1 /* 2 * Copyright (c) 2017-2025, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 /* Runtime firmware routines to report errata status for the current CPU. */ 8 9 #include <assert.h> 10 #include <stdbool.h> 11 12 #include <arch_helpers.h> 13 #include <common/debug.h> 14 #include <lib/cpus/cpu_ops.h> 15 #include <lib/cpus/errata.h> 16 #include <lib/el3_runtime/cpu_data.h> 17 #include <lib/spinlock.h> 18 19 #ifdef IMAGE_BL1 20 # define BL_STRING "BL1" 21 #elif defined(__aarch64__) && defined(IMAGE_BL31) 22 # define BL_STRING "BL31" 23 #elif !defined(__aarch64__) && defined(IMAGE_BL32) 24 # define BL_STRING "BL32" 25 #elif defined(IMAGE_BL2) && RESET_TO_BL2 26 # define BL_STRING "BL2" 27 #else 28 # error This image should not be printing errata status 29 #endif 30 31 /* Errata format: BL stage, CPU, errata ID, message */ 32 #define ERRATA_FORMAT "%s: %s: CPU workaround for %s was %s\n" 33 34 #define CVE_FORMAT "%s: %s: CPU workaround for CVE %u_%04u was %s\n" 35 #define ERRATUM_FORMAT "%s: %s: CPU workaround for erratum %u was %s\n" 36 37 38 static __unused void print_status(int status, char *cpu_str, uint16_t cve, uint32_t id) 39 { 40 if (status == ERRATA_MISSING) { 41 if (cve) { 42 WARN(CVE_FORMAT, BL_STRING, cpu_str, cve, id, "missing!"); 43 } else { 44 WARN(ERRATUM_FORMAT, BL_STRING, cpu_str, id, "missing!"); 45 } 46 } else if (status == ERRATA_APPLIES) { 47 if (cve) { 48 INFO(CVE_FORMAT, BL_STRING, cpu_str, cve, id, "applied"); 49 } else { 50 INFO(ERRATUM_FORMAT, BL_STRING, cpu_str, id, "applied"); 51 } 52 } else { 53 if (cve) { 54 VERBOSE(CVE_FORMAT, BL_STRING, cpu_str, cve, id, "not applicable"); 55 } else { 56 VERBOSE(ERRATUM_FORMAT, BL_STRING, cpu_str, id, "not applicable"); 57 } 58 } 59 } 60 61 #if !REPORT_ERRATA 62 void print_errata_status(void) {} 63 #else /* !REPORT_ERRATA */ 64 /* 65 * New errata status message printer 66 */ 67 static void generic_errata_report(struct cpu_ops *cpu_ops) 68 { 69 struct erratum_entry *entry = cpu_ops->errata_list_start; 70 struct erratum_entry *end = cpu_ops->errata_list_end; 71 long rev_var = cpu_get_rev_var(); 72 73 for (; entry != end; entry += 1) { 74 uint64_t status = entry->check_func(rev_var); 75 76 assert(entry->id != 0); 77 78 /* 79 * Errata workaround has not been compiled in. If the errata 80 * would have applied had it been compiled in, print its status 81 * as missing. 82 */ 83 if (status == ERRATA_APPLIES && entry->chosen == 0) { 84 status = ERRATA_MISSING; 85 } 86 87 print_status(status, cpu_ops->cpu_str, entry->cve, entry->id); 88 } 89 } 90 91 /* 92 * Function to print errata status for the calling CPU (and others of the same 93 * type). Must be called only: 94 * - when MMU and data caches are enabled; 95 * - after cpu_ops have been initialized in per-CPU data. 96 */ 97 void print_errata_status(void) 98 { 99 #if IMAGE_BL1 100 struct cpu_ops *cpu_ops = get_cpu_ops_ptr(); 101 #else 102 struct cpu_ops *cpu_ops = get_cpu_data(cpu_ops_ptr); 103 #endif 104 105 assert(cpu_ops != NULL); 106 107 #if !IMAGE_BL1 108 /* 109 * Try to acquire the lock. The first CPU of each type to do so will 110 * report errata. The others need not do anything. Never release the 111 * lock as there are no other users. 112 */ 113 if (!spin_trylock(cpu_ops->errata_reported)) { 114 return; 115 } 116 #endif 117 118 generic_errata_report(cpu_ops); 119 } 120 #endif /* !REPORT_ERRATA */ 121