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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 <arch/mm/as.h>
  30. #include <arch/mm/asid.h>
  31. #include <arch/mm/page.h>
  32. #include <genarch/mm/as_ht.h>
  33. #include <genarch/mm/asid_fifo.h>
  34. #include <mm/asid.h>
  35. #include <arch.h>
  36. #include <arch/barrier.h>
  37. #include <synch/spinlock.h>
  38.  
  39. /** Architecture dependent address space init. */
  40. void as_arch_init(void)
  41. {
  42.     as_operations = &as_ht_operations;
  43.     asid_fifo_init();
  44. }
  45.  
  46. /** Prepare registers for switching to another address space.
  47.  *
  48.  * @param as Address space.
  49.  */
  50. void as_install_arch(as_t *as)
  51. {
  52.     ipl_t ipl;
  53.     region_register rr;
  54.     int i;
  55.    
  56.     ipl = interrupts_disable();
  57.     spinlock_lock(&as->lock);
  58.    
  59.     ASSERT(as->asid != ASID_INVALID);
  60.    
  61.     /*
  62.      * Load respective ASID (7 consecutive RIDs) to
  63.      * region registers.
  64.      */
  65.     for (i = 0; i < REGION_REGISTERS; i++) {
  66.         if (i == VRN_KERNEL)
  67.             continue;
  68.        
  69.         rr.word = rr_read(i);
  70.         rr.map.ve = false;          /* disable VHPT walker */
  71.         rr.map.rid = ASID2RID(as->asid, i);
  72.         rr.map.ps = PAGE_WIDTH;
  73.         rr_write(i, rr.word);
  74.     }
  75.     srlz_d();
  76.     srlz_i();
  77.    
  78.     spinlock_unlock(&as->lock);
  79.     interrupts_restore(ipl);
  80. }
  81.