---

yaml
---
r: 181060
b: refs/heads/master
c: 0ea820c
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a3705799e2cc5fb69d88ad6a7f317a8f5597f18d
+refs/heads/master: 0ea820cf9bf58f735ed40ec67947159c4f170012

trunk/arch/sh/include/asm/fpu.h

@@ -2,8 +2,8 @@
 #define __ASM_SH_FPU_H
 
 #ifndef __ASSEMBLY__
-#include <linux/preempt.h>
-#include <asm/ptrace.h>
+
+struct task_struct;
 
 #ifdef CONFIG_SH_FPU
 static inline void release_fpu(struct pt_regs *regs)
@@ -16,22 +16,23 @@ static inline void grab_fpu(struct pt_regs *regs)
 	regs->sr &= ~SR_FD;
 }
 
-struct task_struct;
-
 extern void save_fpu(struct task_struct *__tsk);
-void fpu_state_restore(struct pt_regs *regs);
+extern void restore_fpu(struct task_struct *__tsk);
+extern void fpu_state_restore(struct pt_regs *regs);
+extern void __fpu_state_restore(void);
 #else
-
-#define save_fpu(tsk)		do { } while (0)
-#define release_fpu(regs)	do { } while (0)
-#define grab_fpu(regs)		do { } while (0)
-#define fpu_state_restore(regs)	do { } while (0)
-
+#define save_fpu(tsk)			do { } while (0)
+#define restore_fpu(tsk)		do { } while (0)
+#define release_fpu(regs)		do { } while (0)
+#define grab_fpu(regs)			do { } while (0)
+#define fpu_state_restore(regs)		do { } while (0)
+#define __fpu_state_restore(regs)	do { } while (0)
 #endif
 
 struct user_regset;
 
 extern int do_fpu_inst(unsigned short, struct pt_regs *);
+extern int init_fpu(struct task_struct *);
 
 extern int fpregs_get(struct task_struct *target,
 		      const struct user_regset *regset,
@@ -65,18 +66,6 @@ static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
 	preempt_enable();
 }
 
-static inline int init_fpu(struct task_struct *tsk)
-{
-	if (tsk_used_math(tsk)) {
-		if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
-			unlazy_fpu(tsk, task_pt_regs(tsk));
-		return 0;
-	}
-
-	set_stopped_child_used_math(tsk);
-	return 0;
-}
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_SH_FPU_H */

trunk/arch/sh/include/asm/processor_32.h

@@ -90,11 +90,15 @@ struct sh_fpu_soft_struct {
 	unsigned long entry_pc;
 };
 
-union sh_fpu_union {
-	struct sh_fpu_hard_struct hard;
-	struct sh_fpu_soft_struct soft;
+union thread_xstate {
+	struct sh_fpu_hard_struct hardfpu;
+	struct sh_fpu_soft_struct softfpu;
 };
 
+extern unsigned int xstate_size;
+extern void free_thread_xstate(struct task_struct *);
+extern struct kmem_cache *task_xstate_cachep;
+
 struct thread_struct {
 	/* Saved registers when thread is descheduled */
 	unsigned long sp;
@@ -103,13 +107,13 @@ struct thread_struct {
 	/* Hardware debugging registers */
 	unsigned long ubc_pc;
 
-	/* floating point info */
-	union sh_fpu_union fpu;
-
 #ifdef CONFIG_SH_DSP
 	/* Dsp status information */
 	struct sh_dsp_struct dsp_status;
 #endif
+
+	/* Extended processor state */
+	union thread_xstate *xstate;
 };
 
 /* Count of active tasks with UBC settings */

trunk/arch/sh/include/asm/thread_info.h

@@ -97,6 +97,10 @@ static inline struct thread_info *current_thread_info(void)
 
 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
 extern void free_thread_info(struct thread_info *ti);
+extern void arch_task_cache_init(void);
+#define arch_task_cache_init arch_task_cache_init
+extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
+extern void init_thread_xstate(void);
 
 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 

trunk/arch/sh/kernel/cpu/Makefile

@@ -17,5 +17,7 @@ obj-$(CONFIG_ARCH_SHMOBILE)	+= shmobile/
 
 obj-$(CONFIG_SH_ADC)		+= adc.o
 obj-$(CONFIG_SH_CLK_CPG)	+= clock-cpg.o
+obj-$(CONFIG_SH_FPU)		+= fpu.o
+obj-$(CONFIG_SH_FPU_EMU)	+= fpu.o
 
 obj-y	+= irq/ init.o clock.o hwblk.o

trunk/arch/sh/kernel/cpu/fpu.c

@@ -0,0 +1,82 @@
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <asm/fpu.h>
+
+int init_fpu(struct task_struct *tsk)
+{
+	if (tsk_used_math(tsk)) {
+		if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
+			unlazy_fpu(tsk, task_pt_regs(tsk));
+		return 0;
+	}
+
+	/*
+	 * Memory allocation at the first usage of the FPU and other state.
+	 */
+	if (!tsk->thread.xstate) {
+		tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+						      GFP_KERNEL);
+		if (!tsk->thread.xstate)
+			return -ENOMEM;
+	}
+
+	if (boot_cpu_data.flags & CPU_HAS_FPU) {
+		struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu;
+		memset(fp, 0, xstate_size);
+		fp->fpscr = FPSCR_INIT;
+	} else {
+		struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu;
+		memset(fp, 0, xstate_size);
+		fp->fpscr = FPSCR_INIT;
+	}
+
+	set_stopped_child_used_math(tsk);
+	return 0;
+}
+
+#ifdef CONFIG_SH_FPU
+void __fpu_state_restore(void)
+{
+	struct task_struct *tsk = current;
+
+	restore_fpu(tsk);
+
+	task_thread_info(tsk)->status |= TS_USEDFPU;
+	tsk->fpu_counter++;
+}
+
+void fpu_state_restore(struct pt_regs *regs)
+{
+	struct task_struct *tsk = current;
+
+	if (unlikely(!user_mode(regs))) {
+		printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
+		BUG();
+		return;
+	}
+
+	if (!tsk_used_math(tsk)) {
+		/*
+		 * does a slab alloc which can sleep
+		 */
+		if (init_fpu(tsk)) {
+			/*
+			 * ran out of memory!
+			 */
+			do_group_exit(SIGKILL);
+			return;
+		}
+	}
+
+	grab_fpu(regs);
+
+	__fpu_state_restore();
+}
+
+BUILD_TRAP_HANDLER(fpu_state_restore)
+{
+	TRAP_HANDLER_DECL;
+
+	fpu_state_restore(regs);
+}
+#endif /* CONFIG_SH_FPU */

trunk/arch/sh/kernel/cpu/init.c

@@ -28,18 +28,30 @@
 #include <asm/ubc.h>
 #endif
 
+#ifdef CONFIG_SH_FPU
+#define cpu_has_fpu	1
+#else
+#define cpu_has_fpu	0
+#endif
+
+#ifdef CONFIG_SH_DSP
+#define cpu_has_dsp	1
+#else
+#define cpu_has_dsp	0
+#endif
+
 /*
  * Generic wrapper for command line arguments to disable on-chip
  * peripherals (nofpu, nodsp, and so forth).
  */
-#define onchip_setup(x)				\
-static int x##_disabled __initdata = 0;		\
-						\
-static int __init x##_setup(char *opts)		\
-{						\
-	x##_disabled = 1;			\
-	return 1;				\
-}						\
+#define onchip_setup(x)					\
+static int x##_disabled __initdata = !cpu_has_##x;	\
+							\
+static int __init x##_setup(char *opts)			\
+{							\
+	x##_disabled = 1;				\
+	return 1;					\
+}							\
 __setup("no" __stringify(x), x##_setup);
 
 onchip_setup(fpu);
@@ -207,6 +219,18 @@ static void detect_cache_shape(void)
 		l2_cache_shape = -1; /* No S-cache */
 }
 
+static void __init fpu_init(void)
+{
+	/* Disable the FPU */
+	if (fpu_disabled && (current_cpu_data.flags & CPU_HAS_FPU)) {
+		printk("FPU Disabled\n");
+		current_cpu_data.flags &= ~CPU_HAS_FPU;
+	}
+
+	disable_fpu();
+	clear_used_math();
+}
+
 #ifdef CONFIG_SH_DSP
 static void __init release_dsp(void)
 {
@@ -244,9 +268,17 @@ static void __init dsp_init(void)
 	if (sr & SR_DSP)
 		current_cpu_data.flags |= CPU_HAS_DSP;
 
+	/* Disable the DSP */
+	if (dsp_disabled && (current_cpu_data.flags & CPU_HAS_DSP)) {
+		printk("DSP Disabled\n");
+		current_cpu_data.flags &= ~CPU_HAS_DSP;
+	}
+
 	/* Now that we've determined the DSP status, clear the DSP bit. */
 	release_dsp();
 }
+#else
+static inline void __init dsp_init(void) { }
 #endif /* CONFIG_SH_DSP */
 
 /**
@@ -302,37 +334,21 @@ asmlinkage void __init sh_cpu_init(void)
 		detect_cache_shape();
 	}
 
-	/* Disable the FPU */
-	if (fpu_disabled) {
-		printk("FPU Disabled\n");
-		current_cpu_data.flags &= ~CPU_HAS_FPU;
-	}
-
-	/* FPU initialization */
-	disable_fpu();
-	if ((current_cpu_data.flags & CPU_HAS_FPU)) {
-		current_thread_info()->status &= ~TS_USEDFPU;
-		clear_used_math();
-	}
+	fpu_init();
+	dsp_init();
 
 	/*
 	 * Initialize the per-CPU ASID cache very early, since the
 	 * TLB flushing routines depend on this being setup.
 	 */
 	current_cpu_data.asid_cache = NO_CONTEXT;
 
-#ifdef CONFIG_SH_DSP
-	/* Probe for DSP */
-	dsp_init();
-
-	/* Disable the DSP */
-	if (dsp_disabled) {
-		printk("DSP Disabled\n");
-		current_cpu_data.flags &= ~CPU_HAS_DSP;
-		release_dsp();
-	}
-#endif
-
 	speculative_execution_init();
 	expmask_init();
+
+	/*
+	 * Boot processor to setup the FP and extended state context info.
+	 */
+	if (raw_smp_processor_id() == 0)
+		init_thread_xstate();
 }