arch/frv/include/asm/thread_info.h

   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         unsigned long           flags;          /* low level flags */
  35         unsigned long           status;         /* thread-synchronous flags */
  36         __u32                   cpu;            /* current CPU */
  37         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  38
  39         mm_segment_t            addr_limit;     /* thread address space:
  40                                                  * 0-0xBFFFFFFF for user-thead
  41                                                  * 0-0xFFFFFFFF for kernel-thread
  42                                                  */
  43
  44         __u8                    supervisor_stack[0];
  45 };
  46
  47 #else /* !__ASSEMBLY__ */
  48
  49 #include <asm/asm-offsets.h>
  50
  51 #endif
  52
  53 /*
  54  * macros/functions for gaining access to the thread information structure
  55  */
  56 #ifndef __ASSEMBLY__
  57
  58 #define INIT_THREAD_INFO(tsk)                   \
  59 {                                               \
  60         .task           = &tsk,                 \
  61         .flags          = 0,                    \
  62         .cpu            = 0,                    \
  63         .preempt_count  = INIT_PREEMPT_COUNT,   \
  64         .addr_limit     = KERNEL_DS,            \
  65 }
  66
  67 #define init_thread_info        (init_thread_union.thread_info)
  68 #define init_stack              (init_thread_union.stack)
  69
  70 /* how to get the thread information struct from C */
  71 register struct thread_info *__current_thread_info asm("gr15");
  72
  73 #define current_thread_info() ({ __current_thread_info; })
  74
  75 #endif /* __ASSEMBLY__ */
  76
  77 /*
  78  * thread information flags
  79  * - these are process state flags that various assembly files may need to access
  80  * - pending work-to-be-done flags are in LSW
  81  * - other flags in MSW
  82  */
  83 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  84 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  85 #define TIF_SIGPENDING          2       /* signal pending */
  86 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  87 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
  88 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  89 #define TIF_MEMDIE              7       /* is terminating due to OOM killer */
  90
  91 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  92 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  93 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  94 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  95 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
  96
  97 /* work to do on interrupt/exception return */
  98 #define _TIF_WORK_MASK          \
  99         (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_SINGLESTEP)
 100
 101 /* work to do on any return to u-space */
 102 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 103
 104 #if _TIF_ALLWORK_MASK >= 0x2000
 105 #error "_TIF_ALLWORK_MASK won't fit in an ANDI now (see entry.S)"
 106 #endif
 107
 108 /*
 109  * Thread-synchronous status.
 110  *
 111  * This is different from the flags in that nobody else
 112  * ever touches our thread-synchronous status, so we don't
 113  * have to worry about atomic accesses.
 114  */
 115 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
 116
 117 #endif /* __KERNEL__ */
 118
 119 #endif /* _ASM_THREAD_INFO_H */