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/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <ddi/ddi.h>
#include <proc/task.h>
#include <arch/types.h>
#include <typedefs.h>
#include <adt/bitmap.h>
#include <mm/slab.h>
#include <arch/pm.h>
#include <errno.h>

/** Enable I/O space range for task.
 *
 * Interrupts are disabled and task is locked.
 *
 * @param task Task.
 * @param ioaddr Startign I/O space address.
 * @param size Size of the enabled I/O range.
 *
 * @return 0 on success or an error code from errno.h.
 */
int ddi_enable_iospace_arch(task_t *task, __address ioaddr, size_t size)
{
    count_t bits;

    bits = ioaddr + size;
    if (bits > IO_PORTS)
        return ENOENT;

    if (task->arch.iomap.bits < bits) {
        bitmap_t oldiomap;
        __u8 *newmap;
    
        /*
         * The I/O permission bitmap is too small and needs to be grown.
         */
        
        newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
        if (!newmap)
            return ENOMEM;
        
        bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
        bitmap_initialize(&task->arch.iomap, newmap, bits);

        /*
         * Mark the new range inaccessible.
         */
        bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);

        /*
         * In case there really existed smaller iomap,
         * copy its contents and deallocate it.
         */     
        if (oldiomap.bits) {
            bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
            free(oldiomap.map);
        }
    }

    /*
     * Enable the range and we are done.
     */
    bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);

    return 0;
}