133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* MN10300 FPU definitions
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
* Derived from include/asm-i386/i387.h: Copyright (C) 1994 Linus Torvalds
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_FPU_H
|
|
#define _ASM_FPU_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/sched.h>
|
|
#include <asm/exceptions.h>
|
|
#include <asm/sigcontext.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
extern asmlinkage void fpu_disabled(void);
|
|
|
|
#ifdef CONFIG_FPU
|
|
|
|
#ifdef CONFIG_LAZY_SAVE_FPU
|
|
/* the task that currently owns the FPU state */
|
|
extern struct task_struct *fpu_state_owner;
|
|
#endif
|
|
|
|
#if (THREAD_USING_FPU & ~0xff)
|
|
#error THREAD_USING_FPU must be smaller than 0x100.
|
|
#endif
|
|
|
|
static inline void set_using_fpu(struct task_struct *tsk)
|
|
{
|
|
asm volatile(
|
|
"bset %0,(0,%1)"
|
|
:
|
|
: "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
static inline void clear_using_fpu(struct task_struct *tsk)
|
|
{
|
|
asm volatile(
|
|
"bclr %0,(0,%1)"
|
|
:
|
|
: "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
#define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
|
|
|
|
extern asmlinkage void fpu_kill_state(struct task_struct *);
|
|
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
|
|
extern asmlinkage void fpu_init_state(void);
|
|
extern asmlinkage void fpu_save(struct fpu_state_struct *);
|
|
extern int fpu_setup_sigcontext(struct fpucontext *buf);
|
|
extern int fpu_restore_sigcontext(struct fpucontext *buf);
|
|
|
|
static inline void unlazy_fpu(struct task_struct *tsk)
|
|
{
|
|
preempt_disable();
|
|
#ifndef CONFIG_LAZY_SAVE_FPU
|
|
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
|
|
fpu_save(&tsk->thread.fpu_state);
|
|
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
|
|
tsk->thread.uregs->epsw &= ~EPSW_FE;
|
|
}
|
|
#else
|
|
if (fpu_state_owner == tsk)
|
|
fpu_save(&tsk->thread.fpu_state);
|
|
#endif
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void exit_fpu(struct task_struct *tsk)
|
|
{
|
|
#ifdef CONFIG_LAZY_SAVE_FPU
|
|
preempt_disable();
|
|
if (fpu_state_owner == tsk)
|
|
fpu_state_owner = NULL;
|
|
preempt_enable();
|
|
#endif
|
|
}
|
|
|
|
static inline void flush_fpu(void)
|
|
{
|
|
struct task_struct *tsk = current;
|
|
|
|
preempt_disable();
|
|
#ifndef CONFIG_LAZY_SAVE_FPU
|
|
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
|
|
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
|
|
tsk->thread.uregs->epsw &= ~EPSW_FE;
|
|
}
|
|
#else
|
|
if (fpu_state_owner == tsk) {
|
|
fpu_state_owner = NULL;
|
|
tsk->thread.uregs->epsw &= ~EPSW_FE;
|
|
}
|
|
#endif
|
|
preempt_enable();
|
|
clear_using_fpu(tsk);
|
|
}
|
|
|
|
#else /* CONFIG_FPU */
|
|
|
|
extern asmlinkage
|
|
void unexpected_fpu_exception(struct pt_regs *, enum exception_code);
|
|
#define fpu_exception unexpected_fpu_exception
|
|
|
|
struct task_struct;
|
|
struct fpu_state_struct;
|
|
static inline bool is_using_fpu(struct task_struct *tsk) { return false; }
|
|
static inline void set_using_fpu(struct task_struct *tsk) {}
|
|
static inline void clear_using_fpu(struct task_struct *tsk) {}
|
|
static inline void fpu_init_state(void) {}
|
|
static inline void fpu_save(struct fpu_state_struct *s) {}
|
|
static inline void fpu_kill_state(struct task_struct *tsk) {}
|
|
static inline void unlazy_fpu(struct task_struct *tsk) {}
|
|
static inline void exit_fpu(struct task_struct *tsk) {}
|
|
static inline void flush_fpu(void) {}
|
|
static inline int fpu_setup_sigcontext(struct fpucontext *buf) { return 0; }
|
|
static inline int fpu_restore_sigcontext(struct fpucontext *buf) { return 0; }
|
|
#endif /* CONFIG_FPU */
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _ASM_FPU_H */
|