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Linux/arch/frv/include/asm/thread_info.h

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  1 /* thread_info.h: description
  2  *
  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
  6  *
  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.
 11  */
 12 
 13 #ifndef _ASM_THREAD_INFO_H
 14 #define _ASM_THREAD_INFO_H
 15 
 16 #ifdef __KERNEL__
 17 
 18 #ifndef __ASSEMBLY__
 19 #include <asm/processor.h>
 20 #endif
 21 
 22 #define THREAD_SIZE             8192
 23 
 24 /*
 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
 29  */
 30 #ifndef __ASSEMBLY__
 31 
 32 struct thread_info {
 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 */
 39 
 40         mm_segment_t            addr_limit;     /* thread address space:
 41                                                  * 0-0xBFFFFFFF for user-thead
 42                                                  * 0-0xFFFFFFFF for kernel-thread
 43                                                  */
 44 
 45         __u8                    supervisor_stack[0];
 46 };
 47 
 48 #else /* !__ASSEMBLY__ */
 49 
 50 #include <asm/asm-offsets.h>
 51 
 52 #endif
 53 
 54 /*
 55  * macros/functions for gaining access to the thread information structure
 56  */
 57 #ifndef __ASSEMBLY__
 58 
 59 #define INIT_THREAD_INFO(tsk)                   \
 60 {                                               \
 61         .task           = &tsk,                 \
 62         .exec_domain    = &default_exec_domain, \
 63         .flags          = 0,                    \
 64         .cpu            = 0,                    \
 65         .preempt_count  = INIT_PREEMPT_COUNT,   \
 66         .addr_limit     = KERNEL_DS,            \
 67 }
 68 
 69 #define init_thread_info        (init_thread_union.thread_info)
 70 #define init_stack              (init_thread_union.stack)
 71 
 72 /* how to get the thread information struct from C */
 73 register struct thread_info *__current_thread_info asm("gr15");
 74 
 75 #define current_thread_info() ({ __current_thread_info; })
 76 
 77 #endif /* __ASSEMBLY__ */
 78 
 79 /*
 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
 84  */
 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 */
 92 
 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)
 98 
 99 /* work to do on interrupt/exception return */
100 #define _TIF_WORK_MASK          \
101         (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_SINGLESTEP)
102 
103 /* work to do on any return to u-space */
104 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
105 
106 #if _TIF_ALLWORK_MASK >= 0x2000
107 #error "_TIF_ALLWORK_MASK won't fit in an ANDI now (see entry.S)"
108 #endif
109 
110 /*
111  * Thread-synchronous status.
112  *
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.
116  */
117 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
118 
119 #endif /* __KERNEL__ */
120 
121 #endif /* _ASM_THREAD_INFO_H */
122 

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