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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 <arch/ddi/ddi.h>
  31. #include <proc/task.h>
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <adt/bitmap.h>
  35. #include <mm/slab.h>
  36. #include <arch/pm.h>
  37. #include <errno.h>
  38. #include <arch/cpu.h>
  39. #include <cpu.h>
  40. #include <arch.h>
  41.  
  42. /** Enable I/O space range for task.
  43.  *
  44.  * Interrupts are disabled and task is locked.
  45.  *
  46.  * @param task Task.
  47.  * @param ioaddr Startign I/O space address.
  48.  * @param size Size of the enabled I/O range.
  49.  *
  50.  * @return 0 on success or an error code from errno.h.
  51.  */
  52. int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
  53. {
  54.     count_t bits;
  55.  
  56.     bits = ioaddr + size;
  57.     if (bits > IO_PORTS)
  58.         return ENOENT;
  59.  
  60.     if (task->arch.iomap.bits < bits) {
  61.         bitmap_t oldiomap;
  62.         __u8 *newmap;
  63.    
  64.         /*
  65.          * The I/O permission bitmap is too small and needs to be grown.
  66.          */
  67.        
  68.         newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
  69.         if (!newmap)
  70.             return ENOMEM;
  71.        
  72.         bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
  73.         bitmap_initialize(&task->arch.iomap, newmap, bits);
  74.  
  75.         /*
  76.          * Mark the new range inaccessible.
  77.          */
  78.         bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
  79.  
  80.         /*
  81.          * In case there really existed smaller iomap,
  82.          * copy its contents and deallocate it.
  83.          */    
  84.         if (oldiomap.bits) {
  85.             bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
  86.             free(oldiomap.map);
  87.         }
  88.     }
  89.  
  90.     /*
  91.      * Enable the range and we are done.
  92.      */
  93.     bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
  94.  
  95.     /*
  96.      * Increment I/O Permission bitmap generation counter.
  97.      */
  98.     task->arch.iomapver++;
  99.  
  100.     return 0;
  101. }
  102.  
  103. /** Enable/disable interrupts for syscall
  104.  *
  105.  * @param enable If non-zero, interrupts are enabled, otherwise disabled
  106.  * @param flags EFLAGS flags register
  107.  */
  108. __native ddi_int_control_arch(__native enable, __native *flags)
  109. {
  110.     if (enable)
  111.         *flags |= EFLAGS_IF;
  112.     else
  113.         *flags &= ~EFLAGS_IF;
  114.     return 0;
  115. }
  116.  
  117. /** Install I/O Permission bitmap.
  118.  *
  119.  * Current task's I/O permission bitmap, if any, is installed
  120.  * in the current CPU's TSS.
  121.  *
  122.  * Interrupts must be disabled prior this call.
  123.  */
  124. void io_perm_bitmap_install(void)
  125. {
  126.     count_t bits;
  127.     ptr_16_32_t cpugdtr;
  128.     descriptor_t *gdt_p;
  129.     count_t ver;
  130.  
  131.     /* First, copy the I/O Permission Bitmap. */
  132.     spinlock_lock(&TASK->lock);
  133.     ver = TASK->arch.iomapver;
  134.     if ((bits = TASK->arch.iomap.bits)) {
  135.         bitmap_t iomap;
  136.    
  137.         ASSERT(TASK->arch.iomap.map);
  138.         bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
  139.         bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
  140.         /*
  141.          * It is safe to set the trailing eight bits because of the extra
  142.          * convenience byte in TSS_IOMAP_SIZE.
  143.          */
  144.         bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8);
  145.     }
  146.     spinlock_unlock(&TASK->lock);
  147.  
  148.     /* Second, adjust TSS segment limit. */
  149.     gdtr_store(&cpugdtr);
  150.     gdt_p = (descriptor_t *) cpugdtr.base;
  151.     gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
  152.     gdtr_load(&cpugdtr);
  153.  
  154.     /*
  155.      * Before we load new TSS limit, the current TSS descriptor
  156.      * type must be changed to describe inactive TSS.
  157.      */
  158.     gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
  159.     tr_load(selector(TSS_DES));
  160.    
  161.     /*
  162.      * Update the generation count so that faults caused by
  163.      * early accesses can be serviced.
  164.      */
  165.     CPU->arch.iomapver_copy = ver;
  166. }
  167.