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thread_info.h
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1 /* thread_info.h: CRIS low-level thread information
2  *
3  * Copyright (C) 2002 David Howells ([email protected])
4  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5  *
6  * CRIS port by Axis Communications
7  */
8 
9 #ifndef _ASM_THREAD_INFO_H
10 #define _ASM_THREAD_INFO_H
11 
12 #ifdef __KERNEL__
13 
14 #ifndef __ASSEMBLY__
15 #include <asm/types.h>
16 #include <asm/processor.h>
17 #include <arch/thread_info.h>
18 #include <asm/segment.h>
19 #endif
20 
21 
22 /*
23  * low level task data that entry.S needs immediate access to
24  * - this struct should fit entirely inside of one cache line
25  * - this struct shares the supervisor stack pages
26  * - if the contents of this structure are changed, the assembly constants must also be changed
27  */
28 #ifndef __ASSEMBLY__
29 struct thread_info {
30  struct task_struct *task; /* main task structure */
31  struct exec_domain *exec_domain; /* execution domain */
32  unsigned long flags; /* low level flags */
33  __u32 cpu; /* current CPU */
34  int preempt_count; /* 0 => preemptable, <0 => BUG */
35  __u32 tls; /* TLS for this thread */
36 
37  mm_segment_t addr_limit; /* thread address space:
38  0-0xBFFFFFFF for user-thead
39  0-0xFFFFFFFF for kernel-thread
40  */
43 };
44 
45 #endif
46 
47 #define PREEMPT_ACTIVE 0x10000000
48 
49 /*
50  * macros/functions for gaining access to the thread information structure
51  */
52 #ifndef __ASSEMBLY__
53 #define INIT_THREAD_INFO(tsk) \
54 { \
55  .task = &tsk, \
56  .exec_domain = &default_exec_domain, \
57  .flags = 0, \
58  .cpu = 0, \
59  .preempt_count = INIT_PREEMPT_COUNT, \
60  .addr_limit = KERNEL_DS, \
61  .restart_block = { \
62  .fn = do_no_restart_syscall, \
63  }, \
64 }
65 
66 #define init_thread_info (init_thread_union.thread_info)
67 
68 #endif /* !__ASSEMBLY__ */
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_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
81 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
82 
83 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
84 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
85 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
86 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
87 
88 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
89 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
90 
91 #endif /* __KERNEL__ */
92 
93 #endif /* _ASM_THREAD_INFO_H */