[deliverable/linux.git] / arch / x86 / include / asm / xsave.h

#ifndef __ASM_X86_XSAVE_H
#define __ASM_X86_XSAVE_H

#include <linux/types.h>
#include <asm/processor.h>
#include <asm/i387.h>

#define XSTATE_FP	0x1
#define XSTATE_SSE	0x2

#define XSTATE_FPSSE	(XSTATE_FP | XSTATE_SSE)

#define FXSAVE_SIZE	512

/*
 * These are the features that the OS can handle currently.
 */
#define XCNTXT_MASK	(XSTATE_FP | XSTATE_SSE)

#ifdef CONFIG_X86_64
#define REX_PREFIX	"0x48, "
#else
#define REX_PREFIX
#endif

extern unsigned int xstate_size;
extern u64 pcntxt_mask;
extern struct xsave_struct *init_xstate_buf;

extern void xsave_cntxt_init(void);
extern void xsave_init(void);
extern int init_fpu(struct task_struct *child);
extern int check_for_xstate(struct i387_fxsave_struct __user *buf,
			    void __user *fpstate,
			    struct _fpx_sw_bytes *sw);

static inline int xrstor_checking(struct xsave_struct *fx)
{
	int err;

	asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
		     "2:\n"
		     ".section .fixup,\"ax\"\n"
		     "3:  movl $-1,%[err]\n"
		     "    jmp  2b\n"
		     ".previous\n"
		     _ASM_EXTABLE(1b, 3b)
		     : [err] "=r" (err)
		     : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
		     : "memory");

	return err;
}

static inline int xsave_user(struct xsave_struct __user *buf)
{
	int err;
	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
			     "2:\n"
			     ".section .fixup,\"ax\"\n"
			     "3:  movl $-1,%[err]\n"
			     "    jmp  2b\n"
			     ".previous\n"
			     ".section __ex_table,\"a\"\n"
			     _ASM_ALIGN "\n"
			     _ASM_PTR "1b,3b\n"
			     ".previous"
			     : [err] "=r" (err)
			     : "D" (buf), "a" (-1), "d" (-1), "0" (0)
			     : "memory");
	if (unlikely(err) && __clear_user(buf, xstate_size))
		err = -EFAULT;
	/* No need to clear here because the caller clears USED_MATH */
	return err;
}

static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
{
	int err;
	struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
	u32 lmask = mask;
	u32 hmask = mask >> 32;

	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
			     "2:\n"
			     ".section .fixup,\"ax\"\n"
			     "3:  movl $-1,%[err]\n"
			     "    jmp  2b\n"
			     ".previous\n"
			     ".section __ex_table,\"a\"\n"
			     _ASM_ALIGN "\n"
			     _ASM_PTR "1b,3b\n"
			     ".previous"
			     : [err] "=r" (err)
			     : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
			     : "memory");	/* memory required? */
	return err;
}

static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
{
	u32 lmask = mask;
	u32 hmask = mask >> 32;

	asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
		     : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
		     :   "memory");
}

static inline void xsave(struct task_struct *tsk)
{
	/* This, however, we can work around by forcing the compiler to select
	   an addressing mode that doesn't require extended registers. */
	__asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
			     : : "D" (&(tsk->thread.xstate->xsave)),
				 "a" (-1), "d"(-1) : "memory");
}
#endif
Commit	Line	Data
dc1e35c6 SS	1	#ifndef __ASM_X86_XSAVE_H
	2	#define __ASM_X86_XSAVE_H
	3
6152e4b1	4	#include <linux/types.h>
dc1e35c6 SS	5	#include <asm/processor.h>
	6	#include <asm/i387.h>
	7
	8	#define XSTATE_FP 0x1
	9	#define XSTATE_SSE 0x2
	10
	11	#define XSTATE_FPSSE (XSTATE_FP \| XSTATE_SSE)
	12
	13	#define FXSAVE_SIZE 512
	14
	15	/*
	16	* These are the features that the OS can handle currently.
	17	*/
6152e4b1	18	#define XCNTXT_MASK (XSTATE_FP \| XSTATE_SSE)
dc1e35c6	19
b359e8a4 SS	20	#ifdef CONFIG_X86_64
	21	#define REX_PREFIX "0x48, "
	22	#else
	23	#define REX_PREFIX
	24	#endif
	25
6152e4b1 PA	26	extern unsigned int xstate_size;
6152e4b1 PA	27	extern u64 pcntxt_mask;
dc1e35c6 SS	28	extern struct xsave_struct *init_xstate_buf;
	29
	30	extern void xsave_cntxt_init(void);
	31	extern void xsave_init(void);
b359e8a4	32	extern int init_fpu(struct task_struct *child);
c37b5efe SS	33	extern int check_for_xstate(struct i387_fxsave_struct __user *buf,
	34	void __user *fpstate,
	35	struct _fpx_sw_bytes *sw);
b359e8a4 SS	36
	37	static inline int xrstor_checking(struct xsave_struct *fx)
	38	{
	39	int err;
	40
	41	asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
	42	"2:\n"
	43	".section .fixup,\"ax\"\n"
	44	"3: movl $-1,%[err]\n"
	45	" jmp 2b\n"
	46	".previous\n"
	47	_ASM_EXTABLE(1b, 3b)
	48	: [err] "=r" (err)
	49	: "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
	50	: "memory");
	51
	52	return err;
	53	}
	54
c37b5efe	55	static inline int xsave_user(struct xsave_struct __user *buf)
9dc89c0f SS	56	{
	57	int err;
	58	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
	59	"2:\n"
	60	".section .fixup,\"ax\"\n"
	61	"3: movl $-1,%[err]\n"
	62	" jmp 2b\n"
	63	".previous\n"
	64	".section __ex_table,\"a\"\n"
	65	_ASM_ALIGN "\n"
	66	_ASM_PTR "1b,3b\n"
	67	".previous"
	68	: [err] "=r" (err)
	69	: "D" (buf), "a" (-1), "d" (-1), "0" (0)
	70	: "memory");
	71	if (unlikely(err) && __clear_user(buf, xstate_size))
	72	err = -EFAULT;
	73	/* No need to clear here because the caller clears USED_MATH */
	74	return err;
	75	}
	76
6152e4b1	77	static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
9dc89c0f SS	78	{
	79	int err;
	80	struct xsave_struct xstate = ((__force struct xsave_struct )buf);
6152e4b1 PA	81	u32 lmask = mask;
6152e4b1 PA	82	u32 hmask = mask >> 32;
9dc89c0f SS	83
	84	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
	85	"2:\n"
	86	".section .fixup,\"ax\"\n"
	87	"3: movl $-1,%[err]\n"
	88	" jmp 2b\n"
	89	".previous\n"
	90	".section __ex_table,\"a\"\n"
	91	_ASM_ALIGN "\n"
	92	_ASM_PTR "1b,3b\n"
	93	".previous"
	94	: [err] "=r" (err)
	95	: "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
	96	: "memory"); /* memory required? */
	97	return err;
	98	}
	99
6152e4b1	100	static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
9dc89c0f	101	{
6152e4b1 PA	102	u32 lmask = mask;
	103	u32 hmask = mask >> 32;
	104
9dc89c0f SS	105	asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
	106	: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
	107	: "memory");
	108	}
	109
b359e8a4 SS	110	static inline void xsave(struct task_struct *tsk)
	111	{
	112	/* This, however, we can work around by forcing the compiler to select
	113	an addressing mode that doesn't require extended registers. */
	114	__asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
	115	: : "D" (&(tsk->thread.xstate->xsave)),
	116	"a" (-1), "d"(-1) : "memory");
	117	}
dc1e35c6	118	#endif