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