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   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 <linux/config.h>
  12 #include <asm/processor.h>
  13 #include <asm/types.h>
  14
  15 struct thread_info {
  16         struct task_struct      *task;          /* main task structure */
  17         struct exec_domain      *exec_domain;   /* execution domain */
  18         unsigned long           flags;          /* low level flags */
  19         __u32                   cpu;            /* current CPU */
  20         __s32                   preempt_count;  /* 0 => preemptable,
  21                                                    <0 => BUG */
  22         mm_segment_t            addr_limit;     /* thread address space:
  23                                                    0-0xBFFFFFFF for user
  24                                                    0-0xFFFFFFFF for kernel */
  25         struct restart_block    restart_block;
  26 };
  27
  28 #define INIT_THREAD_INFO(tsk)                   \
  29 {                                               \
  30         task:           &tsk,                   \
  31         exec_domain:    &default_exec_domain,   \
  32         flags:          0,                      \
  33         cpu:            0,                      \
  34         preempt_count:  1,                      \
  35         addr_limit:     KERNEL_DS,              \
  36         restart_block:  {                       \
  37                 fn:  do_no_restart_syscall,     \
  38         },                                      \
  39 }
  40
  41 #define init_thread_info        (init_thread_union.thread_info)
  42 #define init_stack              (init_thread_union.stack)
  43
  44 /* how to get the thread information struct from C */
  45 static inline struct thread_info *current_thread_info(void)
  46 {
  47         struct thread_info *ti;
  48         unsigned long mask = PAGE_SIZE *
  49                 (1 << CONFIG_KERNEL_STACK_ORDER) - 1;
  50         ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
  51         return ti;
  52 }
  53
  54 /* thread information allocation */
  55 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
  56 #define alloc_thread_info(tsk) \
  57         ((struct thread_info *) kmalloc(THREAD_SIZE, GFP_KERNEL))
  58 #define free_thread_info(ti) kfree(ti)
  59
  60 #define get_thread_info(ti) get_task_struct((ti)->task)
  61 #define put_thread_info(ti) put_task_struct((ti)->task)
  62
  63 #endif
  64
  65 #define PREEMPT_ACTIVE          0x4000000
  66
  67 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  68 #define TIF_SIGPENDING          1       /* signal pending */
  69 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  70 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  71                                          * TIF_NEED_RESCHED
  72                                          */
  73 #define TIF_RESTART_BLOCK       4
  74 #define TIF_MEMDIE              5
  75
  76 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  77 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  78 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  79 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  80 #define _TIF_RESTART_BLOCK      (1 << TIF_RESTART_BLOCK)
  81
  82 #endif
  83
  84 /*
  85  * Overrides for Emacs so that we follow Linus's tabbing style.
  86  * Emacs will notice this stuff at the end of the file and automatically
  87  * adjust the settings for this buffer only.  This must remain at the end
  88  * of the file.
  89  * ---------------------------------------------------------------------------
  90  * Local variables:
  91  * c-file-style: "linux"
  92  * End:
  93  */