diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-07-29 10:29:20 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-30 19:49:24 +0200 |
| commit | b359e8a434cc3d09847010fc4aeccf48d69740e4 (patch) | |
| tree | 8911c299dc1768c78d5452a1e7e0efd2fc8d5abb /include/asm-x86/thread_info.h | |
| parent | dc1e35c6e95e8923cf1d3510438b63c600fee1e2 (diff) | |
x86, xsave: context switch support using xsave/xrstor
Uses xsave/xrstor (instead of traditional fxsave/fxrstor) in context switch
when available.
Introduces TS_XSAVE flag, which determine the need to use xsave/xrstor
instructions during context switch instead of the legacy fxsave/fxrstor
instructions. Thread-synchronous status word is already in L1 cache during
this code patch and thus minimizes the performance penality compared to
(cpu_has_xsave) checks.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/thread_info.h')
| -rw-r--r-- | include/asm-x86/thread_info.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/thread_info.h b/include/asm-x86/thread_info.h index e64be8863b7..30586f2ee55 100644 --- a/include/asm-x86/thread_info.h +++ b/include/asm-x86/thread_info.h @@ -239,6 +239,7 @@ static inline struct thread_info *stack_thread_info(void) #define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */ #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ +#define TS_XSAVE 0x0010 /* Use xsave/xrstor */ #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) |