1# 2# Copyright (c) 2022-2025, Arm Limited. All rights reserved. 3# 4# SPDX-License-Identifier: BSD-3-Clause 5# 6 7# This file lists all of the architectural features, and initializes 8# and enables them based on the configured architecture version. 9 10# This file follows the following format: 11# - Enable mandatory feature if not updated, as applicable to an Arch Version. 12# - By default disable any mandatory features if they have not been defined yet. 13# - Disable or enable any optional feature this would be enabled/disabled if needed by platform. 14 15# 16################################################################################ 17# Enable Mandatory features if not updated yet, based on Arch versions. 18################################################################################ 19# 20 21# Enable the features which are mandatory from ARCH version 8.1 and upwards. 22ifeq "8.1" "$(word 1, $(sort 8.1 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 23armv8-1-a-feats := ENABLE_FEAT_PAN ENABLE_FEAT_VHE 24 25FEAT_LIST := ${armv8-1-a-feats} 26endif 27 28# Enable the features which are mandatory from ARCH version 8.2 and upwards. 29ifeq "8.2" "$(word 1, $(sort 8.2 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 30armv8-2-a-feats := ENABLE_FEAT_RAS 31# 8.1 Compliant 32armv8-2-a-feats += ${armv8-1-a-feats} 33 34FEAT_LIST := ${armv8-2-a-feats} 35endif 36 37# Enable the features which are mandatory from ARCH version 8.3 and upwards. 38ifeq "8.3" "$(word 1, $(sort 8.3 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 39# 8.2 Compliant 40armv8-3-a-feats += ${armv8-2-a-feats} 41 42FEAT_LIST := ${armv8-3-a-feats} 43endif 44 45# Enable the features which are mandatory from ARCH version 8.4 and upwards. 46ifeq "8.4" "$(word 1, $(sort 8.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 47armv8-4-a-feats := ENABLE_FEAT_SEL2 ENABLE_TRF_FOR_NS ENABLE_FEAT_DIT 48# 8.3 Compliant 49armv8-4-a-feats += ${armv8-3-a-feats} 50 51FEAT_LIST := ${armv8-4-a-feats} 52endif 53 54# Enable the features which are mandatory from ARCH version 8.5 and upwards. 55ifeq "8.5" "$(word 1, $(sort 8.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 56armv8-5-a-feats := ENABLE_FEAT_RNG ENABLE_FEAT_SB 57# 8.4 Compliant 58armv8-5-a-feats += ${armv8-4-a-feats} 59 60FEAT_LIST := ${armv8-5-a-feats} 61endif 62 63# Enable the features which are mandatory from ARCH version 8.6 and upwards. 64ifeq "8.6" "$(word 1, $(sort 8.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 65armv8-6-a-feats := ENABLE_FEAT_ECV ENABLE_FEAT_FGT 66# 8.5 Compliant 67armv8-6-a-feats += ${armv8-5-a-feats} 68FEAT_LIST := ${armv8-6-a-feats} 69endif 70 71# Enable the features which are mandatory from ARCH version 8.7 and upwards. 72ifeq "8.7" "$(word 1, $(sort 8.7 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 73armv8-7-a-feats := ENABLE_FEAT_HCX 74# 8.6 Compliant 75armv8-7-a-feats += ${armv8-6-a-feats} 76FEAT_LIST := ${armv8-7-a-feats} 77endif 78 79# Enable the features which are mandatory from ARCH version 8.8 and upwards. 80ifeq "8.8" "$(word 1, $(sort 8.8 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 81armv8-8-a-feats := ENABLE_FEAT_MOPS 82# 8.7 Compliant 83armv8-8-a-feats += ${armv8-7-a-feats} 84FEAT_LIST := ${armv8-8-a-feats} 85endif 86 87# Enable the features which are mandatory from ARCH version 8.9 and upwards. 88ifeq "8.9" "$(word 1, $(sort 8.9 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 89armv8-9-a-feats := ENABLE_FEAT_TCR2 ENABLE_FEAT_DEBUGV8P9 \ 90 ENABLE_FEAT_SCTLR2 ENABLE_FEAT_CLRBHB 91# 8.8 Compliant 92armv8-9-a-feats += ${armv8-8-a-feats} 93FEAT_LIST := ${armv8-9-a-feats} 94endif 95 96# Enable the features which are mandatory from ARCH version 9.0 and upwards. 97ifeq "9.0" "$(word 1, $(sort 9.0 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 98# 8.5 Compliant 99armv9-0-a-feats += ${armv8-5-a-feats} 100FEAT_LIST := ${armv9-0-a-feats} 101endif 102 103# Enable the features which are mandatory from ARCH version 9.1 and upwards. 104ifeq "9.1" "$(word 1, $(sort 9.1 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 105# 8.6 and 9.0 Compliant 106armv9-1-a-feats += ${armv8-6-a-feats} ${armv9-0-a-feats} 107FEAT_LIST := ${armv9-1-a-feats} 108endif 109 110# Enable the features which are mandatory from ARCH version 9.2 and upwards. 111ifeq "9.2" "$(word 1, $(sort 9.2 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 112# 8.7 and 9.1 Compliant 113armv9-2-a-feats += ${armv8-7-a-feats} ${armv9-1-a-feats} 114FEAT_LIST := ${armv9-2-a-feats} 115endif 116 117# Enable the features which are mandatory from ARCH version 9.3 and upwards. 118ifeq "9.3" "$(word 1, $(sort 9.3 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 119# 8.8 and 9.2 Compliant 120armv9-3-a-feats += ${armv8-8-a-feats} ${armv9-2-a-feats} 121FEAT_LIST := ${armv9-3-a-feats} 122endif 123 124# Enable the features which are mandatory from ARCH version 9.4 and upwards. 125ifeq "9.4" "$(word 1, $(sort 9.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 126# 8.9 and 9.3 Compliant 127armv9-4-a-feats += ${armv8-9-a-feats} ${armv9-3-a-feats} 128FEAT_LIST := ${armv9-4-a-feats} 129endif 130 131# Enable the features which are mandatory from ARCH version 9.5 and upwards. 132ifeq "9.5" "$(word 1, $(sort 9.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 133# 9.4 Compliant 134armv9-5-a-feats += ${armv9-4-a-feats} 135FEAT_LIST := ${armv9-5-a-feats} 136endif 137 138# Enable the features which are mandatory from ARCH version 9.6 and upwards. 139ifeq "9.6" "$(word 1, $(sort 9.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))" 140# 9.5 Compliant 141armv9-6-a-feats += ${armv9-5-a-feats} 142FEAT_LIST := ${armv9-6-a-feats} 143endif 144 145# Set all FEAT_* in FEAT_LIST to '1' if they are not yet defined or set 146# from build commandline options or platform makefile. 147$(eval $(call default_ones, ${sort ${FEAT_LIST}})) 148 149# 150################################################################################ 151# Set mandatory features by default to zero, if they are not already updated. 152################################################################################ 153# 154 155#---- 156# 8.1 157#---- 158 159# Flag to enable access to Privileged Access Never bit of PSTATE. 160ENABLE_FEAT_PAN ?= 0 161 162# Flag to enable Virtualization Host Extensions. 163ENABLE_FEAT_VHE ?= 0 164 165#---- 166# 8.2 167#---- 168 169# Enable RAS Support. 170ENABLE_FEAT_RAS ?= 0 171 172#---- 173# 8.3 174#---- 175 176# Flag to enable Pointer Authentication. Internal flag not meant for 177# direct setting. Use BRANCH_PROTECTION to enable PAUTH. 178ENABLE_PAUTH ?= 0 179 180# FEAT_PAUTH_LR is an optional architectural feature, so this flag must be set 181# manually in addition to the BRANCH_PROTECTION flag which is used for other 182# branch protection and pointer authentication features. 183ENABLE_FEAT_PAUTH_LR ?= 0 184 185# Include pointer authentication (ARMv8.3-PAuth) registers in cpu context. This 186# must be set to 1 if the platform wants to use this feature in the Secure 187# world. It is not necessary for use in the Non-secure world. 188CTX_INCLUDE_PAUTH_REGS ?= 0 189 190 191#---- 192# 8.4 193#---- 194 195# Flag to enable Secure EL-2 feature. 196ENABLE_FEAT_SEL2 ?= 0 197 198# By default, disable trace filter control register access to lower non-secure 199# exception levels, i.e. NS-EL2, or NS-EL1 if NS-EL2 is implemented, but 200# trace filter control register access is unused if FEAT_TRF is implemented. 201ENABLE_TRF_FOR_NS ?= 0 202 203# Flag to enable Data Independent Timing instructions. 204ENABLE_FEAT_DIT ?= 0 205 206#---- 207# 8.5 208#---- 209 210# Flag to enable Branch Target Identification. 211# Internal flag not meant for direct setting. 212# Use BRANCH_PROTECTION to enable BTI. 213ENABLE_BTI ?= 0 214 215# Flag to enable access to the Random Number Generator registers. 216ENABLE_FEAT_RNG ?= 0 217 218# Flag to enable Speculation Barrier Instruction. 219ENABLE_FEAT_SB ?= 0 220 221#---- 222# 8.6 223#---- 224 225# Flag to enable access to the CNTPOFF_EL2 register. 226ENABLE_FEAT_ECV ?= 0 227 228# Flag to enable access to the HDFGRTR_EL2 register. 229ENABLE_FEAT_FGT ?= 0 230 231#---- 232# 8.7 233#---- 234 235# Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn. 236ENABLE_FEAT_HCX ?= 0 237 238#---- 239# 8.8 240#---- 241 242# Flag to enable FEAT_MOPS (Standardization of Memory operations) 243# when INIT_UNUSED_NS_EL2 = 1 244ENABLE_FEAT_MOPS ?= 0 245 246#---- 247# 8.9 248#---- 249 250# Flag to enable access to TCR2 (FEAT_TCR2). 251ENABLE_FEAT_TCR2 ?= 0 252 253# Flag to enable access to SCTLR2 (FEAT_SCTLR2). 254ENABLE_FEAT_SCTLR2 ?= 0 255 256# 257################################################################################ 258# Optional Features defaulted to 0 or 2, if they are not enabled from 259# build option. Can also be disabled or enabled by platform if needed. 260################################################################################ 261# 262 263#---- 264# 8.0 265#---- 266 267# Flag to enable support for clrbhb instruction. 268ENABLE_FEAT_CLRBHB ?= 0 269 270# Flag to enable CSV2_2 extension. 271ENABLE_FEAT_CSV2_2 ?= 0 272 273# Flag to enable CSV2_3 extension. FEAT_CSV2_3 enables access to the 274# SCXTNUM_ELx register. 275ENABLE_FEAT_CSV2_3 ?= 0 276 277# By default, disable access of trace system registers from NS lower 278# ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused if 279# system register trace is implemented. This feature is available if 280# trace unit such as ETMv4.x, This feature is OPTIONAL and is only 281# permitted in Armv8 implementations. 282ENABLE_SYS_REG_TRACE_FOR_NS ?= 0 283 284#---- 285# 8.2 286#---- 287 288# Build option to enable/disable the Statistical Profiling Extension, 289# keep it enabled by default for AArch64. 290ifeq (${ARCH},aarch64) 291 ENABLE_SPE_FOR_NS ?= 2 292else ifeq (${ARCH},aarch32) 293 ENABLE_SPE_FOR_NS := 0 294endif 295 296# Enable SVE for non-secure world by default. 297ifeq (${ARCH},aarch64) 298 ENABLE_SVE_FOR_NS ?= 2 299# SVE is only supported on AArch64 so disable it on AArch32. 300else ifeq (${ARCH},aarch32) 301 ENABLE_SVE_FOR_NS := 0 302endif 303 304#---- 305# 8.4 306#---- 307 308# Feature flags for supporting Activity monitor extensions. 309ENABLE_FEAT_AMU ?= 0 310ENABLE_AMU_AUXILIARY_COUNTERS ?= 0 311AMU_RESTRICT_COUNTERS ?= 1 312 313# Build option to enable MPAM for lower ELs. 314# Enabling it by default 315ifeq (${ARCH},aarch64) 316 ENABLE_FEAT_MPAM ?= 2 317else ifeq (${ARCH},aarch32) 318 ENABLE_FEAT_MPAM := 0 319endif 320 321# Include nested virtualization control (Armv8.4-NV) registers in cpu context. 322# This must be set to 1 if architecture implements Nested Virtualization 323# Extension and platform wants to use this feature in the Secure world. 324CTX_INCLUDE_NEVE_REGS ?= 0 325 326#---- 327# 8.5 328#---- 329 330# Flag to enable support for EL3 trapping of reads of the RNDR and RNDRRS 331# registers, by setting SCR_EL3.TRNDR. 332ENABLE_FEAT_RNG_TRAP ?= 0 333 334# Enable FEAT_MTE2. This must be set to 1 if the platform wants 335# to use this feature and is enabled at ELX. 336ENABLE_FEAT_MTE2 ?= 0 337 338#---- 339# 8.6 340#---- 341 342# Flag to enable AMUv1p1 extension. 343ENABLE_FEAT_AMUv1p1 ?= 0 344 345# Flag to enable delayed trapping of WFE instruction (FEAT_TWED). 346ENABLE_FEAT_TWED ?= 0 347 348# In v8.6+ platforms with delayed trapping of WFE being supported 349# via FEAT_TWED, this flag takes the delay value to be set in the 350# SCR_EL3.TWEDEL(4bit) field, when FEAT_TWED is implemented. 351# By default it takes 0, and need to be updated by the platforms. 352TWED_DELAY ?= 0 353 354# Disable MTPMU if FEAT_MTPMU is supported. 355DISABLE_MTPMU ?= 0 356 357# Flag to enable FEAT_FGT2 (Fine Granular Traps 2) 358ENABLE_FEAT_FGT2 ?= 0 359 360# LoadStore64Bytes extension using the ACCDATA_EL1 system register 361ENABLE_FEAT_LS64_ACCDATA ?= 0 362 363#---- 364# 8.8 365#---- 366 367# Flag to enable FEAT_THE (Translation Hardening Extension) 368ENABLE_FEAT_THE ?= 0 369 370#---- 371# 8.9 372#---- 373 374# Flag to enable access to Stage 2 Permission Indirection (FEAT_S2PIE). 375ENABLE_FEAT_S2PIE ?= 0 376 377# Flag to enable access to Stage 1 Permission Indirection (FEAT_S1PIE). 378ENABLE_FEAT_S1PIE ?= 0 379 380# Flag to enable access to Stage 2 Permission Overlay (FEAT_S2POE). 381ENABLE_FEAT_S2POE ?= 0 382 383# Flag to enable access to Stage 1 Permission Overlay (FEAT_S1POE). 384ENABLE_FEAT_S1POE ?= 0 385 386# Flag to enable access to Arm v8.9 Debug extension 387ENABLE_FEAT_DEBUGV8P9 ?= 0 388 389# AIE extension using the (A)MAIR2 system registers 390ENABLE_FEAT_AIE ?= 0 391 392# PFAR extension using the PFAR system registers 393ENABLE_FEAT_PFAR ?= 0 394 395#---- 396# 9.0 397#---- 398 399# Scalable Matrix Extension for non-secure world. 400ENABLE_SME_FOR_NS ?= 0 401 402# Scalable Vector Extension for secure world. 403ENABLE_SVE_FOR_SWD ?= 0 404 405# By default, disable access of trace buffer control registers from NS 406# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 407# if FEAT_TRBE is implemented. 408# Note FEAT_TRBE is only supported on AArch64 - therefore do not enable in 409# AArch32. 410ifeq (${ARCH},aarch64) 411 ENABLE_TRBE_FOR_NS ?= 0 412else ifeq (${ARCH},aarch32) 413 ifneq ($(or $(ENABLE_TRBE_FOR_NS),0),0) 414 $(error ENABLE_TRBE_FOR_NS is not supported for AArch32) 415 else 416 ENABLE_TRBE_FOR_NS := 0 417 endif 418endif 419 420#---- 421# 9.2 422#---- 423 424# Flag to enable Realm Management Extension (FEAT_RME). 425ENABLE_RME ?= 0 426 427# Scalable Matrix Extension version 2 for non-secure world. 428ENABLE_SME2_FOR_NS ?= 0 429 430# Scalable Matrix Extension for secure world. 431ENABLE_SME_FOR_SWD ?= 0 432 433# By default, disable access to branch record buffer control registers from NS 434# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 435# if FEAT_BRBE is implemented. 436ENABLE_BRBE_FOR_NS ?= 0 437 438# Flag to enable Floating point exception Mode Register Feature (FEAT_FPMR) 439ENABLE_FEAT_FPMR ?= 0 440 441# Flag to enable Memory Encryption Contexts (FEAT_MEC). 442ENABLE_FEAT_MEC ?= 0 443 444#---- 445# 9.3 446#---- 447# Flag to enable access to Arm v9.3 FEAT_D128 extension 448ENABLE_FEAT_D128 ?= 0 449 450# Flag to enable access to GICv5 CPU interface extension (FEAT_GCIE) 451ENABLE_FEAT_GCIE ?= 0 452 453# Enables access to PE-side MPAM bandwidth controls (FEAT_MPAM_PE_BW_CTRL) 454ENABLE_FEAT_MPAM_PE_BW_CTRL ?= 0 455 456# Flag to enable Exception-based Event Profiling (FEAT_EBEP) 457ENABLE_FEAT_EBEP ?= 0 458 459#---- 460#9.4 461#---- 462 463# Flag to enable FEAT_RME_GDI 464ENABLE_FEAT_RME_GDI ?= 0 465 466# Flag to enable access to Guarded Control Stack (FEAT_GCS). 467ENABLE_FEAT_GCS ?= 0 468 469# Flag to enable Fine Grained Write Traps (FEAT_FGWTE3) for EL3. 470ENABLE_FEAT_FGWTE3 ?= 0 471 472# Flag to enable checked pointer arithmetic (FEAT_CPA2) for EL3. 473# We don't have a flag for FEAT_CPA since that has no effect on software 474ENABLE_FEAT_CPA2 ?= 0 475 476#---- 477#9.6 478#---- 479 480# Flag to enable trapping of ID registers to EL3 481ENABLE_FEAT_IDTE3 ?= 0 482