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thread_info.h

#ifndef _ASM_M68K_THREAD_INFO_H
#define _ASM_M68K_THREAD_INFO_H

#include <asm/types.h>
#include <asm/page.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 */
      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, \
      .preempt_count    = INIT_PREEMPT_COUNT,   \
      .restart_block = {                  \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_stack            (init_thread_union.stack)

#ifdef CONFIG_MMU

#ifndef __ASSEMBLY__
#include <asm/current.h>
#endif

#ifdef ASM_OFFSETS_C
#define task_thread_info(tsk) ((struct thread_info *) NULL)
#else
#include <asm/asm-offsets.h>
#define task_thread_info(tsk) ((struct thread_info *)((char *)tsk+TASK_TINFO))
#endif

#define init_thread_info      (init_task.thread.info)
#define task_stack_page(tsk)  ((tsk)->stack)
#define current_thread_info() task_thread_info(current)

#define __HAVE_THREAD_FUNCTIONS

#define setup_thread_stack(p, org) ({                 \
      *(struct task_struct **)(p)->stack = (p); \
      task_thread_info(p)->task = (p);          \
})

#define end_of_stack(p)       ((unsigned long *)(p)->stack + 1)

#else /* !CONFIG_MMU */

#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)

#endif /* CONFIG_MMU */

/* 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_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_FREEZE            17    /* thread is freezing for suspend */
#define TIF_RESTORE_SIGMASK   18    /* restore signal mask in do_signal */

#endif      /* _ASM_M68K_THREAD_INFO_H */

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