include/asm-s390/thread_info.h

   1 /*
   2  *  include/asm-s390/thread_info.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) IBM Corp. 2002,2006
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   7  */
   8
   9 #ifndef _ASM_THREAD_INFO_H
  10 #define _ASM_THREAD_INFO_H
  11
  12 #ifdef __KERNEL__
  13
  14 /*
  15  * Size of kernel stack for each process
  16  */
  17 #ifndef __s390x__
  18 #ifndef __SMALL_STACK
  19 #define THREAD_ORDER 1
  20 #define ASYNC_ORDER  1
  21 #else
  22 #define THREAD_ORDER 0
  23 #define ASYNC_ORDER  0
  24 #endif
  25 #else /* __s390x__ */
  26 #ifndef __SMALL_STACK
  27 #define THREAD_ORDER 2
  28 #define ASYNC_ORDER  2
  29 #else
  30 #define THREAD_ORDER 1
  31 #define ASYNC_ORDER  1
  32 #endif
  33 #endif /* __s390x__ */
  34
  35 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
  36 #define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
  37
  38 #ifndef __ASSEMBLY__
  39 #include <asm/processor.h>
  40 #include <asm/lowcore.h>
  41
  42 /*
  43  * low level task data that entry.S needs immediate access to
  44  * - this struct should fit entirely inside of one cache line
  45  * - this struct shares the supervisor stack pages
  46  * - if the contents of this structure are changed, the assembly constants must also be changed
  47  */
  48 struct thread_info {
  49         struct task_struct      *task;          /* main task structure */
  50         struct exec_domain      *exec_domain;   /* execution domain */
  51         unsigned long           flags;          /* low level flags */
  52         unsigned int            cpu;            /* current CPU */
  53         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  54         struct restart_block    restart_block;
  55 };
  56
  57 /*
  58  * macros/functions for gaining access to the thread information structure
  59  */
  60 #define INIT_THREAD_INFO(tsk)                   \
  61 {                                               \
  62         .task           = &tsk,                 \
  63         .exec_domain    = &default_exec_domain, \
  64         .flags          = 0,                    \
  65         .cpu            = 0,                    \
  66         .preempt_count  = 1,                    \
  67         .restart_block  = {                     \
  68                 .fn = do_no_restart_syscall,    \
  69         },                                      \
  70 }
  71
  72 #define init_thread_info        (init_thread_union.thread_info)
  73 #define init_stack              (init_thread_union.stack)
  74
  75 /* how to get the thread information struct from C */
  76 static inline struct thread_info *current_thread_info(void)
  77 {
  78         return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
  79 }
  80
  81 /* thread information allocation */
  82 #define alloc_thread_info(tsk) ((struct thread_info *) \
  83         __get_free_pages(GFP_KERNEL,THREAD_ORDER))
  84 #define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER)
  85
  86 #endif
  87
  88 /*
  89  * thread information flags bit numbers
  90  */
  91 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  92 #define TIF_SIGPENDING          2       /* signal pending */
  93 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  94 #define TIF_RESTART_SVC         4       /* restart svc with new svc number */
  95 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
  96 #define TIF_SINGLE_STEP         6       /* deliver sigtrap on return to user */
  97 #define TIF_MCCK_PENDING        7       /* machine check handling is pending */
  98 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
  99 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling
 100                                            TIF_NEED_RESCHED */
 101 #define TIF_31BIT               18      /* 32bit process */
 102 #define TIF_MEMDIE              19
 103 #define TIF_RESTORE_SIGMASK     20      /* restore signal mask in do_signal() */
 104
 105 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 106 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 107 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 108 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 109 #define _TIF_RESTART_SVC        (1<<TIF_RESTART_SVC)
 110 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 111 #define _TIF_SINGLE_STEP        (1<<TIF_SINGLE_STEP)
 112 #define _TIF_MCCK_PENDING       (1<<TIF_MCCK_PENDING)
 113 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 114 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 115 #define _TIF_31BIT              (1<<TIF_31BIT)
 116
 117 #endif /* __KERNEL__ */
 118
 119 #define PREEMPT_ACTIVE          0x4000000
 120
 121 #endif /* _ASM_THREAD_INFO_H */