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thread_info.h

/* thread_info.h: m68knommu low-level thread information
 * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com)
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#include <asm/page.h>

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

/*
 * Size of kernel stack for each process. This must be a power of 2...
 */
#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE_ORDER (0)
#else
#define THREAD_SIZE_ORDER (1)
#endif
                                                                                
/*
 * for asm files, THREAD_SIZE is now generated by asm-offsets.c
 */
#define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)

/*
 * low level task data.
 */
struct thread_info {
      struct task_struct *task;           /* main task structure */
      struct exec_domain *exec_domain;    /* execution domain */
      unsigned long        flags;         /* low level flags */
      int            cpu;                 /* cpu we're on */
      int            preempt_count; /* 0 => preemptable, <0 => BUG */
      struct restart_block restart_block;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .restart_block    = {               \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)


/* 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 /* __ASSEMBLY__ */

#define     PREEMPT_ACTIVE    0x4000000

/*
 * thread information flag bit numbers
 */
#define TIF_SYSCALL_TRACE     0     /* syscall trace active */
#define TIF_SIGPENDING        1     /* signal pending */
#define TIF_NEED_RESCHED      2     /* rescheduling necessary */
#define TIF_POLLING_NRFLAG    3     /* true if poll_idle() is polling
                                 TIF_NEED_RESCHED */
#define TIF_MEMDIE            4

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)

#define _TIF_WORK_MASK        0x0000FFFE  /* work to do on interrupt/exception return */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */

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