diff options
author | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 09:20:26 -0700 |
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committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 09:20:26 -0700 |
commit | 651dab4264e4ba0e563f5ff56f748127246e9065 (patch) | |
tree | 016630974bdcb00fe529b673f96d389e0fd6dc94 /arch/mips/include/asm/fpu.h | |
parent | 40b8606253552109815786e5d4b0de98782d31f5 (diff) | |
parent | 2e532d68a2b3e2aa6b19731501222069735c741c (diff) |
Merge commit 'linus/master' into merge-linus
Conflicts:
arch/x86/kvm/i8254.c
Diffstat (limited to 'arch/mips/include/asm/fpu.h')
-rw-r--r-- | arch/mips/include/asm/fpu.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/mips/include/asm/fpu.h b/arch/mips/include/asm/fpu.h new file mode 100644 index 00000000000..8a3ef247659 --- /dev/null +++ b/arch/mips/include/asm/fpu.h @@ -0,0 +1,153 @@ +/* + * 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 <linux/bitops.h> + +#include <asm/mipsregs.h> +#include <asm/cpu.h> +#include <asm/cpu-features.h> +#include <asm/hazards.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 int fpu_emulator_save_context(struct sigcontext __user *sc); +extern int fpu_emulator_restore_context(struct sigcontext __user *sc); +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 */ |