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 000000000000..8a3ef247659a
--- /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 */