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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 <genarch/mm/page_pt.h>
  31. #include <arch/mm/frame.h>
  32. #include <mm/frame.h>
  33. #include <mm/page.h>
  34. #include <mm/as.h>
  35. #include <arch/types.h>
  36. #include <align.h>
  37. #include <config.h>
  38. #include <func.h>
  39. #include <arch/interrupt.h>
  40. #include <arch/asm.h>
  41. #include <debug.h>
  42. #include <memstr.h>
  43. #include <print.h>
  44. #include <interrupt.h>
  45.  
  46.  
  47. void page_arch_init(void)
  48. {
  49.     __address cur;
  50.     int flags;
  51.  
  52.     if (config.cpu_active == 1) {
  53.         page_mapping_operations = &pt_mapping_operations;
  54.    
  55.         /*
  56.          * PA2KA(identity) mapping for all frames until last_frame.
  57.          */
  58.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  59.             flags = PAGE_CACHEABLE;
  60.             if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
  61.                 flags |= PAGE_GLOBAL;
  62.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  63.         }
  64.  
  65.         exc_register(14, "page_fault", (iroutine) page_fault);
  66.         write_cr3((__address) AS_KERNEL->page_table);
  67.     }
  68.     else {
  69.         write_cr3((__address) AS_KERNEL->page_table);
  70.     }
  71.  
  72.     paging_on();
  73. }
  74.  
  75.  
  76. __address hw_map(__address physaddr, size_t size)
  77. {
  78.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
  79.         panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
  80.    
  81.     __address virtaddr = PA2KA(last_frame);
  82.     pfn_t i;
  83.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
  84.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
  85.    
  86.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  87.    
  88.     return virtaddr;
  89. }
  90.