include/asm-um/thread_info.h

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __UM_THREAD_INFO_H
   7 #define __UM_THREAD_INFO_H
   8
   9 #ifndef __ASSEMBLY__
  10
  11 #include <asm/processor.h>
  12
  13 struct thread_info {
  14         struct task_struct      *task;          /* main task structure */
  15         struct exec_domain      *exec_domain;   /* execution domain */
  16         unsigned long           flags;          /* low level flags */
  17         __u32                   cpu;            /* current CPU */
  18         __s32                   preempt_count;  /* 0 => preemptable,
  19                                                    <0 => BUG */
  20         mm_segment_t            addr_limit;     /* thread address space:
  21                                                    0-0xBFFFFFFF for user
  22                                                    0-0xFFFFFFFF for kernel */
  23         struct restart_block    restart_block;
  24 };
  25
  26 #define INIT_THREAD_INFO(tsk)                   \
  27 {                                               \
  28         task:           &tsk,                   \
  29         exec_domain:    &default_exec_domain,   \
  30         flags:          0,                      \
  31         cpu:            0,                      \
  32         preempt_count:  1,                      \
  33         addr_limit:     KERNEL_DS,              \
  34         restart_block:  {                       \
  35                 fn:  do_no_restart_syscall,     \
  36         },                                      \
  37 }
  38
  39 #define init_thread_info        (init_thread_union.thread_info)
  40 #define init_stack              (init_thread_union.stack)
  41
  42 /* how to get the thread information struct from C */
  43 static inline struct thread_info *current_thread_info(void)
  44 {
  45         struct thread_info *ti;
  46         __asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~16383UL));
  47         return ti;
  48 }
  49
  50 /* thread information allocation */
  51 #define THREAD_SIZE (4*PAGE_SIZE)
  52 #define alloc_thread_info(tsk) ((struct thread_info *) \
  53         __get_free_pages(GFP_KERNEL,2))
  54 #define free_thread_info(ti) free_pages((unsigned long) (ti), 2)
  55 #define get_thread_info(ti) get_task_struct((ti)->task)
  56 #define put_thread_info(ti) put_task_struct((ti)->task)
  57
  58 #endif
  59
  60 #define PREEMPT_ACTIVE          0x4000000
  61
  62 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  63 #define TIF_SIGPENDING          1       /* signal pending */
  64 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  65 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  66                                          * TIF_NEED_RESCHED
  67                                          */
  68
  69 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  70 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  71 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  72 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  73
  74 #endif
  75
  76 /*
  77  * Overrides for Emacs so that we follow Linus's tabbing style.
  78  * Emacs will notice this stuff at the end of the file and automatically
  79  * adjust the settings for this buffer only.  This must remain at the end
  80  * of the file.
  81  * ---------------------------------------------------------------------------
  82  * Local variables:
  83  * c-file-style: "linux"
  84  * End:
  85  */