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1191 jermar 1 
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <ddi/ddi.h>
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#include <proc/task.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <adt/bitmap.h>
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#include <mm/slab.h>
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#include <arch/pm.h>
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#include <errno.h>
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/** Enable I/O space range for task.
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 *
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 * Interrupts are disabled and task is locked.
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 *
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 * @param task Task.
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 * @param ioaddr Startign I/O space address.
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 * @param size Size of the enabled I/O range.
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 *
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 * @return 0 on success or an error code from errno.h.
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 */
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int ddi_enable_iospace_arch(task_t *task, __address ioaddr, size_t size)
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{
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    count_t bits;
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    bits = ioaddr + size;
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    if (bits > IO_PORTS)
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        return ENOENT;
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    if (task->arch.iomap.bits < bits) {
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        bitmap_t oldiomap;
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        __u8 *newmap;
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        /*
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         * The I/O permission bitmap is too small and needs to be grown.
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         */
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        newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
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        if (!newmap)
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            return ENOMEM;
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        bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
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        bitmap_initialize(&task->arch.iomap, newmap, bits);
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        /*
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         * Mark the new range inaccessible.
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         */
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        bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
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        /*
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         * In case there really existed smaller iomap,
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         * copy its contents and deallocate it.
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         */    
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        if (oldiomap.bits) {
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            bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
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            free(oldiomap.map);
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        }
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    }
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    /*
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     * Enable the range and we are done.
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     */
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    bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
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    return 0;
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}