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