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diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -421,6 +421,7 @@
dev/psci/psci.c standard
dev/psci/smccc_arm64.S standard
+dev/psci/smccc_errata.c standard
dev/psci/smccc_trng.c standard
dev/psci/smccc.c standard
diff --git a/sys/dev/psci/smccc_errata.c b/sys/dev/psci/smccc_errata.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/psci/smccc_errata.c
@@ -0,0 +1,138 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Arm Ltd
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * A driver for the Arm Errata Management Firmware Interface (Errata ABI).
+ * This queries into the SMCCC firmware for the status of errata using the
+ * interface documented in den0100 [1].
+ *
+ * [1] https://developer.arm.com/documentation/den0100/latest
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/random.h>
+
+#include <dev/psci/psci.h>
+#include <dev/psci/smccc.h>
+
+#include <machine/cpu_feat.h>
+
+#define ERRATA_HIGHER_EL_MITIGATION 3
+#define ERRATA_NOT_AFFECTED 2
+#define ERRATA_AFFECTED 1
+
+#define EM_VERSION SMCCC_FUNC_ID(SMCCC_FAST_CALL, \
+ SMCCC_32BIT_CALL, SMCCC_STD_SECURE_SERVICE_CALLS, 0xf0u)
+#define EM_VERSION_MIN 0x10000L
+#define EM_FEATURES SMCCC_FUNC_ID(SMCCC_FAST_CALL, \
+ SMCCC_32BIT_CALL, SMCCC_STD_SECURE_SERVICE_CALLS, 0xf1u)
+#define EM_CPU_ERRATUM_FEATURES SMCCC_FUNC_ID(SMCCC_FAST_CALL, \
+ SMCCC_32BIT_CALL, SMCCC_STD_SECURE_SERVICE_CALLS, 0xf2u)
+
+static device_identify_t errata_identify;
+static device_probe_t errata_probe;
+static device_attach_t errata_attach;
+static cpu_feat_errata errata_cpu_feat_errata_check(const struct cpu_feat *,
+ u_int);
+
+static void
+errata_identify(driver_t *driver, device_t parent)
+{
+ int32_t version;
+
+ if (smccc_get_version() < SMCCC_MAKE_VERSION(1, 1))
+ return;
+
+ /* Check we have Errata 1.0 or later */
+ version = psci_call(EM_VERSION, 0, 0, 0);
+ if (version < EM_VERSION_MIN)
+ return;
+
+ if (BUS_ADD_CHILD(parent, 0, "errata", -1) == NULL)
+ device_printf(parent, "add errata child failed\n");
+}
+
+static int
+errata_probe(device_t dev)
+{
+ device_set_desc(dev, "Arm SMCCC Errata Management");
+ return (BUS_PROBE_NOWILDCARD);
+}
+
+static int
+errata_attach(device_t dev)
+{
+ /* Check for EM_CPU_ERRATUM_FEATURES. It's mandatory, so should exist */
+ if (arm_smccc_invoke(EM_FEATURES, EM_CPU_ERRATUM_FEATURES, NULL) < 0) {
+ device_printf(dev,
+ "EM_CPU_ERRATUM_FEATURES is not implemented\n");
+ return (ENXIO);
+ }
+
+ cpu_feat_register_errata_check(errata_cpu_feat_errata_check);
+
+ return (0);
+}
+
+static cpu_feat_errata
+errata_cpu_feat_errata_check(const struct cpu_feat *feat __unused, u_int errata_id)
+{
+ struct arm_smccc_res res;
+
+ switch(arm_smccc_invoke(EM_CPU_ERRATUM_FEATURES, errata_id, 0, &res)) {
+ default:
+ return (ERRATA_UNKNOWN);
+ case ERRATA_NOT_AFFECTED:
+ return (ERRATA_NONE);
+ case ERRATA_AFFECTED:
+ return (ERRATA_AFFECTED);
+ case ERRATA_HIGHER_EL_MITIGATION:
+ return (ERRATA_FW_MITIGAION);
+ }
+}
+
+static device_method_t errata_methods[] = {
+ DEVMETHOD(device_identify, errata_identify),
+ DEVMETHOD(device_probe, errata_probe),
+ DEVMETHOD(device_attach, errata_attach),
+
+ DEVMETHOD_END
+};
+
+static driver_t errata_driver = {
+ "errata",
+ errata_methods,
+ 0
+};
+
+DRIVER_MODULE(errata, smccc, errata_driver, 0, 0);

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