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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; |
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 | { |
61 | int err; | |
62 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" | |
63 | "2:\n" | |
64 | ".section .fixup,\"ax\"\n" | |
65 | "3: movl $-1,%[err]\n" | |
66 | " jmp 2b\n" | |
67 | ".previous\n" | |
68 | ".section __ex_table,\"a\"\n" | |
69 | _ASM_ALIGN "\n" | |
70 | _ASM_PTR "1b,3b\n" | |
71 | ".previous" | |
72 | : [err] "=r" (err) | |
73 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) | |
74 | : "memory"); | |
75 | if (unlikely(err) && __clear_user(buf, xstate_size)) | |
76 | err = -EFAULT; | |
77 | /* No need to clear here because the caller clears USED_MATH */ | |
78 | return err; | |
79 | } | |
80 | ||
6152e4b1 | 81 | static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) |
9dc89c0f SS |
82 | { |
83 | int err; | |
84 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); | |
6152e4b1 PA |
85 | u32 lmask = mask; |
86 | u32 hmask = mask >> 32; | |
9dc89c0f SS |
87 | |
88 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" | |
89 | "2:\n" | |
90 | ".section .fixup,\"ax\"\n" | |
91 | "3: movl $-1,%[err]\n" | |
92 | " jmp 2b\n" | |
93 | ".previous\n" | |
94 | ".section __ex_table,\"a\"\n" | |
95 | _ASM_ALIGN "\n" | |
96 | _ASM_PTR "1b,3b\n" | |
97 | ".previous" | |
98 | : [err] "=r" (err) | |
99 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) | |
100 | : "memory"); /* memory required? */ | |
101 | return err; | |
102 | } | |
103 | ||
6152e4b1 | 104 | static inline void xrstor_state(struct xsave_struct *fx, u64 mask) |
9dc89c0f | 105 | { |
6152e4b1 PA |
106 | u32 lmask = mask; |
107 | u32 hmask = mask >> 32; | |
108 | ||
9dc89c0f SS |
109 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" |
110 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
111 | : "memory"); | |
112 | } | |
113 | ||
29104e10 SS |
114 | static inline void xsave_state(struct xsave_struct *fx, u64 mask) |
115 | { | |
116 | u32 lmask = mask; | |
117 | u32 hmask = mask >> 32; | |
118 | ||
119 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x27\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"); |
131 | } | |
dc1e35c6 | 132 | #endif |