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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / c37b5efea43f9e500363f9973dd00e3d2cdcc685 / . / include / asm-x86 / xsave.h
blob: b7f64b9fcd94f1716c0abc9edef52125cd85427e [file] [log] [blame]
Suresh Siddhadc1e35c2008-07-29 10:29:19 -0700[diff] [blame]1#ifndef __ASM_X86_XSAVE_H
2#define __ASM_X86_XSAVE_H
3
4#include <asm/processor.h>
5#include <asm/i387.h>
6
7#define XSTATE_FP 0x1
8#define XSTATE_SSE 0x2
9
10#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
11
12#define FXSAVE_SIZE 512
13
14/*
15 * These are the features that the OS can handle currently.
16 */
17#define XCNTXT_LMASK (XSTATE_FP | XSTATE_SSE)
18#define XCNTXT_HMASK 0x0
19
Suresh Siddhab359e8a2008-07-29 10:29:20 -0700[diff] [blame]20#ifdef CONFIG_X86_64
21#define REX_PREFIX "0x48, "
22#else
23#define REX_PREFIX
24#endif
25
Suresh Siddhadc1e35c2008-07-29 10:29:19 -0700[diff] [blame]26extern unsigned int xstate_size, pcntxt_hmask, pcntxt_lmask;
27extern struct xsave_struct *init_xstate_buf;
28
29extern void xsave_cntxt_init(void);
30extern void xsave_init(void);
Suresh Siddhab359e8a2008-07-29 10:29:20 -0700[diff] [blame]31extern int init_fpu(struct task_struct *child);
Suresh Siddhac37b5ef2008-07-29 10:29:25 -0700[diff] [blame^]32extern int check_for_xstate(struct i387_fxsave_struct __user *buf,
33 void __user *fpstate,
34 struct _fpx_sw_bytes *sw);
Suresh Siddhadc1e35c2008-07-29 10:29:19 -0700[diff] [blame]35
Suresh Siddhab359e8a2008-07-29 10:29:20 -0700[diff] [blame]36static inline int xrstor_checking(struct xsave_struct *fx)
37{
38 int err;
39
40 asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
41 "2:\n"
42 ".section .fixup,\"ax\"\n"
43 "3: movl $-1,%[err]\n"
44 " jmp 2b\n"
45 ".previous\n"
46 _ASM_EXTABLE(1b, 3b)
47 : [err] "=r" (err)
48 : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
49 : "memory");
50
51 return err;
52}
53
Suresh Siddhac37b5ef2008-07-29 10:29:25 -0700[diff] [blame^]54static inline int xsave_user(struct xsave_struct __user *buf)
Suresh Siddha9dc89c02008-07-29 10:29:23 -0700[diff] [blame]55{
56 int err;
57 __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
58 "2:\n"
59 ".section .fixup,\"ax\"\n"
60 "3: movl $-1,%[err]\n"
61 " jmp 2b\n"
62 ".previous\n"
63 ".section __ex_table,\"a\"\n"
64 _ASM_ALIGN "\n"
65 _ASM_PTR "1b,3b\n"
66 ".previous"
67 : [err] "=r" (err)
68 : "D" (buf), "a" (-1), "d" (-1), "0" (0)
69 : "memory");
70 if (unlikely(err) && __clear_user(buf, xstate_size))
71 err = -EFAULT;
72 /* No need to clear here because the caller clears USED_MATH */
73 return err;
74}
75
76static inline int xrestore_user(struct xsave_struct __user *buf,
77 unsigned int lmask,
78 unsigned int hmask)
79{
80 int err;
81 struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
82
83 __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
84 "2:\n"
85 ".section .fixup,\"ax\"\n"
86 "3: movl $-1,%[err]\n"
87 " jmp 2b\n"
88 ".previous\n"
89 ".section __ex_table,\"a\"\n"
90 _ASM_ALIGN "\n"
91 _ASM_PTR "1b,3b\n"
92 ".previous"
93 : [err] "=r" (err)
94 : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
95 : "memory"); /* memory required? */
96 return err;
97}
98
99static inline void xrstor_state(struct xsave_struct *fx, int lmask, int hmask)
100{
101 asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
102 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
103 : "memory");
104}
105
Suresh Siddhab359e8a2008-07-29 10:29:20 -0700[diff] [blame]106static inline void xsave(struct task_struct *tsk)
107{
108 /* This, however, we can work around by forcing the compiler to select
109 an addressing mode that doesn't require extended registers. */
110 __asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
111 : : "D" (&(tsk->thread.xstate->xsave)),
112 "a" (-1), "d"(-1) : "memory");
113}
Suresh Siddhadc1e35c2008-07-29 10:29:19 -0700[diff] [blame]114#endif