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  1. /*
  2.  * Copyright (C) 2001-2004 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 <arch/mm/page.h>
  30. #include <arch/mm/frame.h>
  31. #include <mm/page.h>
  32. #include <mm/frame.h>
  33. #include <arch/interrupt.h>
  34. #include <arch/asm.h>
  35. #include <config.h>
  36. #include <memstr.h>
  37.  
  38. __address bootstrap_dba;
  39.  
  40. void page_arch_init(void)
  41. {
  42.     __address dba;
  43.     __address cur;
  44.  
  45.     if (config.cpu_active == 1) {
  46.         dba = frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME);
  47.         memsetb(dba, PAGE_SIZE, 0);
  48.  
  49.         bootstrap_dba = dba;
  50.  
  51.         /*
  52.          * PA2KA(identity) mapping for all frames.
  53.          */
  54.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  55.             page_mapping_insert(PA2KA(cur), cur, PAGE_CACHEABLE | PAGE_EXEC, KA2PA(dba));
  56.         }
  57.  
  58.         trap_register(14, page_fault);
  59.         write_cr3(KA2PA(dba));
  60.     }
  61.     else {
  62.         /*
  63.          * Application processors need to create their own view of the
  64.          * virtual address space. Because of that, each AP copies
  65.          * already-initialized paging information from the bootstrap
  66.          * processor and adjusts it to fulfill its needs.
  67.          */
  68.  
  69.         dba = frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME);
  70.         memcpy((void *)dba, (void *)bootstrap_dba , PAGE_SIZE);
  71.         write_cr3(KA2PA(dba));
  72.     }
  73. }
  74.