arch/m68k/include/asm/thread_info.h

   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 #include <asm/segment.h>
   7
   8 /*
   9  * On machines with 4k pages we default to an 8k thread size, though we
  10  * allow a 4k with config option. Any other machine page size then
  11  * the thread size must match the page size (which is 8k and larger here).
  12  */
  13 #if PAGE_SHIFT < 13
  14 #ifdef CONFIG_4KSTACKS
  15 #define THREAD_SIZE     4096
  16 #else
  17 #define THREAD_SIZE     8192
  18 #endif
  19 #else
  20 #define THREAD_SIZE     PAGE_SIZE
  21 #endif
  22 #define THREAD_SIZE_ORDER       ((THREAD_SIZE / PAGE_SIZE) - 1)
  23
  24 #ifndef __ASSEMBLY__
  25
  26 struct thread_info {
  27         struct task_struct      *task;          /* main task structure */
  28         unsigned long           flags;
  29         mm_segment_t            addr_limit;     /* thread address space */
  30         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  31         __u32                   cpu;            /* should always be 0 on m68k */
  32         unsigned long           tp_value;       /* thread pointer */
  33 };
  34 #endif /* __ASSEMBLY__ */
  35
  36 #define INIT_THREAD_INFO(tsk)                   \
  37 {                                               \
  38         .task           = &tsk,                 \
  39         .addr_limit     = KERNEL_DS,            \
  40         .preempt_count  = INIT_PREEMPT_COUNT,   \
  41 }
  42
  43 #define init_stack              (init_thread_union.stack)
  44
  45 #ifndef __ASSEMBLY__
  46 /* how to get the thread information struct from C */
  47 static inline struct thread_info *current_thread_info(void)
  48 {
  49         struct thread_info *ti;
  50         __asm__(
  51                 "move.l %%sp, %0 \n\t"
  52                 "and.l  %1, %0"
  53                 : "=&d"(ti)
  54                 : "di" (~(THREAD_SIZE-1))
  55                 );
  56         return ti;
  57 }
  58 #endif
  59
  60 #define init_thread_info        (init_thread_union.thread_info)
  61
  62 /* entry.S relies on these definitions!
  63  * bits 0-7 are tested at every exception exit
  64  * bits 8-15 are also tested at syscall exit
  65  */
  66 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  67 #define TIF_SIGPENDING          6       /* signal pending */
  68 #define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  69 #define TIF_DELAYED_TRACE       14      /* single step a syscall */
  70 #define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  71 #define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  72 #define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  73
  74 #endif  /* _ASM_M68K_THREAD_INFO_H */