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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.  /** @addtogroup ia32mm ia32
  30.  * @ingroup mm
  31.  * @{
  32.  */
  33. /** @file
  34.  * @ingroup ia32
  35.  */
  36.  
  37. #include <arch/mm/page.h>
  38. #include <genarch/mm/page_pt.h>
  39. #include <arch/mm/frame.h>
  40. #include <mm/frame.h>
  41. #include <mm/page.h>
  42. #include <mm/as.h>
  43. #include <arch/types.h>
  44. #include <align.h>
  45. #include <config.h>
  46. #include <func.h>
  47. #include <arch/interrupt.h>
  48. #include <arch/asm.h>
  49. #include <debug.h>
  50. #include <memstr.h>
  51. #include <print.h>
  52. #include <interrupt.h>
  53.  
  54. void page_arch_init(void)
  55. {
  56.     __address cur;
  57.     int flags;
  58.  
  59.     if (config.cpu_active == 1) {
  60.         page_mapping_operations = &pt_mapping_operations;
  61.    
  62.         /*
  63.          * PA2KA(identity) mapping for all frames until last_frame.
  64.          */
  65.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  66.             flags = PAGE_CACHEABLE;
  67.             if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
  68.                 flags |= PAGE_GLOBAL;
  69.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  70.         }
  71.  
  72.         exc_register(14, "page_fault", (iroutine) page_fault);
  73.         write_cr3((__address) AS_KERNEL->page_table);
  74.     }
  75.     else {
  76.         write_cr3((__address) AS_KERNEL->page_table);
  77.     }
  78.  
  79.     paging_on();
  80. }
  81.  
  82.  
  83. __address hw_map(__address physaddr, size_t size)
  84. {
  85.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
  86.         panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
  87.    
  88.     __address virtaddr = PA2KA(last_frame);
  89.     pfn_t i;
  90.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
  91.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
  92.    
  93.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  94.    
  95.     return virtaddr;
  96. }
  97.  
  98. void page_fault(int n, istate_t *istate)
  99. {
  100.         __address page;
  101.     pf_access_t access;
  102.    
  103.         page = read_cr2();
  104.        
  105.         if (istate->error_word & PFERR_CODE_RSVD)
  106.         panic("Reserved bit set in page directory.\n");
  107.  
  108.     if (istate->error_word & PFERR_CODE_RW)
  109.         access = PF_ACCESS_WRITE;
  110.     else
  111.         access = PF_ACCESS_READ;
  112.  
  113.         if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
  114.         fault_if_from_uspace(istate, "Page fault: %#x", page);
  115.  
  116.                 PRINT_INFO_ERRCODE(istate);
  117.                 printf("page fault address: %#x\n", page);
  118.                 panic("page fault\n");
  119.         }
  120. }
  121.  
  122.  /** @}
  123.  */
  124.  
  125.