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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.  /** @addtogroup ia32ddi ia32
  30.  * @ingroup ddi
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <ddi/ddi.h>
  37. #include <arch/ddi/ddi.h>
  38. #include <proc/task.h>
  39. #include <arch/types.h>
  40. #include <typedefs.h>
  41. #include <adt/bitmap.h>
  42. #include <mm/slab.h>
  43. #include <arch/pm.h>
  44. #include <errno.h>
  45. #include <arch/cpu.h>
  46. #include <cpu.h>
  47. #include <arch.h>
  48. #include <align.h>
  49.  
  50. /** Enable I/O space range for task.
  51.  *
  52.  * Interrupts are disabled and task is locked.
  53.  *
  54.  * @param task Task.
  55.  * @param ioaddr Startign I/O space address.
  56.  * @param size Size of the enabled I/O range.
  57.  *
  58.  * @return 0 on success or an error code from errno.h.
  59.  */
  60. int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
  61. {
  62.     count_t bits;
  63.  
  64.     bits = ioaddr + size;
  65.     if (bits > IO_PORTS)
  66.         return ENOENT;
  67.  
  68.     if (task->arch.iomap.bits < bits) {
  69.         bitmap_t oldiomap;
  70.         __u8 *newmap;
  71.    
  72.         /*
  73.          * The I/O permission bitmap is too small and needs to be grown.
  74.          */
  75.        
  76.         newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
  77.         if (!newmap)
  78.             return ENOMEM;
  79.        
  80.         bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
  81.         bitmap_initialize(&task->arch.iomap, newmap, bits);
  82.  
  83.         /*
  84.          * Mark the new range inaccessible.
  85.          */
  86.         bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
  87.  
  88.         /*
  89.          * In case there really existed smaller iomap,
  90.          * copy its contents and deallocate it.
  91.          */    
  92.         if (oldiomap.bits) {
  93.             bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
  94.             free(oldiomap.map);
  95.         }
  96.     }
  97.  
  98.     /*
  99.      * Enable the range and we are done.
  100.      */
  101.     bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
  102.  
  103.     /*
  104.      * Increment I/O Permission bitmap generation counter.
  105.      */
  106.     task->arch.iomapver++;
  107.  
  108.     return 0;
  109. }
  110.  
  111. /** Install I/O Permission bitmap.
  112.  *
  113.  * Current task's I/O permission bitmap, if any, is installed
  114.  * in the current CPU's TSS.
  115.  *
  116.  * Interrupts must be disabled prior this call.
  117.  */
  118. void io_perm_bitmap_install(void)
  119. {
  120.     count_t bits;
  121.     ptr_16_32_t cpugdtr;
  122.     descriptor_t *gdt_p;
  123.     count_t ver;
  124.  
  125.     /* First, copy the I/O Permission Bitmap. */
  126.     spinlock_lock(&TASK->lock);
  127.     ver = TASK->arch.iomapver;
  128.     if ((bits = TASK->arch.iomap.bits)) {
  129.         bitmap_t iomap;
  130.    
  131.         ASSERT(TASK->arch.iomap.map);
  132.         bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
  133.         bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
  134.         /*
  135.          * It is safe to set the trailing eight bits because of the extra
  136.          * convenience byte in TSS_IOMAP_SIZE.
  137.          */
  138.         bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
  139.     }
  140.     spinlock_unlock(&TASK->lock);
  141.  
  142.     /*
  143.      * Second, adjust TSS segment limit.
  144.      * Take the extra ending byte with all bits set into account.
  145.      */
  146.     gdtr_store(&cpugdtr);
  147.     gdt_p = (descriptor_t *) cpugdtr.base;
  148.     gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
  149.     gdtr_load(&cpugdtr);
  150.  
  151.     /*
  152.      * Before we load new TSS limit, the current TSS descriptor
  153.      * type must be changed to describe inactive TSS.
  154.      */
  155.     gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
  156.     tr_load(selector(TSS_DES));
  157.    
  158.     /*
  159.      * Update the generation count so that faults caused by
  160.      * early accesses can be serviced.
  161.      */
  162.     CPU->arch.iomapver_copy = ver;
  163. }
  164.  
  165.  /** @}
  166.  */
  167.  
  168.