X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-mips%2Ffpu.h;h=e59d4c039661278a469df9caa5e2a74f6cee1a50;hb=9ac33b2b749e9539e84bbb1a41f97b066c4bd757;hp=efef843b93f0c1694a2084f1a502523a5ac69318;hpb=c45aa055c32b488fc3fd73c760df372b09acf69a;p=linux-2.6-omap-h63xx.git

diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index efef843b93f..e59d4c03966 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -12,11 +12,12 @@
 
 #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/bitops.h>
+#include <asm/hazards.h>
 #include <asm/processor.h>
 #include <asm/current.h>
 
@@ -27,45 +28,27 @@
 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_context)(struct sigcontext __user *sc);
+extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);
 
-extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
-extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *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 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();						\
+        enable_fpu_hazard();						\
 } while (0)
 
 #define __disable_fpu()							\
 do {									\
 	clear_c0_status(ST0_CU1);					\
-	/* We don't care about the c0 hazard here  */			\
+        disable_fpu_hazard();						\
 } while (0)
 
 #define enable_fpu()							\
@@ -93,31 +76,52 @@ static inline int is_fpu_owner(void)
 	return cpu_has_fpu && __is_fpu_owner();
 }
 
-static inline void own_fpu(void)
+static inline void __own_fpu(void)
 {
-	if (cpu_has_fpu) {
-		__enable_fpu();
-		KSTK_STATUS(current) |= ST0_CU1;
-		set_thread_flag(TIF_USEDFPU);
+	__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 lose_fpu(void)
+static inline void own_fpu(int restore)
 {
-	if (cpu_has_fpu) {
+	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)