1/* thread_info.h: CRIS low-level thread information
2 *
3 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 *
6 * CRIS port by Axis Communications
7 */
8
9#ifndef _ASM_THREAD_INFO_H
10#define _ASM_THREAD_INFO_H
11
12#ifdef __KERNEL__
13
14#ifndef __ASSEMBLY__
15#include <asm/types.h>
16#include <asm/processor.h>
17#include <arch/thread_info.h>
18#include <asm/segment.h>
19#endif
20
21
22/*
23 * low level task data that entry.S needs immediate access to
24 * - this struct should fit entirely inside of one cache line
25 * - this struct shares the supervisor stack pages
26 * - if the contents of this structure are changed, the assembly constants must also be changed
27 */
28#ifndef __ASSEMBLY__
29struct thread_info {
30	struct task_struct	*task;		/* main task structure */
31	unsigned long		flags;		/* low level flags */
32	__u32			cpu;		/* current CPU */
33	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
34	__u32			tls;		/* TLS for this thread */
35
36	mm_segment_t		addr_limit;	/* thread address space:
37					 	   0-0xBFFFFFFF for user-thead
38						   0-0xFFFFFFFF for kernel-thread
39						*/
40	__u8			supervisor_stack[0];
41};
42
43#endif
44
45/*
46 * macros/functions for gaining access to the thread information structure
47 */
48#ifndef __ASSEMBLY__
49#define INIT_THREAD_INFO(tsk)				\
50{							\
51	.task		= &tsk,				\
52	.flags		= 0,				\
53	.cpu		= 0,				\
54	.preempt_count	= INIT_PREEMPT_COUNT,		\
55	.addr_limit	= KERNEL_DS,			\
56}
57
58#define init_thread_info	(init_thread_union.thread_info)
59
60#endif /* !__ASSEMBLY__ */
61
62/*
63 * thread information flags
64 * - these are process state flags that various assembly files may need to access
65 * - pending work-to-be-done flags are in LSW
66 * - other flags in MSW
67 */
68#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
69#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
70#define TIF_SIGPENDING		2	/* signal pending */
71#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
72#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
73#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
74
75#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
76#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
77#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
78#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
79
80#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
81#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
82
83#endif /* __KERNEL__ */
84
85#endif /* _ASM_THREAD_INFO_H */
86