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 #define XSTATE_AVX512 (XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
20 /* Bit 63 of XCR0 is reserved for future expansion */
21 #define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
23 #define FXSAVE_SIZE 512
25 #define XSAVE_HDR_SIZE 64
26 #define XSAVE_HDR_OFFSET FXSAVE_SIZE
28 #define XSAVE_YMM_SIZE 256
29 #define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
31 /* Supported features which support lazy state saving */
32 #define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
33 | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
35 /* Supported features which require eager state saving */
36 #define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
38 /* All currently supported features */
39 #define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
42 #define REX_PREFIX "0x48, "
47 extern unsigned int xstate_size;
48 extern u64 pcntxt_mask;
49 extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
50 extern struct xsave_struct *init_xstate_buf;
52 extern void xsave_init(void);
53 extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
54 extern int init_fpu(struct task_struct *child);
56 /* These macros all use (%edi)/(%rdi) as the single memory argument. */
57 #define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27"
58 #define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37"
59 #define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f"
60 #define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f"
61 #define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f"
63 #define xstate_fault ".section .fixup,\"ax\"\n" \
64 "3: movl $-1,%[err]\n" \
67 _ASM_EXTABLE(1b, 3b) \
71 * This function is called only during boot time when x86 caps are not set
72 * up and alternative can not be used yet.
74 static inline int xsave_state_booting(struct xsave_struct *fx, u64 mask)
77 u32 hmask = mask >> 32;
80 WARN_ON(system_state != SYSTEM_BOOTING);
82 if (boot_cpu_has(X86_FEATURE_XSAVES))
83 asm volatile("1:"XSAVES"\n\t"
85 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
88 asm volatile("1:"XSAVE"\n\t"
90 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
93 asm volatile(xstate_fault
101 * This function is called only during boot time when x86 caps are not set
102 * up and alternative can not be used yet.
104 static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
107 u32 hmask = mask >> 32;
110 WARN_ON(system_state != SYSTEM_BOOTING);
112 if (boot_cpu_has(X86_FEATURE_XSAVES))
113 asm volatile("1:"XRSTORS"\n\t"
115 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
118 asm volatile("1:"XRSTOR"\n\t"
120 : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
123 asm volatile(xstate_fault
131 * Save processor xstate to xsave area.
133 static inline int xsave_state(struct xsave_struct *fx, u64 mask)
136 u32 hmask = mask >> 32;
140 * If xsaves is enabled, xsaves replaces xsaveopt because
141 * it supports compact format and supervisor states in addition to
142 * modified optimization in xsaveopt.
144 * Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave
145 * because xsaveopt supports modified optimization which is not
146 * supported by xsave.
148 * If none of xsaves and xsaveopt is enabled, use xsave.
153 X86_FEATURE_XSAVEOPT,
156 [fx] "D" (fx), "a" (lmask), "d" (hmask) :
158 asm volatile("2:\n\t"
167 * Restore processor xstate from xsave area.
169 static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
173 u32 hmask = mask >> 32;
176 * Use xrstors to restore context if it is enabled. xrstors supports
177 * compacted format of xsave area which is not supported by xrstor.
183 "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
195 * Save xstate context for old process during context switch.
197 static inline void fpu_xsave(struct fpu *fpu)
199 xsave_state(&fpu->state->xsave, -1);
203 * Restore xstate context for new process during context switch.
205 static inline int fpu_xrstor_checking(struct xsave_struct *fx)
207 return xrstor_state(fx, -1);
211 * Save xstate to user space xsave area.
213 * We don't use modified optimization because xrstor/xrstors might track
214 * a different application.
216 * We don't use compacted format xsave area for
217 * backward compatibility for old applications which don't understand
218 * compacted format of xsave area.
220 static inline int xsave_user(struct xsave_struct __user *buf)
225 * Clear the xsave header first, so that reserved fields are
226 * initialized to zero.
228 err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr));
232 __asm__ __volatile__(ASM_STAC "\n"
236 : "D" (buf), "a" (-1), "d" (-1), "0" (0)
242 * Restore xstate from user space xsave area.
244 static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
247 struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
249 u32 hmask = mask >> 32;
251 __asm__ __volatile__(ASM_STAC "\n"
255 : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
256 : "memory"); /* memory required? */
260 void *get_xsave_addr(struct xsave_struct *xsave, int xstate);
261 void setup_xstate_comp(void);