On Mon, Apr 28, 2014 at 03:12:37PM -0700, Andi Kleen wrote: > From: Andi Kleen <a...@linux.intel.com> > > Plus for swapgs. > > Very straight forward. Used in followon patch.
follow on > > Signed-off-by: Andi Kleen <a...@linux.intel.com> > --- > arch/x86/include/asm/fsgs.h | 43 +++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 43 insertions(+) > create mode 100644 arch/x86/include/asm/fsgs.h > > diff --git a/arch/x86/include/asm/fsgs.h b/arch/x86/include/asm/fsgs.h > new file mode 100644 > index 0000000..a3a5cd3 > --- /dev/null > +++ b/arch/x86/include/asm/fsgs.h > @@ -0,0 +1,43 @@ > +#ifndef _ASM_FSGS_H > +#define _ASM_FSGS_H 1 > + > +static inline void swapgs(void) > +{ > + asm volatile("swapgs" ::: "memory"); > +} > + > +/* Must be protected by X86_FEATURE_FSGSBASE check. */ > + > +static inline unsigned long rdgsbase(void) > +{ > + unsigned long gs; > + asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xc8 # rdgsbaseq %%rax" > + : "=a" (gs) > + :: "memory"); > + return gs; > +} > + > +static inline unsigned long rdfsbase(void) > +{ > + unsigned long fs; > + asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xc0 # rdfsbaseq %%rax" > + : "=a" (fs) > + :: "memory"); > + return fs; > +} > + > +static inline void wrgsbase(unsigned long gs) > +{ > + asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xd8 # wrgsbaseq %%rax" > + :: "a" (gs) > + : "memory"); > +} > + > +static inline void wrfsbase(unsigned long fs) > +{ > + asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xd0 # wrfsbaseq %%rax" > + :: "a" (fs) > + : "memory"); > +} > + > +#endif > -- > 1.9.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/