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Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +00001/*
2 * Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
Andre Przywara5b005112022-11-14 15:38:58 +00007#include <arch_features.h>
8#include <common/debug.h>
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +00009#include <common/feat_detect.h>
10
Andre Przywaracc4118d2022-11-14 15:42:44 +000011static bool tainted;
12
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000013/*******************************************************************************
14 * This section lists the wrapper modules for each feature to evaluate the
Andre Przywara5b005112022-11-14 15:38:58 +000015 * feature states (FEAT_STATE_ALWAYS and FEAT_STATE_CHECK) and perform
16 * necessary action as below:
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000017 *
18 * It verifies whether the FEAT_XXX (eg: FEAT_SB) is supported by the PE or not.
19 * Without this check an exception would occur during context save/restore
20 * routines, if the feature is enabled but not supported by PE.
21 ******************************************************************************/
22
Andre Przywara5b005112022-11-14 15:38:58 +000023#define feat_detect_panic(a, b) ((a) ? (void)0 : feature_panic(b))
24
25/*******************************************************************************
26 * Function : feature_panic
27 * Customised panic function with error logging mechanism to list the feature
28 * not supported by the PE.
29 ******************************************************************************/
30static inline void feature_panic(char *feat_name)
31{
32 ERROR("FEAT_%s not supported by the PE\n", feat_name);
33 panic();
34}
35
Andre Przywaracc4118d2022-11-14 15:42:44 +000036/*******************************************************************************
37 * Function : check_feature
38 * Check for a valid combination of build time flags (ENABLE_FEAT_xxx) and
Andre Przywara2f3e79a2023-02-01 11:46:31 +000039 * feature availability on the hardware. <min> is the smallest feature
40 * ID field value that is required for that feature.
41 * Triggers a panic later if a feature is forcefully enabled, but not
42 * available on the PE. Also will panic if the hardware feature ID field
43 * is larger than the maximum known and supported number, specified by <max>.
Andre Przywaracc4118d2022-11-14 15:42:44 +000044 *
45 * We force inlining here to let the compiler optimise away the whole check
46 * if the feature is disabled at build time (FEAT_STATE_DISABLED).
47 ******************************************************************************/
48static inline void __attribute((__always_inline__))
Andre Przywara2f3e79a2023-02-01 11:46:31 +000049check_feature(int state, unsigned long field, const char *feat_name,
50 unsigned int min, unsigned int max)
Andre Przywaracc4118d2022-11-14 15:42:44 +000051{
Andre Przywara2f3e79a2023-02-01 11:46:31 +000052 if (state == FEAT_STATE_ALWAYS && field < min) {
Andre Przywaracc4118d2022-11-14 15:42:44 +000053 ERROR("FEAT_%s not supported by the PE\n", feat_name);
54 tainted = true;
55 }
Andre Przywara2f3e79a2023-02-01 11:46:31 +000056 if (state >= FEAT_STATE_ALWAYS && field > max) {
57 ERROR("FEAT_%s is version %ld, but is only known up to version %d\n",
58 feat_name, field, max);
59 tainted = true;
60 }
Andre Przywaracc4118d2022-11-14 15:42:44 +000061}
62
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000063/*******************************************************************************
64 * Feature : FEAT_RAS (Reliability, Availability, and Serviceability Extension)
65 ******************************************************************************/
66static void read_feat_ras(void)
67{
Andre Przywara5b005112022-11-14 15:38:58 +000068#if (RAS_EXTENSION == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000069 feat_detect_panic(is_armv8_2_feat_ras_present(), "RAS");
70#endif
71}
72
73/************************************************
74 * Feature : FEAT_PAUTH (Pointer Authentication)
75 ***********************************************/
76static void read_feat_pauth(void)
77{
Andre Przywara5b005112022-11-14 15:38:58 +000078#if (ENABLE_PAUTH == FEAT_STATE_ALWAYS) || (CTX_INCLUDE_PAUTH_REGS == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000079 feat_detect_panic(is_armv8_3_pauth_present(), "PAUTH");
80#endif
81}
82
83/************************************************************
84 * Feature : FEAT_DIT (Data Independent Timing Instructions)
85 ***********************************************************/
86static void read_feat_dit(void)
87{
Andre Przywara5b005112022-11-14 15:38:58 +000088#if (ENABLE_FEAT_DIT == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000089 feat_detect_panic(is_armv8_4_feat_dit_present(), "DIT");
90#endif
91}
92
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000093/************************************************
94 * Feature : FEAT_MTE (Memory Tagging Extension)
95 ***********************************************/
96static void read_feat_mte(void)
97{
Andre Przywara5b005112022-11-14 15:38:58 +000098#if (CTX_INCLUDE_MTE_REGS == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +000099 unsigned int mte = get_armv8_5_mte_support();
100
101 feat_detect_panic((mte != MTE_UNIMPLEMENTED), "MTE");
102#endif
103}
104
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000105/****************************************************
106 * Feature : FEAT_BTI (Branch Target Identification)
107 ***************************************************/
108static void read_feat_bti(void)
109{
Andre Przywara5b005112022-11-14 15:38:58 +0000110#if (ENABLE_BTI == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000111 feat_detect_panic(is_armv8_5_bti_present(), "BTI");
112#endif
113}
114
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000115/***********************************************
116 * Feature : FEAT_AMUv1p1 (AMU Extensions v1.1)
117 **********************************************/
118static void read_feat_amuv1p1(void)
119{
Andre Przywara5b005112022-11-14 15:38:58 +0000120#if (ENABLE_FEAT_AMUv1p1 == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000121 feat_detect_panic(is_armv8_6_feat_amuv1p1_present(), "AMUv1p1");
122#endif
123}
124
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000125/**************************************************
126 * Feature : FEAT_RME (Realm Management Extension)
127 *************************************************/
128static void read_feat_rme(void)
129{
Andre Przywara5b005112022-11-14 15:38:58 +0000130#if (ENABLE_RME == FEAT_STATE_ALWAYS)
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000131 feat_detect_panic((get_armv9_2_feat_rme_support() !=
132 ID_AA64PFR0_FEAT_RME_NOT_SUPPORTED), "RME");
133#endif
134}
135
Juan Pablo Conde42305f22022-07-12 16:40:29 -0400136/******************************************************************
137 * Feature : FEAT_RNG_TRAP (Trapping support for RNDR/RNDRRS)
138 *****************************************************************/
139static void read_feat_rng_trap(void)
140{
Andre Przywara5b005112022-11-14 15:38:58 +0000141#if (ENABLE_FEAT_RNG_TRAP == FEAT_STATE_ALWAYS)
Juan Pablo Conde42305f22022-07-12 16:40:29 -0400142 feat_detect_panic(is_feat_rng_trap_present(), "RNG_TRAP");
143#endif
144}
145
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000146/***********************************************************************************
147 * TF-A supports many Arm architectural features starting from arch version
148 * (8.0 till 8.7+). These features are mostly enabled through build flags. This
149 * mechanism helps in validating these build flags in the early boot phase
150 * either in BL1 or BL31 depending on the platform and assists in identifying
151 * and notifying the features which are enabled but not supported by the PE.
152 *
153 * It reads all the enabled features ID-registers and ensures the features
154 * are supported by the PE.
155 * In case if they aren't it stops booting at an early phase and logs the error
156 * messages, notifying the platforms about the features that are not supported.
157 *
158 * Further the procedure is implemented with a tri-state approach for each feature:
159 * ENABLE_FEAT_xxx = 0 : The feature is disabled statically at compile time
160 * ENABLE_FEAT_xxx = 1 : The feature is enabled and must be present in hardware.
161 * There will be panic if feature is not present at cold boot.
162 * ENABLE_FEAT_xxx = 2 : The feature is enabled but dynamically enabled at runtime
163 * depending on hardware capability.
164 *
Andre Przywara5b005112022-11-14 15:38:58 +0000165 * For better readability, state values are defined with macros, namely:
166 * { FEAT_STATE_DISABLED, FEAT_STATE_ALWAYS, FEAT_STATE_CHECK }, taking values
167 * { 0, 1, 2 }, respectively, as their naming.
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000168 **********************************************************************************/
169void detect_arch_features(void)
170{
Andre Przywaracc4118d2022-11-14 15:42:44 +0000171 tainted = false;
172
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000173 /* v8.0 features */
Andre Przywara46880dc2022-11-17 16:42:09 +0000174 check_feature(ENABLE_FEAT_SB, read_feat_sb_id_field(), "SB", 1, 1);
Andre Przywara902c9022022-11-17 17:30:43 +0000175 check_feature(ENABLE_FEAT_CSV2_2, read_feat_csv2_id_field(),
176 "CSV2_2", 2, 3);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000177
178 /* v8.1 features */
Andre Przywara97272942023-01-26 15:27:38 +0000179 check_feature(ENABLE_FEAT_PAN, read_feat_pan_id_field(), "PAN", 1, 3);
Andre Przywara98908b32022-11-17 16:42:09 +0000180 check_feature(ENABLE_FEAT_VHE, read_feat_vhe_id_field(), "VHE", 1, 1);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000181
182 /* v8.2 features */
183 read_feat_ras();
184
185 /* v8.3 features */
186 read_feat_pauth();
187
188 /* v8.4 features */
189 read_feat_dit();
Andre Przywara2f3e79a2023-02-01 11:46:31 +0000190 check_feature(ENABLE_FEAT_AMUv1, read_feat_amu_id_field(),
191 "AMUv1", 1, 2);
Andre Przywara84b86532022-11-17 16:42:09 +0000192 check_feature(ENABLE_MPAM_FOR_LOWER_ELS, read_feat_mpam_version(),
Andre Przywaraa96d4502023-03-21 14:44:59 +0000193 "MPAM", 1, 17);
Andre Przywaraedc449d2023-01-27 14:09:20 +0000194 check_feature(CTX_INCLUDE_NEVE_REGS, read_feat_nv_id_field(),
195 "NV2", 2, 2);
Andre Przywara6dd2d062023-02-22 16:53:50 +0000196 check_feature(ENABLE_FEAT_SEL2, read_feat_sel2_id_field(),
197 "SEL2", 1, 1);
Andre Przywara06ea44e2022-11-17 17:30:43 +0000198 check_feature(ENABLE_TRF_FOR_NS, read_feat_trf_id_field(),
199 "TRF", 1, 1);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000200
201 /* v8.5 features */
202 read_feat_mte();
Andre Przywara436b4bb2023-02-22 17:55:59 +0000203 check_feature(ENABLE_FEAT_RNG, read_feat_rng_id_field(), "RNG", 1, 1);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000204 read_feat_bti();
Juan Pablo Conde42305f22022-07-12 16:40:29 -0400205 read_feat_rng_trap();
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000206
207 /* v8.6 features */
208 read_feat_amuv1p1();
Andre Przywara2f3e79a2023-02-01 11:46:31 +0000209 check_feature(ENABLE_FEAT_FGT, read_feat_fgt_id_field(), "FGT", 1, 1);
Andre Przywarac3464182022-11-17 17:30:43 +0000210 check_feature(ENABLE_FEAT_ECV, read_feat_ecv_id_field(), "ECV", 1, 2);
Andre Przywara0cf77402023-01-27 12:25:49 +0000211 check_feature(ENABLE_FEAT_TWED, read_feat_twed_id_field(),
212 "TWED", 1, 1);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000213
214 /* v8.7 features */
Andre Przywara2f3e79a2023-02-01 11:46:31 +0000215 check_feature(ENABLE_FEAT_HCX, read_feat_hcx_id_field(), "HCX", 1, 1);
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000216
Mark Brownc37eee72023-03-14 20:13:03 +0000217 /* v8.9 features */
218 check_feature(ENABLE_FEAT_TCR2, read_feat_tcrx_id_field(),
219 "TCR2", 1, 1);
220
Jayanth Dodderi Chidanand69316752022-05-09 12:33:03 +0100221 /* v9.0 features */
Andre Przywarac97c5512022-11-17 16:42:09 +0000222 check_feature(ENABLE_BRBE_FOR_NS, read_feat_brbe_id_field(),
223 "BRBE", 1, 2);
Andre Przywara191eff62022-11-17 16:42:09 +0000224 check_feature(ENABLE_TRBE_FOR_NS, read_feat_trbe_id_field(),
225 "TRBE", 1, 1);
Jayanth Dodderi Chidanand69316752022-05-09 12:33:03 +0100226
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000227 /* v9.2 features */
228 read_feat_rme();
Andre Przywaracc4118d2022-11-14 15:42:44 +0000229
230 if (tainted) {
231 panic();
232 }
Jayanth Dodderi Chidanand9461a892022-01-17 18:57:17 +0000233}