/* * 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 */