1 files changed, 75 insertions, 0 deletions
diff --git a/lib/raid6/x86.h b/lib/raid6/x86.h
new file mode 100644
index 0000000000..9a6ff37115
--- /dev/null
+++ b/lib/raid6/x86.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * raid6/x86.h
+ *
+ * Definitions common to x86 and x86-64 RAID-6 code only
+ */
+
+#ifndef LINUX_RAID_RAID6X86_H
+#define LINUX_RAID_RAID6X86_H
+
+#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
+
+#ifdef __KERNEL__ /* Real code */
+
+#include <asm/fpu/api.h>
+
+#else /* Dummy code for user space testing */
+
+static inline void kernel_fpu_begin(void)
+{
+}
+
+static inline void kernel_fpu_end(void)
+{
+}
+
+#define __aligned(x) __attribute__((aligned(x)))
+
+#define X86_FEATURE_MMX		(0*32+23) /* Multimedia Extensions */
+#define X86_FEATURE_FXSR	(0*32+24) /* FXSAVE and FXRSTOR instructions
+					   * (fast save and restore) */
+#define X86_FEATURE_XMM		(0*32+25) /* Streaming SIMD Extensions */
+#define X86_FEATURE_XMM2	(0*32+26) /* Streaming SIMD Extensions-2 */
+#define X86_FEATURE_XMM3	(4*32+ 0) /* "pni" SSE-3 */
+#define X86_FEATURE_SSSE3	(4*32+ 9) /* Supplemental SSE-3 */
+#define X86_FEATURE_AVX	(4*32+28) /* Advanced Vector Extensions */
+#define X86_FEATURE_AVX2        (9*32+ 5) /* AVX2 instructions */
+#define X86_FEATURE_AVX512F     (9*32+16) /* AVX-512 Foundation */
+#define X86_FEATURE_AVX512DQ    (9*32+17) /* AVX-512 DQ (Double/Quad granular)
+					   * Instructions
+					   */
+#define X86_FEATURE_AVX512BW    (9*32+30) /* AVX-512 BW (Byte/Word granular)
+					   * Instructions
+					   */
+#define X86_FEATURE_AVX512VL    (9*32+31) /* AVX-512 VL (128/256 Vector Length)
+					   * Extensions
+					   */
+#define X86_FEATURE_MMXEXT	(1*32+22) /* AMD MMX extensions */
+
+/* Should work well enough on modern CPUs for testing */
+static inline int boot_cpu_has(int flag)
+{
+	u32 eax, ebx, ecx, edx;
+
+	eax = (flag & 0x100) ? 7 :
+		(flag & 0x20) ? 0x80000001 : 1;
+	ecx = 0;
+
+	asm volatile("cpuid"
+		     : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
+
+	return ((flag & 0x100 ? ebx :
+		(flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
+}
+
+#endif /* ndef __KERNEL__ */
+
+#endif
+#endif