arch/openrisc/include/asm/thread_info.h

Source file repositories/reference/linux-study-clean/arch/openrisc/include/asm/thread_info.h

File Facts

System
Linux kernel
Corpus path
arch/openrisc/include/asm/thread_info.h
Extension
.h
Size
3576 bytes
Lines
117
Domain
Architecture Layer
Bucket
arch/openrisc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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 */

	__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 __ASSEMBLER__
#define INIT_THREAD_INFO(tsk)				\
{							\
	.task		= &tsk,				\
	.flags		= 0,				\
	.cpu		= 0,				\
	.preempt_count	= INIT_PREEMPT_COUNT,		\
	.ksp            = 0,                            \
}

/* 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 /* !__ASSEMBLER__ */

/*
 * 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_NOTIFY_SIGNAL	5	/* signal notifications exist */
#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_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
#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 */

Annotation

Implementation Notes