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| -rw-r--r-- | common/feat_detect.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/common/feat_detect.c b/common/feat_detect.c new file mode 100644 index 0000000..ee34588 --- /dev/null +++ b/common/feat_detect.c @@ -0,0 +1,334 @@ +/* + * Copyright (c) 2022, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <common/feat_detect.h> + +/******************************************************************************* + * This section lists the wrapper modules for each feature to evaluate the + * feature states (FEAT_STATE_1 and FEAT_STATE_2) and perform necessary action + * as below: + * + * It verifies whether the FEAT_XXX (eg: FEAT_SB) is supported by the PE or not. + * Without this check an exception would occur during context save/restore + * routines, if the feature is enabled but not supported by PE. + ******************************************************************************/ + +/****************************************** + * Feature : FEAT_SB (Speculation Barrier) + *****************************************/ +static void read_feat_sb(void) +{ +#if (ENABLE_FEAT_SB == FEAT_STATE_1) + feat_detect_panic(is_armv8_0_feat_sb_present(), "SB"); +#endif +} + +/****************************************************** + * Feature : FEAT_CSV2_2 (Cache Speculation Variant 2) + *****************************************************/ +static void read_feat_csv2_2(void) +{ +#if (ENABLE_FEAT_CSV2_2 == FEAT_STATE_1) + feat_detect_panic(is_armv8_0_feat_csv2_2_present(), "CSV2_2"); +#endif +} + +/*********************************************** + * Feature : FEAT_PAN (Privileged Access Never) + **********************************************/ +static void read_feat_pan(void) +{ +#if (ENABLE_FEAT_PAN == FEAT_STATE_1) + feat_detect_panic(is_armv8_1_pan_present(), "PAN"); +#endif +} + +/****************************************************** + * Feature : FEAT_VHE (Virtualization Host Extensions) + *****************************************************/ +static void read_feat_vhe(void) +{ +#if (ENABLE_FEAT_VHE == FEAT_STATE_1) + feat_detect_panic(is_armv8_1_vhe_present(), "VHE"); +#endif +} + +/******************************************************************************* + * Feature : FEAT_RAS (Reliability, Availability, and Serviceability Extension) + ******************************************************************************/ +static void read_feat_ras(void) +{ +#if (RAS_EXTENSION == FEAT_STATE_1) + feat_detect_panic(is_armv8_2_feat_ras_present(), "RAS"); +#endif +} + +/************************************************ + * Feature : FEAT_PAUTH (Pointer Authentication) + ***********************************************/ +static void read_feat_pauth(void) +{ +#if (ENABLE_PAUTH == FEAT_STATE_1) || (CTX_INCLUDE_PAUTH_REGS == FEAT_STATE_1) + feat_detect_panic(is_armv8_3_pauth_present(), "PAUTH"); +#endif +} + +/************************************************************ + * Feature : FEAT_DIT (Data Independent Timing Instructions) + ***********************************************************/ +static void read_feat_dit(void) +{ +#if (ENABLE_FEAT_DIT == FEAT_STATE_1) + feat_detect_panic(is_armv8_4_feat_dit_present(), "DIT"); +#endif +} + +/********************************************************* + * Feature : FEAT_AMUv1 (Activity Monitors Extensions v1) + ********************************************************/ +static void read_feat_amuv1(void) +{ +#if (ENABLE_FEAT_AMUv1 == FEAT_STATE_1) + feat_detect_panic(is_armv8_4_feat_amuv1_present(), "AMUv1"); +#endif +} + +/**************************************************************************** + * Feature : FEAT_MPAM (Memory Partitioning and Monitoring (MPAM) Extension) + ***************************************************************************/ +static void read_feat_mpam(void) +{ +#if (ENABLE_MPAM_FOR_LOWER_ELS == FEAT_STATE_1) + feat_detect_panic(get_mpam_version() != 0U, "MPAM"); +#endif +} + +/************************************************************** + * Feature : FEAT_NV2 (Enhanced Nested Virtualization Support) + *************************************************************/ +static void read_feat_nv2(void) +{ +#if (CTX_INCLUDE_NEVE_REGS == FEAT_STATE_1) + unsigned int nv = get_armv8_4_feat_nv_support(); + + feat_detect_panic((nv == ID_AA64MMFR2_EL1_NV2_SUPPORTED), "NV2"); +#endif +} + +/*********************************** + * Feature : FEAT_SEL2 (Secure EL2) + **********************************/ +static void read_feat_sel2(void) +{ +#if (ENABLE_FEAT_SEL2 == FEAT_STATE_1) + feat_detect_panic(is_armv8_4_sel2_present(), "SEL2"); +#endif +} + +/**************************************************** + * Feature : FEAT_TRF (Self-hosted Trace Extensions) + ***************************************************/ +static void read_feat_trf(void) +{ +#if (ENABLE_TRF_FOR_NS == FEAT_STATE_1) + feat_detect_panic(is_arm8_4_feat_trf_present(), "TRF"); +#endif +} + +/************************************************ + * Feature : FEAT_MTE (Memory Tagging Extension) + ***********************************************/ +static void read_feat_mte(void) +{ +#if (CTX_INCLUDE_MTE_REGS == FEAT_STATE_1) + unsigned int mte = get_armv8_5_mte_support(); + + feat_detect_panic((mte != MTE_UNIMPLEMENTED), "MTE"); +#endif +} + +/*********************************************** + * Feature : FEAT_RNG (Random Number Generator) + **********************************************/ +static void read_feat_rng(void) +{ +#if (ENABLE_FEAT_RNG == FEAT_STATE_1) + feat_detect_panic(is_armv8_5_rng_present(), "RNG"); +#endif +} + +/**************************************************** + * Feature : FEAT_BTI (Branch Target Identification) + ***************************************************/ +static void read_feat_bti(void) +{ +#if (ENABLE_BTI == FEAT_STATE_1) + feat_detect_panic(is_armv8_5_bti_present(), "BTI"); +#endif +} + +/**************************************** + * Feature : FEAT_FGT (Fine Grain Traps) + ***************************************/ +static void read_feat_fgt(void) +{ +#if (ENABLE_FEAT_FGT == FEAT_STATE_1) + feat_detect_panic(is_armv8_6_fgt_present(), "FGT"); +#endif +} + +/*********************************************** + * Feature : FEAT_AMUv1p1 (AMU Extensions v1.1) + **********************************************/ +static void read_feat_amuv1p1(void) +{ +#if (ENABLE_FEAT_AMUv1p1 == FEAT_STATE_1) + feat_detect_panic(is_armv8_6_feat_amuv1p1_present(), "AMUv1p1"); +#endif +} + +/******************************************************* + * Feature : FEAT_ECV (Enhanced Counter Virtualization) + ******************************************************/ +static void read_feat_ecv(void) +{ +#if (ENABLE_FEAT_ECV == FEAT_STATE_1) + unsigned int ecv = get_armv8_6_ecv_support(); + + feat_detect_panic(((ecv == ID_AA64MMFR0_EL1_ECV_SUPPORTED) || + (ecv == ID_AA64MMFR0_EL1_ECV_SELF_SYNCH)), "ECV"); +#endif +} + +/*********************************************************** + * Feature : FEAT_TWED (Delayed Trapping of WFE Instruction) + **********************************************************/ +static void read_feat_twed(void) +{ +#if (ENABLE_FEAT_TWED == FEAT_STATE_1) + feat_detect_panic(is_armv8_6_twed_present(), "TWED"); +#endif +} + +/****************************************************************** + * Feature : FEAT_HCX (Extended Hypervisor Configuration Register) + *****************************************************************/ +static void read_feat_hcx(void) +{ +#if (ENABLE_FEAT_HCX == FEAT_STATE_1) + feat_detect_panic(is_feat_hcx_present(), "HCX"); +#endif +} + +/************************************************** + * Feature : FEAT_RME (Realm Management Extension) + *************************************************/ +static void read_feat_rme(void) +{ +#if (ENABLE_RME == FEAT_STATE_1) + feat_detect_panic((get_armv9_2_feat_rme_support() != + ID_AA64PFR0_FEAT_RME_NOT_SUPPORTED), "RME"); +#endif +} + +/****************************************************** + * Feature : FEAT_BRBE (Branch Record Buffer Extension) + *****************************************************/ +static void read_feat_brbe(void) +{ +#if (ENABLE_BRBE_FOR_NS == FEAT_STATE_1) + feat_detect_panic(is_feat_brbe_present(), "BRBE"); +#endif +} + +/****************************************************** + * Feature : FEAT_TRBE (Trace Buffer Extension) + *****************************************************/ +static void read_feat_trbe(void) +{ +#if (ENABLE_TRBE_FOR_NS == FEAT_STATE_1) + feat_detect_panic(is_feat_trbe_present(), "TRBE"); +#endif +} + +/****************************************************************** + * Feature : FEAT_RNG_TRAP (Trapping support for RNDR/RNDRRS) + *****************************************************************/ +static void read_feat_rng_trap(void) +{ +#if (ENABLE_FEAT_RNG_TRAP == FEAT_STATE_1) + feat_detect_panic(is_feat_rng_trap_present(), "RNG_TRAP"); +#endif +} + +/*********************************************************************************** + * TF-A supports many Arm architectural features starting from arch version + * (8.0 till 8.7+). These features are mostly enabled through build flags. This + * mechanism helps in validating these build flags in the early boot phase + * either in BL1 or BL31 depending on the platform and assists in identifying + * and notifying the features which are enabled but not supported by the PE. + * + * It reads all the enabled features ID-registers and ensures the features + * are supported by the PE. + * In case if they aren't it stops booting at an early phase and logs the error + * messages, notifying the platforms about the features that are not supported. + * + * Further the procedure is implemented with a tri-state approach for each feature: + * ENABLE_FEAT_xxx = 0 : The feature is disabled statically at compile time + * ENABLE_FEAT_xxx = 1 : The feature is enabled and must be present in hardware. + * There will be panic if feature is not present at cold boot. + * ENABLE_FEAT_xxx = 2 : The feature is enabled but dynamically enabled at runtime + * depending on hardware capability. + * + * For better readability, state values are defined with macros namely: + * { FEAT_STATE_0, FEAT_STATE_1, FEAT_STATE_2 } taking values as their naming. + **********************************************************************************/ +void detect_arch_features(void) +{ + /* v8.0 features */ + read_feat_sb(); + read_feat_csv2_2(); + + /* v8.1 features */ + read_feat_pan(); + read_feat_vhe(); + + /* v8.2 features */ + read_feat_ras(); + + /* v8.3 features */ + read_feat_pauth(); + + /* v8.4 features */ + read_feat_dit(); + read_feat_amuv1(); + read_feat_mpam(); + read_feat_nv2(); + read_feat_sel2(); + read_feat_trf(); + + /* v8.5 features */ + read_feat_mte(); + read_feat_rng(); + read_feat_bti(); + read_feat_rng_trap(); + + /* v8.6 features */ + read_feat_amuv1p1(); + read_feat_fgt(); + read_feat_ecv(); + read_feat_twed(); + + /* v8.7 features */ + read_feat_hcx(); + + /* v9.0 features */ + read_feat_brbe(); + read_feat_trbe(); + + /* v9.2 features */ + read_feat_rme(); +} |