arch/microblaze/include/asm/thread_info.h

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

File Facts

System
Linux kernel
Corpus path
arch/microblaze/include/asm/thread_info.h
Extension
.h
Size
3844 bytes
Lines
144
Domain
Architecture Layer
Bucket
arch/microblaze
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 cpu_context {
	__u32	r1; /* stack pointer */
	__u32	r2;
	/* dedicated registers */
	__u32	r13;
	__u32	r14;
	__u32	r15;
	__u32	r16;
	__u32	r17;
	__u32	r18;
	/* non-volatile registers */
	__u32	r19;
	__u32	r20;
	__u32	r21;
	__u32	r22;
	__u32	r23;
	__u32	r24;
	__u32	r25;
	__u32	r26;
	__u32	r27;
	__u32	r28;
	__u32	r29;
	__u32	r30;
	/* r31 is used as current task pointer */
	/* special purpose registers */
	__u32	msr;
	__u32	ear;
	__u32	esr;
	__u32	fsr;
};

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

	struct cpu_context	cpu_context;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
}

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	register unsigned long sp asm("r1");

	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}

/* thread information allocation */
#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 */
/* restore singlestep on return to user mode */
#define TIF_SINGLESTEP		4
#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
#define TIF_MEMDIE		6	/* is terminating due to OOM killer */
#define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
#define TIF_SECCOMP		10      /* secure computing */

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

#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)

Annotation

Implementation Notes