arch/cris/include/asm/thread_info.h

   1 /* thread_info.h: CRIS low-level thread information
   2  *
   3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   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         unsigned long           flags;          /* low level flags */
  32         __u32                   cpu;            /* current CPU */
  33         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  34         __u32                   tls;            /* TLS for this thread */
  35
  36         mm_segment_t            addr_limit;     /* thread address space:
  37                                                    0-0xBFFFFFFF for user-thead
  38                                                    0-0xFFFFFFFF for kernel-thread
  39                                                 */
  40         __u8                    supervisor_stack[0];
  41 };
  42
  43 #endif
  44
  45 /*
  46  * macros/functions for gaining access to the thread information structure
  47  */
  48 #ifndef __ASSEMBLY__
  49 #define INIT_THREAD_INFO(tsk)                           \
  50 {                                                       \
  51         .task           = &tsk,                         \
  52         .flags          = 0,                            \
  53         .cpu            = 0,                            \
  54         .preempt_count  = INIT_PREEMPT_COUNT,           \
  55         .addr_limit     = KERNEL_DS,                    \
  56 }
  57
  58 #define init_thread_info        (init_thread_union.thread_info)
  59
  60 #endif /* !__ASSEMBLY__ */
  61
  62 /*
  63  * thread information flags
  64  * - these are process state flags that various assembly files may need to access
  65  * - pending work-to-be-done flags are in LSW
  66  * - other flags in MSW
  67  */
  68 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  69 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  70 #define TIF_SIGPENDING          2       /* signal pending */
  71 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  72 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  73 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
  74
  75 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  76 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  77 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  78 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  79
  80 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  81 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
  82
  83 #endif /* __KERNEL__ */
  84
  85 #endif /* _ASM_THREAD_INFO_H */