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
   7 /*
   8  * On machines with 4k pages we default to an 8k thread size, though we
   9  * allow a 4k with config option. Any other machine page size then
  10  * the thread size must match the page size (which is 8k and larger here).
  11  */
  12 #if PAGE_SHIFT < 13
  13 #ifdef CONFIG_4KSTACKS
  14 #define THREAD_SIZE     4096
  15 #else
  16 #define THREAD_SIZE     8192
  17 #endif
  18 #else
  19 #define THREAD_SIZE     PAGE_SIZE
  20 #endif
  21 #define THREAD_SIZE_ORDER       ((THREAD_SIZE / PAGE_SIZE) - 1)
  22
  23 #ifndef __ASSEMBLY__
  24
  25 struct thread_info {
  26         struct task_struct      *task;          /* main task structure */
  27         unsigned long           flags;
  28         struct exec_domain      *exec_domain;   /* execution domain */
  29         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  30         __u32                   cpu;            /* should always be 0 on m68k */
  31         unsigned long           tp_value;       /* thread pointer */
  32         struct restart_block    restart_block;
  33 };
  34 #endif /* __ASSEMBLY__ */
  35
  36 #define PREEMPT_ACTIVE          0x4000000
  37
  38 #define INIT_THREAD_INFO(tsk)                   \
  39 {                                               \
  40         .task           = &tsk,                 \
  41         .exec_domain    = &default_exec_domain, \
  42         .preempt_count  = INIT_PREEMPT_COUNT,   \
  43         .restart_block = {                      \
  44                 .fn = do_no_restart_syscall,    \
  45         },                                      \
  46 }
  47
  48 #define init_stack              (init_thread_union.stack)
  49
  50 #ifdef CONFIG_MMU
  51
  52 #ifndef __ASSEMBLY__
  53 #include <asm/current.h>
  54 #endif
  55
  56 #ifdef ASM_OFFSETS_C
  57 #define task_thread_info(tsk)   ((struct thread_info *) NULL)
  58 #else
  59 #include <asm/asm-offsets.h>
  60 #define task_thread_info(tsk)   ((struct thread_info *)((char *)tsk+TASK_TINFO))
  61 #endif
  62
  63 #define init_thread_info        (init_task.thread.info)
  64 #define task_stack_page(tsk)    ((tsk)->stack)
  65 #define current_thread_info()   task_thread_info(current)
  66
  67 #define __HAVE_THREAD_FUNCTIONS
  68
  69 #define setup_thread_stack(p, org) ({                   \
  70         *(struct task_struct **)(p)->stack = (p);       \
  71         task_thread_info(p)->task = (p);                \
  72 })
  73
  74 #define end_of_stack(p)         ((unsigned long *)(p)->stack + 1)
  75
  76 #else /* !CONFIG_MMU */
  77
  78 #ifndef __ASSEMBLY__
  79 /* how to get the thread information struct from C */
  80 static inline struct thread_info *current_thread_info(void)
  81 {
  82         struct thread_info *ti;
  83         __asm__(
  84                 "move.l %%sp, %0 \n\t"
  85                 "and.l  %1, %0"
  86                 : "=&d"(ti)
  87                 : "di" (~(THREAD_SIZE-1))
  88                 );
  89         return ti;
  90 }
  91 #endif
  92
  93 #define init_thread_info        (init_thread_union.thread_info)
  94
  95 #endif /* CONFIG_MMU */
  96
  97 /* entry.S relies on these definitions!
  98  * bits 0-7 are tested at every exception exit
  99  * bits 8-15 are also tested at syscall exit
 100  */
 101 #define TIF_SIGPENDING          6       /* signal pending */
 102 #define TIF_NEED_RESCHED        7       /* rescheduling necessary */
 103 #define TIF_DELAYED_TRACE       14      /* single step a syscall */
 104 #define TIF_SYSCALL_TRACE       15      /* syscall trace active */
 105 #define TIF_MEMDIE              16      /* is terminating due to OOM killer */
 106 #define TIF_FREEZE              17      /* thread is freezing for suspend */
 107 #define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
 108
 109 #endif  /* _ASM_M68K_THREAD_INFO_H */