thread_info.h

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#ifndef _ASM_M68K_THREAD_INFO_H
#define _ASM_M68K_THREAD_INFO_H

#include <asm/types.h>
#include <asm/page.h>
#include <asm/segment.h>

/*
 * On machines with 4k pages we default to an 8k thread size, though we
 * allow a 4k with config option. Any other machine page size then
 * the thread size must match the page size (which is 8k and larger here).
 */
#if PAGE_SHIFT < 13
#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE 4096
#else
#define THREAD_SIZE 8192
#endif
#else
#define THREAD_SIZE PAGE_SIZE
#endif
#define THREAD_SIZE_ORDER   ((THREAD_SIZE / PAGE_SIZE) - 1)

#ifndef __ASSEMBLY__

struct thread_info {
    struct task_struct  *task;      /* main task structure */
    unsigned long       flags;
    struct exec_domain  *exec_domain;   /* execution domain */
    mm_segment_t        addr_limit; /* thread address space */
    int         preempt_count;  /* 0 => preemptable, <0 => BUG */
    __u32           cpu;        /* should always be 0 on m68k */
    unsigned long       tp_value;   /* thread pointer */
    struct restart_block    restart_block;
};
#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE      0x4000000

#define INIT_THREAD_INFO(tsk)           \
{                       \
    .task       = &tsk,         \
    .exec_domain    = &default_exec_domain, \
    .addr_limit = KERNEL_DS,        \
    .preempt_count  = INIT_PREEMPT_COUNT,   \
    .restart_block = {          \
        .fn = do_no_restart_syscall,    \
    },                  \
}

#define init_stack      (init_thread_union.stack)

#ifndef __ASSEMBLY__
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
    struct thread_info *ti;
    __asm__(
        "move.l %%sp, %0 \n\t"
        "and.l  %1, %0"
        : "=&d"(ti)
        : "di" (~(THREAD_SIZE-1))
        );
    return ti;
}
#endif

#define init_thread_info    (init_thread_union.thread_info)

/* entry.S relies on these definitions!
 * bits 0-7 are tested at every exception exit
 * bits 8-15 are also tested at syscall exit
 */
#define TIF_NOTIFY_RESUME   5   /* callback before returning to user */
#define TIF_SIGPENDING      6   /* signal pending */
#define TIF_NEED_RESCHED    7   /* rescheduling necessary */
#define TIF_DELAYED_TRACE   14  /* single step a syscall */
#define TIF_SYSCALL_TRACE   15  /* syscall trace active */
#define TIF_MEMDIE      16  /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 18  /* restore signal mask in do_signal */

#endif  /* _ASM_M68K_THREAD_INFO_H */