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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 ia32proc
  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/pm.h>
  42. #include <arch/asm.h>
  43. #include <arch/ddi/ddi.h>
  44.  
  45. /** Perform ia32 specific tasks needed before the new task is run.
  46.  *
  47.  * Interrupts are disabled.
  48.  */
  49. void before_task_runs_arch(void)
  50. {
  51.     io_perm_bitmap_install();
  52. }
  53.  
  54. /** Perform ia32 specific tasks needed before the new thread is scheduled.
  55.  *
  56.  * THREAD is locked and interrupts are disabled.
  57.  */
  58. void before_thread_runs_arch(void)
  59. {
  60.     uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
  61.         SP_DELTA];
  62.    
  63.     /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
  64.     write_msr(IA32_MSR_SYSENTER_ESP, kstk);
  65.    
  66.     /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
  67.     CPU->arch.tss->esp0 = kstk;
  68.     CPU->arch.tss->ss0 = gdtselector(KDATA_DES);
  69.    
  70.     /* Set up TLS in GS register */
  71.     set_tls_desc(THREAD->arch.tls);
  72. }
  73.  
  74. void after_thread_ran_arch(void)
  75. {
  76. }
  77.  
  78. /** @}
  79.  */
  80.