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  1. /*
  2.  * Copyright (C) 2005 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 ia32xen_proc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <proc/scheduler.h>
  36. #include <cpu.h>
  37. #include <proc/task.h>
  38. #include <proc/thread.h>
  39. #include <arch.h>
  40. #include <arch/context.h>   /* SP_DELTA */
  41. #include <arch/debugger.h>
  42. #include <arch/pm.h>
  43. #include <arch/asm.h>
  44. #include <arch/ddi/ddi.h>
  45.  
  46. /** Perform ia32 specific tasks needed before the new task is run.
  47.  *
  48.  * Interrupts are disabled.
  49.  */
  50. void before_task_runs_arch(void)
  51. {
  52. //  io_perm_bitmap_install();
  53. }
  54.  
  55. /** Perform ia32 specific tasks needed before the new thread is scheduled.
  56.  *
  57.  * THREAD is locked and interrupts are disabled.
  58.  */
  59. void before_thread_runs_arch(void)
  60. {
  61.     CPU->arch.tss->esp0 = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  62.     CPU->arch.tss->ss0 = selector(KDATA_DES);
  63.  
  64.     /* Set up TLS in GS register */
  65. //  set_tls_desc(THREAD->arch.tls);
  66.  
  67. #ifdef CONFIG_DEBUG_AS_WATCHPOINT
  68.     /* Set watchpoint on AS to ensure that nobody sets it to zero */
  69.     if (CPU->id < BKPOINTS_MAX)
  70.         breakpoint_add(&((the_t *) THREAD->kstack)->as,
  71.                    BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
  72.                    CPU->id);
  73. #endif
  74. }
  75.  
  76. void after_thread_ran_arch(void)
  77. {
  78. }
  79.  
  80. /** @}
  81.  */
  82.