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;
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 __u32 rar_saved; /* return address... */
29 __u32 rsr_saved; /* ...and status register
30 saved by debug handler
31 when setting up
32 trampoline */
33 struct restart_block restart_block;
34 __u8 supervisor_stack[0];
35};
36
37#define INIT_THREAD_INFO(tsk) \
38{ \
39 .task = &tsk, \
40 .exec_domain = &default_exec_domain, \
41 .flags = 0, \
42 .cpu = 0, \
43 .preempt_count = 1, \
44 .restart_block = { \
45 .fn = do_no_restart_syscall \
46 } \
47}
48
49#define init_thread_info (init_thread_union.thread_info)
50#define init_stack (init_thread_union.stack)
51
52/*
53 * Get the thread information struct from C.
54 * We do the usual trick and use the lower end of the stack for this
55 */
56static inline struct thread_info *current_thread_info(void)
57{
58 unsigned long addr = ~(THREAD_SIZE - 1);
59
60 asm("and %0, sp" : "=r"(addr) : "0"(addr));
61 return (struct thread_info *)addr;
62}
63
64/* thread information allocation */
65#define alloc_thread_info(ti) \
66 ((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
67#define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
68#define get_thread_info(ti) get_task_struct((ti)->task)
69#define put_thread_info(ti) put_task_struct((ti)->task)
70
71#endif /* !__ASSEMBLY__ */
72
73#define PREEMPT_ACTIVE 0x40000000
74
75/*
76 * Thread information flags
77 * - these are process state flags that various assembly files may need to access
78 * - pending work-to-be-done flags are in LSW
79 * - other flags in MSW
80 */
81#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
82#define TIF_SIGPENDING 1 /* signal pending */
83#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
84#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
85 TIF_NEED_RESCHED */
86#define TIF_BREAKPOINT 4 /* enter monitor mode on return */
87#define TIF_SINGLE_STEP 5 /* single step in progress */
88#define TIF_MEMDIE 6
89#define TIF_RESTORE_SIGMASK 7 /* restore signal mask in do_signal */
90#define TIF_CPU_GOING_TO_SLEEP 8 /* CPU is entering sleep 0 mode */
91#define TIF_DEBUG 30 /* debugging enabled */
92#define TIF_USERSPACE 31 /* true if FS sets userspace */
93
94#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
95#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
96#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
97#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
98#define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP)
99#define _TIF_MEMDIE (1 << TIF_MEMDIE)
100#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
101#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
102
103/* Note: The masks below must never span more than 16 bits! */
104
105/* work to do on interrupt/exception return */
106#define _TIF_WORK_MASK \
107 ((1 << TIF_SIGPENDING) \
108 | (1 << TIF_NEED_RESCHED) \
109 | (1 << TIF_POLLING_NRFLAG) \
110 | (1 << TIF_BREAKPOINT) \
111 | (1 << TIF_RESTORE_SIGMASK))
112
113/* work to do on any return to userspace */
114#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE))
115/* work to do on return from debug mode */
116#define _TIF_DBGWORK_MASK (_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))
117
118#endif /* __ASM_AVR32_THREAD_INFO_H */