LXR linux/arch/m68k/include/asm/thread

   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
  26struct 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 */
  47static 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