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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 | ||
c9e5a5a7 | 55 | /* These macros all use (%edi)/(%rdi) as the single memory argument. */ |
200b08a9 FY |
56 | #define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27" |
57 | #define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37" | |
58 | #define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f" | |
59 | #define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f" | |
60 | #define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f" | |
61 | ||
b84e7055 FY |
62 | #define xstate_fault ".section .fixup,\"ax\"\n" \ |
63 | "3: movl $-1,%[err]\n" \ | |
64 | " jmp 2b\n" \ | |
65 | ".previous\n" \ | |
66 | _ASM_EXTABLE(1b, 3b) \ | |
67 | : [err] "=r" (err) | |
68 | ||
adb9d526 FY |
69 | /* |
70 | * This function is called only during boot time when x86 caps are not set | |
71 | * up and alternative can not be used yet. | |
72 | */ | |
d0f2dd18 | 73 | static inline int xsave_state_booting(struct xsave_struct *fx, u64 mask) |
adb9d526 FY |
74 | { |
75 | u32 lmask = mask; | |
76 | u32 hmask = mask >> 32; | |
77 | int err = 0; | |
78 | ||
79 | WARN_ON(system_state != SYSTEM_BOOTING); | |
80 | ||
81 | if (boot_cpu_has(X86_FEATURE_XSAVES)) | |
82 | asm volatile("1:"XSAVES"\n\t" | |
83 | "2:\n\t" | |
84 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
85 | : "memory"); | |
86 | else | |
87 | asm volatile("1:"XSAVE"\n\t" | |
88 | "2:\n\t" | |
89 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
90 | : "memory"); | |
91 | ||
92 | asm volatile(xstate_fault | |
93 | : "0" (0) | |
94 | : "memory"); | |
95 | ||
96 | return err; | |
97 | } | |
98 | ||
99 | /* | |
100 | * This function is called only during boot time when x86 caps are not set | |
101 | * up and alternative can not be used yet. | |
102 | */ | |
103 | static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask) | |
104 | { | |
105 | u32 lmask = mask; | |
106 | u32 hmask = mask >> 32; | |
107 | int err = 0; | |
108 | ||
109 | WARN_ON(system_state != SYSTEM_BOOTING); | |
110 | ||
111 | if (boot_cpu_has(X86_FEATURE_XSAVES)) | |
112 | asm volatile("1:"XRSTORS"\n\t" | |
113 | "2:\n\t" | |
114 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
115 | : "memory"); | |
116 | else | |
117 | asm volatile("1:"XRSTOR"\n\t" | |
118 | "2:\n\t" | |
119 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
120 | : "memory"); | |
121 | ||
122 | asm volatile(xstate_fault | |
123 | : "0" (0) | |
124 | : "memory"); | |
125 | ||
126 | return err; | |
127 | } | |
128 | ||
f31a9f7c FY |
129 | /* |
130 | * Save processor xstate to xsave area. | |
131 | */ | |
132 | static inline int xsave_state(struct xsave_struct *fx, u64 mask) | |
133 | { | |
134 | u32 lmask = mask; | |
135 | u32 hmask = mask >> 32; | |
136 | int err = 0; | |
137 | ||
138 | /* | |
139 | * If xsaves is enabled, xsaves replaces xsaveopt because | |
140 | * it supports compact format and supervisor states in addition to | |
141 | * modified optimization in xsaveopt. | |
142 | * | |
143 | * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave | |
144 | * because xsaveopt supports modified optimization which is not | |
145 | * supported by xsave. | |
146 | * | |
147 | * If none of xsaves and xsaveopt is enabled, use xsave. | |
148 | */ | |
149 | alternative_input_2( | |
150 | "1:"XSAVE, | |
151 | "1:"XSAVEOPT, | |
152 | X86_FEATURE_XSAVEOPT, | |
153 | "1:"XSAVES, | |
154 | X86_FEATURE_XSAVES, | |
155 | [fx] "D" (fx), "a" (lmask), "d" (hmask) : | |
156 | "memory"); | |
157 | asm volatile("2:\n\t" | |
158 | xstate_fault | |
159 | : "0" (0) | |
160 | : "memory"); | |
161 | ||
162 | return err; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Restore processor xstate from xsave area. | |
167 | */ | |
168 | static inline int xrstor_state(struct xsave_struct *fx, u64 mask) | |
169 | { | |
170 | int err = 0; | |
171 | u32 lmask = mask; | |
172 | u32 hmask = mask >> 32; | |
173 | ||
174 | /* | |
175 | * Use xrstors to restore context if it is enabled. xrstors supports | |
176 | * compacted format of xsave area which is not supported by xrstor. | |
177 | */ | |
178 | alternative_input( | |
179 | "1: " XRSTOR, | |
180 | "1: " XRSTORS, | |
181 | X86_FEATURE_XSAVES, | |
182 | "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
183 | : "memory"); | |
184 | ||
185 | asm volatile("2:\n" | |
186 | xstate_fault | |
187 | : "0" (0) | |
188 | : "memory"); | |
189 | ||
190 | return err; | |
191 | } | |
192 | ||
f9de314b FY |
193 | /* |
194 | * Save xstate context for old process during context switch. | |
195 | */ | |
196 | static inline void fpu_xsave(struct fpu *fpu) | |
b359e8a4 | 197 | { |
f9de314b FY |
198 | xsave_state(&fpu->state->xsave, -1); |
199 | } | |
b359e8a4 | 200 | |
f9de314b FY |
201 | /* |
202 | * Restore xstate context for new process during context switch. | |
203 | */ | |
204 | static inline int fpu_xrstor_checking(struct xsave_struct *fx) | |
205 | { | |
206 | return xrstor_state(fx, -1); | |
b359e8a4 SS |
207 | } |
208 | ||
facbf4d9 FY |
209 | /* |
210 | * Save xstate to user space xsave area. | |
211 | * | |
212 | * We don't use modified optimization because xrstor/xrstors might track | |
213 | * a different application. | |
214 | * | |
215 | * We don't use compacted format xsave area for | |
216 | * backward compatibility for old applications which don't understand | |
217 | * compacted format of xsave area. | |
218 | */ | |
c37b5efe | 219 | static inline int xsave_user(struct xsave_struct __user *buf) |
9dc89c0f SS |
220 | { |
221 | int err; | |
8e221b6d SS |
222 | |
223 | /* | |
224 | * Clear the xsave header first, so that reserved fields are | |
225 | * initialized to zero. | |
226 | */ | |
72a671ce | 227 | err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr)); |
8e221b6d SS |
228 | if (unlikely(err)) |
229 | return -EFAULT; | |
230 | ||
63bcff2a | 231 | __asm__ __volatile__(ASM_STAC "\n" |
facbf4d9 | 232 | "1:"XSAVE"\n" |
63bcff2a | 233 | "2: " ASM_CLAC "\n" |
facbf4d9 | 234 | xstate_fault |
9dc89c0f SS |
235 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) |
236 | : "memory"); | |
9dc89c0f SS |
237 | return err; |
238 | } | |
239 | ||
facbf4d9 FY |
240 | /* |
241 | * Restore xstate from user space xsave area. | |
242 | */ | |
6152e4b1 | 243 | static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) |
9dc89c0f | 244 | { |
facbf4d9 | 245 | int err = 0; |
9dc89c0f | 246 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); |
6152e4b1 PA |
247 | u32 lmask = mask; |
248 | u32 hmask = mask >> 32; | |
9dc89c0f | 249 | |
63bcff2a | 250 | __asm__ __volatile__(ASM_STAC "\n" |
facbf4d9 | 251 | "1:"XRSTOR"\n" |
63bcff2a | 252 | "2: " ASM_CLAC "\n" |
facbf4d9 | 253 | xstate_fault |
9dc89c0f SS |
254 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) |
255 | : "memory"); /* memory required? */ | |
256 | return err; | |
257 | } | |
258 | ||
7496d645 FY |
259 | void *get_xsave_addr(struct xsave_struct *xsave, int xstate); |
260 | void setup_xstate_comp(void); | |
261 | ||
dc1e35c6 | 262 | #endif |