mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
0b6249567b
Move FPU hazard handling to hazards.h and provide proper support for MIPSR2 processors Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
152 lines
3.0 KiB
C
152 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/sched.h>
|
|
#include <linux/thread_info.h>
|
|
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/cpu-features.h>
|
|
#include <asm/hazards.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/current.h>
|
|
|
|
#ifdef CONFIG_MIPS_MT_FPAFF
|
|
#include <asm/mips_mt.h>
|
|
#endif
|
|
|
|
struct sigcontext;
|
|
struct sigcontext32;
|
|
|
|
extern asmlinkage int (*save_fp_context)(struct sigcontext __user *sc);
|
|
extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);
|
|
|
|
extern asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc);
|
|
extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *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 *);
|
|
|
|
#define __enable_fpu() \
|
|
do { \
|
|
set_c0_status(ST0_CU1); \
|
|
enable_fpu_hazard(); \
|
|
} while (0)
|
|
|
|
#define __disable_fpu() \
|
|
do { \
|
|
clear_c0_status(ST0_CU1); \
|
|
disable_fpu_hazard(); \
|
|
} 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 test_thread_flag(TIF_USEDFPU);
|
|
}
|
|
|
|
static inline int is_fpu_owner(void)
|
|
{
|
|
return cpu_has_fpu && __is_fpu_owner();
|
|
}
|
|
|
|
static inline void __own_fpu(void)
|
|
{
|
|
__enable_fpu();
|
|
KSTK_STATUS(current) |= ST0_CU1;
|
|
set_thread_flag(TIF_USEDFPU);
|
|
}
|
|
|
|
static inline void own_fpu_inatomic(int restore)
|
|
{
|
|
if (cpu_has_fpu && !__is_fpu_owner()) {
|
|
__own_fpu();
|
|
if (restore)
|
|
_restore_fp(current);
|
|
}
|
|
}
|
|
|
|
static inline void own_fpu(int restore)
|
|
{
|
|
preempt_disable();
|
|
own_fpu_inatomic(restore);
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void lose_fpu(int save)
|
|
{
|
|
preempt_disable();
|
|
if (is_fpu_owner()) {
|
|
if (save)
|
|
_save_fp(current);
|
|
KSTK_STATUS(current) &= ~ST0_CU1;
|
|
clear_thread_flag(TIF_USEDFPU);
|
|
__disable_fpu();
|
|
}
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void init_fpu(void)
|
|
{
|
|
preempt_disable();
|
|
if (cpu_has_fpu) {
|
|
__own_fpu();
|
|
_init_fpu();
|
|
} else {
|
|
fpu_emulator_init_fpu();
|
|
}
|
|
preempt_enable();
|
|
}
|
|
|
|
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 (tsk == current) {
|
|
preempt_disable();
|
|
if (is_fpu_owner())
|
|
_save_fp(current);
|
|
preempt_enable();
|
|
}
|
|
|
|
return tsk->thread.fpu.fpr;
|
|
}
|
|
|
|
#endif /* _ASM_FPU_H */
|