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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/x86/include/asm/fpu/xstate.h
1 #ifndef __ASM_X86_XSAVE_H
2 #define __ASM_X86_XSAVE_H
4 #include <linux/types.h>
5 #include <asm/processor.h>
6 #include <linux/uaccess.h>
8 /* Bit 63 of XCR0 is reserved for future expansion */
9 #define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
11 #define XSTATE_CPUID 0x0000000d
13 #define FXSAVE_SIZE 512
15 #define XSAVE_HDR_SIZE 64
16 #define XSAVE_HDR_OFFSET FXSAVE_SIZE
18 #define XSAVE_YMM_SIZE 256
19 #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
21 /* Supported features which support lazy state saving */
22 #define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
23 | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
25 /* Supported features which require eager state saving */
26 #define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
28 /* All currently supported features */
29 #define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
32 #define REX_PREFIX "0x48, "
37 extern unsigned int xstate_size
;
38 extern u64 xfeatures_mask
;
39 extern u64 xstate_fx_sw_bytes
[USER_XSTATE_FX_SW_WORDS
];
41 extern void update_regset_xstate_info(unsigned int size
, u64 xstate_mask
);
43 /* These macros all use (%edi)/(%rdi) as the single memory argument. */
44 #define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27"
45 #define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37"
46 #define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f"
47 #define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f"
48 #define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f"
50 /* xstate instruction fault handler: */
51 #define xstate_fault(__err) \
53 ".section .fixup,\"ax\"\n" \
55 "3: movl $-1,%[err]\n" \
60 _ASM_EXTABLE(1b, 3b) \
64 * This function is called only during boot time when x86 caps are not set
65 * up and alternative can not be used yet.
67 static inline int copy_xregs_to_kernel_booting(struct xregs_state
*fx
)
71 u32 hmask
= mask
>> 32;
74 WARN_ON(system_state
!= SYSTEM_BOOTING
);
76 if (boot_cpu_has(X86_FEATURE_XSAVES
))
77 asm volatile("1:"XSAVES
"\n\t"
80 : "D" (fx
), "m" (*fx
), "a" (lmask
), "d" (hmask
)
83 asm volatile("1:"XSAVE
"\n\t"
86 : "D" (fx
), "m" (*fx
), "a" (lmask
), "d" (hmask
)
92 * This function is called only during boot time when x86 caps are not set
93 * up and alternative can not be used yet.
95 static inline int copy_kernel_to_xregs_booting(struct xregs_state
*fx
, u64 mask
)
98 u32 hmask
= mask
>> 32;
101 WARN_ON(system_state
!= SYSTEM_BOOTING
);
103 if (boot_cpu_has(X86_FEATURE_XSAVES
))
104 asm volatile("1:"XRSTORS
"\n\t"
107 : "D" (fx
), "m" (*fx
), "a" (lmask
), "d" (hmask
)
110 asm volatile("1:"XRSTOR
"\n\t"
113 : "D" (fx
), "m" (*fx
), "a" (lmask
), "d" (hmask
)
119 * Save processor xstate to xsave area.
121 static inline int copy_xregs_to_kernel(struct xregs_state
*fx
)
125 u32 hmask
= mask
>> 32;
128 WARN_ON(!alternatives_patched
);
131 * If xsaves is enabled, xsaves replaces xsaveopt because
132 * it supports compact format and supervisor states in addition to
133 * modified optimization in xsaveopt.
135 * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave
136 * because xsaveopt supports modified optimization which is not
137 * supported by xsave.
139 * If none of xsaves and xsaveopt is enabled, use xsave.
144 X86_FEATURE_XSAVEOPT
,
147 [fx
] "D" (fx
), "a" (lmask
), "d" (hmask
) :
149 asm volatile("2:\n\t"
158 * Restore processor xstate from xsave area.
160 static inline int copy_kernel_to_xregs(struct xregs_state
*fx
, u64 mask
)
164 u32 hmask
= mask
>> 32;
167 * Use xrstors to restore context if it is enabled. xrstors supports
168 * compacted format of xsave area which is not supported by xrstor.
174 "D" (fx
), "m" (*fx
), "a" (lmask
), "d" (hmask
)
186 * Save xstate to user space xsave area.
188 * We don't use modified optimization because xrstor/xrstors might track
189 * a different application.
191 * We don't use compacted format xsave area for
192 * backward compatibility for old applications which don't understand
193 * compacted format of xsave area.
195 static inline int copy_xregs_to_user(struct xregs_state __user
*buf
)
200 * Clear the xsave header first, so that reserved fields are
201 * initialized to zero.
203 err
= __clear_user(&buf
->header
, sizeof(buf
->header
));
207 __asm__
__volatile__(ASM_STAC
"\n"
211 : "D" (buf
), "a" (-1), "d" (-1), "0" (0)
217 * Restore xstate from user space xsave area.
219 static inline int copy_user_to_xregs(struct xregs_state __user
*buf
, u64 mask
)
222 struct xregs_state
*xstate
= ((__force
struct xregs_state
*)buf
);
224 u32 hmask
= mask
>> 32;
226 __asm__
__volatile__(ASM_STAC
"\n"
230 : "D" (xstate
), "a" (lmask
), "d" (hmask
), "0" (0)
231 : "memory"); /* memory required? */
235 void *get_xsave_addr(struct xregs_state
*xsave
, int xstate
);