Release 4.11 arch/c6x/include/asm/thread_info.h

/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *
 *  Updated for 2.6.3x: Mark Salter <msalter@redhat.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_C6X_THREAD_INFO_H

#define _ASM_C6X_THREAD_INFO_H

#ifdef __KERNEL__

#include <asm/page.h>

#ifdef CONFIG_4KSTACKS

#define THREAD_SIZE		4096

#define THREAD_SHIFT		12

#define THREAD_SIZE_ORDER	0
#else

#define THREAD_SIZE		8192

#define THREAD_SHIFT		13

#define THREAD_SIZE_ORDER	1
#endif


#define THREAD_START_SP		(THREAD_SIZE - 8)

#ifndef __ASSEMBLY__

typedef struct {
	
unsigned long seg;
} 
mm_segment_t;

/*
 * low level task data.
 */

struct thread_info {
	
struct task_struct	*task;		/* main task structure */
	
unsigned long		flags;		/* low level flags */
	
int			cpu;		/* cpu we're on */
	
int			preempt_count;	/* 0 = preemptable, <0 = BUG */
	
mm_segment_t		addr_limit;	/* thread address space */
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */

#define INIT_THREAD_INFO(tsk)			\
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
        .addr_limit     = KERNEL_DS,            \
}


#define init_thread_info	(init_thread_union.thread_info)

#define init_stack		(init_thread_union.stack)

/* get the thread information struct of current task */
static inline __attribute__((const))
struct 
thread_info *current_thread_info(void)
{
        struct thread_info *ti;
	asm volatile (" clr   .s2 B15,0,%1,%0\n"
		      : "=b" (ti)
		      : "Iu5" (THREAD_SHIFT - 1));
	return ti;
}


#define get_thread_info(ti)	get_task_struct((ti)->task)

#define put_thread_info(ti)	put_task_struct((ti)->task)
#endif /* __ASSEMBLY__ */

/*
 * thread information flag bit numbers
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */

#define TIF_SYSCALL_TRACE	0	
/* syscall trace active */

#define TIF_NOTIFY_RESUME	1	
/* resumption notification requested */

#define TIF_SIGPENDING		2	
/* signal pending */

#define TIF_NEED_RESCHED	3	
/* rescheduling necessary */

#define TIF_RESTORE_SIGMASK	4	
/* restore signal mask in do_signal() */


#define TIF_MEMDIE		17	
/* OOM killer killed process */


#define TIF_WORK_MASK		0x00007FFE 
/* work on irq/exception return */

#define TIF_ALLWORK_MASK	0x00007FFF 
/* work on any return to u-space */

#endif /* __KERNEL__ */

#endif /* _ASM_C6X_THREAD_INFO_H */
Overall Contributors
Person
Tokens
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Commits
CommitProp
Aurelien Jacquiot
209
98.58%
1
33.33%
Thomas Gleixner
2
0.94%
1
33.33%
Richard Weinberger
1
0.47%
1
33.33%
Total
212
100.00%
3
100.00%
Directory: arch/c6x/include/asm

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