1/*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#ifndef __ASM_AVR32_THREAD_INFO_H
9#define __ASM_AVR32_THREAD_INFO_H
10
11#include <asm/page.h>
12
13#define THREAD_SIZE_ORDER	1
14#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
15
16#ifndef __ASSEMBLY__
17#include <asm/types.h>
18
19struct task_struct;
20struct exec_domain;
21
22struct thread_info {
23	struct task_struct	*task;		/* main task structure */
24	struct exec_domain	*exec_domain;	/* execution domain */
25	unsigned long		flags;		/* low level flags */
26	__u32			cpu;
27	__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */
28	struct restart_block	restart_block;
29	__u8			supervisor_stack[0];
30};
31
32#define INIT_THREAD_INFO(tsk)						\
33{									\
34	.task		= &tsk,						\
35	.exec_domain	= &default_exec_domain,				\
36	.flags		= 0,						\
37	.cpu		= 0,						\
38	.preempt_count	= 1,						\
39	.restart_block	= {						\
40		.fn	= do_no_restart_syscall				\
41	}								\
42}
43
44#define init_thread_info	(init_thread_union.thread_info)
45#define init_stack		(init_thread_union.stack)
46
47/*
48 * Get the thread information struct from C.
49 * We do the usual trick and use the lower end of the stack for this
50 */
51static inline struct thread_info *current_thread_info(void)
52{
53	unsigned long addr = ~(THREAD_SIZE - 1);
54
55	asm("and %0, sp" : "=r"(addr) : "0"(addr));
56	return (struct thread_info *)addr;
57}
58
59/* thread information allocation */
60#define alloc_thread_info(ti) \
61	((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
62#define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
63#define get_thread_info(ti) get_task_struct((ti)->task)
64#define put_thread_info(ti) put_task_struct((ti)->task)
65
66#endif /* !__ASSEMBLY__ */
67
68#define PREEMPT_ACTIVE		0x40000000
69
70/*
71 * Thread information flags
72 * - these are process state flags that various assembly files may need to access
73 * - pending work-to-be-done flags are in LSW
74 * - other flags in MSW
75 */
76#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
77#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
78#define TIF_SIGPENDING          2       /* signal pending */
79#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
80#define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
81					   TIF_NEED_RESCHED */
82#define TIF_BREAKPOINT		5	/* true if we should break after return */
83#define TIF_SINGLE_STEP		6	/* single step after next break */
84#define TIF_MEMDIE		7
85#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal */
86#define TIF_CPU_GOING_TO_SLEEP	9	/* CPU is entering sleep 0 mode */
87#define TIF_USERSPACE		31      /* true if FS sets userspace */
88
89#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
90#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
91#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
92#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
93#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
94#define _TIF_BREAKPOINT		(1 << TIF_BREAKPOINT)
95#define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
96#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
97#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
98#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
99
100/* work to do on interrupt/exception return */
101#define _TIF_WORK_MASK		0x0000013e
102/* work to do on any return to userspace */
103#define _TIF_ALLWORK_MASK	0x0000013f
104/* work to do on return from debug mode */
105#define _TIF_DBGWORK_MASK	0x0000017e
106
107#endif /* __ASM_AVR32_THREAD_INFO_H */
108