From: Ingo Molnar <mingo@kernel.org>
Date: Tue, 28 Apr 2015 08:56:54 +0000 (+0200)
Subject: x86/fpu: Move asm/xcr.h to asm/fpu/internal.h
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~203^2~86
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=befc61ad3c097bb6ace3da0c73ad56272ccee02d;p=pandora-kernel.git

x86/fpu: Move asm/xcr.h to asm/fpu/internal.h

Now that all FPU internals using drivers are converted to public APIs,
move xcr.h's definitions into fpu/internal.h and remove xcr.h.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 8ec785ecce81..161b51bf267e 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -430,6 +430,31 @@ static inline void fpu_reset_state(struct fpu *fpu)
 		restore_init_xstate();
 }
 
+/*
+ * Definitions for the eXtended Control Register instructions
+ */
+
+#define XCR_XFEATURE_ENABLED_MASK	0x00000000
+
+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));
+}
+
 /*
  * FPU state switching for scheduling.
  *
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