include/asm-m68k/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/processor.h>
   6 #include <asm/page.h>
   7
   8 struct thread_info {
   9         struct task_struct      *task;          /* main task structure */
  10         struct exec_domain      *exec_domain;   /* execution domain */
  11         __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
  12         __u32 cpu; /* should always be 0 on m68k */
  13         struct restart_block    restart_block;
  14
  15         __u8                    supervisor_stack[0];
  16 };
  17
  18 #define PREEMPT_ACTIVE          0x4000000
  19
  20 #define INIT_THREAD_INFO(tsk)                   \
  21 {                                               \
  22         .task           = &tsk,                 \
  23         .exec_domain    = &default_exec_domain, \
  24         .restart_block = {                      \
  25                 .fn = do_no_restart_syscall,    \
  26         },                                      \
  27 }
  28
  29 /* THREAD_SIZE should be 8k, so handle differently for 4k and 8k machines */
  30 #if PAGE_SHIFT == 13 /* 8k machines */
  31 #define alloc_thread_info(tsk)   ((struct thread_info *)__get_free_pages(GFP_KERNEL,0))
  32 #define free_thread_info(ti)  free_pages((unsigned long)(ti),0)
  33 #else /* otherwise assume 4k pages */
  34 #define alloc_thread_info(tsk)   ((struct thread_info *)__get_free_pages(GFP_KERNEL,1))
  35 #define free_thread_info(ti)  free_pages((unsigned long)(ti),1)
  36 #endif /* PAGE_SHIFT == 13 */
  37
  38 //#define init_thread_info      (init_task.thread.info)
  39 #define init_stack              (init_thread_union.stack)
  40
  41 #define current_thread_info()   (current->thread_info)
  42
  43
  44 #define __HAVE_THREAD_FUNCTIONS
  45
  46 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  47 #define TIF_DELAYED_TRACE       1       /* single step a syscall */
  48 #define TIF_NOTIFY_RESUME       2       /* resumption notification requested */
  49 #define TIF_SIGPENDING          3       /* signal pending */
  50 #define TIF_NEED_RESCHED        4       /* rescheduling necessary */
  51
  52 extern int thread_flag_fixme(void);
  53
  54 /*
  55  * flag set/clear/test wrappers
  56  * - pass TIF_xxxx constants to these functions
  57  */
  58
  59 #define __set_tsk_thread_flag(tsk, flag, val) ({        \
  60         switch (flag) {                                 \
  61         case TIF_SIGPENDING:                            \
  62                 tsk->thread.work.sigpending = val;      \
  63                 break;                                  \
  64         case TIF_NEED_RESCHED:                          \
  65                 tsk->thread.work.need_resched = val;    \
  66                 break;                                  \
  67         case TIF_SYSCALL_TRACE:                         \
  68                 tsk->thread.work.syscall_trace = val;   \
  69                 break;                                  \
  70         default:                                        \
  71                 thread_flag_fixme();                    \
  72         }                                               \
  73 })
  74
  75 #define __get_tsk_thread_flag(tsk, flag) ({             \
  76         int ___res;                                     \
  77         switch (flag) {                                 \
  78         case TIF_SIGPENDING:                            \
  79                 ___res = tsk->thread.work.sigpending;   \
  80                 break;                                  \
  81         case TIF_NEED_RESCHED:                          \
  82                 ___res = tsk->thread.work.need_resched; \
  83                 break;                                  \
  84         case TIF_SYSCALL_TRACE:                         \
  85                 ___res = tsk->thread.work.syscall_trace;\
  86                 break;                                  \
  87         default:                                        \
  88                 ___res = thread_flag_fixme();           \
  89         }                                               \
  90         ___res;                                         \
  91 })
  92
  93 #define __get_set_tsk_thread_flag(tsk, flag, val) ({    \
  94         int __res = __get_tsk_thread_flag(tsk, flag);   \
  95         __set_tsk_thread_flag(tsk, flag, val);          \
  96         __res;                                          \
  97 })
  98
  99 #define set_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, ~0)
 100 #define clear_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, 0)
 101 #define test_and_set_tsk_thread_flag(tsk, flag) __get_set_tsk_thread_flag(tsk, flag, ~0)
 102 #define test_tsk_thread_flag(tsk, flag) __get_tsk_thread_flag(tsk, flag)
 103
 104 #define set_thread_flag(flag) set_tsk_thread_flag(current, flag)
 105 #define clear_thread_flag(flag) clear_tsk_thread_flag(current, flag)
 106 #define test_thread_flag(flag) test_tsk_thread_flag(current, flag)
 107
 108 #define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
 109 #define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
 110
 111 #endif  /* _ASM_M68K_THREAD_INFO_H */