| Message ID | 1430274322-14383-13-git-send-email-sjg@chromium.org |
|---|---|
| State | Accepted |
| Delegated to: | Simon Glass |
| Headers | show |
On Wed, Apr 29, 2015 at 10:25 AM, Simon Glass <sjg@chromium.org> wrote: > Provide access to this x86 instruction from C code. > > Signed-off-by: Simon Glass <sjg@chromium.org> > --- > > Changes in v2: > - Remove unnecessary \t\n after mfence assembler instruction > > arch/x86/include/asm/cpu.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h > index c839291..08284ee 100644 > --- a/arch/x86/include/asm/cpu.h > +++ b/arch/x86/include/asm/cpu.h > @@ -151,6 +151,11 @@ static inline int flag_is_changeable_p(uint32_t flag) > return ((f1^f2) & flag) != 0; > } > > +static inline void mfence(void) > +{ > + __asm__ __volatile__("mfence" : : : "memory"); > +} > + > /** > * cpu_enable_paging_pae() - Enable PAE-paging > * > -- Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
On 28 April 2015 at 23:19, Bin Meng <bmeng.cn@gmail.com> wrote: > On Wed, Apr 29, 2015 at 10:25 AM, Simon Glass <sjg@chromium.org> wrote: >> Provide access to this x86 instruction from C code. >> >> Signed-off-by: Simon Glass <sjg@chromium.org> >> --- >> >> Changes in v2: >> - Remove unnecessary \t\n after mfence assembler instruction >> >> arch/x86/include/asm/cpu.h | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h >> index c839291..08284ee 100644 >> --- a/arch/x86/include/asm/cpu.h >> +++ b/arch/x86/include/asm/cpu.h >> @@ -151,6 +151,11 @@ static inline int flag_is_changeable_p(uint32_t flag) >> return ((f1^f2) & flag) != 0; >> } >> >> +static inline void mfence(void) >> +{ >> + __asm__ __volatile__("mfence" : : : "memory"); >> +} >> + >> /** >> * cpu_enable_paging_pae() - Enable PAE-paging >> * >> -- > > Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Applied to u-boot-x86.
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index c839291..08284ee 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -151,6 +151,11 @@ static inline int flag_is_changeable_p(uint32_t flag) return ((f1^f2) & flag) != 0; } +static inline void mfence(void) +{ + __asm__ __volatile__("mfence" : : : "memory"); +} + /** * cpu_enable_paging_pae() - Enable PAE-paging *
Provide access to this x86 instruction from C code. Signed-off-by: Simon Glass <sjg@chromium.org> --- Changes in v2: - Remove unnecessary \t\n after mfence assembler instruction arch/x86/include/asm/cpu.h | 5 +++++ 1 file changed, 5 insertions(+)