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Linux/arch/m68k/include/asm/thread_info.h

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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 #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 */
 75 

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