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   1 #ifndef _ASM_M68K_THREAD_INFO_H
   2 #define _ASM_M68K_THREAD_INFO_H
   3
   4 #include <asm/types.h>
   5 #include <asm/page.h>
   6
   7 struct thread_info {
   8         struct task_struct      *task;          /* main task structure */
   9         unsigned long           flags;
  10         struct exec_domain      *exec_domain;   /* execution domain */
  11         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  12         __u32 cpu; /* should always be 0 on m68k */
  13         struct restart_block    restart_block;
  14 };
  15
  16 #define PREEMPT_ACTIVE          0x4000000
  17
  18 #define INIT_THREAD_INFO(tsk)                   \
  19 {                                               \
  20         .task           = &tsk,                 \
  21         .exec_domain    = &default_exec_domain, \
  22         .restart_block = {                      \
  23                 .fn = do_no_restart_syscall,    \
  24         },                                      \
  25 }
  26
  27 /* THREAD_SIZE should be 8k, so handle differently for 4k and 8k machines */
  28 #if PAGE_SHIFT == 13 /* 8k machines */
  29 #define alloc_thread_info(tsk)   ((struct thread_info *)__get_free_pages(GFP_KERNEL,0))
  30 #define free_thread_info(ti)  free_pages((unsigned long)(ti),0)
  31 #else /* otherwise assume 4k pages */
  32 #define alloc_thread_info(tsk)   ((struct thread_info *)__get_free_pages(GFP_KERNEL,1))
  33 #define free_thread_info(ti)  free_pages((unsigned long)(ti),1)
  34 #endif /* PAGE_SHIFT == 13 */
  35
  36 #define init_thread_info        (init_task.thread.info)
  37 #define init_stack              (init_thread_union.stack)
  38
  39 #define task_thread_info(tsk)   (&(tsk)->thread.info)
  40 #define task_stack_page(tsk)    ((tsk)->stack)
  41 #define current_thread_info()   task_thread_info(current)
  42
  43 #define __HAVE_THREAD_FUNCTIONS
  44
  45 #define setup_thread_stack(p, org) ({                   \
  46         *(struct task_struct **)(p)->stack = (p);       \
  47         task_thread_info(p)->task = (p);                \
  48 })
  49
  50 #define end_of_stack(p) ((unsigned long *)(p)->stack + 1)
  51
  52 /* entry.S relies on these definitions!
  53  * bits 0-7 are tested at every exception exit
  54  * bits 8-15 are also tested at syscall exit
  55  */
  56 #define TIF_SIGPENDING          6       /* signal pending */
  57 #define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  58 #define TIF_DELAYED_TRACE       14      /* single step a syscall */
  59 #define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  60 #define TIF_MEMDIE              16
  61
  62 #endif  /* _ASM_M68K_THREAD_INFO_H */