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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 amd64mm
  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/page.h>
  39. #include <mm/frame.h>
  40. #include <mm/as.h>
  41. #include <arch/interrupt.h>
  42. #include <arch/asm.h>
  43. #include <config.h>
  44. #include <memstr.h>
  45. #include <interrupt.h>
  46. #include <print.h>
  47. #include <panic.h>
  48. #include <align.h>
  49.  
  50. /* Definitions for identity page mapper */
  51. pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
  52. pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
  53. pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
  54. extern pte_t ptl_0; /* From boot.S */
  55.  
  56. #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  57. #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  58. #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  59.  
  60. #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
  61. #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
  62. #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
  63.  
  64. #define SETUP_PTL1(ptl0, page, tgt)  {  \
  65.     SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
  66.         SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  67.     }
  68. #define SETUP_PTL2(ptl1, page, tgt)  {  \
  69.     SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
  70.         SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  71.     }
  72. #define SETUP_PTL3(ptl2, page, tgt)  {  \
  73.     SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
  74.         SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  75.     }
  76. #define SETUP_FRAME(ptl3, page, tgt)  { \
  77.     SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
  78.         SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  79.     }
  80.  
  81.  
  82. void page_arch_init(void)
  83. {
  84.     uintptr_t cur;
  85.     unsigned int i;
  86.     int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
  87.  
  88.     if (config.cpu_active == 1) {
  89.         page_mapping_operations = &pt_mapping_operations;
  90.  
  91.         /*
  92.          * PA2KA(identity) mapping for all frames.
  93.          */
  94.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  95.             /* Standard identity mapping */
  96.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
  97.         }
  98.        
  99.         /* Upper kernel mapping
  100.          * - from zero to top of kernel (include bottom addresses
  101.          *   because some are needed for init)
  102.          */
  103.         for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
  104.             page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
  105.        
  106.         for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
  107.             page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
  108.        
  109.         for (i = 0; i < init.cnt; i++) {
  110.             for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
  111.                 page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
  112.         }
  113.  
  114.         exc_register(14, "page_fault", (iroutine) page_fault);
  115.         write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
  116.     } else
  117.         write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
  118. }
  119.  
  120.  
  121. /** Identity page mapper
  122.  *
  123.  * We need to map whole physical memory identically before the page subsystem
  124.  * is initializaed. This thing clears page table and fills in the specific
  125.  * items.
  126.  */
  127. void ident_page_fault(int n, istate_t *istate)
  128. {
  129.     uintptr_t page;
  130.     static uintptr_t oldpage = 0;
  131.     pte_t *aptl_1, *aptl_2, *aptl_3;
  132.  
  133.     page = read_cr2();
  134.     if (oldpage) {
  135.         /* Unmap old address */
  136.         aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
  137.         aptl_2 = PTL2_ADDR(aptl_1, oldpage);
  138.         aptl_3 = PTL3_ADDR(aptl_2, oldpage);
  139.  
  140.         SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  141.         if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
  142.             SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  143.         if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
  144.             SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  145.         if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
  146.             SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  147.     }
  148.     if (PTL1_PRESENT(&ptl_0, page))
  149.         aptl_1 = PTL1_ADDR(&ptl_0, page);
  150.     else {
  151.         SETUP_PTL1(&ptl_0, page, helper_ptl1);
  152.         aptl_1 = helper_ptl1;
  153.     }
  154.        
  155.     if (PTL2_PRESENT(aptl_1, page))
  156.         aptl_2 = PTL2_ADDR(aptl_1, page);
  157.     else {
  158.         SETUP_PTL2(aptl_1, page, helper_ptl2);
  159.         aptl_2 = helper_ptl2;
  160.     }
  161.  
  162.     if (PTL3_PRESENT(aptl_2, page))
  163.         aptl_3 = PTL3_ADDR(aptl_2, page);
  164.     else {
  165.         SETUP_PTL3(aptl_2, page, helper_ptl3);
  166.         aptl_3 = helper_ptl3;
  167.     }
  168.    
  169.     SETUP_FRAME(aptl_3, page, page);
  170.  
  171.     oldpage = page;
  172. }
  173.  
  174.  
  175. void page_fault(int n, istate_t *istate)
  176. {
  177.     uintptr_t page;
  178.     pf_access_t access;
  179.    
  180.     page = read_cr2();
  181.    
  182.     if (istate->error_word & PFERR_CODE_RSVD)
  183.         panic("Reserved bit set in page table entry.");
  184.    
  185.     if (istate->error_word & PFERR_CODE_RW)
  186.         access = PF_ACCESS_WRITE;
  187.     else if (istate->error_word & PFERR_CODE_ID)
  188.         access = PF_ACCESS_EXEC;
  189.     else
  190.         access = PF_ACCESS_READ;
  191.    
  192.     if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
  193.         fault_if_from_uspace(istate, "Page fault: %#x.", page);
  194.  
  195.         decode_istate(n, istate);
  196.         printf("Page fault address: %llx.\n", page);
  197.         panic("Page fault.");
  198.     }
  199. }
  200.  
  201.  
  202. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  203. {
  204.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
  205.         panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
  206.    
  207.     uintptr_t virtaddr = PA2KA(last_frame);
  208.     pfn_t i;
  209.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
  210.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE);
  211.    
  212.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  213.    
  214.     return virtaddr;
  215. }
  216.  
  217. /** @}
  218.  */
  219.