include/asm-s390/thread_info.h

   1 /*
   2  *  include/asm-s390/thread_info.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
   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 #ifndef __ASSEMBLY__
  15 #include <asm/processor.h>
  16 #include <asm/lowcore.h>
  17
  18 /*
  19  * low level task data that entry.S needs immediate access to
  20  * - this struct should fit entirely inside of one cache line
  21  * - this struct shares the supervisor stack pages
  22  * - if the contents of this structure are changed, the assembly constants must also be changed
  23  */
  24 struct thread_info {
  25         struct task_struct      *task;          /* main task structure */
  26         struct exec_domain      *exec_domain;   /* execution domain */
  27         unsigned long           flags;          /* low level flags */
  28         unsigned int            cpu;            /* current CPU */
  29         unsigned int            preempt_count; /* 0 => preemptable */
  30         struct restart_block    restart_block;
  31 };
  32
  33 /*
  34  * macros/functions for gaining access to the thread information structure
  35  */
  36 #define INIT_THREAD_INFO(tsk)                   \
  37 {                                               \
  38         .task           = &tsk,                 \
  39         .exec_domain    = &default_exec_domain, \
  40         .flags          = 0,                    \
  41         .cpu            = 0,                    \
  42         .restart_block  = {                     \
  43                 .fn = do_no_restart_syscall,    \
  44         },                                      \
  45 }
  46
  47 #define init_thread_info        (init_thread_union.thread_info)
  48 #define init_stack              (init_thread_union.stack)
  49
  50 /*
  51  * Size of kernel stack for each process
  52  */
  53 #ifndef __s390x__
  54 #define THREAD_ORDER 1
  55 #define ASYNC_ORDER  1
  56 #else /* __s390x__ */
  57 #define THREAD_ORDER 2
  58 #define ASYNC_ORDER  2
  59 #endif /* __s390x__ */
  60
  61 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
  62 #define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
  63
  64 /* how to get the thread information struct from C */
  65 static inline struct thread_info *current_thread_info(void)
  66 {
  67         return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
  68 }
  69
  70 /* thread information allocation */
  71 #define alloc_thread_info(tsk) ((struct thread_info *) \
  72         __get_free_pages(GFP_KERNEL,THREAD_ORDER))
  73 #define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER)
  74 #define get_thread_info(ti) get_task_struct((ti)->task)
  75 #define put_thread_info(ti) put_task_struct((ti)->task)
  76
  77 #endif
  78
  79 /*
  80  * thread information flags bit numbers
  81  */
  82 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  83 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  84 #define TIF_SIGPENDING          2       /* signal pending */
  85 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  86 #define TIF_RESTART_SVC         4       /* restart svc with new svc number */
  87 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
  88 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling
  89                                            TIF_NEED_RESCHED */
  90 #define TIF_31BIT               18      /* 32bit process */
  91
  92 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  93 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  94 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  95 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  96 #define _TIF_RESTART_SVC        (1<<TIF_RESTART_SVC)
  97 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
  98 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  99 #define _TIF_31BIT              (1<<TIF_31BIT)
 100
 101 #endif /* __KERNEL__ */
 102
 103 #define PREEMPT_ACTIVE          0x4000000
 104
 105 #endif /* _ASM_THREAD_INFO_H */