[mirror_ubuntu-artful-kernel.git] / arch / avr32 / include / asm / switch_to.h

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * 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_AVR32_SWITCH_TO_H
#define __ASM_AVR32_SWITCH_TO_H

/*
 * Help PathFinder and other Nexus-compliant debuggers keep track of
 * the current PID by emitting an Ownership Trace Message each time we
 * switch task.
 */
#ifdef CONFIG_OWNERSHIP_TRACE
#include <asm/ocd.h>
#define ocd_switch(prev, next)				\
	do {						\
		ocd_write(PID, prev->pid);		\
		ocd_write(PID, next->pid);		\
	} while(0)
#else
#define ocd_switch(prev, next)
#endif

/*
 * switch_to(prev, next, last) should switch from task `prev' to task
 * `next'. `prev' will never be the same as `next'.
 *
 * We just delegate everything to the __switch_to assembly function,
 * which is implemented in arch/avr32/kernel/switch_to.S
 *
 * mb() tells GCC not to cache `current' across this call.
 */
struct cpu_context;
struct task_struct;
extern struct task_struct *__switch_to(struct task_struct *,
				       struct cpu_context *,
				       struct cpu_context *);
#define switch_to(prev, next, last)					\
	do {								\
		ocd_switch(prev, next);					\
		last = __switch_to(prev, &prev->thread.cpu_context + 1,	\
				   &next->thread.cpu_context);		\
	} while (0)


#endif /* __ASM_AVR32_SWITCH_TO_H */
Commit	Line	Data
ae473946 DH	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	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	#ifndef __ASM_AVR32_SWITCH_TO_H
	9	#define __ASM_AVR32_SWITCH_TO_H
	10
	11	/*
	12	* Help PathFinder and other Nexus-compliant debuggers keep track of
	13	* the current PID by emitting an Ownership Trace Message each time we
	14	* switch task.
	15	*/
	16	#ifdef CONFIG_OWNERSHIP_TRACE
	17	#include <asm/ocd.h>
dfdbd597	18	#define ocd_switch(prev, next) \
ae473946 DH	19	do { \
ae473946 DH	20	ocd_write(PID, prev->pid); \
dfdbd597	21	ocd_write(PID, next->pid); \
ae473946	22	} while(0)
dfdbd597 PZ	23	#else
dfdbd597 PZ	24	#define ocd_switch(prev, next)
ae473946 DH	25	#endif
	26
	27	/*
	28	* switch_to(prev, next, last) should switch from task `prev' to task
	29	* `next'. `prev' will never be the same as `next'.
	30	*
	31	* We just delegate everything to the __switch_to assembly function,
	32	* which is implemented in arch/avr32/kernel/switch_to.S
	33	*
	34	* mb() tells GCC not to cache `current' across this call.
	35	*/
	36	struct cpu_context;
	37	struct task_struct;
	38	extern struct task_struct __switch_to(struct task_struct ,
	39	struct cpu_context *,
	40	struct cpu_context *);
	41	#define switch_to(prev, next, last) \
	42	do { \
dfdbd597	43	ocd_switch(prev, next); \
ae473946 DH	44	last = __switch_to(prev, &prev->thread.cpu_context + 1, \
	45	&next->thread.cpu_context); \
	46	} while (0)
	47
	48
	49	#endif /* __ASM_AVR32_SWITCH_TO_H */