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authorIngo Molnar <mingo@elte.hu>2008-09-05 09:18:39 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-05 09:18:39 +0200
commitaccf0fa697eeb5ff4c2360edc4da5b10abac0b7b (patch)
treea57dc9aa4a6b83be8ac8b4528cf06db5621e62aa /include/asm-x86/xcr.h
parentebd60cd64f8ab1170102c3ab072eb73042b7a33d (diff)
parentfe47784ba5cbb6b713c013e046859946789b45e4 (diff)
downloadblackbird-op-linux-accf0fa697eeb5ff4c2360edc4da5b10abac0b7b.tar.gz
blackbird-op-linux-accf0fa697eeb5ff4c2360edc4da5b10abac0b7b.zip
Merge branch 'x86/xsave' into x86/core
Diffstat (limited to 'include/asm-x86/xcr.h')
-rw-r--r--include/asm-x86/xcr.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/asm-x86/xcr.h b/include/asm-x86/xcr.h
new file mode 100644
index 000000000000..f2cba4e79a23
--- /dev/null
+++ b/include/asm-x86/xcr.h
@@ -0,0 +1,49 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ * Copyright 2008 rPath, Inc. - All Rights Reserved
+ *
+ * This file is part of the Linux kernel, and is made available under
+ * the terms of the GNU General Public License version 2 or (at your
+ * option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * asm-x86/xcr.h
+ *
+ * Definitions for the eXtended Control Register instructions
+ */
+
+#ifndef _ASM_X86_XCR_H
+#define _ASM_X86_XCR_H
+
+#define XCR_XFEATURE_ENABLED_MASK 0x00000000
+
+#ifdef __KERNEL__
+# ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+
+static inline u64 xgetbv(u32 index)
+{
+ u32 eax, edx;
+
+ asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
+ : "=a" (eax), "=d" (edx)
+ : "c" (index));
+ return eax + ((u64)edx << 32);
+}
+
+static inline void xsetbv(u32 index, u64 value)
+{
+ u32 eax = value;
+ u32 edx = value >> 32;
+
+ asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */
+ : : "a" (eax), "d" (edx), "c" (index));
+}
+
+# endif /* __ASSEMBLY__ */
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_X86_XCR_H */
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