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Release 4.8 arch/arm64/include/asm/thread_info.h

Directory: arch/arm64/include/asm
/*
 * Based on arch/arm/include/asm/thread_info.h
 *
 * Copyright (C) 2002 Russell King.
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_THREAD_INFO_H

#define __ASM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>

#ifdef CONFIG_ARM64_4K_PAGES

#define THREAD_SIZE_ORDER	2
#elif defined(CONFIG_ARM64_16K_PAGES)

#define THREAD_SIZE_ORDER	0
#endif


#define THREAD_SIZE		16384

#define THREAD_START_SP		(THREAD_SIZE - 16)

#ifndef __ASSEMBLY__

struct task_struct;

#include <asm/types.h>


typedef unsigned long mm_segment_t;

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */

struct thread_info {
	
unsigned long		flags;		/* low level flags */
	
mm_segment_t		addr_limit;	/* address limit */
	
struct task_struct	*task;		/* main task structure */
	
int			preempt_count;	/* 0 => preemptable, <0 => bug */
	
int			cpu;		/* cpu */
};


#define INIT_THREAD_INFO(tsk)						\
{                                                                       \
        .task           = &tsk,                                         \
        .flags          = 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)

/*
 * how to get the current stack pointer from C
 */
register unsigned long current_stack_pointer asm ("sp");

/*
 * how to get the thread information struct from C
 */
static inline struct thread_info *current_thread_info(void) __attribute_const__;

/*
 * struct thread_info can be accessed directly via sp_el0.
 */



static inline struct thread_info *current_thread_info(void)
{
	unsigned long sp_el0;

	asm ("mrs %0, sp_el0" : "=r" (sp_el0));

	return (struct thread_info *)sp_el0;
}


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#define thread_saved_pc(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.pc))

#define thread_saved_sp(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.sp))

#define thread_saved_fp(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.fp))

#endif

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE   - syscall trace active
 *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
 *  TIF_SYSCALL_AUDIT   - syscall auditing
 *  TIF_SECOMP          - syscall secure computing
 *  TIF_SIGPENDING      - signal pending
 *  TIF_NEED_RESCHED    - rescheduling necessary
 *  TIF_NOTIFY_RESUME   - callback before returning to user
 *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 */

#define TIF_SIGPENDING		0

#define TIF_NEED_RESCHED	1

#define TIF_NOTIFY_RESUME	2	
/* callback before returning to user */

#define TIF_FOREIGN_FPSTATE	3	
/* CPU's FP state is not current's */

#define TIF_NOHZ		7

#define TIF_SYSCALL_TRACE	8

#define TIF_SYSCALL_AUDIT	9

#define TIF_SYSCALL_TRACEPOINT	10

#define TIF_SECCOMP		11

#define TIF_MEMDIE		18	
/* is terminating due to OOM killer */

#define TIF_FREEZE		19

#define TIF_RESTORE_SIGMASK	20

#define TIF_SINGLESTEP		21

#define TIF_32BIT		22	
/* 32bit process */


#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)

#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)

#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)

#define _TIF_NOHZ		(1 << TIF_NOHZ)

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)

#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)

#define _TIF_SECCOMP		(1 << TIF_SECCOMP)

#define _TIF_32BIT		(1 << TIF_32BIT)


#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
                                 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)


#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
                                 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
                                 _TIF_NOHZ)

#endif /* __KERNEL__ */
#endif /* __ASM_THREAD_INFO_H */

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behan websterbehan webster103.48%19.09%


ard biesheuvelard biesheuvel103.48%19.09%


larry bassellarry bassel93.14%19.09%


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feng kanfeng kan20.70%19.09%


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Total287100.00%11100.00%

  
Directory: arch/arm64/include/asm



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