LXR linux/arch/cris/include/asm/thread

   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__
  29struct 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 */
  86