[net-next-2.6.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_YMM	0x4

#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 | XSTATE_YMM)

#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 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];

extern void xsave_cntxt_init(void);
extern void xsave_init(void);
extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
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 fpu_xrstor_checking(struct fpu *fpu)
{
	struct xsave_struct *fx = &fpu->state->xsave;
	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;

	/*
	 * Clear the xsave header first, so that reserved fields are
	 * initialized to zero.
	 */
	err = __clear_user(&buf->xsave_hdr,
			   sizeof(struct xsave_hdr_struct));
	if (unlikely(err))
		return -EFAULT;

	__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 fpu_xsave(struct fpu *fpu)
{
	/* 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" (&(fpu->state->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
a30469e7	10	#define XSTATE_YMM 0x4
dc1e35c6 SS	11
	12	#define XSTATE_FPSSE (XSTATE_FP \| XSTATE_SSE)
	13
	14	#define FXSAVE_SIZE 512
	15
	16	/*
	17	* These are the features that the OS can handle currently.
	18	*/
a30469e7	19	#define XCNTXT_MASK (XSTATE_FP \| XSTATE_SSE \| XSTATE_YMM)
dc1e35c6	20
b359e8a4 SS	21	#ifdef CONFIG_X86_64
	22	#define REX_PREFIX "0x48, "
	23	#else
	24	#define REX_PREFIX
	25	#endif
	26
6152e4b1 PA	27	extern unsigned int xstate_size;
6152e4b1 PA	28	extern u64 pcntxt_mask;
dc1e35c6	29	extern struct xsave_struct *init_xstate_buf;
5b3efd50	30	extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
dc1e35c6 SS	31
	32	extern void xsave_cntxt_init(void);
	33	extern void xsave_init(void);
5b3efd50	34	extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
b359e8a4	35	extern int init_fpu(struct task_struct *child);
c37b5efe SS	36	extern int check_for_xstate(struct i387_fxsave_struct __user *buf,
	37	void __user *fpstate,
	38	struct _fpx_sw_bytes *sw);
b359e8a4	39
86603283	40	static inline int fpu_xrstor_checking(struct fpu *fpu)
b359e8a4	41	{
86603283	42	struct xsave_struct *fx = &fpu->state->xsave;
b359e8a4 SS	43	int err;
	44
	45	asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
	46	"2:\n"
	47	".section .fixup,\"ax\"\n"
	48	"3: movl $-1,%[err]\n"
	49	" jmp 2b\n"
	50	".previous\n"
	51	_ASM_EXTABLE(1b, 3b)
	52	: [err] "=r" (err)
	53	: "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
	54	: "memory");
	55
	56	return err;
	57	}
	58
c37b5efe	59	static inline int xsave_user(struct xsave_struct __user *buf)
9dc89c0f SS	60	{
9dc89c0f SS	61	int err;
8e221b6d SS	62
	63	/*
	64	* Clear the xsave header first, so that reserved fields are
	65	* initialized to zero.
	66	*/
	67	err = __clear_user(&buf->xsave_hdr,
	68	sizeof(struct xsave_hdr_struct));
	69	if (unlikely(err))
	70	return -EFAULT;
	71
9dc89c0f SS	72	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
	73	"2:\n"
	74	".section .fixup,\"ax\"\n"
	75	"3: movl $-1,%[err]\n"
	76	" jmp 2b\n"
	77	".previous\n"
	78	".section __ex_table,\"a\"\n"
	79	_ASM_ALIGN "\n"
	80	_ASM_PTR "1b,3b\n"
	81	".previous"
	82	: [err] "=r" (err)
	83	: "D" (buf), "a" (-1), "d" (-1), "0" (0)
	84	: "memory");
	85	if (unlikely(err) && __clear_user(buf, xstate_size))
	86	err = -EFAULT;
	87	/* No need to clear here because the caller clears USED_MATH */
	88	return err;
	89	}
	90
6152e4b1	91	static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
9dc89c0f SS	92	{
	93	int err;
	94	struct xsave_struct xstate = ((__force struct xsave_struct )buf);
6152e4b1 PA	95	u32 lmask = mask;
6152e4b1 PA	96	u32 hmask = mask >> 32;
9dc89c0f SS	97
	98	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
	99	"2:\n"
	100	".section .fixup,\"ax\"\n"
	101	"3: movl $-1,%[err]\n"
	102	" jmp 2b\n"
	103	".previous\n"
	104	".section __ex_table,\"a\"\n"
	105	_ASM_ALIGN "\n"
	106	_ASM_PTR "1b,3b\n"
	107	".previous"
	108	: [err] "=r" (err)
	109	: "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
	110	: "memory"); /* memory required? */
	111	return err;
	112	}
	113
6152e4b1	114	static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
9dc89c0f	115	{
6152e4b1 PA	116	u32 lmask = mask;
	117	u32 hmask = mask >> 32;
	118
9dc89c0f SS	119	asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
	120	: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
	121	: "memory");
	122	}
	123
86603283	124	static inline void fpu_xsave(struct fpu *fpu)
b359e8a4 SS	125	{
	126	/* This, however, we can work around by forcing the compiler to select
	127	an addressing mode that doesn't require extended registers. */
	128	__asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
86603283	129	: : "D" (&(fpu->state->xsave)),
b359e8a4 SS	130	"a" (-1), "d"(-1) : "memory");
b359e8a4 SS	131	}
dc1e35c6	132	#endif