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Commit 9dc89c0f authored by Suresh Siddha's avatar Suresh Siddha Committed by Ingo Molnar
Browse files

x86, xsave: xsave/xrstor specific routines 



Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ab513701

include/asm-x86/xsave.h

+52 −0
Original line number Diff line number Diff line
@@ -48,6 +48,58 @@ static inline int xrstor_checking(struct xsave_struct *fx) 
	return err;

}



static inline int xsave_check(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,

				unsigned int lmask,

				unsigned int hmask)

{

	int err;

	struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);



	__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, int lmask, int hmask)

{

	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