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         struct exec_domain      *exec_domain;   /* execution domain */
  30         mm_segment_t            addr_limit;     /* thread address space */
  31         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  32         __u32                   cpu;            /* should always be 0 on m68k */
  33         unsigned long           tp_value;       /* thread pointer */
  34         struct restart_block    restart_block;
  35 };
  36 #endif /* __ASSEMBLY__ */
  37
  38 #define PREEMPT_ACTIVE          0x4000000
  39
  40 #define INIT_THREAD_INFO(tsk)                   \
  41 {                                               \
  42         .task           = &tsk,                 \
  43         .exec_domain    = &default_exec_domain, \
  44         .addr_limit     = KERNEL_DS,            \
  45         .preempt_count  = INIT_PREEMPT_COUNT,   \
  46         .restart_block = {                      \
  47                 .fn = do_no_restart_syscall,    \
  48         },                                      \
  49 }
  50
  51 #define init_stack              (init_thread_union.stack)
  52
  53 #ifndef __ASSEMBLY__
  54 /* how to get the thread information struct from C */
  55 static inline struct thread_info *current_thread_info(void)
  56 {
  57         struct thread_info *ti;
  58         __asm__(
  59                 "move.l %%sp, %0 \n\t"
  60                 "and.l  %1, %0"
  61                 : "=&d"(ti)
  62                 : "di" (~(THREAD_SIZE-1))
  63                 );
  64         return ti;
  65 }
  66 #endif
  67
  68 #define init_thread_info        (init_thread_union.thread_info)
  69
  70 /* entry.S relies on these definitions!
  71  * bits 0-7 are tested at every exception exit
  72  * bits 8-15 are also tested at syscall exit
  73  */
  74 #define TIF_SIGPENDING          6       /* signal pending */
  75 #define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  76 #define TIF_DELAYED_TRACE       14      /* single step a syscall */
  77 #define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  78 #define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  79 #define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  80
  81 #endif  /* _ASM_M68K_THREAD_INFO_H */