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  1. /*
  2.  * Copyright (C) 2005 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/tlb.h>
  30. #include <mm/tlb.h>
  31. #include <arch/mm/frame.h>
  32. #include <arch/mm/page.h>
  33. #include <arch/mm/mmu.h>
  34. #include <print.h>
  35. #include <arch/types.h>
  36. #include <typedefs.h>
  37. #include <config.h>
  38. #include <arch/trap/trap.h>
  39.  
  40. /** Initialize ITLB and DTLB.
  41.  *
  42.  * The goal of this function is to disable MMU
  43.  * so that both TLBs can be purged and new
  44.  * kernel 4M locked entry can be installed.
  45.  * After TLB is initialized, MMU is enabled
  46.  * again.
  47.  *
  48.  * Switching MMU off imposes the requirement for
  49.  * the kernel to run in identity mapped environment.
  50.  */
  51. void tlb_arch_init(void)
  52. {
  53.     tlb_tag_access_reg_t tag;
  54.     tlb_data_t data;
  55.     frame_address_t fr;
  56.     page_address_t pg;
  57.  
  58.     fr.address = config.base;
  59.     pg.address = config.base;
  60.  
  61.     immu_disable();
  62.     dmmu_disable();
  63.    
  64.     /*
  65.      * We do identity mapping of 4M-page at 4M.
  66.      */
  67.     tag.value = 0;
  68.     tag.vpn = pg.vpn;
  69.  
  70.     itlb_tag_access_write(tag.value);
  71.     dtlb_tag_access_write(tag.value);
  72.  
  73.     data.value = 0;
  74.     data.v = true;
  75.     data.size = PAGESIZE_4M;
  76.     data.pfn = fr.pfn;
  77.     data.l = true;
  78.     data.cp = 1;
  79.     data.cv = 1;
  80.     data.p = true;
  81.     data.w = true;
  82.     data.g = true;
  83.  
  84.     itlb_data_in_write(data.value);
  85.     dtlb_data_in_write(data.value);
  86.  
  87.     /*
  88.      * Register window traps can occur before MMU is enabled again.
  89.      * This ensures that any such traps will be handled from
  90.      * kernel identity mapped trap handler.
  91.      */
  92.     trap_switch_trap_table();
  93.    
  94.     tlb_invalidate_all();
  95.  
  96.     dmmu_enable();
  97.     immu_enable();
  98. }
  99.  
  100. /** Print contents of both TLBs. */
  101. void tlb_print(void)
  102. {
  103.     int i;
  104.     tlb_data_t d;
  105.     tlb_tag_read_reg_t t;
  106.    
  107.     printf("I-TLB contents:\n");
  108.     for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
  109.         d.value = itlb_data_access_read(i);
  110.         t.value = itlb_tag_read_read(i);
  111.        
  112.         printf("%d: vpn=%Q, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%X, diag=%X, pfn=%X, soft=%X, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
  113.             i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
  114.     }
  115.  
  116.     printf("D-TLB contents:\n");
  117.     for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
  118.         d.value = dtlb_data_access_read(i);
  119.         t.value = dtlb_tag_read_read(i);
  120.        
  121.         printf("%d: vpn=%Q, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%X, diag=%X, pfn=%X, soft=%X, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
  122.             i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
  123.     }
  124.  
  125. }
  126.  
  127. /** Invalidate all unlocked ITLB and DTLB entries. */
  128. void tlb_invalidate_all(void)
  129. {
  130.     int i;
  131.     tlb_data_t d;
  132.     tlb_tag_read_reg_t t;
  133.  
  134.     for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
  135.         d.value = itlb_data_access_read(i);
  136.         if (!d.l) {
  137.             t.value = itlb_tag_read_read(i);
  138.             d.v = false;
  139.             itlb_tag_access_write(t.value);
  140.             itlb_data_access_write(i, d.value);
  141.         }
  142.     }
  143.    
  144.     for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
  145.         d.value = dtlb_data_access_read(i);
  146.         if (!d.l) {
  147.             t.value = dtlb_tag_read_read(i);
  148.             d.v = false;
  149.             dtlb_tag_access_write(t.value);
  150.             dtlb_data_access_write(i, d.value);
  151.         }
  152.     }
  153.    
  154. }
  155.  
  156. /** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).
  157.  *
  158.  * @param asid Address Space ID.
  159.  */
  160. void tlb_invalidate_asid(asid_t asid)
  161. {
  162.     /* TODO: write asid to some Context register and encode the register in second parameter below. */
  163.     itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_NUCLEUS, 0);
  164.     dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_NUCLEUS, 0);
  165. }
  166.  
  167. /** Invalidate all ITLB and DTLB entries for specified page range in specified address space.
  168.  *
  169.  * @param asid Address Space ID.
  170.  * @param page First page which to sweep out from ITLB and DTLB.
  171.  * @param cnt Number of ITLB and DTLB entries to invalidate.
  172.  */
  173. void tlb_invalidate_pages(asid_t asid, __address page, count_t cnt)
  174. {
  175.     int i;
  176.    
  177.     for (i = 0; i < cnt; i++) {
  178.         /* TODO: write asid to some Context register and encode the register in second parameter below. */
  179.         itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, page + i * PAGE_SIZE);
  180.         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, page + i * PAGE_SIZE);
  181.     }
  182. }
  183.