arch/s390/include/asm/thread_info.h

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 2002, 2006
   4  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   5  */
   6
   7 #ifndef _ASM_THREAD_INFO_H
   8 #define _ASM_THREAD_INFO_H
   9
  10 /*
  11  * Size of kernel stack for each process
  12  */
  13 #define THREAD_ORDER 2
  14 #define ASYNC_ORDER  2
  15
  16 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
  17 #define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
  18
  19 #ifndef __ASSEMBLY__
  20 #include <asm/lowcore.h>
  21 #include <asm/page.h>
  22 #include <asm/processor.h>
  23
  24 /*
  25  * low level task data that entry.S needs immediate access to
  26  * - this struct should fit entirely inside of one cache line
  27  * - this struct shares the supervisor stack pages
  28  * - if the contents of this structure are changed, the assembly constants must also be changed
  29  */
  30 struct thread_info {
  31         struct task_struct      *task;          /* main task structure */
  32         unsigned long           flags;          /* low level flags */
  33         unsigned long           sys_call_table; /* System call table address */
  34         unsigned int            cpu;            /* current CPU */
  35         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  36         unsigned int            system_call;
  37         __u64                   user_timer;
  38         __u64                   system_timer;
  39         unsigned long           last_break;     /* last breaking-event-address. */
  40 };
  41
  42 /*
  43  * macros/functions for gaining access to the thread information structure
  44  */
  45 #define INIT_THREAD_INFO(tsk)                   \
  46 {                                               \
  47         .task           = &tsk,                 \
  48         .flags          = 0,                    \
  49         .cpu            = 0,                    \
  50         .preempt_count  = INIT_PREEMPT_COUNT,   \
  51 }
  52
  53 #define init_thread_info        (init_thread_union.thread_info)
  54 #define init_stack              (init_thread_union.stack)
  55
  56 /* how to get the thread information struct from C */
  57 static inline struct thread_info *current_thread_info(void)
  58 {
  59         return (struct thread_info *) S390_lowcore.thread_info;
  60 }
  61
  62 void arch_release_task_struct(struct task_struct *tsk);
  63
  64 #define THREAD_SIZE_ORDER THREAD_ORDER
  65
  66 #endif
  67
  68 /*
  69  * thread information flags bit numbers
  70  */
  71 #define TIF_NOTIFY_RESUME       0       /* callback before returning to user */
  72 #define TIF_SIGPENDING          1       /* signal pending */
  73 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  74 #define TIF_SYSCALL_TRACE       3       /* syscall trace active */
  75 #define TIF_SYSCALL_AUDIT       4       /* syscall auditing active */
  76 #define TIF_SECCOMP             5       /* secure computing */
  77 #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
  78 #define TIF_UPROBE              7       /* breakpointed or single-stepping */
  79 #define TIF_31BIT               16      /* 32bit process */
  80 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
  81 #define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal() */
  82 #define TIF_SINGLE_STEP         19      /* This task is single stepped */
  83 #define TIF_BLOCK_STEP          20      /* This task is block stepped */
  84 #define TIF_UPROBE_SINGLESTEP   21      /* This task is uprobe single stepped */
  85
  86 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  87 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  88 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  89 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  90 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
  91 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
  92 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
  93 #define _TIF_UPROBE             (1<<TIF_UPROBE)
  94 #define _TIF_31BIT              (1<<TIF_31BIT)
  95 #define _TIF_SINGLE_STEP        (1<<TIF_SINGLE_STEP)
  96
  97 #define is_32bit_task()         (test_thread_flag(TIF_31BIT))
  98
  99 #endif /* _ASM_THREAD_INFO_H */