cregit-Linux how code gets into the kernel

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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_SCORE_THREAD_INFO_H

#define _ASM_SCORE_THREAD_INFO_H

#ifdef __KERNEL__


#define KU_MASK	0x08

#define KU_USER	0x08

#define KU_KERN	0x00

#include <asm/page.h>
#include <linux/const.h>

/* thread information allocation */

#define THREAD_SIZE_ORDER	(1)

#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#define THREAD_MASK		(THREAD_SIZE - _AC(1,UL))

#ifndef __ASSEMBLY__

#include <asm/processor.h>

/*
 * 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
 */

struct thread_info {
	
struct task_struct	*task;		/* main task structure */
	
unsigned long		flags;		/* low level flags */
	
unsigned long		tp_value;	/* thread pointer */
	
__u32			cpu;		/* current CPU */

	/* 0 => preemptable, < 0 => BUG */
	
int			preempt_count;

	/*
         * thread address space:
         * 0-0xBFFFFFFF for user-thead
         * 0-0xFFFFFFFF for kernel-thread
         */
	
mm_segment_t		addr_limit;
	
struct pt_regs		*regs;
};

/*
 * 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,                 \
        .cpu            = 0,                    \
        .preempt_count  = 1,                    \
        .addr_limit     = KERNEL_DS,            \
}


#define init_thread_info	(init_thread_union.thread_info)

#define init_stack		(init_thread_union.stack)

/* How to get the thread information struct from C. */
register struct thread_info *__current_thread_info __asm__("r28");

#define current_thread_info()	__current_thread_info

#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_SIGPENDING		1	
/* signal pending */

#define TIF_NEED_RESCHED	2	
/* rescheduling necessary */

#define TIF_NOTIFY_RESUME	5	
/* callback before returning to user */

#define TIF_RESTORE_SIGMASK	9	
/* restore signal mask in do_signal() */

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


#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)


#define _TIF_WORK_MASK		(0x0000ffff)

#endif /* __KERNEL__ */

#endif /* _ASM_SCORE_THREAD_INFO_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Chen Liqin15787.71%233.33%
Tim Abbott1910.61%116.67%
Andreas Dilger10.56%116.67%
Richard Weinberger10.56%116.67%
Greg Kroah-Hartman10.56%116.67%
Total179100.00%6100.00%
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