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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 is mapped in DTR. */
  51. void before_thread_runs_arch(void)
  52. {
  53.     uintptr_t base;
  54.    
  55.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  56.  
  57.     if ((uintptr_t) THREAD->kstack < base || (uintptr_t) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) {
  58.         /*
  59.          * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
  60.          * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
  61.          */
  62.          
  63.         /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
  64.         dtr_purge((uintptr_t) THREAD->kstack, PAGE_WIDTH+1);
  65.        
  66.         /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
  67.         dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1);
  68.         dtlb_kernel_mapping_insert((uintptr_t) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2);
  69.     }
  70.    
  71.     /*
  72.      * Record address of kernel backing store to bank 0 r22.
  73.      * Record address of kernel stack to bank 0 r23.
  74.      * These values will be found there after switch from userspace.
  75.      */
  76.     __asm__ volatile (
  77.         "bsw.0\n"
  78.         "mov r22 = %0\n"
  79.         "mov r23 = %1\n"
  80.         "bsw.1\n"
  81.         :
  82.         : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
  83.           "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
  84.         );
  85. }
  86.  
  87. void after_thread_ran_arch(void)
  88. {
  89. }
  90.  
  91.  /** @}
  92.  */
  93.  
  94.