include/asm-um/thread_info.h

   1 /*
   2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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/types.h>
  12 #include <asm/page.h>
  13 #include <asm/uaccess.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         int                     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         struct thread_info      *real_thread;    /* Points to non-IRQ stack */
  27 };
  28
  29 #define INIT_THREAD_INFO(tsk)                   \
  30 {                                               \
  31         .task =         &tsk,                   \
  32         .exec_domain =  &default_exec_domain,   \
  33         .flags =                0,              \
  34         .cpu =          0,                      \
  35         .preempt_count =        1,              \
  36         .addr_limit =   KERNEL_DS,              \
  37         .restart_block =  {                     \
  38                 .fn =  do_no_restart_syscall,   \
  39         },                                      \
  40         .real_thread = NULL,                    \
  41 }
  42
  43 #define init_thread_info        (init_thread_union.thread_info)
  44 #define init_stack              (init_thread_union.stack)
  45
  46 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
  47 /* how to get the thread information struct from C */
  48 static inline struct thread_info *current_thread_info(void)
  49 {
  50         struct thread_info *ti;
  51         unsigned long mask = THREAD_SIZE - 1;
  52         ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
  53         return ti;
  54 }
  55
  56 #ifdef CONFIG_DEBUG_STACK_USAGE
  57
  58 #define alloc_thread_info(tsk) \
  59         ((struct thread_info *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, \
  60                                                  CONFIG_KERNEL_STACK_ORDER))
  61 #else
  62
  63 /* thread information allocation */
  64 #define alloc_thread_info(tsk) \
  65         ((struct thread_info *) __get_free_pages(GFP_KERNEL, \
  66                                                  CONFIG_KERNEL_STACK_ORDER))
  67 #endif
  68
  69 #define free_thread_info(ti) \
  70         free_pages((unsigned long)(ti),CONFIG_KERNEL_STACK_ORDER)
  71
  72 #endif
  73
  74 #define PREEMPT_ACTIVE          0x10000000
  75
  76 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  77 #define TIF_SIGPENDING          1       /* signal pending */
  78 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  79 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  80                                          * TIF_NEED_RESCHED
  81                                          */
  82 #define TIF_RESTART_BLOCK       4
  83 #define TIF_MEMDIE              5
  84 #define TIF_SYSCALL_AUDIT       6
  85 #define TIF_RESTORE_SIGMASK     7
  86
  87 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  88 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  89 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  90 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  91 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  92 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  93 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
  94
  95 #endif