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 #ifndef CONFIG_64BIT
  14 #define THREAD_ORDER 1
  15 #define ASYNC_ORDER  1
  16 #else /* CONFIG_64BIT */
  17 #define THREAD_ORDER 2
  18 #define ASYNC_ORDER  2
  19 #endif /* CONFIG_64BIT */
  20
  21 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
  22 #define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
  23
  24 #ifndef __ASSEMBLY__
  25 #include <asm/lowcore.h>
  26 #include <asm/page.h>
  27 #include <asm/processor.h>
  28
  29 /*
  30  * low level task data that entry.S needs immediate access to
  31  * - this struct should fit entirely inside of one cache line
  32  * - this struct shares the supervisor stack pages
  33  * - if the contents of this structure are changed, the assembly constants must also be changed
  34  */
  35 struct thread_info {
  36         struct task_struct      *task;          /* main task structure */
  37         struct exec_domain      *exec_domain;   /* execution domain */
  38         unsigned long           flags;          /* low level flags */
  39         unsigned long           sys_call_table; /* System call table address */
  40         unsigned int            cpu;            /* current CPU */
  41         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  42         struct restart_block    restart_block;
  43         unsigned int            system_call;
  44         __u64                   user_timer;
  45         __u64                   system_timer;
  46         unsigned long           last_break;     /* last breaking-event-address. */
  47 };
  48
  49 /*
  50  * macros/functions for gaining access to the thread information structure
  51  */
  52 #define INIT_THREAD_INFO(tsk)                   \
  53 {                                               \
  54         .task           = &tsk,                 \
  55         .exec_domain    = &default_exec_domain, \
  56         .flags          = 0,                    \
  57         .cpu            = 0,                    \
  58         .preempt_count  = INIT_PREEMPT_COUNT,   \
  59         .restart_block  = {                     \
  60                 .fn = do_no_restart_syscall,    \
  61         },                                      \
  62 }
  63
  64 #define init_thread_info        (init_thread_union.thread_info)
  65 #define init_stack              (init_thread_union.stack)
  66
  67 /* how to get the thread information struct from C */
  68 static inline struct thread_info *current_thread_info(void)
  69 {
  70         return (struct thread_info *) S390_lowcore.thread_info;
  71 }
  72
  73 #define THREAD_SIZE_ORDER THREAD_ORDER
  74
  75 #endif
  76
  77 /*
  78  * thread information flags bit numbers
  79  */
  80 #define TIF_SYSCALL             0       /* inside a system call */
  81 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  82 #define TIF_SIGPENDING          2       /* signal pending */
  83 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  84 #define TIF_PER_TRAP            6       /* deliver sigtrap on return to user */
  85 #define TIF_MCCK_PENDING        7       /* machine check handling is pending */
  86 #define TIF_SYSCALL_TRACE       8       /* syscall trace active */
  87 #define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
  88 #define TIF_SECCOMP             10      /* secure computing */
  89 #define TIF_SYSCALL_TRACEPOINT  11      /* syscall tracepoint instrumentation */
  90 #define TIF_31BIT               17      /* 32bit process */
  91 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
  92 #define TIF_RESTORE_SIGMASK     19      /* restore signal mask in do_signal() */
  93 #define TIF_SINGLE_STEP         20      /* This task is single stepped */
  94
  95 #define _TIF_SYSCALL            (1<<TIF_SYSCALL)
  96 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  97 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  98 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  99 #define _TIF_PER_TRAP           (1<<TIF_PER_TRAP)
 100 #define _TIF_MCCK_PENDING       (1<<TIF_MCCK_PENDING)
 101 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 102 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 103 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 104 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 105 #define _TIF_31BIT              (1<<TIF_31BIT)
 106 #define _TIF_SINGLE_STEP        (1<<TIF_SINGLE_STEP)
 107
 108 #ifdef CONFIG_64BIT
 109 #define is_32bit_task()         (test_thread_flag(TIF_31BIT))
 110 #else
 111 #define is_32bit_task()         (1)
 112 #endif
 113
 114 #define PREEMPT_ACTIVE          0x4000000
 115
 116 #endif /* _ASM_THREAD_INFO_H */