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Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -07001/*
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_USERSPACE 31 /* true if FS sets userspace */
87
88#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
89#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
90#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
91#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
92#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
93#define _TIF_BREAKPOINT (1 << TIF_BREAKPOINT)
94#define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP)
95#define _TIF_MEMDIE (1 << TIF_MEMDIE)
96#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
97
98/* XXX: These two masks must never span more than 16 bits! */
99/* work to do on interrupt/exception return */
100#define _TIF_WORK_MASK 0x0000013e
101/* work to do on any return to userspace */
102#define _TIF_ALLWORK_MASK 0x0000013f
103/* work to do on return from debug mode */
104#define _TIF_DBGWORK_MASK 0x0000017e
105
106#endif /* __ASM_AVR32_THREAD_INFO_H */