1 files changed, 87 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/include/os/linux/kernel/linux/simd_arm.h b/sys/contrib/openzfs/include/os/linux/kernel/linux/simd_arm.h
new file mode 100644
index 000000000000..c06588b5dced
--- /dev/null
+++ b/sys/contrib/openzfs/include/os/linux/kernel/linux/simd_arm.h
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
+ */
+
+/*
+ * USER API:
+ *
+ * Kernel fpu methods:
+ *	kfpu_allowed()
+ *	kfpu_begin()
+ *	kfpu_end()
+ *	kfpu_init()
+ *	kfpu_fini()
+ *
+ * SIMD support:
+ *
+ * Following functions should be called to determine whether CPU feature
+ * is supported. All functions are usable in kernel and user space.
+ * If a SIMD algorithm is using more than one instruction set
+ * all relevant feature test functions should be called.
+ *
+ * Supported features:
+ *   zfs_neon_available()
+ *   zfs_sha256_available()
+ */
+
+#ifndef _LINUX_SIMD_ARM_H
+#define	_LINUX_SIMD_ARM_H
+
+#include <sys/types.h>
+#include <asm/neon.h>
+#include <asm/elf.h>
+#include <asm/hwcap.h>
+
+#if (defined(HAVE_KERNEL_NEON) && defined(CONFIG_KERNEL_MODE_NEON))
+#define	kfpu_allowed()		1
+#define	kfpu_begin()		kernel_neon_begin()
+#define	kfpu_end()		kernel_neon_end()
+#else
+#define	kfpu_allowed()		0
+#define	kfpu_begin()		do {} while (0)
+#define	kfpu_end()		do {} while (0)
+#endif
+#define	kfpu_init()		(0)
+#define	kfpu_fini()		do {} while (0)
+
+/*
+ * Check if NEON is available
+ */
+static inline boolean_t
+zfs_neon_available(void)
+{
+	return (elf_hwcap & HWCAP_NEON);
+}
+
+/*
+ * Check if SHA256 is available
+ */
+static inline boolean_t
+zfs_sha256_available(void)
+{
+	return (elf_hwcap2 & HWCAP2_SHA2);
+}
+
+#endif /* _LINUX_SIMD_ARM_H */