1 files changed, 115 insertions, 0 deletions
diff --git a/include/asm-i386/i387.h b/include/asm-i386/i387.h
new file mode 100644
index 000000000000..f6feb98a9397
--- /dev/null
+++ b/include/asm-i386/i387.h
@@ -0,0 +1,115 @@
+/*
+ * include/asm-i386/i387.h
+ *
+ * Copyright (C) 1994 Linus Torvalds
+ *
+ * Pentium III FXSR, SSE support
+ * General FPU state handling cleanups
+ *	Gareth Hughes <gareth@valinux.com>, May 2000
+ */
+
+#ifndef __ASM_I386_I387_H
+#define __ASM_I386_I387_H
+
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/processor.h>
+#include <asm/sigcontext.h>
+#include <asm/user.h>
+
+extern void mxcsr_feature_mask_init(void);
+extern void init_fpu(struct task_struct *);
+/*
+ * FPU lazy state save handling...
+ */
+extern void restore_fpu( struct task_struct *tsk );
+
+extern void kernel_fpu_begin(void);
+#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
+
+/*
+ * These must be called with preempt disabled
+ */
+static inline void __save_init_fpu( struct task_struct *tsk )
+{
+	if ( cpu_has_fxsr ) {
+		asm volatile( "fxsave %0 ; fnclex"
+			      : "=m" (tsk->thread.i387.fxsave) );
+	} else {
+		asm volatile( "fnsave %0 ; fwait"
+			      : "=m" (tsk->thread.i387.fsave) );
+	}
+	tsk->thread_info->status &= ~TS_USEDFPU;
+}
+
+#define __unlazy_fpu( tsk ) do { \
+	if ((tsk)->thread_info->status & TS_USEDFPU) \
+		save_init_fpu( tsk ); \
+} while (0)
+
+#define __clear_fpu( tsk )					\
+do {								\
+	if ((tsk)->thread_info->status & TS_USEDFPU) {		\
+		asm volatile("fnclex ; fwait");				\
+		(tsk)->thread_info->status &= ~TS_USEDFPU;	\
+		stts();						\
+	}							\
+} while (0)
+
+
+/*
+ * These disable preemption on their own and are safe
+ */
+static inline void save_init_fpu( struct task_struct *tsk )
+{
+	preempt_disable();
+	__save_init_fpu(tsk);
+	stts();
+	preempt_enable();
+}
+
+#define unlazy_fpu( tsk ) do {	\
+	preempt_disable();	\
+	__unlazy_fpu(tsk);	\
+	preempt_enable();	\
+} while (0)
+
+#define clear_fpu( tsk ) do {	\
+	preempt_disable();	\
+	__clear_fpu( tsk );	\
+	preempt_enable();	\
+} while (0)
+					\
+/*
+ * FPU state interaction...
+ */
+extern unsigned short get_fpu_cwd( struct task_struct *tsk );
+extern unsigned short get_fpu_swd( struct task_struct *tsk );
+extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
+
+/*
+ * Signal frame handlers...
+ */
+extern int save_i387( struct _fpstate __user *buf );
+extern int restore_i387( struct _fpstate __user *buf );
+
+/*
+ * ptrace request handers...
+ */
+extern int get_fpregs( struct user_i387_struct __user *buf,
+		       struct task_struct *tsk );
+extern int set_fpregs( struct task_struct *tsk,
+		       struct user_i387_struct __user *buf );
+
+extern int get_fpxregs( struct user_fxsr_struct __user *buf,
+			struct task_struct *tsk );
+extern int set_fpxregs( struct task_struct *tsk,
+			struct user_fxsr_struct __user *buf );
+
+/*
+ * FPU state for core dumps...
+ */
+extern int dump_fpu( struct pt_regs *regs,
+		     struct user_i387_struct *fpu );
+
+#endif /* __ASM_I386_I387_H */