1 /*
2 * Copyright (c) 2017-2018, 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/errata_report.h>
15 #include <lib/el3_runtime/cpu_data.h>
16 #include <lib/spinlock.h>
17 #include <lib/utils.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(__arch64__) && defined(IMAGE_BL32)
24 # define BL_STRING "BL32"
25 #elif defined(IMAGE_BL2) && BL2_AT_EL3
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 /*
35 * Returns whether errata needs to be reported. Passed arguments are private to
36 * a CPU type.
37 */
errata_needs_reporting(spinlock_t * lock,uint32_t * reported)38 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported)
39 {
40 bool report_now;
41
42 /* If already reported, return false. */
43 if (*reported != 0U)
44 return 0;
45
46 /*
47 * Acquire lock. Determine whether status needs reporting, and then mark
48 * report status to true.
49 */
50 spin_lock(lock);
51 report_now = (*reported == 0U);
52 if (report_now)
53 *reported = 1;
54 spin_unlock(lock);
55
56 return report_now;
57 }
58
59 /*
60 * Print errata status message.
61 *
62 * Unknown: WARN
63 * Missing: WARN
64 * Applied: INFO
65 * Not applied: VERBOSE
66 */
errata_print_msg(unsigned int status,const char * cpu,const char * id)67 void errata_print_msg(unsigned int status, const char *cpu, const char *id)
68 {
69 /* Errata status strings */
70 static const char *const errata_status_str[] = {
71 [ERRATA_NOT_APPLIES] = "not applied",
72 [ERRATA_APPLIES] = "applied",
73 [ERRATA_MISSING] = "missing!"
74 };
75 static const char *const __unused bl_str = BL_STRING;
76 const char *msg __unused;
77
78
79 assert(status < ARRAY_SIZE(errata_status_str));
80 assert(cpu != NULL);
81 assert(id != NULL);
82
83 msg = errata_status_str[status];
84
85 switch (status) {
86 case ERRATA_NOT_APPLIES:
87 VERBOSE(ERRATA_FORMAT, bl_str, cpu, id, msg);
88 break;
89
90 case ERRATA_APPLIES:
91 INFO(ERRATA_FORMAT, bl_str, cpu, id, msg);
92 break;
93
94 case ERRATA_MISSING:
95 WARN(ERRATA_FORMAT, bl_str, cpu, id, msg);
96 break;
97
98 default:
99 WARN(ERRATA_FORMAT, bl_str, cpu, id, "unknown");
100 break;
101 }
102 }
103