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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 | ||
2d5b5a66 SY |
16 | #define XSAVE_HDR_SIZE 64 |
17 | #define XSAVE_HDR_OFFSET FXSAVE_SIZE | |
18 | ||
19 | #define XSAVE_YMM_SIZE 256 | |
20 | #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET) | |
5ee481da | 21 | |
dc1e35c6 SS |
22 | /* |
23 | * These are the features that the OS can handle currently. | |
24 | */ | |
a30469e7 | 25 | #define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) |
dc1e35c6 | 26 | |
b359e8a4 SS |
27 | #ifdef CONFIG_X86_64 |
28 | #define REX_PREFIX "0x48, " | |
29 | #else | |
30 | #define REX_PREFIX | |
31 | #endif | |
32 | ||
6152e4b1 PA |
33 | extern unsigned int xstate_size; |
34 | extern u64 pcntxt_mask; | |
dc1e35c6 | 35 | extern struct xsave_struct *init_xstate_buf; |
5b3efd50 | 36 | extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; |
dc1e35c6 SS |
37 | |
38 | extern void xsave_cntxt_init(void); | |
39 | extern void xsave_init(void); | |
5b3efd50 | 40 | extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask); |
b359e8a4 | 41 | extern int init_fpu(struct task_struct *child); |
c37b5efe SS |
42 | extern int check_for_xstate(struct i387_fxsave_struct __user *buf, |
43 | void __user *fpstate, | |
44 | struct _fpx_sw_bytes *sw); | |
b359e8a4 | 45 | |
86603283 | 46 | static inline int fpu_xrstor_checking(struct fpu *fpu) |
b359e8a4 | 47 | { |
86603283 | 48 | struct xsave_struct *fx = &fpu->state->xsave; |
b359e8a4 SS |
49 | int err; |
50 | ||
51 | asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" | |
52 | "2:\n" | |
53 | ".section .fixup,\"ax\"\n" | |
54 | "3: movl $-1,%[err]\n" | |
55 | " jmp 2b\n" | |
56 | ".previous\n" | |
57 | _ASM_EXTABLE(1b, 3b) | |
58 | : [err] "=r" (err) | |
59 | : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0) | |
60 | : "memory"); | |
61 | ||
62 | return err; | |
63 | } | |
64 | ||
c37b5efe | 65 | static inline int xsave_user(struct xsave_struct __user *buf) |
9dc89c0f SS |
66 | { |
67 | int err; | |
68 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" | |
69 | "2:\n" | |
70 | ".section .fixup,\"ax\"\n" | |
71 | "3: movl $-1,%[err]\n" | |
72 | " jmp 2b\n" | |
73 | ".previous\n" | |
74 | ".section __ex_table,\"a\"\n" | |
75 | _ASM_ALIGN "\n" | |
76 | _ASM_PTR "1b,3b\n" | |
77 | ".previous" | |
78 | : [err] "=r" (err) | |
79 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) | |
80 | : "memory"); | |
81 | if (unlikely(err) && __clear_user(buf, xstate_size)) | |
82 | err = -EFAULT; | |
83 | /* No need to clear here because the caller clears USED_MATH */ | |
84 | return err; | |
85 | } | |
86 | ||
6152e4b1 | 87 | static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) |
9dc89c0f SS |
88 | { |
89 | int err; | |
90 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); | |
6152e4b1 PA |
91 | u32 lmask = mask; |
92 | u32 hmask = mask >> 32; | |
9dc89c0f SS |
93 | |
94 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" | |
95 | "2:\n" | |
96 | ".section .fixup,\"ax\"\n" | |
97 | "3: movl $-1,%[err]\n" | |
98 | " jmp 2b\n" | |
99 | ".previous\n" | |
100 | ".section __ex_table,\"a\"\n" | |
101 | _ASM_ALIGN "\n" | |
102 | _ASM_PTR "1b,3b\n" | |
103 | ".previous" | |
104 | : [err] "=r" (err) | |
105 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) | |
106 | : "memory"); /* memory required? */ | |
107 | return err; | |
108 | } | |
109 | ||
6152e4b1 | 110 | static inline void xrstor_state(struct xsave_struct *fx, u64 mask) |
9dc89c0f | 111 | { |
6152e4b1 PA |
112 | u32 lmask = mask; |
113 | u32 hmask = mask >> 32; | |
114 | ||
9dc89c0f SS |
115 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" |
116 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
117 | : "memory"); | |
118 | } | |
119 | ||
86603283 | 120 | static inline void fpu_xsave(struct fpu *fpu) |
b359e8a4 SS |
121 | { |
122 | /* This, however, we can work around by forcing the compiler to select | |
123 | an addressing mode that doesn't require extended registers. */ | |
124 | __asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27" | |
86603283 | 125 | : : "D" (&(fpu->state->xsave)), |
b359e8a4 SS |
126 | "a" (-1), "d"(-1) : "memory"); |
127 | } | |
dc1e35c6 | 128 | #endif |