Linux kernel mirror (for testing)
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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;
20
21struct thread_info {
22 struct task_struct *task; /* main task structure */
23 unsigned long flags; /* low level flags */
24 __u32 cpu;
25 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */
26 __u32 rar_saved; /* return address... */
27 __u32 rsr_saved; /* ...and status register
28 saved by debug handler
29 when setting up
30 trampoline */
31 __u8 supervisor_stack[0];
32};
33
34#define INIT_THREAD_INFO(tsk) \
35{ \
36 .task = &tsk, \
37 .flags = 0, \
38 .cpu = 0, \
39 .preempt_count = INIT_PREEMPT_COUNT, \
40}
41
42#define init_thread_info (init_thread_union.thread_info)
43#define init_stack (init_thread_union.stack)
44
45/*
46 * Get the thread information struct from C.
47 * We do the usual trick and use the lower end of the stack for this
48 */
49static inline struct thread_info *current_thread_info(void)
50{
51 unsigned long addr = ~(THREAD_SIZE - 1);
52
53 asm("and %0, sp" : "=r"(addr) : "0"(addr));
54 return (struct thread_info *)addr;
55}
56
57#define get_thread_info(ti) get_task_struct((ti)->task)
58#define put_thread_info(ti) put_task_struct((ti)->task)
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_SIGPENDING 1 /* signal pending */
70#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
71#define TIF_BREAKPOINT 4 /* enter monitor mode on return */
72#define TIF_SINGLE_STEP 5 /* single step in progress */
73#define TIF_MEMDIE 6 /* is terminating due to OOM killer */
74#define TIF_RESTORE_SIGMASK 7 /* restore signal mask in do_signal */
75#define TIF_CPU_GOING_TO_SLEEP 8 /* CPU is entering sleep 0 mode */
76#define TIF_NOTIFY_RESUME 9 /* callback before returning to user */
77#define TIF_DEBUG 30 /* debugging enabled */
78#define TIF_USERSPACE 31 /* true if FS sets userspace */
79
80#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
81#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
82#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
83#define _TIF_BREAKPOINT (1 << TIF_BREAKPOINT)
84#define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP)
85#define _TIF_MEMDIE (1 << TIF_MEMDIE)
86#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
87#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
88
89/* Note: The masks below must never span more than 16 bits! */
90
91/* work to do on interrupt/exception return */
92#define _TIF_WORK_MASK \
93 (_TIF_SIGPENDING \
94 | _TIF_NOTIFY_RESUME \
95 | _TIF_NEED_RESCHED \
96 | _TIF_BREAKPOINT)
97
98/* work to do on any return to userspace */
99#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
100/* work to do on return from debug mode */
101#define _TIF_DBGWORK_MASK (_TIF_WORK_MASK & ~_TIF_BREAKPOINT)
102
103#endif /* __ASM_AVR32_THREAD_INFO_H */