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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 ia64proc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <proc/scheduler.h>
  36. #include <proc/thread.h>
  37. #include <arch.h>
  38. #include <arch/register.h>
  39. #include <arch/context.h>
  40. #include <arch/stack.h>
  41. #include <arch/mm/tlb.h>
  42. #include <config.h>
  43. #include <align.h>
  44.  
  45. /** Perform ia64 specific tasks needed before the new task is run. */
  46. void before_task_runs_arch(void)
  47. {
  48. }
  49.  
  50. /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack
  51.  * is mapped in DTR.
  52.  */
  53. void before_thread_runs_arch(void)
  54. {
  55.     uintptr_t base;
  56.    
  57.     base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
  58.  
  59.     if ((uintptr_t) THREAD->kstack < base ||
  60.         (uintptr_t) THREAD->kstack > base + (1 << (KERNEL_PAGE_WIDTH))) {
  61.         /*
  62.          * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
  63.          * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
  64.          */
  65.          
  66.         /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
  67.         dtr_purge((uintptr_t) THREAD->kstack, PAGE_WIDTH+1);
  68.        
  69.         /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
  70.         dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack,
  71.             KA2PA(THREAD->kstack), true, DTR_KSTACK1);
  72.         dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack +
  73.             PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true,
  74.             DTR_KSTACK2);
  75.     }
  76.    
  77.     /*
  78.      * Record address of kernel backing store to bank 0 r22.
  79.      * Record address of kernel stack to bank 0 r23.
  80.      * These values will be found there after switch from userspace.
  81.      */
  82.     asm volatile (
  83.         "bsw.0\n"
  84.         "mov r22 = %0\n"
  85.         "mov r23 = %1\n"
  86.         "bsw.1\n"
  87.         :
  88.         : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
  89.           "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
  90.         );
  91. }
  92.  
  93. void after_thread_ran_arch(void)
  94. {
  95. }
  96.  
  97. /** @}
  98.  */
  99.