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 := ENABLE_FEAT_UINJ 142armv9-6-a-feats += ${armv9-5-a-feats} 143FEAT_LIST := ${armv9-6-a-feats} 144endif 145 146# Set all FEAT_* in FEAT_LIST to '1' if they are not yet defined or set 147# from build commandline options or platform makefile. 148$(eval $(call default_ones, ${sort ${FEAT_LIST}})) 149 150# 151################################################################################ 152# Set mandatory features by default to zero, if they are not already updated. 153################################################################################ 154# 155 156#---- 157# 8.1 158#---- 159 160# Flag to enable access to Privileged Access Never bit of PSTATE. 161ENABLE_FEAT_PAN ?= 0 162 163# Flag to enable Virtualization Host Extensions. 164ENABLE_FEAT_VHE ?= 0 165 166#---- 167# 8.2 168#---- 169 170# Enable RAS Support. 171ENABLE_FEAT_RAS ?= 0 172 173#---- 174# 8.3 175#---- 176 177# Flag to enable Pointer Authentication. Internal flag not meant for 178# direct setting. Use BRANCH_PROTECTION to enable PAUTH. 179ENABLE_PAUTH ?= 0 180 181# FEAT_PAUTH_LR is an optional architectural feature, so this flag must be set 182# manually in addition to the BRANCH_PROTECTION flag which is used for other 183# branch protection and pointer authentication features. 184ENABLE_FEAT_PAUTH_LR ?= 0 185 186# Include pointer authentication (ARMv8.3-PAuth) registers in cpu context. This 187# must be set to 1 if the platform wants to use this feature in the Secure 188# world. It is not necessary for use in the Non-secure world. 189CTX_INCLUDE_PAUTH_REGS ?= 0 190 191 192#---- 193# 8.4 194#---- 195 196# Flag to enable Secure EL-2 feature. 197ENABLE_FEAT_SEL2 ?= 0 198 199# By default, disable trace filter control register access to lower non-secure 200# exception levels, i.e. NS-EL2, or NS-EL1 if NS-EL2 is implemented, but 201# trace filter control register access is unused if FEAT_TRF is implemented. 202ENABLE_TRF_FOR_NS ?= 0 203 204# Flag to enable Data Independent Timing instructions. 205ENABLE_FEAT_DIT ?= 0 206 207#---- 208# 8.5 209#---- 210 211# Flag to enable Branch Target Identification. 212# Internal flag not meant for direct setting. 213# Use BRANCH_PROTECTION to enable BTI. 214ENABLE_BTI ?= 0 215 216# Flag to enable access to the Random Number Generator registers. 217ENABLE_FEAT_RNG ?= 0 218 219# Flag to enable Speculation Barrier Instruction. 220ENABLE_FEAT_SB ?= 0 221 222#---- 223# 8.6 224#---- 225 226# Flag to enable access to the CNTPOFF_EL2 register. 227ENABLE_FEAT_ECV ?= 0 228 229# Flag to enable access to the HDFGRTR_EL2 register. 230ENABLE_FEAT_FGT ?= 0 231 232#---- 233# 8.7 234#---- 235 236# Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn. 237ENABLE_FEAT_HCX ?= 0 238 239#---- 240# 8.8 241#---- 242 243# Flag to enable FEAT_MOPS (Standardization of Memory operations) 244# when INIT_UNUSED_NS_EL2 = 1 245ENABLE_FEAT_MOPS ?= 0 246 247#---- 248# 8.9 249#---- 250 251# Flag to enable access to TCR2 (FEAT_TCR2). 252ENABLE_FEAT_TCR2 ?= 0 253 254# Flag to enable access to SCTLR2 (FEAT_SCTLR2). 255ENABLE_FEAT_SCTLR2 ?= 0 256 257# 258################################################################################ 259# Optional Features defaulted to 0 or 2, if they are not enabled from 260# build option. Can also be disabled or enabled by platform if needed. 261################################################################################ 262# 263 264#---- 265# 8.0 266#---- 267 268# Flag to enable support for clrbhb instruction. 269ENABLE_FEAT_CLRBHB ?= 0 270 271# Flag to enable CSV2_2 extension. 272ENABLE_FEAT_CSV2_2 ?= 0 273 274# Flag to enable CSV2_3 extension. FEAT_CSV2_3 enables access to the 275# SCXTNUM_ELx register. 276ENABLE_FEAT_CSV2_3 ?= 0 277 278# By default, disable access of trace system registers from NS lower 279# ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused if 280# system register trace is implemented. This feature is available if 281# trace unit such as ETMv4.x, This feature is OPTIONAL and is only 282# permitted in Armv8 implementations. 283ENABLE_SYS_REG_TRACE_FOR_NS ?= 0 284 285#---- 286# 8.2 287#---- 288 289# Build option to enable/disable the Statistical Profiling Extension, 290# keep it enabled by default for AArch64. 291ifeq (${ARCH},aarch64) 292 ENABLE_SPE_FOR_NS ?= 2 293else ifeq (${ARCH},aarch32) 294 ENABLE_SPE_FOR_NS := 0 295endif 296 297# Enable SVE for non-secure world by default. 298ifeq (${ARCH},aarch64) 299 ENABLE_SVE_FOR_NS ?= 2 300# SVE is only supported on AArch64 so disable it on AArch32. 301else ifeq (${ARCH},aarch32) 302 ENABLE_SVE_FOR_NS := 0 303endif 304 305#---- 306# 8.4 307#---- 308 309# Feature flags for supporting Activity monitor extensions. 310ENABLE_FEAT_AMU ?= 0 311ENABLE_AMU_AUXILIARY_COUNTERS ?= 0 312AMU_RESTRICT_COUNTERS ?= 1 313 314# Build option to enable MPAM for lower ELs. 315# Enabling it by default 316ifeq (${ARCH},aarch64) 317 ENABLE_FEAT_MPAM ?= 2 318else ifeq (${ARCH},aarch32) 319 ENABLE_FEAT_MPAM := 0 320endif 321 322# Include nested virtualization control (Armv8.4-NV) registers in cpu context. 323# This must be set to 1 if architecture implements Nested Virtualization 324# Extension and platform wants to use this feature in the Secure world. 325CTX_INCLUDE_NEVE_REGS ?= 0 326 327#---- 328# 8.5 329#---- 330 331# Flag to enable support for EL3 trapping of reads of the RNDR and RNDRRS 332# registers, by setting SCR_EL3.TRNDR. 333ENABLE_FEAT_RNG_TRAP ?= 0 334 335# Enable FEAT_MTE2. This must be set to 1 if the platform wants 336# to use this feature and is enabled at ELX. 337ENABLE_FEAT_MTE2 ?= 0 338 339#---- 340# 8.6 341#---- 342 343# Flag to enable AMUv1p1 extension. 344ENABLE_FEAT_AMUv1p1 ?= 0 345 346# Flag to enable delayed trapping of WFE instruction (FEAT_TWED). 347ENABLE_FEAT_TWED ?= 0 348 349# In v8.6+ platforms with delayed trapping of WFE being supported 350# via FEAT_TWED, this flag takes the delay value to be set in the 351# SCR_EL3.TWEDEL(4bit) field, when FEAT_TWED is implemented. 352# By default it takes 0, and need to be updated by the platforms. 353TWED_DELAY ?= 0 354 355# Disable MTPMU if FEAT_MTPMU is supported. 356DISABLE_MTPMU ?= 0 357 358# Flag to enable FEAT_FGT2 (Fine Granular Traps 2) 359ENABLE_FEAT_FGT2 ?= 0 360 361# LoadStore64Bytes extension using the ACCDATA_EL1 system register 362ENABLE_FEAT_LS64_ACCDATA ?= 0 363 364#---- 365# 8.8 366#---- 367 368# Flag to enable FEAT_THE (Translation Hardening Extension) 369ENABLE_FEAT_THE ?= 0 370 371#---- 372# 8.9 373#---- 374 375# Flag to enable access to Stage 2 Permission Indirection (FEAT_S2PIE). 376ENABLE_FEAT_S2PIE ?= 0 377 378# Flag to enable access to Stage 1 Permission Indirection (FEAT_S1PIE). 379ENABLE_FEAT_S1PIE ?= 0 380 381# Flag to enable access to Stage 2 Permission Overlay (FEAT_S2POE). 382ENABLE_FEAT_S2POE ?= 0 383 384# Flag to enable access to Stage 1 Permission Overlay (FEAT_S1POE). 385ENABLE_FEAT_S1POE ?= 0 386 387# Flag to enable access to Arm v8.9 Debug extension 388ENABLE_FEAT_DEBUGV8P9 ?= 0 389 390# AIE extension using the (A)MAIR2 system registers 391ENABLE_FEAT_AIE ?= 0 392 393# PFAR extension using the PFAR system registers 394ENABLE_FEAT_PFAR ?= 0 395 396#---- 397# 9.0 398#---- 399 400# Scalable Matrix Extension for non-secure world. 401ENABLE_SME_FOR_NS ?= 0 402 403# Scalable Vector Extension for secure world. 404ENABLE_SVE_FOR_SWD ?= 0 405 406# By default, disable access of trace buffer control registers from NS 407# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 408# if FEAT_TRBE is implemented. 409# Note FEAT_TRBE is only supported on AArch64 - therefore do not enable in 410# AArch32. 411ifeq (${ARCH},aarch64) 412 ENABLE_TRBE_FOR_NS ?= 0 413else ifeq (${ARCH},aarch32) 414 ifneq ($(or $(ENABLE_TRBE_FOR_NS),0),0) 415 $(error ENABLE_TRBE_FOR_NS is not supported for AArch32) 416 else 417 ENABLE_TRBE_FOR_NS := 0 418 endif 419endif 420 421# Flag that enables hardware injection of undefined exceptions 422ENABLE_FEAT_UINJ ?= 0 423 424#---- 425# 9.2 426#---- 427 428# Flag to enable Realm Management Extension (FEAT_RME). 429ENABLE_RME ?= 0 430 431# Scalable Matrix Extension version 2 for non-secure world. 432ENABLE_SME2_FOR_NS ?= 0 433 434# Scalable Matrix Extension for secure world. 435ENABLE_SME_FOR_SWD ?= 0 436 437# By default, disable access to branch record buffer control registers from NS 438# lower ELs i.e. NS-EL2, or NS-EL1 if NS-EL2 implemented but unused 439# if FEAT_BRBE is implemented. 440ENABLE_BRBE_FOR_NS ?= 0 441 442# Flag to enable Floating point exception Mode Register Feature (FEAT_FPMR) 443ENABLE_FEAT_FPMR ?= 0 444 445# Flag to enable Memory Encryption Contexts (FEAT_MEC). 446ENABLE_FEAT_MEC ?= 0 447 448#---- 449# 9.3 450#---- 451# Flag to enable access to Arm v9.3 FEAT_D128 extension 452ENABLE_FEAT_D128 ?= 0 453 454# Flag to enable access to GICv5 CPU interface extension (FEAT_GCIE) 455ENABLE_FEAT_GCIE ?= 0 456 457# Enables access to PE-side MPAM bandwidth controls (FEAT_MPAM_PE_BW_CTRL) 458ENABLE_FEAT_MPAM_PE_BW_CTRL ?= 0 459 460# Flag to enable Exception-based Event Profiling (FEAT_EBEP) 461ENABLE_FEAT_EBEP ?= 0 462 463#---- 464#9.4 465#---- 466 467# Flag to enable FEAT_RME_GDI 468ENABLE_FEAT_RME_GDI ?= 0 469 470# Flag to enable access to Guarded Control Stack (FEAT_GCS). 471ENABLE_FEAT_GCS ?= 0 472 473# Flag to enable Fine Grained Write Traps (FEAT_FGWTE3) for EL3. 474ENABLE_FEAT_FGWTE3 ?= 0 475 476# Flag to enable checked pointer arithmetic (FEAT_CPA2) for EL3. 477# We don't have a flag for FEAT_CPA since that has no effect on software 478ENABLE_FEAT_CPA2 ?= 0 479 480#---- 481#9.6 482#---- 483 484# Flag to enable trapping of ID registers to EL3 485ENABLE_FEAT_IDTE3 ?= 0 486