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