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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 | ||
200b08a9 FY |
55 | #define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27" |
56 | #define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37" | |
57 | #define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f" | |
58 | #define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f" | |
59 | #define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f" | |
60 | ||
b84e7055 FY |
61 | #define xstate_fault ".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 | ||
f31a9f7c FY |
68 | /* |
69 | * Save processor xstate to xsave area. | |
70 | */ | |
71 | static inline int xsave_state(struct xsave_struct *fx, u64 mask) | |
72 | { | |
73 | u32 lmask = mask; | |
74 | u32 hmask = mask >> 32; | |
75 | int err = 0; | |
76 | ||
77 | /* | |
78 | * If xsaves is enabled, xsaves replaces xsaveopt because | |
79 | * it supports compact format and supervisor states in addition to | |
80 | * modified optimization in xsaveopt. | |
81 | * | |
82 | * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave | |
83 | * because xsaveopt supports modified optimization which is not | |
84 | * supported by xsave. | |
85 | * | |
86 | * If none of xsaves and xsaveopt is enabled, use xsave. | |
87 | */ | |
88 | alternative_input_2( | |
89 | "1:"XSAVE, | |
90 | "1:"XSAVEOPT, | |
91 | X86_FEATURE_XSAVEOPT, | |
92 | "1:"XSAVES, | |
93 | X86_FEATURE_XSAVES, | |
94 | [fx] "D" (fx), "a" (lmask), "d" (hmask) : | |
95 | "memory"); | |
96 | asm volatile("2:\n\t" | |
97 | xstate_fault | |
98 | : "0" (0) | |
99 | : "memory"); | |
100 | ||
101 | return err; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Restore processor xstate from xsave area. | |
106 | */ | |
107 | static inline int xrstor_state(struct xsave_struct *fx, u64 mask) | |
108 | { | |
109 | int err = 0; | |
110 | u32 lmask = mask; | |
111 | u32 hmask = mask >> 32; | |
112 | ||
113 | /* | |
114 | * Use xrstors to restore context if it is enabled. xrstors supports | |
115 | * compacted format of xsave area which is not supported by xrstor. | |
116 | */ | |
117 | alternative_input( | |
118 | "1: " XRSTOR, | |
119 | "1: " XRSTORS, | |
120 | X86_FEATURE_XSAVES, | |
121 | "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
122 | : "memory"); | |
123 | ||
124 | asm volatile("2:\n" | |
125 | xstate_fault | |
126 | : "0" (0) | |
127 | : "memory"); | |
128 | ||
129 | return err; | |
130 | } | |
131 | ||
f9de314b FY |
132 | /* |
133 | * Save xstate context for old process during context switch. | |
134 | */ | |
135 | static inline void fpu_xsave(struct fpu *fpu) | |
b359e8a4 | 136 | { |
f9de314b FY |
137 | xsave_state(&fpu->state->xsave, -1); |
138 | } | |
b359e8a4 | 139 | |
f9de314b FY |
140 | /* |
141 | * Restore xstate context for new process during context switch. | |
142 | */ | |
143 | static inline int fpu_xrstor_checking(struct xsave_struct *fx) | |
144 | { | |
145 | return xrstor_state(fx, -1); | |
b359e8a4 SS |
146 | } |
147 | ||
c37b5efe | 148 | static inline int xsave_user(struct xsave_struct __user *buf) |
9dc89c0f SS |
149 | { |
150 | int err; | |
8e221b6d SS |
151 | |
152 | /* | |
153 | * Clear the xsave header first, so that reserved fields are | |
154 | * initialized to zero. | |
155 | */ | |
72a671ce | 156 | err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr)); |
8e221b6d SS |
157 | if (unlikely(err)) |
158 | return -EFAULT; | |
159 | ||
63bcff2a PA |
160 | __asm__ __volatile__(ASM_STAC "\n" |
161 | "1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" | |
162 | "2: " ASM_CLAC "\n" | |
9dc89c0f SS |
163 | ".section .fixup,\"ax\"\n" |
164 | "3: movl $-1,%[err]\n" | |
165 | " jmp 2b\n" | |
166 | ".previous\n" | |
7a040a43 | 167 | _ASM_EXTABLE(1b,3b) |
9dc89c0f SS |
168 | : [err] "=r" (err) |
169 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) | |
170 | : "memory"); | |
9dc89c0f SS |
171 | return err; |
172 | } | |
173 | ||
6152e4b1 | 174 | static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) |
9dc89c0f SS |
175 | { |
176 | int err; | |
177 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); | |
6152e4b1 PA |
178 | u32 lmask = mask; |
179 | u32 hmask = mask >> 32; | |
9dc89c0f | 180 | |
63bcff2a PA |
181 | __asm__ __volatile__(ASM_STAC "\n" |
182 | "1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" | |
183 | "2: " ASM_CLAC "\n" | |
9dc89c0f SS |
184 | ".section .fixup,\"ax\"\n" |
185 | "3: movl $-1,%[err]\n" | |
186 | " jmp 2b\n" | |
187 | ".previous\n" | |
7a040a43 | 188 | _ASM_EXTABLE(1b,3b) |
9dc89c0f SS |
189 | : [err] "=r" (err) |
190 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) | |
191 | : "memory"); /* memory required? */ | |
192 | return err; | |
193 | } | |
194 | ||
dc1e35c6 | 195 | #endif |