patch-2.1.124 linux/include/asm-i386/processor.h

• Lines: 28
• Date: Thu Oct 1 18:59:17 1998
• Orig file: v2.1.123/linux/include/asm-i386/processor.h
• Orig date: Sat Sep 5 16:46:41 1998

diff -u --recursive --new-file v2.1.123/linux/include/asm-i386/processor.h linux/include/asm-i386/processor.h
@@ -281,6 +281,27 @@
 extern void release_segments(struct mm_struct * mm);
 
 /*
+ * FPU lazy state save handling..
+ */
+#define save_fpu(tsk) do { \
+	asm volatile("fnsave %0\n\tfwait":"=m" (tsk->tss.i387)); \
+	tsk->flags &= ~PF_USEDFPU; \
+	stts(); \
+} while (0)
+
+#define unlazy_fpu(tsk) do { \
+	if (tsk->flags & PF_USEDFPU) \
+		save_fpu(tsk); \
+} while (0)
+
+#define clear_fpu(tsk) do { \
+	if (tsk->flags & PF_USEDFPU) { \
+		tsk->flags &= ~PF_USEDFPU; \
+		stts(); \
+	} \
+} while (0)
+
+/*
  * Return saved PC of a blocked thread.
  */
 extern inline unsigned long thread_saved_pc(struct thread_struct *t)