1 files changed, 62 insertions, 0 deletions

diff --git a/crypto/arch/aarch64/crypto_cpu_caps_linux.c b/crypto/arch/aarch64/crypto_cpu_caps_linux.c
new file mode 100644
index 0000000..ae28120
--- /dev/null
+++ b/crypto/arch/aarch64/crypto_cpu_caps_linux.c
@@ -0,0 +1,62 @@
+/* $OpenBSD: crypto_cpu_caps.c,v 1.2 2024/11/12 13:52:31 jsing Exp $ */
+/*
+ * Copyright (c) 2025 Brent Cook <bcook@openbsd.org>
+ *
+ * Permission to use, copy, modify, and 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 <sys/auxv.h>
+
+/* from arch/arm64/include/uapi/asm/hwcap.h */
+#define HWCAP_AES       (1 << 3)
+#define HWCAP_PMULL     (1 << 4)
+#define HWCAP_SHA1      (1 << 5)
+#define HWCAP_SHA2      (1 << 6)
+#define HWCAP_CRC32     (1 << 7)
+#define HWCAP_SHA3      (1 << 17)
+#define HWCAP_SHA512    (1 << 21)
+
+#include "crypto_arch.h"
+
+/* Machine dependent CPU capabilities. */
+uint64_t crypto_cpu_caps_aarch64;
+
+static uint64_t
+check_cpu_cap(unsigned long hwcap, uint64_t cap_flag)
+{
+        return (getauxval(AT_HWCAP) & hwcap) ? cap_flag : 0;
+}
+
+void
+crypto_cpu_caps_init(void)
+{
+        crypto_cpu_caps_aarch64 = 0;
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_AES,
+                CRYPTO_CPU_CAPS_AARCH64_AES);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_PMULL,
+                CRYPTO_CPU_CAPS_AARCH64_PMULL);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_SHA1,
+                CRYPTO_CPU_CAPS_AARCH64_SHA1);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_SHA2,
+                CRYPTO_CPU_CAPS_AARCH64_SHA2);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_SHA512,
+                CRYPTO_CPU_CAPS_AARCH64_SHA512);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap(HWCAP_SHA3,
+                CRYPTO_CPU_CAPS_AARCH64_SHA3);
+}