From 9dc89c0f96a6ce6a1b7f9a47dd8bf6f17e2002c9 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Tue, 29 Jul 2008 10:29:23 -0700 Subject: [PATCH] x86, xsave: xsave/xrstor specific routines Signed-off-by: Suresh Siddha Signed-off-by: H. Peter Anvin Signed-off-by: Ingo Molnar --- include/asm-x86/xsave.h | 52 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/include/asm-x86/xsave.h b/include/asm-x86/xsave.h index e835a917ee19..b716511aede2 100644 --- a/include/asm-x86/xsave.h +++ b/include/asm-x86/xsave.h @@ -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