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arm-trusted-firmware/make_helpers/arch_features.mk

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refactor(el3-runtime): add arch-features detection mechanism This patch adds architectural features detection procedure to ensure features enabled are present in the given hardware implementation. It verifies whether the architecture build flags passed during compilation match the respective features by reading their ID registers. It reads through all the enabled feature specific ID registers at once and panics in case of mismatch(feature enabled but not implemented in PE). Feature flags are used at sections (context_management, save and restore routines of registers) during context switch. If the enabled feature flag is not supported by the PE, it causes an exception while saving or restoring the registers guarded by them. With this mechanism, the build flags are validated at an early phase prior to their usage, thereby preventing any undefined action under their control. This implementation is based on tristate approach for each feature and currently FEAT_STATE=0 and FEAT_STATE=1 are covered as part of this patch. FEAT_STATE=2 is planned for phase-2 implementation and will be taken care separately. The patch has been explicitly tested, by adding a new test_config with build config enabling majority of the features and detected all of them under FVP launched with parameters enabling v8.7 features. Note: This is an experimental procedure and the mechanism itself is guarded by a macro "FEATURE_DETECTION", which is currently being disabled by default. The "FEATURE_DETECTION" macro is documented and the platforms are encouraged to make use of this diagnostic tool by enabling this "FEATURE_DETECTION" flag explicitly and get used to its behaviour during booting before the procedure gets mandated. Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> Change-Id: Ia23d95430fe82d417a938b672bfb5edc401b0f43
2022-01-17 18:57:17 +00:00
#
# Copyright (c) 2022, Arm Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
# This file lists all the checks related to the Architectural Feature
# Enablement flags, based on the Architectural version.
# Enable the features which are mandatory from ARCH version 8.1 and upwards.
ifeq "8.1" "$(word 1, $(sort 8.1 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
ENABLE_FEAT_PAN = 1
ENABLE_FEAT_VHE = 1
endif
# Enable the features which are mandatory from ARCH version 8.4 and upwards.
ifeq "8.4" "$(word 1, $(sort 8.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
ENABLE_FEAT_DIT = 1
ENABLE_FEAT_SEL2 = 1
endif
# Enable the features which are mandatory from ARCH version 8.5 and upwards.
ifeq "8.5" "$(word 1, $(sort 8.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
ENABLE_FEAT_SB = 1
endif
# Enable the features which are mandatory from ARCH version 8.6 and upwards.
ifeq "8.6" "$(word 1, $(sort 8.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
ENABLE_FEAT_FGT = 1
ENABLE_FEAT_ECV = 1
endif
# Enable the features which are mandatory from ARCH version 8.7 and upwards.
ifeq "8.7" "$(word 1, $(sort 8.7 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
ENABLE_FEAT_HCX = 1
endif