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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/types.h>
  30. #include <config.h>
  31. #include <func.h>
  32. #include <mm/frame.h>
  33. #include <mm/page.h>
  34. #include <arch/mm/page.h>
  35. #include <arch/interrupt.h>
  36. #include <arch/asm.h>
  37. #include <synch/spinlock.h>
  38. #include <debug.h>
  39. #include <memstr.h>
  40. #include <print.h>
  41.  
  42. __address bootstrap_dba;
  43.  
  44. void page_arch_init(void)
  45. {
  46.     __address dba;
  47.     __u32 i;
  48.  
  49.     if (config.cpu_active == 1) {
  50.         dba = frame_alloc(FRAME_KA | FRAME_PANIC);
  51.         memsetb(dba, PAGE_SIZE, 0);
  52.  
  53.         bootstrap_dba = dba;
  54.        
  55.         /*
  56.          * PA2KA(identity) mapping for all frames.
  57.          */
  58.         for (i = 0; i < config.memory_size/PAGE_SIZE; i++)
  59.             page_mapping_insert(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
  60.  
  61.         trap_register(14, page_fault);
  62.         write_cr3(KA2PA(dba));
  63.     }
  64.     else {
  65.         /*
  66.          * Application processors need to create their own view of the
  67.          * virtual address space. Because of that, each AP copies
  68.          * already-initialized paging information from the bootstrap
  69.          * processor and adjusts it to fulfill its needs.
  70.          */
  71.  
  72.         dba = frame_alloc(FRAME_KA | FRAME_PANIC);
  73.         memcpy((void *)dba, (void *)bootstrap_dba , PAGE_SIZE);
  74.         write_cr3(KA2PA(dba));
  75.     }
  76.  
  77.     paging_on();
  78. }
  79.