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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 <proc/scheduler.h>
  30. #include <proc/thread.h>
  31. #include <arch.h>
  32. #include <arch/mm/tlb.h>
  33. #include <arch/mm/page.h>
  34. #include <config.h>
  35. #include <align.h>
  36.  
  37. /** Ensure that thread's kernel stack is locked in TLB. */
  38. void before_thread_runs_arch(void)
  39. {
  40.     __address base;
  41.    
  42.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  43.  
  44.     if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
  45.         /*
  46.          * Kernel stack of this thread is not locked in DTLB.
  47.          * First, make sure it is not mapped already.
  48.          * If not, create a locked mapping for it.
  49.          */
  50.          dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack);
  51.          dtlb_insert_mapping((__address) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
  52.     }  
  53. }
  54.  
  55. /** Unlock thread's stack from TLB, if necessary. */
  56. void after_thread_ran_arch(void)
  57. {
  58.     __address base;
  59.  
  60.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  61.  
  62.     if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
  63.         /*
  64.          * Kernel stack of this thread is locked in DTLB.
  65.          * Destroy the mapping.
  66.          */
  67.         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack);
  68.     }
  69. }
  70.