1 files changed, 138 insertions, 0 deletions
diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
new file mode 100644
index 00000000000..6cb38d5c040
--- /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 <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 */