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1 /* thread_info.h: description
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * Derived from include/asm-i386/thread_info.h
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #ifndef _ASM_THREAD_INFO_H
14 #define _ASM_THREAD_INFO_H
19 #include <asm/processor.h>
22 #define THREAD_SIZE 8192
25 * low level task data that entry.S needs immediate access to
26 * - this struct should fit entirely inside of one cache line
27 * - this struct shares the supervisor stack pages
28 * - if the contents of this structure are changed, the assembly constants must also be changed
33 struct task_struct
*task
; /* main task structure */
34 struct exec_domain
*exec_domain
; /* execution domain */
35 unsigned long flags
; /* low level flags */
36 unsigned long status
; /* thread-synchronous flags */
37 __u32 cpu
; /* current CPU */
38 int preempt_count
; /* 0 => preemptable, <0 => BUG */
40 mm_segment_t addr_limit
; /* thread address space:
41 * 0-0xBFFFFFFF for user-thead
42 * 0-0xFFFFFFFF for kernel-thread
45 __u8 supervisor_stack
[0];
48 #else /* !__ASSEMBLY__ */
50 #include <asm/asm-offsets.h>
55 * macros/functions for gaining access to the thread information structure
59 #define INIT_THREAD_INFO(tsk) \
62 .exec_domain = &default_exec_domain, \
65 .preempt_count = INIT_PREEMPT_COUNT, \
66 .addr_limit = KERNEL_DS, \
69 #define init_thread_info (init_thread_union.thread_info)
70 #define init_stack (init_thread_union.stack)
72 /* how to get the thread information struct from C */
73 register struct thread_info
*__current_thread_info
asm("gr15");
75 #define current_thread_info() ({ __current_thread_info; })
77 #endif /* __ASSEMBLY__ */
80 * thread information flags
81 * - these are process state flags that various assembly files may need to access
82 * - pending work-to-be-done flags are in LSW
83 * - other flags in MSW
85 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
86 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
87 #define TIF_SIGPENDING 2 /* signal pending */
88 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
89 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
90 #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
91 #define TIF_MEMDIE 7 /* is terminating due to OOM killer */
93 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
94 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
95 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
96 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
97 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
99 /* work to do on interrupt/exception return */
100 #define _TIF_WORK_MASK \
101 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_SINGLESTEP)
103 /* work to do on any return to u-space */
104 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
106 #if _TIF_ALLWORK_MASK >= 0x2000
107 #error "_TIF_ALLWORK_MASK won't fit in an ANDI now (see entry.S)"
111 * Thread-synchronous status.
113 * This is different from the flags in that nobody else
114 * ever touches our thread-synchronous status, so we don't
115 * have to worry about atomic accesses.
117 #define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */
119 #endif /* __KERNEL__ */
121 #endif /* _ASM_THREAD_INFO_H */