thread_info.h

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/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_THREAD_INFO_H
#define __ASM_AVR32_THREAD_INFO_H

#include <asm/page.h>

#define THREAD_SIZE_ORDER   1
#define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)

#ifndef __ASSEMBLY__
#include <asm/types.h>

struct task_struct;
struct exec_domain;

struct thread_info {
    struct task_struct  *task;      /* main task structure */
    struct exec_domain  *exec_domain;   /* execution domain */
    unsigned long       flags;      /* low level flags */
    __u32           cpu;
    __s32           preempt_count;  /* 0 => preemptable, <0 => BUG */
    __u32           rar_saved;  /* return address... */
    __u32           rsr_saved;  /* ...and status register
                           saved by debug handler
                           when setting up
                           trampoline */
    struct restart_block    restart_block;
    __u8            supervisor_stack[0];
};

#define INIT_THREAD_INFO(tsk)                       \
{                                   \
    .task       = &tsk,                     \
    .exec_domain    = &default_exec_domain,             \
    .flags      = 0,                        \
    .cpu        = 0,                        \
    .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)

/*
 * Get the thread information struct from C.
 * We do the usual trick and use the lower end of the stack for this
 */
static inline struct thread_info *current_thread_info(void)
{
    unsigned long addr = ~(THREAD_SIZE - 1);

    asm("and %0, sp" : "=r"(addr) : "0"(addr));
    return (struct thread_info *)addr;
}

#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE      0x40000000

/*
 * Thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
#define TIF_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_BREAKPOINT      4   /* enter monitor mode on return */
#define TIF_SINGLE_STEP     5   /* single step in progress */
#define TIF_MEMDIE      6   /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 7   /* restore signal mask in do_signal */
#define TIF_CPU_GOING_TO_SLEEP  8   /* CPU is entering sleep 0 mode */
#define TIF_NOTIFY_RESUME   9   /* callback before returning to user */
#define TIF_DEBUG       30  /* debugging enabled */
#define TIF_USERSPACE       31      /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE  (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING     (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED   (1 << TIF_NEED_RESCHED)
#define _TIF_BREAKPOINT     (1 << TIF_BREAKPOINT)
#define _TIF_SINGLE_STEP    (1 << TIF_SINGLE_STEP)
#define _TIF_MEMDIE     (1 << TIF_MEMDIE)
#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
#define _TIF_NOTIFY_RESUME  (1 << TIF_NOTIFY_RESUME)

/* Note: The masks below must never span more than 16 bits! */

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK              \
    (_TIF_SIGPENDING            \
     | _TIF_NOTIFY_RESUME           \
     | _TIF_NEED_RESCHED            \
     | _TIF_BREAKPOINT)

/* work to do on any return to userspace */
#define _TIF_ALLWORK_MASK   (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
/* work to do on return from debug mode */
#define _TIF_DBGWORK_MASK   (_TIF_WORK_MASK & ~_TIF_BREAKPOINT)

#endif /* __ASM_AVR32_THREAD_INFO_H */