Commit bf90e1ea authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: Process-creation/scheduling/idle-loop 



Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
parent 4adeefe1

arch/arc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ config ARC 
	select GENERIC_FIND_FIRST_BIT

	# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP

	select GENERIC_IRQ_SHOW

	select GENERIC_KERNEL_EXECVE

	select GENERIC_KERNEL_THREAD

	select GENERIC_PENDING_IRQ if SMP

	select GENERIC_SMP_IDLE_THREAD

	select HAVE_GENERIC_HARDIRQS

arch/arc/include/asm/arcregs.h

+20 −0
Original line number Diff line number Diff line
@@ -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__ */

arch/arc/include/asm/processor.h

+3 −6
Original line number Diff line number Diff line
@@ -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)

arch/arc/include/asm/ptrace.h

+8 −0
Original line number Diff line number Diff line
@@ -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__ */

arch/arc/include/asm/switch_to.h

0 → 100644
+41 −0
Original line number Diff line number Diff line 
/*

 * 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