base/usi/usi.c

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/*
 * Copyright (C) 1999-2003 Paolo Mantegazza <mantegazza@aero.polimi.it>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");

#if 0

#include <rtai.h>
#include <rtai_sched.h>
#include <rtai_malloc.h>
#include <rtai_lxrt.h>
#include <rtai_tasklets.h>
#include <rtai_usi.h>
#include <rtai_sem.h>

#define MODULE_NAME "RTAI_USI"

static void *rt_spin_lock_init(void)
{
    spinlock_t *lock;
 
    if ((lock = rt_malloc(sizeof(spinlock_t)))) {
        spin_lock_init(lock);
        return lock;
    }
    return 0;
}

static inline int rt_spin_lock_delete(void *lock)
{
    rt_free(lock);
    return 0;
}
                                                                               
static void usi_spin_lock(spinlock_t *lock)          
{
    rt_spin_lock(lock);
}

static void usi_spin_unlock(spinlock_t *lock)          
{
    rt_spin_unlock(lock);
}

static void usi_spin_lock_irq(spinlock_t *lock)          
{
    rt_spin_lock_irq(lock);
}

static void usi_spin_unlock_irq(spinlock_t *lock)
{
    rt_spin_unlock_irq(lock);
}

static unsigned long usi_spin_lock_irqsave(spinlock_t *lock)          
{
    return rt_spin_lock_irqsave(lock);
}

static void usi_spin_unlock_irqrestore(unsigned long flags, spinlock_t *lock)
{
    rt_spin_unlock_irqrestore(flags, lock);
}

static void usi_global_cli(void)
{
    rt_global_cli();
}

static void usi_global_sti(void)
{
    rt_global_sti();
}

static unsigned long usi_global_save_flags_and_cli(void)
{
    return rt_global_save_flags_and_cli();
}

static unsigned long usi_global_save_flags(void)
{
    unsigned long flags;
    rt_global_save_flags(&flags);
    return flags;
}

static void usi_global_restore_flags(unsigned long flags)
{
    rt_global_restore_flags(flags);
}

static void usi_cli(void)
{
    rtai_cli();
}

static void usi_sti(void)
{
    rtai_sti();
}

static unsigned long usi_save_flags_and_cli(void)
{
    unsigned long flags;
    rtai_save_flags_and_cli(flags);
    return flags;
}

static unsigned long usi_save_flags(void)
{
    unsigned long flags;
    rtai_save_flags(flags);
    return flags;
}

static void usi_restore_flags(unsigned long flags)
{
    rtai_restore_flags(flags);
}

static struct rt_fun_entry rtai_usi_fun[] = {
    [_STARTUP_IRQ]      = { 0, rt_startup_irq },
    [_SHUTDOWN_IRQ]     = { 0, rt_shutdown_irq },
    [_ENABLE_IRQ]       = { 0, rt_enable_irq },
    [_DISABLE_IRQ]      = { 0, rt_disable_irq },
    [_MASK_AND_ACK_IRQ] = { 0, rt_mask_and_ack_irq },
    [_ACK_IRQ]      = { 0, rt_ack_irq },
    [_UNMASK_IRQ ]      = { 0, rt_unmask_irq },
    [_INIT_SPIN_LOCK]   = { 0, rt_spin_lock_init },
    [_SPIN_LOCK]        = { 0, usi_spin_lock },
    [_SPIN_UNLOCK]      = { 0, usi_spin_unlock },
    [_SPIN_LOCK_IRQ]    = { 0, usi_spin_lock_irq },
    [_SPIN_UNLOCK_IRQ]  = { 0, usi_spin_unlock_irq },
    [_SPIN_LOCK_IRQSV]  = { 0, usi_spin_lock_irqsave },
    [_SPIN_UNLOCK_IRQRST]   = { 0, usi_spin_unlock_irqrestore },
    [_GLB_CLI]      = { 0, usi_global_cli },
    [_GLB_STI]      = { 0, usi_global_sti},
    [_GLB_SVFLAGS_CLI]  = { 0, usi_global_save_flags_and_cli },
    [_GLB_SVFLAGS]      = { 0, usi_global_save_flags },
    [_GLB_RSTFLAGS]     = { 0, usi_global_restore_flags },
    [_CLI]          = { 0, usi_cli },
    [_STI]          = { 0, usi_sti},
    [_SVFLAGS_CLI]      = { 0, usi_save_flags_and_cli },
    [_SVFLAGS]      = { 0, usi_save_flags },
    [_RSTFLAGS]     = { 0, usi_restore_flags }
};

static RT_TASK *rt_base_linux_task;

static int register_lxrt_usi_support(void)
{
    RT_TASK *rt_linux_tasks[NR_RT_CPUS];
    rt_base_linux_task = rt_get_base_linux_task(rt_linux_tasks);
    if(rt_base_linux_task->task_trap_handler[0]) {
        if(((int (*)(void *, int))rt_base_linux_task->task_trap_handler[0])(rtai_usi_fun, FUN_USI_LXRT_INDX)) {
            printk("LXRT EXTENSION SLOT FOR USI (%d) ALREADY USED\n", FUN_USI_LXRT_INDX);
            return -EACCES;
        }
    }
    return 0;
}

static void unregister_lxrt_usi_support(void)
{
    if(rt_base_linux_task->task_trap_handler[1]) {
        ((int (*)(void *, int))rt_base_linux_task->task_trap_handler[1])(rtai_usi_fun, FUN_USI_LXRT_INDX);
    }
}

int __rtai_usi_init(void)
{
    if (!register_lxrt_usi_support()) {
        printk(KERN_INFO "RTAI[usi]: loaded.\n");
        return 0;
    }
    return -EACCES;
}

void __rtai_usi_exit(void)
{
    unregister_lxrt_usi_support();
    printk(KERN_INFO "RTAI[usi]: unloaded.\n");
}

#endif

int __rtai_usi_init(void)
{
    printk(KERN_INFO "RTAI[usi]: loaded.\n");
    return 0;
}

void __rtai_usi_exit(void)
{
    printk(KERN_INFO "RTAI[usi]: unloaded.\n");
}

#ifndef CONFIG_RTAI_USI_BUILTIN
module_init(__rtai_usi_init);
module_exit(__rtai_usi_exit);
#endif /* !CONFIG_RTAI_USI_BUILTIN */

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