summaryrefslogtreecommitdiffstats
path: root/lib/cpus/errata_report.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/cpus/errata_report.c')
-rw-r--r--lib/cpus/errata_report.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/lib/cpus/errata_report.c b/lib/cpus/errata_report.c
new file mode 100644
index 0000000..93b2744
--- /dev/null
+++ b/lib/cpus/errata_report.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* Runtime firmware routines to report errata status for the current CPU. */
+
+#include <assert.h>
+#include <stdbool.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <lib/cpus/errata_report.h>
+#include <lib/el3_runtime/cpu_data.h>
+#include <lib/spinlock.h>
+
+#ifdef IMAGE_BL1
+# define BL_STRING "BL1"
+#elif defined(__aarch64__) && defined(IMAGE_BL31)
+# define BL_STRING "BL31"
+#elif !defined(__aarch64__) && defined(IMAGE_BL32)
+# define BL_STRING "BL32"
+#elif defined(IMAGE_BL2) && BL2_AT_EL3
+# define BL_STRING "BL2"
+#else
+# error This image should not be printing errata status
+#endif
+
+/* Errata format: BL stage, CPU, errata ID, message */
+#define ERRATA_FORMAT "%s: %s: CPU workaround for %s was %s\n"
+
+/*
+ * Returns whether errata needs to be reported. Passed arguments are private to
+ * a CPU type.
+ */
+int errata_needs_reporting(spinlock_t *lock, uint32_t *reported)
+{
+ bool report_now;
+
+ /* If already reported, return false. */
+ if (*reported != 0U)
+ return 0;
+
+ /*
+ * Acquire lock. Determine whether status needs reporting, and then mark
+ * report status to true.
+ */
+ spin_lock(lock);
+ report_now = (*reported == 0U);
+ if (report_now)
+ *reported = 1;
+ spin_unlock(lock);
+
+ return report_now;
+}
+
+/*
+ * Print errata status message.
+ *
+ * Unknown: WARN
+ * Missing: WARN
+ * Applied: INFO
+ * Not applied: VERBOSE
+ */
+void errata_print_msg(unsigned int status, const char *cpu, const char *id)
+{
+ /* Errata status strings */
+ static const char *const errata_status_str[] = {
+ [ERRATA_NOT_APPLIES] = "not applied",
+ [ERRATA_APPLIES] = "applied",
+ [ERRATA_MISSING] = "missing!"
+ };
+ static const char *const __unused bl_str = BL_STRING;
+ const char *msg __unused;
+
+
+ assert(status < ARRAY_SIZE(errata_status_str));
+ assert(cpu != NULL);
+ assert(id != NULL);
+
+ msg = errata_status_str[status];
+
+ switch (status) {
+ case ERRATA_NOT_APPLIES:
+ VERBOSE(ERRATA_FORMAT, bl_str, cpu, id, msg);
+ break;
+
+ case ERRATA_APPLIES:
+ INFO(ERRATA_FORMAT, bl_str, cpu, id, msg);
+ break;
+
+ case ERRATA_MISSING:
+ WARN(ERRATA_FORMAT, bl_str, cpu, id, msg);
+ break;
+
+ default:
+ WARN(ERRATA_FORMAT, bl_str, cpu, id, "unknown");
+ break;
+ }
+}