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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. #include <arch/cpu.h>
  38.  
  39. /** Enable I/O space range for task.
  40.  *
  41.  * Interrupts are disabled and task is locked.
  42.  *
  43.  * @param task Task.
  44.  * @param ioaddr Startign I/O space address.
  45.  * @param size Size of the enabled I/O range.
  46.  *
  47.  * @return 0 on success or an error code from errno.h.
  48.  */
  49. int ddi_enable_iospace_arch(task_t *task, __address ioaddr, size_t size)
  50. {
  51.     count_t bits;
  52.  
  53.     bits = ioaddr + size;
  54.     if (bits > IO_PORTS)
  55.         return ENOENT;
  56.  
  57.     if (task->arch.iomap.bits < bits) {
  58.         bitmap_t oldiomap;
  59.         __u8 *newmap;
  60.    
  61.         /*
  62.          * The I/O permission bitmap is too small and needs to be grown.
  63.          */
  64.        
  65.         newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
  66.         if (!newmap)
  67.             return ENOMEM;
  68.        
  69.         bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
  70.         bitmap_initialize(&task->arch.iomap, newmap, bits);
  71.  
  72.         /*
  73.          * Mark the new range inaccessible.
  74.          */
  75.         bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
  76.  
  77.         /*
  78.          * In case there really existed smaller iomap,
  79.          * copy its contents and deallocate it.
  80.          */    
  81.         if (oldiomap.bits) {
  82.             bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
  83.             free(oldiomap.map);
  84.         }
  85.     }
  86.  
  87.     /*
  88.      * Enable the range and we are done.
  89.      */
  90.     bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
  91.  
  92.     return 0;
  93. }
  94.  
  95. /** Enable/disable interrupts form syscall
  96.  *
  97.  * @param enable If non-zero, interrupts are enabled, otherwise disabled
  98.  * @param flags RFLAGS register
  99.  */
  100. __native ddi_int_control_arch(__native enable, __native *flags)
  101. {
  102.     if (enable)
  103.         *flags |= RFLAGS_IF;
  104.     else
  105.         *flags &= ~RFLAGS_IF;
  106.     return 0;
  107. }
  108.