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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-i386/i387.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-i386/i387.h')
-rw-r--r--include/asm-i386/i387.h115
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 */