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arm-trusted-firmware/common/feat_detect.c
Andre Przywara b45dd74e3a refactor(cpufeat): check FEAT_FGT in a new way 
To implement proper runtime checking of features, and to be able to
extend feat_detect.c to catch other cases, rework the FEAT_FGT check to
directly call a generic function instead of providing a trivial specific
one. The #ifdef is moved into the function, and rewritten as a proper C
if statement.
We need to force the compiler to inline that function, otherwise the
optimisation won't work, once we exceed a certain number of callers.

This starts with FEAT_FGT, but all the other features will be moved over
eventually, in separate patches.

For all features checked this way, we delay the panic() until after
every feature has been checked, to list them all during one run.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Change-Id: Ic576922ff2c4f8d3c1b87b5843b3626729fe4514
2023-01-11 16:02:58 +00:00

366 lines
12 KiB
C
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/*
* Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch_features.h>
#include <common/debug.h>
#include <common/feat_detect.h>
static bool tainted;
/*******************************************************************************
* This section lists the wrapper modules for each feature to evaluate the
* feature states (FEAT_STATE_ALWAYS and FEAT_STATE_CHECK) 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.
******************************************************************************/
#define feat_detect_panic(a, b) ((a) ? (void)0 : feature_panic(b))
/*******************************************************************************
* Function : feature_panic
* Customised panic function with error logging mechanism to list the feature
* not supported by the PE.
******************************************************************************/
static inline void feature_panic(char *feat_name)
{
ERROR("FEAT_%s not supported by the PE\n", feat_name);
panic();
}
/*******************************************************************************
* Function : check_feature
* Check for a valid combination of build time flags (ENABLE_FEAT_xxx) and
* feature availability on the hardware.
* Panics if a feature is forcefully enabled, but not available on the PE.
*
* We force inlining here to let the compiler optimise away the whole check
* if the feature is disabled at build time (FEAT_STATE_DISABLED).
******************************************************************************/
static inline void __attribute((__always_inline__))
check_feature(int state, unsigned long field, const char *feat_name)
{
if (state == FEAT_STATE_ALWAYS && field == 0U) {
ERROR("FEAT_%s not supported by the PE\n", feat_name);
tainted = true;
}
}
/******************************************
* Feature : FEAT_SB (Speculation Barrier)
*****************************************/
static void read_feat_sb(void)
{
#if (ENABLE_FEAT_SB == FEAT_STATE_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS) || (CTX_INCLUDE_PAUTH_REGS == FEAT_STATE_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
feat_detect_panic(is_armv8_5_bti_present(), "BTI");
#endif
}
/***********************************************
* Feature : FEAT_AMUv1p1 (AMU Extensions v1.1)
**********************************************/
static void read_feat_amuv1p1(void)
{
#if (ENABLE_FEAT_AMUv1p1 == FEAT_STATE_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_ALWAYS)
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_DISABLED, FEAT_STATE_ALWAYS, FEAT_STATE_CHECK }, taking values
* { 0, 1, 2 }, respectively, as their naming.
**********************************************************************************/
void detect_arch_features(void)
{
tainted = false;
/* 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();
check_feature(ENABLE_FEAT_FGT, is_armv8_6_fgt_present(), "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();
if (tainted) {
panic();
}
}
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