425ee11af7f3c38c4
41 lines
924 B
C
41 lines
924 B
C
/*
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* Copyright (c) 2018-2023, Arm Limited and Contributors. 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_features.h>
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#include <arch_helpers.h>
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#include <lib/extensions/mpam.h>
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void mpam_enable(cpu_context_t *context)
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{
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u_register_t mpam3_el3;
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mpam3_el3 = read_ctx_reg(get_el3state_ctx(context), CTX_MPAM3_EL3);
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/*
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* Enable MPAM, and disable trapping to EL3 when lower ELs access their
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* own MPAM registers
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*/
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mpam3_el3 = (mpam3_el3 | MPAM3_EL3_MPAMEN_BIT) &
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~(MPAM3_EL3_TRAPLOWER_BIT);
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write_ctx_reg(get_el3state_ctx(context), CTX_MPAM3_EL3, mpam3_el3);
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}
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/*
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* If EL2 is implemented but unused, disable trapping to EL2 when lower ELs
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* access their own MPAM registers.
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*/
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void mpam_init_el2_unused(void)
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{
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write_mpam2_el2(0ULL);
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if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U) {
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write_mpamhcr_el2(0ULL);
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}
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}
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