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        struct exec_domain      *exec_domain;   /* execution domain */
  32        unsigned long           flags;          /* low level flags */
  33        __u32                   cpu;            /* current CPU */
  34        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  35        __u32                   tls;            /* TLS for this thread */
  36
  37        mm_segment_t            addr_limit;     /* thread address space:
  38                                                   0-0xBFFFFFFF for user-thead
  39                                                   0-0xFFFFFFFF for kernel-thread
  40                                                */
  41        struct restart_block    restart_block;
  42        __u8                    supervisor_stack[0];
  43};
  44
  45#endif
  46
  47#define PREEMPT_ACTIVE          0x10000000
  48
  49/*
  50 * macros/functions for gaining access to the thread information structure
  51 */
  52#ifndef __ASSEMBLY__
  53#define INIT_THREAD_INFO(tsk)                           \
  54{                                                       \
  55        .task           = &tsk,                         \
  56        .exec_domain    = &default_exec_domain,         \
  57        .flags          = 0,                            \
  58        .cpu            = 0,                            \
  59        .preempt_count  = INIT_PREEMPT_COUNT,           \
  60        .addr_limit     = KERNEL_DS,                    \
  61        .restart_block = {                              \
  62                       .fn = do_no_restart_syscall,     \
  63        },                                              \
  64}
  65
  66#define init_thread_info        (init_thread_union.thread_info)
  67
  68#endif /* !__ASSEMBLY__ */
  69
  70/*
  71 * thread information flags
  72 * - these are process state flags that various assembly files may need to access
  73 * - pending work-to-be-done flags are in LSW
  74 * - other flags in MSW
  75 */
  76#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  77#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  78#define TIF_SIGPENDING          2       /* signal pending */
  79#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  80#define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  81#define TIF_MEMDIE              17      /* is terminating due to OOM killer */
  82
  83#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  84#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  85#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  86#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  87
  88#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  89#define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
  90
  91#endif /* __KERNEL__ */
  92
  93#endif /* _ASM_THREAD_INFO_H */
  94