ARC: Process-creation/scheduling/idle-loop

Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de>
author: Vineet Gupta <vgupta@synopsys.com> 2013-01-18 04:42:18 -0500
committer: Vineet Gupta <vgupta@synopsys.com> 2013-02-11 09:30:38 -0500
commit: bf90e1eab682dcb79b7765989fb65835ce9d6165 (patch)
tree: cb1bb4364862d878e1d361d371f8392d08f606d7 /arch/arc/include/asm
parent: 4adeefe161a74369e44cc8e663f240ece0470dc3 (diff)
4 files changed, 72 insertions, 6 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 3fccb04e6d93..d76411882481 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -47,6 +47,17 @@
 #define AUX_ITRIGGER            0x40d
 #define AUX_IPULSE              0x415
+/*
+ * Floating Pt Registers
+ * Status regs are read-only (build-time) so need not be saved/restored
+ */
+#define ARC_AUX_FP_STAT         0x300
+#define ARC_AUX_DPFP_1L         0x301
+#define ARC_AUX_DPFP_1H         0x302
+#define ARC_AUX_DPFP_2L         0x303
+#define ARC_AUX_DPFP_2H         0x304
+#define ARC_AUX_DPFP_STAT       0x305
 #ifndef __ASSEMBLY__
 /*
@@ -110,6 +121,15 @@
 #endif
+#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
+/* These DPFP regs need to be saved/restored across ctx-sw */
+struct arc_fpu {
+        struct {
+                unsigned int l, h;
+        } aux_dpfp[2];
+};
+#endif
 #endif /* __ASEMBLY__ */
 #endif /* __KERNEL__ */
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index bf88cfbc9128..860252ec3fa7 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -29,6 +29,9 @@ struct thread_struct {
        unsigned long callee_reg;       /* pointer to callee regs */
        unsigned long fault_address;    /* dbls as brkpt holder as well */
        unsigned long cause_code;       /* Exception Cause Code (ECR) */
+#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
+        struct arc_fpu fpu;
+#endif
 };
 #define INIT_THREAD  {                          \
@@ -54,12 +57,6 @@ unsigned long thread_saved_pc(struct task_struct *t);
 #define cpu_relax()     do { } while (0)
-/*
- * Create a new kernel thread
- */
-extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
 #define copy_segments(tsk, mm)      do { } while (0)
 #define release_segments(mm)        do { } while (0)
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 4c9359477ded..3afadefe335f 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -91,6 +91,14 @@ struct callee_regs {
 #define in_syscall(regs) (((regs->orig_r8) >= 0 && \
                           (regs->orig_r8 <= NR_syscalls)) ? 1 : 0)
+#define current_pt_regs()                                       \
+({                                                              \
+        /* open-coded current_thread_info() */                  \
+        register unsigned long sp asm ("sp");                   \
+        unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
+        (struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1;     \
+})
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */
diff --git a/arch/arc/include/asm/switch_to.h b/arch/arc/include/asm/switch_to.h
new file mode 100644
index 000000000000..1b171ab5fec0
--- /dev/null
+++ b/arch/arc/include/asm/switch_to.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASM_ARC_SWITCH_TO_H
+#define _ASM_ARC_SWITCH_TO_H
+#ifndef __ASSEMBLY__
+#include <linux/sched.h>
+#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
+extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
+#define ARC_FPU_PREV(p, n)      fpu_save_restore(p, n)
+#define ARC_FPU_NEXT(t)
+#else
+#define ARC_FPU_PREV(p, n)
+#define ARC_FPU_NEXT(n)
+#endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
+struct task_struct *__switch_to(struct task_struct *p, struct task_struct *n);
+#define switch_to(prev, next, last)     \
+do {                                    \
+        ARC_FPU_PREV(prev, next);       \
+        last = __switch_to(prev, next);\
+        ARC_FPU_NEXT(next);             \
+        mb();                           \
+} while (0)
+#endif
+#endif
author	Vineet Gupta <vgupta@synopsys.com>	2013-01-18 04:42:18 -0500
committer	Vineet Gupta <vgupta@synopsys.com>	2013-02-11 09:30:38 -0500
commit	bf90e1eab682dcb79b7765989fb65835ce9d6165 (patch)
tree	cb1bb4364862d878e1d361d371f8392d08f606d7 /arch/arc/include/asm
parent	4adeefe161a74369e44cc8e663f240ece0470dc3 (diff)

diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index 3fccb04e6d93..d76411882481 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h
@@ -47,6 +47,17 @@
47	#define AUX_ITRIGGER 0x40d	47	#define AUX_ITRIGGER 0x40d
48	#define AUX_IPULSE 0x415	48	#define AUX_IPULSE 0x415
49		49
		50	/*
		51	* Floating Pt Registers
		52	* Status regs are read-only (build-time) so need not be saved/restored
		53	*/
		54	#define ARC_AUX_FP_STAT 0x300
		55	#define ARC_AUX_DPFP_1L 0x301
		56	#define ARC_AUX_DPFP_1H 0x302
		57	#define ARC_AUX_DPFP_2L 0x303
		58	#define ARC_AUX_DPFP_2H 0x304
		59	#define ARC_AUX_DPFP_STAT 0x305
		60
50	#ifndef __ASSEMBLY__	61	#ifndef __ASSEMBLY__
51		62
52	/*	63	/*
@@ -110,6 +121,15 @@
110		121
111	#endif	122	#endif
112		123
		124	#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
		125	/* These DPFP regs need to be saved/restored across ctx-sw */
		126	struct arc_fpu {
		127	struct {
		128	unsigned int l, h;
		129	} aux_dpfp[2];
		130	};
		131	#endif
		132
113	#endif /* __ASEMBLY__ */	133	#endif /* __ASEMBLY__ */
114		134
115	#endif /* __KERNEL__ */	135	#endif /* __KERNEL__ */


diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h index bf88cfbc9128..860252ec3fa7 100644 --- a/arch/arc/include/asm/processor.h +++ b/arch/arc/include/asm/processor.h
@@ -29,6 +29,9 @@ struct thread_struct {
29	unsigned long callee_reg; /* pointer to callee regs */	29	unsigned long callee_reg; /* pointer to callee regs */
30	unsigned long fault_address; /* dbls as brkpt holder as well */	30	unsigned long fault_address; /* dbls as brkpt holder as well */
31	unsigned long cause_code; /* Exception Cause Code (ECR) */	31	unsigned long cause_code; /* Exception Cause Code (ECR) */
		32	#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
		33	struct arc_fpu fpu;
		34	#endif
32	};	35	};
33		36
34	#define INIT_THREAD { \	37	#define INIT_THREAD { \
@@ -54,12 +57,6 @@ unsigned long thread_saved_pc(struct task_struct *t);
54		57
55	#define cpu_relax() do { } while (0)	58	#define cpu_relax() do { } while (0)
56		59
57	/*
58	* Create a new kernel thread
59	*/
60
61	extern int kernel_thread(int (fn) (void ), void *arg, unsigned long flags);
62
63	#define copy_segments(tsk, mm) do { } while (0)	60	#define copy_segments(tsk, mm) do { } while (0)
64	#define release_segments(mm) do { } while (0)	61	#define release_segments(mm) do { } while (0)
65		62


diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h index 4c9359477ded..3afadefe335f 100644 --- a/arch/arc/include/asm/ptrace.h +++ b/arch/arc/include/asm/ptrace.h
@@ -91,6 +91,14 @@ struct callee_regs {
91	#define in_syscall(regs) (((regs->orig_r8) >= 0 && \	91	#define in_syscall(regs) (((regs->orig_r8) >= 0 && \
92	(regs->orig_r8 <= NR_syscalls)) ? 1 : 0)	92	(regs->orig_r8 <= NR_syscalls)) ? 1 : 0)
93		93
		94	#define current_pt_regs() \
		95	({ \
		96	/* open-coded current_thread_info() */ \
		97	register unsigned long sp asm ("sp"); \
		98	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
		99	(struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1; \
		100	})
		101
94	#endif /* !__ASSEMBLY__ */	102	#endif /* !__ASSEMBLY__ */
95		103
96	#endif /* __KERNEL__ */	104	#endif /* __KERNEL__ */


diff --git a/arch/arc/include/asm/switch_to.h b/arch/arc/include/asm/switch_to.h new file mode 100644 index 000000000000..1b171ab5fec0 --- /dev/null +++ b/arch/arc/include/asm/switch_to.h
@@ -0,0 +1,41 @@
		1	/*
		2	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
		3	*
		4	* This program is free software; you can redistribute it and/or modify
		5	* it under the terms of the GNU General Public License version 2 as
		6	* published by the Free Software Foundation.
		7	*/
		8
		9	#ifndef _ASM_ARC_SWITCH_TO_H
		10	#define _ASM_ARC_SWITCH_TO_H
		11
		12	#ifndef __ASSEMBLY__
		13
		14	#include <linux/sched.h>
		15
		16	#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
		17
		18	extern void fpu_save_restore(struct task_struct p, struct task_struct n);
		19	#define ARC_FPU_PREV(p, n) fpu_save_restore(p, n)
		20	#define ARC_FPU_NEXT(t)
		21
		22	#else
		23
		24	#define ARC_FPU_PREV(p, n)
		25	#define ARC_FPU_NEXT(n)
		26
		27	#endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
		28
		29	struct task_struct __switch_to(struct task_struct p, struct task_struct *n);
		30
		31	#define switch_to(prev, next, last) \
		32	do { \
		33	ARC_FPU_PREV(prev, next); \
		34	last = __switch_to(prev, next);\
		35	ARC_FPU_NEXT(next); \
		36	mb(); \
		37	} while (0)
		38
		39	#endif
		40
		41	#endif