kernel/arch/um/include/asm/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         unsigned long           flags;          /* low level flags */
  18         __u32                   cpu;            /* current CPU */
  19         int                     preempt_count;  /* 0 => preemptable,
  20                                                    <0 => BUG */
  21         mm_segment_t            addr_limit;     /* thread address space:
  22                                                    0-0xBFFFFFFF for user
  23                                                    0-0xFFFFFFFF for kernel */
  24         struct thread_info      *real_thread;    /* Points to non-IRQ stack */
  25 };
  26
  27 #define INIT_THREAD_INFO(tsk)                   \
  28 {                                               \
  29         .task =         &tsk,                   \
  30         .flags =                0,              \
  31         .cpu =          0,                      \
  32         .preempt_count = INIT_PREEMPT_COUNT,    \
  33         .addr_limit =   KERNEL_DS,              \
  34         .real_thread = NULL,                    \
  35 }
  36
  37 #define init_thread_info        (init_thread_union.thread_info)
  38 #define init_stack              (init_thread_union.stack)
  39
  40 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
  41 /* how to get the thread information struct from C */
  42 static inline struct thread_info *current_thread_info(void)
  43 {
  44         struct thread_info *ti;
  45         unsigned long mask = THREAD_SIZE - 1;
  46         void *p;
  47
  48         asm volatile ("" : "=r" (p) : "0" (&ti));
  49         ti = (struct thread_info *) (((unsigned long)p) & ~mask);
  50         return ti;
  51 }
  52
  53 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
  54
  55 #endif
  56
  57 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  58 #define TIF_SIGPENDING          1       /* signal pending */
  59 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  60 #define TIF_RESTART_BLOCK       4
  61 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
  62 #define TIF_SYSCALL_AUDIT       6
  63 #define TIF_RESTORE_SIGMASK     7
  64 #define TIF_NOTIFY_RESUME       8
  65
  66 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  67 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  68 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  69 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  70 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  71
  72 #endif