1 #ifndef __ASM_X86_XSAVE_H
2 #define __ASM_X86_XSAVE_H
4 #include <linux/types.h>
5 #include <asm/processor.h>
7 #define XSTATE_CPUID 0x0000000d
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
18 #define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
19 /* Bit 63 of XCR0 is reserved for future expansion */
20 #define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
22 #define FXSAVE_SIZE 512
24 #define XSAVE_HDR_SIZE 64
25 #define XSAVE_HDR_OFFSET FXSAVE_SIZE
27 #define XSAVE_YMM_SIZE 256
28 #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
30 /* Supported features which support lazy state saving */
31 #define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
32 | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
34 /* Supported features which require eager state saving */
35 #define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
37 /* All currently supported features */
38 #define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
41 #define REX_PREFIX "0x48, "
46 extern unsigned int xstate_size;
47 extern u64 pcntxt_mask;
48 extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
49 extern struct xsave_struct *init_xstate_buf;
51 extern void xsave_init(void);
52 extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
53 extern int init_fpu(struct task_struct *child);
55 /* These macros all use (%edi)/(%rdi) as the single memory argument. */
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"
62 #define xstate_fault ".section .fixup,\"ax\"\n" \
63 "3: movl $-1,%[err]\n" \
66 _ASM_EXTABLE(1b, 3b) \
70 * This function is called only during boot time when x86 caps are not set
71 * up and alternative can not be used yet.
73 static inline int xsave_state_booting(struct xsave_struct *fx, u64 mask)
76 u32 hmask = mask >> 32;
79 WARN_ON(system_state != SYSTEM_BOOTING);
81 if (boot_cpu_has(X86_FEATURE_XSAVES))
82 asm volatile("1:"XSAVES"\n\t"
84 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
87 asm volatile("1:"XSAVE"\n\t"
89 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
92 asm volatile(xstate_fault
100 * This function is called only during boot time when x86 caps are not set
101 * up and alternative can not be used yet.
103 static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
106 u32 hmask = mask >> 32;
109 WARN_ON(system_state != SYSTEM_BOOTING);
111 if (boot_cpu_has(X86_FEATURE_XSAVES))
112 asm volatile("1:"XRSTORS"\n\t"
114 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
117 asm volatile("1:"XRSTOR"\n\t"
119 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
122 asm volatile(xstate_fault
130 * Save processor xstate to xsave area.
132 static inline int xsave_state(struct xsave_struct *fx, u64 mask)
135 u32 hmask = mask >> 32;
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.
143 * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave
144 * because xsaveopt supports modified optimization which is not
145 * supported by xsave.
147 * If none of xsaves and xsaveopt is enabled, use xsave.
152 X86_FEATURE_XSAVEOPT,
155 [fx] "D" (fx), "a" (lmask), "d" (hmask) :
157 asm volatile("2:\n\t"
166 * Restore processor xstate from xsave area.
168 static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
172 u32 hmask = mask >> 32;
175 * Use xrstors to restore context if it is enabled. xrstors supports
176 * compacted format of xsave area which is not supported by xrstor.
182 "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
194 * Save xstate context for old process during context switch.
196 static inline void fpu_xsave(struct fpu *fpu)
198 xsave_state(&fpu->state->xsave, -1);
202 * Restore xstate context for new process during context switch.
204 static inline int fpu_xrstor_checking(struct xsave_struct *fx)
206 return xrstor_state(fx, -1);
210 * Save xstate to user space xsave area.
212 * We don't use modified optimization because xrstor/xrstors might track
213 * a different application.
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.
219 static inline int xsave_user(struct xsave_struct __user *buf)
224 * Clear the xsave header first, so that reserved fields are
225 * initialized to zero.
227 err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr));
231 __asm__ __volatile__(ASM_STAC "\n"
235 : "D" (buf), "a" (-1), "d" (-1), "0" (0)
241 * Restore xstate from user space xsave area.
243 static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
246 struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
248 u32 hmask = mask >> 32;
250 __asm__ __volatile__(ASM_STAC "\n"
254 : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
255 : "memory"); /* memory required? */
259 void *get_xsave_addr(struct xsave_struct *xsave, int xstate);
260 void setup_xstate_comp(void);