Add cpu_aarch64_netbsd

Author: justsmth

crypto/fipsmodule/bcm.c

@@ -78,6 +78,7 @@
 #include "cpucap/cpu_aarch64_apple.c"
 #include "cpucap/cpu_aarch64_freebsd.c"
 #include "cpucap/cpu_aarch64_linux.c"
+#include "cpucap/cpu_aarch64_netbsd.c"
 #include "cpucap/cpu_aarch64_openbsd.c"
 #include "cpucap/cpu_aarch64_win.c"
 #include "cpucap/cpu_arm_freebsd.c"

crypto/fipsmodule/cpucap/cpu_aarch64_netbsd.c

@@ -0,0 +1,67 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR ISC
+
+#include <openssl/cpu.h>
+
+#if defined(OPENSSL_AARCH64) && defined(OPENSSL_NETBSD) && \
+    !defined(OPENSSL_STATIC_ARMCAP)
+
+#include <aarch64/armreg.h>
+#include <stdio.h>
+#include <sys/sysctl.h>
+
+#include <openssl/arm_arch.h>
+
+#include "internal.h"
+
+void OPENSSL_cpuid_setup(void) {
+  // Use sysctl to read ID_AA64ISAR0_EL1 register
+  size_t len = sizeof(uint64_t);
+  uint64_t id_aa64isar0 = 0;
+
+  // Try to read the aarch64 instruction set attribute register
+  if (sysctlbyname("machdep.id_aa64isar0", &id_aa64isar0, &len, NULL, 0) < 0) {
+    return;
+  }
+
+  OPENSSL_armcap_P |= ARMV7_NEON;
+
+
+  /*
+   * The extractor macro ID_AA64ISAR0_EL1_AES(reg) gets the field value.
+   * The constants for comparison are:
+   * - ID_AA64ISAR0_EL1_AES (value 1, base AES)
+   * - ID_AA64ISAR0_EL1_AES_PMUL (value 2, AES + PMULL)
+   */
+  if (ID_AA64ISAR0_EL1_AES(id_aa64isar0) >= ID_AA64ISAR0_EL1_AES) {
+    OPENSSL_armcap_P |= ARMV8_AES;
+  }
+
+  if (ID_AA64ISAR0_EL1_AES(id_aa64isar0) >= ID_AA64ISAR0_EL1_AES_PMUL) {
+    OPENSSL_armcap_P |= ARMV8_PMULL;
+  }
+
+  /*
+   * The extractor is ID_AA64ISAR0_EL1_SHA1(reg).
+   * The constant for base support is ID_AA64ISAR0_EL1_SHA1 (value 1).
+   */
+  if (ID_AA64ISAR0_EL1_SHA1(id_aa64isar0) >= ID_AA64ISAR0_EL1_SHA1) {
+    OPENSSL_armcap_P |= ARMV8_SHA1;
+  }
+
+  /*
+   * The extractor is ID_AA64ISAR0_EL1_SHA2(reg).
+   * The constants for comparison are:
+   * - ID_AA64ISAR0_EL1_SHA2 (value 1, SHA256)
+   * - ID_AA64ISAR0_EL1_SHA512 (value 2, SHA256 + SHA512)
+   */
+  if (ID_AA64ISAR0_EL1_SHA2(id_aa64isar0) >= ID_AA64ISAR0_EL1_SHA2) {
+    OPENSSL_armcap_P |= ARMV8_SHA256;
+  }
+
+  if (ID_AA64ISAR0_EL1_SHA2(id_aa64isar0) >= ID_AA64ISAR0_EL1_SHA512) {
+    OPENSSL_armcap_P |= ARMV8_SHA512;
+  }
+}
+
+#endif  // OPENSSL_AARCH64 && OPENSSL_NETBSD && !OPENSSL_STATIC_ARMCAP