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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 <genarch/drivers/ega/ega.h>
  38. #include <genarch/drivers/legacy/ia32/io.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. #include <ddi/ddi.h>
  54.  
  55. /** Physical memory area for devices. */
  56. static parea_t dev_area;
  57. static parea_t ega_area;
  58.  
  59. void page_arch_init(void)
  60. {
  61.     uintptr_t cur;
  62.     int flags;
  63.  
  64.     if (config.cpu_active == 1) {
  65.         page_mapping_operations = &pt_mapping_operations;
  66.    
  67.         /*
  68.          * PA2KA(identity) mapping for all frames until last_frame.
  69.          */
  70.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  71.             flags = PAGE_CACHEABLE | PAGE_WRITE;
  72.             if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
  73.                 flags |= PAGE_GLOBAL;
  74.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  75.         }
  76.  
  77.         exc_register(14, "page_fault", (iroutine) page_fault);
  78.         write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
  79.     } else
  80.         write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
  81.  
  82.     paging_on();
  83. }
  84.  
  85.  
  86. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  87. {
  88.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
  89.         panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
  90.    
  91.     uintptr_t virtaddr = PA2KA(last_frame);
  92.     pfn_t i;
  93.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
  94.         uintptr_t addr = PFN2ADDR(i);
  95.         page_mapping_insert(AS_KERNEL, virtaddr + addr, physaddr + addr, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  96.     }
  97.    
  98.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  99.    
  100.     return virtaddr;
  101. }
  102.  
  103. void hw_area(void)
  104. {
  105.     dev_area.pbase = end_frame;
  106.     dev_area.frames = SIZE2FRAMES(0xffffffff - end_frame);
  107.     ddi_parea_register(&dev_area);
  108.    
  109.     ega_area.pbase = EGA_VIDEORAM;
  110.     ega_area.frames = SIZE2FRAMES(EGA_VRAM_SIZE);
  111.     ddi_parea_register(&ega_area);
  112. }
  113.  
  114. void page_fault(int n __attribute__((unused)), istate_t *istate)
  115. {
  116.     uintptr_t page;
  117.     pf_access_t access;
  118.    
  119.     page = read_cr2();
  120.        
  121.     if (istate->error_word & PFERR_CODE_RSVD)
  122.         panic("Reserved bit set in page directory.");
  123.    
  124.     if (istate->error_word & PFERR_CODE_RW)
  125.         access = PF_ACCESS_WRITE;
  126.     else
  127.         access = PF_ACCESS_READ;
  128.    
  129.     if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
  130.         fault_if_from_uspace(istate, "Page fault: %#x.", page);
  131.        
  132.         decode_istate(istate);
  133.         printf("page fault address: %#lx\n", page);
  134.         panic("Page fault.");
  135.     }
  136. }
  137.  
  138. /** @}
  139.  */
  140.