1/*
2 * Copyright 2004-2010 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef _ASM_THREAD_INFO_H
8#define _ASM_THREAD_INFO_H
9
10#include <asm/page.h>
11#include <asm/entry.h>
12#include <asm/l1layout.h>
13#include <linux/compiler.h>
14
15#ifdef __KERNEL__
16
17/* Thread Align Mask to reach to the top of the stack
18 * for any process
19 */
20#define ALIGN_PAGE_MASK		0xffffe000
21
22/*
23 * Size of kernel stack for each process. This must be a power of 2...
24 */
25#define THREAD_SIZE_ORDER	1
26#define THREAD_SIZE		8192	/* 2 pages */
27#define STACK_WARN		(THREAD_SIZE/8)
28
29#ifndef __ASSEMBLY__
30
31typedef unsigned long mm_segment_t;
32
33/*
34 * low level task data.
35 * If you change this, change the TI_* offsets below to match.
36 */
37
38struct thread_info {
39	struct task_struct *task;	/* main task structure */
40	unsigned long flags;	/* low level flags */
41	int cpu;		/* cpu we're on */
42	int preempt_count;	/* 0 => preemptable, <0 => BUG */
43	mm_segment_t addr_limit;	/* address limit */
44#ifndef CONFIG_SMP
45	struct l1_scratch_task_info l1_task_info;
46#endif
47};
48
49/*
50 * macros/functions for gaining access to the thread information structure
51 */
52#define INIT_THREAD_INFO(tsk)			\
53{						\
54	.task		= &tsk,			\
55	.flags		= 0,			\
56	.cpu		= 0,			\
57	.preempt_count	= INIT_PREEMPT_COUNT,	\
58}
59#define init_thread_info	(init_thread_union.thread_info)
60#define init_stack		(init_thread_union.stack)
61
62/* Given a task stack pointer, you can find its corresponding
63 * thread_info structure just by masking it to the THREAD_SIZE
64 * boundary (currently 8K as you can see above).
65 */
66__attribute_const__
67static inline struct thread_info *current_thread_info(void)
68{
69	struct thread_info *ti;
70	__asm__("%0 = sp;" : "=da"(ti));
71	return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
72}
73
74#endif				/* __ASSEMBLY__ */
75
76/*
77 * thread information flag bit numbers
78 */
79#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
80#define TIF_SIGPENDING		1	/* signal pending */
81#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
82#define TIF_MEMDIE		4	/* is terminating due to OOM killer */
83#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
84#define TIF_IRQ_SYNC		7	/* sync pipeline stage */
85#define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
86#define TIF_SINGLESTEP		9
87
88/* as above, but as bit values */
89#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
90#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
91#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
92#define _TIF_IRQ_SYNC		(1<<TIF_IRQ_SYNC)
93#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
94#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
95
96#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
97
98#endif				/* __KERNEL__ */
99
100#endif				/* _ASM_THREAD_INFO_H */
101