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authorNeilBrown <neilb@suse.de>2010-08-11 20:44:54 (GMT)
committerNeilBrown <neilb@suse.de>2010-08-11 20:44:54 (GMT)
commita8e026c785b3fecef0ef5c00c15223542c4db8f5 (patch)
tree580baa4e5a3e5bed4cef74a4e9a523b8010f6020 /lib/raid6/x86.h
parentd5302fe41ffb28d0a48be6a71becba36d3453ae0 (diff)
Further tidyup of raid6 naming in lib/raid6
Rename raid6/raid6x86.h to raid6/x86.h and modify some comments. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'lib/raid6/x86.h')
-rw-r--r--lib/raid6/x86.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/raid6/x86.h b/lib/raid6/x86.h
new file mode 100644
index 0000000..cb2a8c9
--- /dev/null
+++ b/lib/raid6/x86.h
@@ -0,0 +1,61 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ * Boston MA 02111-1307, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * 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/i387.h>
+
+#else /* Dummy code for user space testing */
+
+static inline void kernel_fpu_begin(void)
+{
+}
+
+static inline void kernel_fpu_end(void)
+{
+}
+
+#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_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 = (flag >> 5) ? 0x80000001 : 1;
+ u32 edx;
+
+ asm volatile("cpuid"
+ : "+a" (eax), "=d" (edx)
+ : : "ecx", "ebx");
+
+ return (edx >> (flag & 31)) & 1;
+}
+
+#endif /* ndef __KERNEL__ */
+
+#endif
+#endif

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