1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __UM_THREAD_INFO_H
7#define __UM_THREAD_INFO_H
8
9#ifndef __ASSEMBLY__
10
11#include <asm/processor.h>
12#include <asm/types.h>
13
14struct thread_info {
15	struct task_struct	*task;		/* main task structure */
16	struct exec_domain	*exec_domain;	/* execution domain */
17	unsigned long		flags;		/* low level flags */
18	__u32			cpu;		/* current CPU */
19	int			preempt_count;  /* 0 => preemptable,
20						   <0 => BUG */
21	mm_segment_t		addr_limit;	/* thread address space:
22					 	   0-0xBFFFFFFF for user
23						   0-0xFFFFFFFF for kernel */
24	struct restart_block    restart_block;
25	struct thread_info	*real_thread;    /* Points to non-IRQ stack */
26};
27
28#define INIT_THREAD_INFO(tsk)			\
29{						\
30	.task =		&tsk,			\
31	.exec_domain =	&default_exec_domain,	\
32	.flags =		0,		\
33	.cpu =		0,			\
34	.preempt_count =	1,		\
35	.addr_limit =	KERNEL_DS,		\
36	.restart_block =  {			\
37		.fn =  do_no_restart_syscall,	\
38	},					\
39	.real_thread = NULL,			\
40}
41
42#define init_thread_info	(init_thread_union.thread_info)
43#define init_stack		(init_thread_union.stack)
44
45#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
46/* how to get the thread information struct from C */
47static inline struct thread_info *current_thread_info(void)
48{
49	struct thread_info *ti;
50	unsigned long mask = THREAD_SIZE - 1;
51	ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
52	return ti;
53}
54
55/* thread information allocation */
56#define alloc_thread_info(tsk) \
57	((struct thread_info *) kmalloc(THREAD_SIZE, GFP_KERNEL))
58#define free_thread_info(ti) kfree(ti)
59
60#endif
61
62#define PREEMPT_ACTIVE		0x10000000
63
64#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
65#define TIF_SIGPENDING		1	/* signal pending */
66#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
67#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
68					 * TIF_NEED_RESCHED
69					 */
70#define TIF_RESTART_BLOCK 	4
71#define TIF_MEMDIE	 	5
72#define TIF_SYSCALL_AUDIT	6
73#define TIF_RESTORE_SIGMASK	7
74
75#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
76#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
77#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
78#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
79#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
80#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
81#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
82
83#endif
84