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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-29 10:29:20 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-30 19:49:24 +0200
commitb359e8a434cc3d09847010fc4aeccf48d69740e4 (patch)
tree8911c299dc1768c78d5452a1e7e0efd2fc8d5abb /include/asm-x86/thread_info.h
parentdc1e35c6e95e8923cf1d3510438b63c600fee1e2 (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.h1
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)