forked from Minki/linux
1da177e4c3
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!
139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 2002 MontaVista Software Inc.
|
|
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
#ifndef _ASM_FPU_H
|
|
#define _ASM_FPU_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/thread_info.h>
|
|
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/cpu-features.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/current.h>
|
|
|
|
struct sigcontext;
|
|
struct sigcontext32;
|
|
|
|
extern asmlinkage int (*save_fp_context)(struct sigcontext *sc);
|
|
extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
|
|
|
|
extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
|
|
extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
|
|
|
|
extern void fpu_emulator_init_fpu(void);
|
|
extern void _init_fpu(void);
|
|
extern void _save_fp(struct task_struct *);
|
|
extern void _restore_fp(struct task_struct *);
|
|
|
|
#if defined(CONFIG_CPU_SB1)
|
|
#define __enable_fpu_hazard() \
|
|
do { \
|
|
asm(".set push \n\t" \
|
|
".set mips64 \n\t" \
|
|
".set noreorder \n\t" \
|
|
"ssnop \n\t" \
|
|
"bnezl $0, .+4 \n\t" \
|
|
"ssnop \n\t" \
|
|
".set pop"); \
|
|
} while (0)
|
|
#else
|
|
#define __enable_fpu_hazard() \
|
|
do { \
|
|
asm("nop;nop;nop;nop"); /* max. hazard */ \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define __enable_fpu() \
|
|
do { \
|
|
set_c0_status(ST0_CU1); \
|
|
__enable_fpu_hazard(); \
|
|
} while (0)
|
|
|
|
#define __disable_fpu() \
|
|
do { \
|
|
clear_c0_status(ST0_CU1); \
|
|
/* We don't care about the c0 hazard here */ \
|
|
} while (0)
|
|
|
|
#define enable_fpu() \
|
|
do { \
|
|
if (cpu_has_fpu) \
|
|
__enable_fpu(); \
|
|
} while (0)
|
|
|
|
#define disable_fpu() \
|
|
do { \
|
|
if (cpu_has_fpu) \
|
|
__disable_fpu(); \
|
|
} while (0)
|
|
|
|
|
|
#define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
|
|
|
|
static inline int is_fpu_owner(void)
|
|
{
|
|
return cpu_has_fpu && test_thread_flag(TIF_USEDFPU);
|
|
}
|
|
|
|
static inline void own_fpu(void)
|
|
{
|
|
if (cpu_has_fpu) {
|
|
__enable_fpu();
|
|
KSTK_STATUS(current) |= ST0_CU1;
|
|
set_thread_flag(TIF_USEDFPU);
|
|
}
|
|
}
|
|
|
|
static inline void lose_fpu(void)
|
|
{
|
|
if (cpu_has_fpu) {
|
|
KSTK_STATUS(current) &= ~ST0_CU1;
|
|
clear_thread_flag(TIF_USEDFPU);
|
|
__disable_fpu();
|
|
}
|
|
}
|
|
|
|
static inline void init_fpu(void)
|
|
{
|
|
if (cpu_has_fpu) {
|
|
_init_fpu();
|
|
} else {
|
|
fpu_emulator_init_fpu();
|
|
}
|
|
}
|
|
|
|
static inline void save_fp(struct task_struct *tsk)
|
|
{
|
|
if (cpu_has_fpu)
|
|
_save_fp(tsk);
|
|
}
|
|
|
|
static inline void restore_fp(struct task_struct *tsk)
|
|
{
|
|
if (cpu_has_fpu)
|
|
_restore_fp(tsk);
|
|
}
|
|
|
|
static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
|
|
{
|
|
if (cpu_has_fpu) {
|
|
if ((tsk == current) && is_fpu_owner())
|
|
_save_fp(current);
|
|
return tsk->thread.fpu.hard.fpr;
|
|
}
|
|
|
|
return tsk->thread.fpu.soft.fpr;
|
|
}
|
|
|
|
#endif /* _ASM_FPU_H */
|