From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 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! --- include/asm-mips/fpu.h | 138 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 include/asm-mips/fpu.h (limited to 'include/asm-mips/fpu.h') diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h new file mode 100644 index 0000000..6cb38d5 --- /dev/null +++ b/include/asm-mips/fpu.h @@ -0,0 +1,138 @@ +/* + * 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 +#include +#include + +#include +#include +#include +#include +#include +#include + +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 */ -- cgit v1.1