include/asm-i386/i387.h

   1 /*
   2  * include/asm-i386/i387.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  *
   6  * Pentium III FXSR, SSE support
   7  * General FPU state handling cleanups
   8  *      Gareth Hughes <gareth@valinux.com>, May 2000
   9  */
  10
  11 #ifndef __ASM_I386_I387_H
  12 #define __ASM_I386_I387_H
  13
  14 #include <linux/sched.h>
  15 #include <asm/processor.h>
  16 #include <asm/sigcontext.h>
  17 #include <asm/user.h>
  18
  19 extern void init_fpu(void);
  20 /*
  21  * FPU lazy state save handling...
  22  */
  23 extern void save_init_fpu( struct task_struct *tsk );
  24 extern void restore_fpu( struct task_struct *tsk );
  25
  26 #define unlazy_fpu( tsk ) do { \
  27         if ( tsk->flags & PF_USEDFPU ) \
  28                 save_init_fpu( tsk ); \
  29 } while (0)
  30
  31 #define clear_fpu( tsk ) do { \
  32         if ( tsk->flags & PF_USEDFPU ) { \
  33                 asm volatile("fwait"); \
  34                 tsk->flags &= ~PF_USEDFPU; \
  35                 stts(); \
  36         } \
  37 } while (0)
  38
  39 /*
  40  * FPU state interaction...
  41  */
  42 extern unsigned short get_fpu_cwd( struct task_struct *tsk );
  43 extern unsigned short get_fpu_swd( struct task_struct *tsk );
  44 extern unsigned short get_fpu_twd( struct task_struct *tsk );
  45 extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
  46
  47 extern void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd );
  48 extern void set_fpu_swd( struct task_struct *tsk, unsigned short swd );
  49 extern void set_fpu_twd( struct task_struct *tsk, unsigned short twd );
  50 extern void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr );
  51
  52 #define load_mxcsr( val ) do { \
  53         if ( cpu_has_xmm ) { \
  54                 unsigned long __mxcsr = ((unsigned long)(val) & 0xffff); \
  55                 asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \
  56         } \
  57 } while (0)
  58
  59 /*
  60  * Signal frame handlers...
  61  */
  62 extern int save_i387( struct _fpstate *buf );
  63 extern int restore_i387( struct _fpstate *buf );
  64
  65 /*
  66  * ptrace request handers...
  67  */
  68 extern int get_fpregs( struct user_i387_struct *buf,
  69                        struct task_struct *tsk );
  70 extern int set_fpregs( struct task_struct *tsk,
  71                        struct user_i387_struct *buf );
  72
  73 extern int get_fpxregs( struct user_fxsr_struct *buf,
  74                         struct task_struct *tsk );
  75 extern int set_fpxregs( struct task_struct *tsk,
  76                         struct user_fxsr_struct *buf );
  77
  78 /*
  79  * FPU state for core dumps...
  80  */
  81 extern int dump_fpu( struct pt_regs *regs,
  82                      struct user_i387_struct *fpu );
  83 extern int dump_extended_fpu( struct pt_regs *regs,
  84                               struct user_fxsr_struct *fpu );
  85
  86 #endif /* __ASM_I386_I387_H */