projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| dc1e35c6 SS |
1 | #ifndef __ASM_X86_XSAVE_H |
| 2 | #define __ASM_X86_XSAVE_H | |
| 3 | ||
| 4 | #include <asm/processor.h> | |
| 5 | #include <asm/i387.h> | |
| 6 | ||
| 7 | #define XSTATE_FP 0x1 | |
| 8 | #define XSTATE_SSE 0x2 | |
| 9 | ||
| 10 | #define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE) | |
| 11 | ||
| 12 | #define FXSAVE_SIZE 512 | |
| 13 | ||
| 14 | /* | |
| 15 | * These are the features that the OS can handle currently. | |
| 16 | */ | |
| 17 | #define XCNTXT_LMASK (XSTATE_FP | XSTATE_SSE) | |
| 18 | #define XCNTXT_HMASK 0x0 | |
| 19 | ||
| b359e8a4 SS |
20 | #ifdef CONFIG_X86_64 |
| 21 | #define REX_PREFIX "0x48, " | |
| 22 | #else | |
| 23 | #define REX_PREFIX | |
| 24 | #endif | |
| 25 | ||
| dc1e35c6 SS |
26 | extern unsigned int xstate_size, pcntxt_hmask, pcntxt_lmask; |
| 27 | extern struct xsave_struct *init_xstate_buf; | |
| 28 | ||
| 29 | extern void xsave_cntxt_init(void); | |
| 30 | extern void xsave_init(void); | |
| b359e8a4 SS |
31 | extern int init_fpu(struct task_struct *child); |
| 32 | ||
| 33 | static inline int xrstor_checking(struct xsave_struct *fx) | |
| 34 | { | |
| 35 | int err; | |
| 36 | ||
| 37 | asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" | |
| 38 | "2:\n" | |
| 39 | ".section .fixup,\"ax\"\n" | |
| 40 | "3: movl $-1,%[err]\n" | |
| 41 | " jmp 2b\n" | |
| 42 | ".previous\n" | |
| 43 | _ASM_EXTABLE(1b, 3b) | |
| 44 | : [err] "=r" (err) | |
| 45 | : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0) | |
| 46 | : "memory"); | |
| 47 | ||
| 48 | return err; | |
| 49 | } | |
| 50 | ||
| 9dc89c0f SS |
51 | static inline int xsave_check(struct xsave_struct __user *buf) |
| 52 | { | |
| 53 | int err; | |
| 54 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" | |
| 55 | "2:\n" | |
| 56 | ".section .fixup,\"ax\"\n" | |
| 57 | "3: movl $-1,%[err]\n" | |
| 58 | " jmp 2b\n" | |
| 59 | ".previous\n" | |
| 60 | ".section __ex_table,\"a\"\n" | |
| 61 | _ASM_ALIGN "\n" | |
| 62 | _ASM_PTR "1b,3b\n" | |
| 63 | ".previous" | |
| 64 | : [err] "=r" (err) | |
| 65 | : "D" (buf), "a" (-1), "d" (-1), "0" (0) | |
| 66 | : "memory"); | |
| 67 | if (unlikely(err) && __clear_user(buf, xstate_size)) | |
| 68 | err = -EFAULT; | |
| 69 | /* No need to clear here because the caller clears USED_MATH */ | |
| 70 | return err; | |
| 71 | } | |
| 72 | ||
| 73 | static inline int xrestore_user(struct xsave_struct __user *buf, | |
| 74 | unsigned int lmask, | |
| 75 | unsigned int hmask) | |
| 76 | { | |
| 77 | int err; | |
| 78 | struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); | |
| 79 | ||
| 80 | __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" | |
| 81 | "2:\n" | |
| 82 | ".section .fixup,\"ax\"\n" | |
| 83 | "3: movl $-1,%[err]\n" | |
| 84 | " jmp 2b\n" | |
| 85 | ".previous\n" | |
| 86 | ".section __ex_table,\"a\"\n" | |
| 87 | _ASM_ALIGN "\n" | |
| 88 | _ASM_PTR "1b,3b\n" | |
| 89 | ".previous" | |
| 90 | : [err] "=r" (err) | |
| 91 | : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) | |
| 92 | : "memory"); /* memory required? */ | |
| 93 | return err; | |
| 94 | } | |
| 95 | ||
| 96 | static inline void xrstor_state(struct xsave_struct *fx, int lmask, int hmask) | |
| 97 | { | |
| 98 | asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" | |
| 99 | : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) | |
| 100 | : "memory"); | |
| 101 | } | |
| 102 | ||
| b359e8a4 SS |
103 | static inline void xsave(struct task_struct *tsk) |
| 104 | { | |
| 105 | /* This, however, we can work around by forcing the compiler to select | |
| 106 | an addressing mode that doesn't require extended registers. */ | |
| 107 | __asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27" | |
| 108 | : : "D" (&(tsk->thread.xstate->xsave)), | |
| 109 | "a" (-1), "d"(-1) : "memory"); | |
| 110 | } | |
| dc1e35c6 | 111 | #endif |