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   1 /* MN10300 FPU definitions
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * Derived from include/asm-i386/i387.h: Copyright (C) 1994 Linus Torvalds
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public Licence
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the Licence, or (at your option) any later version.
  11  */
  12 #ifndef _ASM_FPU_H
  13 #define _ASM_FPU_H
  14
  15 #include <asm/processor.h>
  16 #include <asm/sigcontext.h>
  17 #include <asm/user.h>
  18
  19 #ifdef __KERNEL__
  20
  21 /* the task that owns the FPU state */
  22 extern struct task_struct *fpu_state_owner;
  23
  24 #define set_using_fpu(tsk)                              \
  25 do {                                                    \
  26         (tsk)->thread.fpu_flags |= THREAD_USING_FPU;    \
  27 } while (0)
  28
  29 #define clear_using_fpu(tsk)                            \
  30 do {                                                    \
  31         (tsk)->thread.fpu_flags &= ~THREAD_USING_FPU;   \
  32 } while (0)
  33
  34 #define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
  35
  36 #define unlazy_fpu(tsk)                                 \
  37 do {                                                    \
  38         preempt_disable();                              \
  39         if (fpu_state_owner == (tsk))                   \
  40                 fpu_save(&tsk->thread.fpu_state);       \
  41         preempt_enable();                               \
  42 } while (0)
  43
  44 #define exit_fpu()                              \
  45 do {                                            \
  46         struct task_struct *__tsk = current;    \
  47         preempt_disable();                      \
  48         if (fpu_state_owner == __tsk)           \
  49                 fpu_state_owner = NULL;         \
  50         preempt_enable();                       \
  51 } while (0)
  52
  53 #define flush_fpu()                                     \
  54 do {                                                    \
  55         struct task_struct *__tsk = current;            \
  56         preempt_disable();                              \
  57         if (fpu_state_owner == __tsk) {                 \
  58                 fpu_state_owner = NULL;                 \
  59                 __tsk->thread.uregs->epsw &= ~EPSW_FE;  \
  60         }                                               \
  61         preempt_enable();                               \
  62         clear_using_fpu(__tsk);                         \
  63 } while (0)
  64
  65 extern asmlinkage void fpu_init_state(void);
  66 extern asmlinkage void fpu_kill_state(struct task_struct *);
  67 extern asmlinkage void fpu_disabled(struct pt_regs *, enum exception_code);
  68 extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
  69
  70 #ifdef CONFIG_FPU
  71 extern asmlinkage void fpu_save(struct fpu_state_struct *);
  72 extern asmlinkage void fpu_restore(struct fpu_state_struct *);
  73 #else
  74 #define fpu_save(a)
  75 #define fpu_restore(a)
  76 #endif /* CONFIG_FPU  */
  77
  78 /*
  79  * signal frame handlers
  80  */
  81 extern int fpu_setup_sigcontext(struct fpucontext *buf);
  82 extern int fpu_restore_sigcontext(struct fpucontext *buf);
  83
  84 #endif /* __KERNEL__ */
  85 #endif /* _ASM_FPU_H */