include/asm-h8300/thread_info.h

   1 /* thread_info.h: h8300 low-level thread information
   2  * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
   3  *
   4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   6  */
   7
   8 #ifndef _ASM_THREAD_INFO_H
   9 #define _ASM_THREAD_INFO_H
  10
  11 #include <asm/page.h>
  12
  13 #ifdef __KERNEL__
  14
  15 #ifndef __ASSEMBLY__
  16
  17 /*
  18  * low level task data.
  19  * If you change this, change the TI_* offsets below to match.
  20  */
  21 struct thread_info {
  22         struct task_struct *task;               /* main task structure */
  23         struct exec_domain *exec_domain;        /* execution domain */
  24         unsigned long      flags;               /* low level flags */
  25         int                cpu;                 /* cpu we're on */
  26         int                preempt_count;       /* 0 => preemptable, <0 => BUG */
  27         struct restart_block restart_block;
  28 };
  29
  30 /*
  31  * macros/functions for gaining access to the thread information structure
  32  */
  33 #define INIT_THREAD_INFO(tsk)                   \
  34 {                                               \
  35         .task =         &tsk,                   \
  36         .exec_domain =  &default_exec_domain,   \
  37         .flags =        0,                      \
  38         .cpu =          0,                      \
  39         .preempt_count = 1,                     \
  40         .restart_block  = {                     \
  41                 .fn = do_no_restart_syscall,    \
  42         },                                      \
  43 }
  44
  45 #define init_thread_info        (init_thread_union.thread_info)
  46 #define init_stack              (init_thread_union.stack)
  47
  48
  49 /*
  50  * Size of kernel stack for each process. This must be a power of 2...
  51  */
  52 #define THREAD_SIZE             8192    /* 2 pages */
  53
  54
  55 /* how to get the thread information struct from C */
  56 static inline struct thread_info *current_thread_info(void)
  57 {
  58         struct thread_info *ti;
  59         __asm__(
  60                 "mov.l  sp, %0 \n\t"
  61                 "and.l  %1, %0"
  62                 : "=&r"(ti)
  63                 : "i" (~(THREAD_SIZE-1))
  64                 );
  65         return ti;
  66 }
  67
  68 /* thread information allocation */
  69 #define alloc_thread_info(tsk) ((struct thread_info *) \
  70                                 __get_free_pages(GFP_KERNEL, 1))
  71 #define free_thread_info(ti)    free_pages((unsigned long) (ti), 1)
  72 #endif /* __ASSEMBLY__ */
  73
  74 /*
  75  * Offsets in thread_info structure, used in assembly code
  76  */
  77 #define TI_TASK         0
  78 #define TI_EXECDOMAIN   4
  79 #define TI_FLAGS        8
  80 #define TI_CPU          12
  81 #define TI_PRE_COUNT    16
  82
  83 #define PREEMPT_ACTIVE  0x4000000
  84
  85 /*
  86  * thread information flag bit numbers
  87  */
  88 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  89 #define TIF_SIGPENDING          1       /* signal pending */
  90 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  91 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  92                                            TIF_NEED_RESCHED */
  93 #define TIF_MEMDIE              4
  94 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  95
  96 /* as above, but as bit values */
  97 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  98 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  99 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 100 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 101 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 102
 103 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 104
 105 #endif /* __KERNEL__ */
 106
 107 #endif /* _ASM_THREAD_INFO_H */