Commit | Line | Data |
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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 | 5 | #include <asm/processor.h> |
dc1e35c6 | 6 | |
ee813d53 | 7 | #define XSTATE_CPUID 0x0000000d |
dc1e35c6 | 8 | |
c2bc11f1 FY |
9 | #define XSTATE_FP 0x1 |
10 | #define XSTATE_SSE 0x2 | |
11 | #define XSTATE_YMM 0x4 | |
12 | #define XSTATE_BNDREGS 0x8 | |
13 | #define XSTATE_BNDCSR 0x10 | |
14 | #define XSTATE_OPMASK 0x20 | |
15 | #define XSTATE_ZMM_Hi256 0x40 | |
16 | #define XSTATE_Hi16_ZMM 0x80 | |
dc1e35c6 SS |
17 | |
18 | #define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE) | |
56c103ec LJ |
19 | /* Bit 63 of XCR0 is reserved for future expansion */ |
20 | #define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63))) | |
dc1e35c6 SS |
21 | |
22 | #define FXSAVE_SIZE 512 | |
23 | ||
2d5b5a66 SY |
24 | #define XSAVE_HDR_SIZE 64 |
25 | #define XSAVE_HDR_OFFSET FXSAVE_SIZE | |
26 | ||
27 | #define XSAVE_YMM_SIZE 256 | |
28 | #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET) | |
5ee481da | 29 | |
e7d820a5 | 30 | /* Supported features which support lazy state saving */ |
c2bc11f1 FY |
31 | #define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \ |
32 | | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM) | |
e7d820a5 QR |
33 | |
34 | /* Supported features which require eager state saving */ | |
35 | #define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR) | |
36 | ||
37 | /* All currently supported features */ | |
38 | #define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER) | |
dc1e35c6 | 39 | |
b359e8a4 SS |
40 | #ifdef CONFIG_X86_64 |
41 | #define REX_PREFIX "0x48, " | |
42 | #else | |
43 | #define REX_PREFIX | |
44 | #endif | |
45 | ||
6152e4b1 PA |
46 | extern unsigned int xstate_size; |
47 | extern u64 pcntxt_mask; | |
5b3efd50 | 48 | extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; |
304bceda | 49 | extern struct xsave_struct *init_xstate_buf; |
dc1e35c6 | 50 | |
dc1e35c6 | 51 | extern void xsave_init(void); |
5b3efd50 | 52 | extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask); |
b359e8a4 SS |
53 | extern int init_fpu(struct task_struct *child); |
54 | ||
0ca5bd0d | 55 | static inline int fpu_xrstor_checking(struct xsave_struct *fx) |
b359e8a4 SS |
56 | { |
57 | int err; | |
58 | ||
59 | asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" | |
60 | "2:\n" | |
61 | ".section .fixup,\"ax\"\n" | |
62 | "3: movl $-1,%[err]\n" | |
63 | " jmp 2b\n" | |
64 | ".previous\n" | |
65 | _ASM_EXTABLE(1b, 3b) | |
66 | : [err] "=r" (err) | |
67 | : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0) | |
68 | : "memory"); | |
69 | ||
70 | return err; | |
71 | } | |
72 | ||
c37b5efe | 73 | static inline int xsave_user(struct xsave_struct __user *buf) |
9dc89c0f SS |
74 | { |
75 | int err; | |
8e221b6d SS |
76 | |
77 | /* | |
78 | * Clear the xsave header first, so that reserved fields are | |
79 | * initialized to zero. | |
80 | */ | |
72a671ce | 81 | err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr)); |
8e221b6d SS |
82 | if (unlikely(err)) |
83 | return -EFAULT; | |
84 | ||
63bcff2a PA |
85 | __asm__ __volatile__(ASM_STAC "\n" |
86 | "1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" | |
87 | "2: " ASM_CLAC "\n" | |
9dc89c0f SS |
88 | ".section .fixup,\"ax\"\n" |
89 | "3: movl $-1,%[err]\n" | |
90 | " jmp 2b\n" | |
91 | ".previous\n" | |
7a040a43 | 92 | _ASM_EXTABLE(1b,3b) |
9dc89c0f SS |
93 | : [err] "=r" (err) |
94 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) | |
95 | : "memory"); | |
9dc89c0f SS |
96 | return err; |
97 | } | |
98 | ||
6152e4b1 | 99 | static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) |
9dc89c0f SS |
100 | { |
101 | int err; | |
102 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); | |
6152e4b1 PA |
103 | u32 lmask = mask; |
104 | u32 hmask = mask >> 32; | |
9dc89c0f | 105 | |
63bcff2a PA |
106 | __asm__ __volatile__(ASM_STAC "\n" |
107 | "1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" | |
108 | "2: " ASM_CLAC "\n" | |
9dc89c0f SS |
109 | ".section .fixup,\"ax\"\n" |
110 | "3: movl $-1,%[err]\n" | |
111 | " jmp 2b\n" | |
112 | ".previous\n" | |
7a040a43 | 113 | _ASM_EXTABLE(1b,3b) |
9dc89c0f SS |
114 | : [err] "=r" (err) |
115 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) | |
116 | : "memory"); /* memory required? */ | |
117 | return err; | |
118 | } | |
119 | ||
6152e4b1 | 120 | static inline void xrstor_state(struct xsave_struct *fx, u64 mask) |
9dc89c0f | 121 | { |
6152e4b1 PA |
122 | u32 lmask = mask; |
123 | u32 hmask = mask >> 32; | |
124 | ||
9dc89c0f SS |
125 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" |
126 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
127 | : "memory"); | |
128 | } | |
129 | ||
29104e10 SS |
130 | static inline void xsave_state(struct xsave_struct *fx, u64 mask) |
131 | { | |
132 | u32 lmask = mask; | |
133 | u32 hmask = mask >> 32; | |
134 | ||
135 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x27\n\t" | |
136 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
137 | : "memory"); | |
138 | } | |
139 | ||
86603283 | 140 | static inline void fpu_xsave(struct fpu *fpu) |
b359e8a4 SS |
141 | { |
142 | /* This, however, we can work around by forcing the compiler to select | |
143 | an addressing mode that doesn't require extended registers. */ | |
6bad06b7 SS |
144 | alternative_input( |
145 | ".byte " REX_PREFIX "0x0f,0xae,0x27", | |
146 | ".byte " REX_PREFIX "0x0f,0xae,0x37", | |
147 | X86_FEATURE_XSAVEOPT, | |
148 | [fx] "D" (&fpu->state->xsave), "a" (-1), "d" (-1) : | |
149 | "memory"); | |
b359e8a4 | 150 | } |
dc1e35c6 | 151 | #endif |