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 */