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/segment.h>
  14 #include <sysdep/ptrace_user.h>
  15
  16 struct thread_info {
  17         struct task_struct      *task;          /* main task structure */
  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 thread_info      *real_thread;    /* Points to non-IRQ stack */
  26         unsigned long aux_fp_regs[FP_SIZE];     /* auxiliary fp_regs to save/restore
  27                                                    them out-of-band */
  28 };
  29
  30 #define INIT_THREAD_INFO(tsk)                   \
  31 {                                               \
  32         .task =         &tsk,                   \
  33         .flags =                0,              \
  34         .cpu =          0,                      \
  35         .preempt_count = INIT_PREEMPT_COUNT,    \
  36         .addr_limit =   KERNEL_DS,              \
  37         .real_thread = NULL,                    \
  38 }
  39
  40 #define init_thread_info        (init_thread_union.thread_info)
  41 #define init_stack              (init_thread_union.stack)
  42
  43 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
  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 = THREAD_SIZE - 1;
  49         void *p;
  50
  51         asm volatile ("" : "=r" (p) : "0" (&ti));
  52         ti = (struct thread_info *) (((unsigned long)p) & ~mask);
  53         return ti;
  54 }
  55
  56 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
  57
  58 #endif
  59
  60 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  61 #define TIF_SIGPENDING          1       /* signal pending */
  62 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  63 #define TIF_RESTART_BLOCK       4
  64 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
  65 #define TIF_SYSCALL_AUDIT       6
  66 #define TIF_RESTORE_SIGMASK     7
  67 #define TIF_NOTIFY_RESUME       8
  68 #define TIF_SECCOMP             9       /* secure computing */
  69
  70 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  71 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  72 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  73 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  74 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  75 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
  76
  77 #endif