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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. #include <proc/scheduler.h>
  30. #include <proc/thread.h>
  31. #include <arch.h>
  32. #include <arch/register.h>
  33. #include <arch/context.h>
  34. #include <arch/stack.h>
  35. #include <arch/mm/tlb.h>
  36. #include <config.h>
  37. #include <align.h>
  38.  
  39. /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */
  40. void before_thread_runs_arch(void)
  41. {
  42.     __address base;
  43.    
  44.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  45.  
  46.     if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
  47.         /*
  48.          * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
  49.          * Use DTR[TR_KSTACK] to map it.
  50.          */
  51.          dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK);
  52.     }
  53.    
  54.     /*
  55.      * Record address of kernel backing store to bank 0 r22.
  56.      * Record address of kernel stack to bank 0 r23.
  57.      * These values will be found there after switch from userspace.
  58.      */
  59.     __asm__ volatile (
  60.         "bsw.0\n"
  61.         "mov r22 = %0\n"
  62.         "mov r23 = %1\n"
  63.         "bsw.1\n"
  64.         :
  65.         : "r" (((__address) THREAD->kstack) + ALIGN_UP(sizeof(the_t), REGISTER_STACK_ALIGNMENT)),
  66.           "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA]));
  67. }
  68.  
  69. void after_thread_ran_arch(void)
  70. {
  71. }
  72.