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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 sparc64proc sparc64
  30.  * @ingroup proc
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <proc/scheduler.h>
  37. #include <proc/thread.h>
  38. #include <arch.h>
  39. #include <arch/mm/tlb.h>
  40. #include <arch/mm/page.h>
  41. #include <config.h>
  42. #include <align.h>
  43.  
  44. /** Perform sparc64 specific tasks needed before the new task is run. */
  45. void before_task_runs_arch(void)
  46. {
  47. }
  48.  
  49. /** Ensure that thread's kernel stack is locked in TLB. */
  50. void before_thread_runs_arch(void)
  51. {
  52.     __address base;
  53.    
  54.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  55.  
  56.     if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
  57.         /*
  58.          * Kernel stack of this thread is not locked in DTLB.
  59.          * First, make sure it is not mapped already.
  60.          * If not, create a locked mapping for it.
  61.          */
  62.          dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack);
  63.          dtlb_insert_mapping((__address) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
  64.     }  
  65. }
  66.  
  67. /** Unlock thread's stack from TLB, if necessary. */
  68. void after_thread_ran_arch(void)
  69. {
  70.     __address base;
  71.  
  72.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  73.  
  74.     if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
  75.         /*
  76.          * Kernel stack of this thread is locked in DTLB.
  77.          * Destroy the mapping.
  78.          */
  79.         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack);
  80.     }
  81. }
  82.  
  83.  /** @}
  84.  */
  85.  
  86.