fpu: Add fpu.h header

We will need these structures for restore FPU
state via sigframe, as as we decode data provided
by ptrace.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/fpu.h

+#ifndef FPU_H__
+#define FPU_H__
+
+#include <sys/types.h>
+
+#include "compiler.h"
+#include "types.h"
+
+#define FP_MIN_ALIGN_BYTES		64
+
+#define FP_XSTATE_MAGIC1		0x46505853U
+#define FP_XSTATE_MAGIC2		0x46505845U
+#define FP_XSTATE_MAGIC2_SIZE		sizeof(FP_XSTATE_MAGIC2)
+
+#define XSTATE_FP			0x1
+#define XSTATE_SSE			0x2
+#define XSTATE_YMM			0x4
+
+#define FXSAVE_SIZE			512
+#define XSAVE_SIZE			832
+
+struct fpx_sw_bytes {
+	u32				magic1;
+	u32				extended_size;
+	u64				xstate_bv;
+	u32				xstate_size;
+	u32				padding[7];
+};
+
+struct i387_fxsave_struct {
+	u16				cwd; /* Control Word			*/
+	u16				swd; /* Status Word			*/
+	u16				twd; /* Tag Word			*/
+	u16				fop; /* Last Instruction Opcode		*/
+	union {
+		struct {
+			u64		rip; /* Instruction Pointer		*/
+			u64		rdp; /* Data Pointer			*/
+		};
+		struct {
+			u32		fip; /* FPU IP Offset			*/
+			u32		fcs; /* FPU IP Selector			*/
+			u32		foo; /* FPU Operand Offset		*/
+			u32		fos; /* FPU Operand Selector		*/
+		};
+	};
+	u32				mxcsr;		/* MXCSR Register State */
+	u32				mxcsr_mask;	/* MXCSR Mask		*/
+
+	/* 8*16 bytes for each FP-reg = 128 bytes				*/
+	u32				st_space[32];
+
+	/* 16*16 bytes for each XMM-reg = 256 bytes				*/
+	u32				xmm_space[64];
+
+	u32				padding[12];
+
+	union {
+		u32			padding1[12];
+		u32			sw_reserved[12];
+	};
+
+} __aligned(16);
+
+struct xsave_hdr_struct {
+	u64				xstate_bv;
+	u64				reserved1[2];
+	u64				reserved2[5];
+} __packed;
+
+struct ymmh_struct {
+	u32				ymmh_space[64];
+} __packed;
+
+/*
+ * cpu requires it to be 64 byte aligned
+ */
+struct xsave_struct {
+	struct i387_fxsave_struct	i387;
+	struct xsave_hdr_struct		xsave_hdr;
+	struct ymmh_struct		ymmh;
+} __aligned(FP_MIN_ALIGN_BYTES) __packed;
+
+#endif /* FPU_H__ */