thread_info.h

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#ifndef _ASM_PARISC_THREAD_INFO_H
#define _ASM_PARISC_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/special_insns.h>

struct thread_info {
    struct task_struct *task;   /* main task structure */
    struct exec_domain *exec_domain;/* execution domain */
    unsigned long flags;        /* thread_info flags (see TIF_*) */
    mm_segment_t addr_limit;    /* user-level address space limit */
    __u32 cpu;          /* current CPU */
    int preempt_count;      /* 0=premptable, <0=BUG; will also serve as bh-counter */
    struct restart_block restart_block;
};

#define INIT_THREAD_INFO(tsk)           \
{                       \
    .task       = &tsk,         \
    .exec_domain    = &default_exec_domain, \
    .flags      = 0,            \
    .cpu        = 0,            \
    .addr_limit = KERNEL_DS,        \
    .preempt_count  = INIT_PREEMPT_COUNT,   \
    .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 */
#define current_thread_info()   ((struct thread_info *)mfctl(30))

#endif /* !__ASSEMBLY */

/* thread information allocation */

#define THREAD_SIZE_ORDER            2
/* Be sure to hunt all references to this down when you change the size of
 * the kernel stack */
#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_SHIFT            (PAGE_SHIFT + THREAD_SIZE_ORDER)

#define PREEMPT_ACTIVE_BIT  28
#define PREEMPT_ACTIVE      (1 << PREEMPT_ACTIVE_BIT)

/*
 * thread information flags
 */
#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_32BIT               4       /* 32 bit binary */
#define TIF_MEMDIE      5   /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 6   /* restore saved signal mask */
#define TIF_NOTIFY_RESUME   8   /* callback before returning to user */
#define TIF_SINGLESTEP      9   /* single stepping? */
#define TIF_BLOCKSTEP       10  /* branch stepping? */

#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_32BIT      (1 << TIF_32BIT)
#define _TIF_NOTIFY_RESUME  (1 << TIF_NOTIFY_RESUME)
#define _TIF_SINGLESTEP     (1 << TIF_SINGLESTEP)
#define _TIF_BLOCKSTEP      (1 << TIF_BLOCKSTEP)

#define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                 _TIF_NEED_RESCHED)
#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                 _TIF_BLOCKSTEP)

#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

#endif /* __KERNEL__ */

#endif /* _ASM_PARISC_THREAD_INFO_H */