--- third_party/boringssl/src/crypto/cpu_aarch64_openbsd.c.orig	2022-03-25 21:59:56 UTC
+++ third_party/boringssl/src/crypto/cpu_aarch64_openbsd.c
@@ -0,0 +1,57 @@
+/* Copyright (c) 2022, Robert Nagy <robert@openbsd.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/cpu.h>
+
+#if defined(OPENSSL_AARCH64) && defined(OPENSSL_OPENBSD) && \
+    !defined(OPENSSL_STATIC_ARMCAP)
+
+#include <sys/sysctl.h>
+#include <machine/cpu.h>
+#include <machine/armreg.h>
+#include <stdio.h>
+
+#include <openssl/arm_arch.h>
+
+#include "internal.h"
+
+extern uint32_t OPENSSL_armcap_P;
+
+void OPENSSL_cpuid_setup(void) {
+  int isar0_mib[] = { CTL_MACHDEP, CPU_ID_AA64ISAR0 };
+  size_t len = sizeof(uint64_t);
+  uint64_t cpu_id = 0;
+
+  if (sysctl(isar0_mib, 2, &cpu_id, &len, NULL, 0) < 0)
+    return;
+
+  OPENSSL_armcap_P |= ARMV7_NEON;
+
+  if (ID_AA64ISAR0_AES(cpu_id) >= ID_AA64ISAR0_AES_BASE)
+    OPENSSL_armcap_P |= ARMV8_AES;
+
+  if (ID_AA64ISAR0_AES(cpu_id) >= ID_AA64ISAR0_AES_PMULL)
+    OPENSSL_armcap_P |= ARMV8_PMULL;
+
+  if (ID_AA64ISAR0_SHA1(cpu_id) >= ID_AA64ISAR0_SHA1_BASE)
+    OPENSSL_armcap_P |= ARMV8_SHA1;
+
+  if (ID_AA64ISAR0_SHA2(cpu_id) >= ID_AA64ISAR0_SHA2_BASE)
+    OPENSSL_armcap_P |= ARMV8_SHA256;
+
+  if (ID_AA64ISAR0_SHA2(cpu_id) >= ID_AA64ISAR0_SHA2_512)
+    OPENSSL_armcap_P |= ARMV8_SHA512;
+}
+
+#endif  // OPENSSL_AARCH64 && OPENSSL_OPENBSD && !OPENSSL_STATIC_ARMCAP