cregit-Linux how code gets into the kernel

Release 4.14 arch/openrisc/include/asm/thread_info.h

/*
 * OpenRISC Linux
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * OpenRISC implementation:
 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 * et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef _ASM_THREAD_INFO_H

#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/types.h>
#include <asm/processor.h>
#endif


/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
 * normally, the stack is found by doing something like p + THREAD_SIZE
 * in or32, a page is 8192 bytes, which seems like a sane size
 */


#define THREAD_SIZE_ORDER 0

#define THREAD_SIZE       (PAGE_SIZE << THREAD_SIZE_ORDER)

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *   must also be changed
 */
#ifndef __ASSEMBLY__


typedef unsigned long mm_segment_t;


struct thread_info {
	
struct task_struct	*task;		/* main task structure */
	
unsigned long		flags;		/* low level flags */
	
__u32			cpu;		/* current CPU */
	
__s32			preempt_count; /* 0 => preemptable, <0 => BUG */

	
mm_segment_t		addr_limit; /* thread address space:
                                               0-0x7FFFFFFF for user-thead
                                               0-0xFFFFFFFF for kernel-thread
                                             */
	
__u8			supervisor_stack[0];

	/* saved context data */
	
unsigned long           ksp;
};
#endif

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

#define INIT_THREAD_INFO(tsk)				\
{                                                       \
        .task           = &tsk,                         \
        .flags          = 0,                            \
        .cpu            = 0,                            \
        .preempt_count  = 1,                            \
        .addr_limit     = KERNEL_DS,                    \
        .ksp            = 0,                            \
}


#define init_thread_info	(init_thread_union.thread_info)

/* how to get the thread information struct from C */
register struct thread_info *current_thread_info_reg asm("r10");

#define current_thread_info()   (current_thread_info_reg)


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

#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* !__ASSEMBLY__ */

/*
 * thread information flags
 *   these are process state flags that various assembly files may need to
 *   access
 *   - 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_SINGLESTEP		4	
/* restore singlestep on return to user
                                         * mode
                                         */

#define TIF_SYSCALL_TRACEPOINT  8       
/* for ftrace syscall instrumentation */

#define TIF_RESTORE_SIGMASK     9

#define TIF_POLLING_NRFLAG	16	
/* true if poll_idle() is polling                                                * TIF_NEED_RESCHED
                                         */

#define TIF_MEMDIE              17


#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)


/* Work to do when returning from interrupt/exception */
/* For OpenRISC, this is anything in the LSW other than syscall trace */

#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Jonas Bonn20899.52%150.00%
Richard Weinberger10.48%150.00%
Total209100.00%2100.00%
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