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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <ddi/ddi.h>
  30. #include <proc/task.h>
  31. #include <arch/types.h>
  32. #include <typedefs.h>
  33. #include <adt/bitmap.h>
  34. #include <mm/slab.h>
  35. #include <arch/pm.h>
  36. #include <errno.h>
  37.  
  38. /** Enable I/O space range for task.
  39.  *
  40.  * Interrupts are disabled and task is locked.
  41.  *
  42.  * @param task Task.
  43.  * @param ioaddr Startign I/O space address.
  44.  * @param size Size of the enabled I/O range.
  45.  *
  46.  * @return 0 on success or an error code from errno.h.
  47.  */
  48. int ddi_enable_iospace_arch(task_t *task, __address ioaddr, size_t size)
  49. {
  50.     count_t bits;
  51.  
  52.     bits = ioaddr + size;
  53.     if (bits > IO_PORTS)
  54.         return ENOENT;
  55.  
  56.     if (task->arch.iomap.bits < bits) {
  57.         bitmap_t oldiomap;
  58.         __u8 *newmap;
  59.    
  60.         /*
  61.          * The I/O permission bitmap is too small and needs to be grown.
  62.          */
  63.        
  64.         newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
  65.         if (!newmap)
  66.             return ENOMEM;
  67.        
  68.         bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
  69.         bitmap_initialize(&task->arch.iomap, newmap, bits);
  70.  
  71.         /*
  72.          * Mark the new range inaccessible.
  73.          */
  74.         bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
  75.  
  76.         /*
  77.          * In case there really existed smaller iomap,
  78.          * copy its contents and deallocate it.
  79.          */    
  80.         if (oldiomap.bits) {
  81.             bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
  82.             free(oldiomap.map);
  83.         }
  84.     }
  85.  
  86.     /*
  87.      * Enable the range and we are done.
  88.      */
  89.     bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
  90.  
  91.     return 0;
  92. }
  93.