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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
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <ddi/ddi.h>
  36. #include <arch/ddi/ddi.h>
  37. #include <proc/task.h>
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <adt/bitmap.h>
  41. #include <mm/slab.h>
  42. #include <arch/pm.h>
  43. #include <errno.h>
  44. #include <arch/cpu.h>
  45. #include <cpu.h>
  46. #include <arch.h>
  47. #include <align.h>
  48.  
  49. /** Enable I/O space range for task.
  50.  *
  51.  * Interrupts are disabled and task is locked.
  52.  *
  53.  * @param task Task.
  54.  * @param ioaddr Startign I/O space address.
  55.  * @param size Size of the enabled I/O range.
  56.  *
  57.  * @return 0 on success or an error code from errno.h.
  58.  */
  59. int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
  60. {
  61.     count_t bits;
  62.  
  63.     bits = ioaddr + size;
  64.     if (bits > IO_PORTS)
  65.         return ENOENT;
  66.  
  67.     if (task->arch.iomap.bits < bits) {
  68.         bitmap_t oldiomap;
  69.         uint8_t *newmap;
  70.    
  71.         /*
  72.          * The I/O permission bitmap is too small and needs to be grown.
  73.          */
  74.        
  75.         newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
  76.         if (!newmap)
  77.             return ENOMEM;
  78.        
  79.         bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
  80.         bitmap_initialize(&task->arch.iomap, newmap, bits);
  81.  
  82.         /*
  83.          * Mark the new range inaccessible.
  84.          */
  85.         bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
  86.  
  87.         /*
  88.          * In case there really existed smaller iomap,
  89.          * copy its contents and deallocate it.
  90.          */    
  91.         if (oldiomap.bits) {
  92.             bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
  93.             free(oldiomap.map);
  94.         }
  95.     }
  96.  
  97.     /*
  98.      * Enable the range and we are done.
  99.      */
  100.     bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
  101.  
  102.     /*
  103.      * Increment I/O Permission bitmap generation counter.
  104.      */
  105.     task->arch.iomapver++;
  106.  
  107.     return 0;
  108. }
  109.  
  110. /** Install I/O Permission bitmap.
  111.  *
  112.  * Current task's I/O permission bitmap, if any, is installed
  113.  * in the current CPU's TSS.
  114.  *
  115.  * Interrupts must be disabled prior this call.
  116.  */
  117. void io_perm_bitmap_install(void)
  118. {
  119.     count_t bits;
  120.     ptr_16_32_t cpugdtr;
  121.     descriptor_t *gdt_p;
  122.     count_t ver;
  123.  
  124.     /* First, copy the I/O Permission Bitmap. */
  125.     spinlock_lock(&TASK->lock);
  126.     ver = TASK->arch.iomapver;
  127.     if ((bits = TASK->arch.iomap.bits)) {
  128.         bitmap_t iomap;
  129.    
  130.         ASSERT(TASK->arch.iomap.map);
  131.         bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
  132.         bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
  133.         /*
  134.          * It is safe to set the trailing eight bits because of the extra
  135.          * convenience byte in TSS_IOMAP_SIZE.
  136.          */
  137.         bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
  138.     }
  139.     spinlock_unlock(&TASK->lock);
  140.  
  141.     /*
  142.      * Second, adjust TSS segment limit.
  143.      * Take the extra ending byte with all bits set into account.
  144.      */
  145.     gdtr_store(&cpugdtr);
  146.     gdt_p = (descriptor_t *) cpugdtr.base;
  147.     gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
  148.     gdtr_load(&cpugdtr);
  149.  
  150.     /*
  151.      * Before we load new TSS limit, the current TSS descriptor
  152.      * type must be changed to describe inactive TSS.
  153.      */
  154.     gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
  155.     tr_load(selector(TSS_DES));
  156.    
  157.     /*
  158.      * Update the generation count so that faults caused by
  159.      * early accesses can be serviced.
  160.      */
  161.     CPU->arch.iomapver_copy = ver;
  162. }
  163.  
  164. /** @}
  165.  */
  166.