#ifndef __ASM_X86_XSAVE_H #define __ASM_X86_XSAVE_H #include <linux/types.h> #include <asm/processor.h> #include <asm/i387.h> #define XSTATE_FP 0x1 #define XSTATE_SSE 0x2 #define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE) #define FXSAVE_SIZE 512 /* * These are the features that the OS can handle currently. */ #define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE) #ifdef CONFIG_X86_64 #define REX_PREFIX "0x48, " #else #define REX_PREFIX #endif extern unsigned int xstate_size; extern u64 pcntxt_mask; extern struct xsave_struct *init_xstate_buf; extern void xsave_cntxt_init(void); extern void xsave_init(void); extern int init_fpu(struct task_struct *child); extern int check_for_xstate(struct i387_fxsave_struct __user *buf, void __user *fpstate, struct _fpx_sw_bytes *sw); static inline int xrstor_checking(struct xsave_struct *fx) { int err; asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" "2:\n" ".section .fixup,\"ax\"\n" "3: movl $-1,%[err]\n" " jmp 2b\n" ".previous\n" _ASM_EXTABLE(1b, 3b) : [err] "=r" (err) : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0) : "memory"); return err; } static inline int xsave_user(struct xsave_struct __user *buf) { int err; __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" "2:\n" ".section .fixup,\"ax\"\n" "3: movl $-1,%[err]\n" " jmp 2b\n" ".previous\n" ".section __ex_table,\"a\"\n" _ASM_ALIGN "\n" _ASM_PTR "1b,3b\n" ".previous" : [err] "=r" (err) : "D" (buf), "a" (-1), "d" (-1), "0" (0) : "memory"); if (unlikely(err) && __clear_user(buf, xstate_size)) err = -EFAULT; /* No need to clear here because the caller clears USED_MATH */ return err; } static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) { int err; struct xsave_struct *xstate = ((__force struct xsave_struct *)buf); u32 lmask = mask; u32 hmask = mask >> 32; __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n" "2:\n" ".section .fixup,\"ax\"\n" "3: movl $-1,%[err]\n" " jmp 2b\n" ".previous\n" ".section __ex_table,\"a\"\n" _ASM_ALIGN "\n" _ASM_PTR "1b,3b\n" ".previous" : [err] "=r" (err) : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) : "memory"); /* memory required? */ return err; } static inline void xrstor_state(struct xsave_struct *fx, u64 mask) { u32 lmask = mask; u32 hmask = mask >> 32; asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask) : "memory"); } static inline void xsave(struct task_struct *tsk) { /* This, however, we can work around by forcing the compiler to select an addressing mode that doesn't require extended registers. */ __asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27" : : "D" (&(tsk->thread.xstate->xsave)), "a" (-1), "d"(-1) : "memory"); } #endif