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  1. /*
  2.  * Copyright (C) 2003-2004 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. #include <arch/mm/tlb.h>
  30. #include <arch/mm/asid.h>
  31. #include <mm/tlb.h>
  32. #include <mm/page.h>
  33. #include <mm/vm.h>
  34. #include <arch/cp0.h>
  35. #include <panic.h>
  36. #include <arch.h>
  37. #include <symtab.h>
  38. #include <synch/spinlock.h>
  39. #include <print.h>
  40.  
  41. static void tlb_refill_fail(struct exception_regdump *pstate);
  42. static void tlb_invalid_fail(struct exception_regdump *pstate);
  43. static void tlb_modified_fail(struct exception_regdump *pstate);
  44.  
  45. /** Initialize TLB
  46.  *
  47.  * Initialize TLB.
  48.  * Invalidate all entries and mark wired entries.
  49.  */
  50. void tlb_init_arch(void)
  51. {
  52.     int i;
  53.  
  54.     cp0_pagemask_write(TLB_PAGE_MASK_16K);
  55.     cp0_entry_hi_write(0);
  56.     cp0_entry_lo0_write(0);
  57.     cp0_entry_lo1_write(0);
  58.  
  59.     /*
  60.      * Invalidate all entries.
  61.      */
  62.     for (i = 0; i < TLB_SIZE; i++) {
  63.         cp0_index_write(i);
  64.         tlbwi();
  65.     }
  66.    
  67.     /*
  68.      * The kernel is going to make use of some wired
  69.      * entries (e.g. mapping kernel stacks in kseg3).
  70.      */
  71.     cp0_wired_write(TLB_WIRED);
  72. }
  73.  
  74. /** Process TLB Refill Exception
  75.  *
  76.  * Process TLB Refill Exception.
  77.  *
  78.  * @param pstate Interrupted register context.
  79.  */
  80. void tlb_refill(struct exception_regdump *pstate)
  81. {
  82.     struct entry_hi hi;
  83.     __address badvaddr;
  84.     pte_t *pte;
  85.    
  86.     *((__u32 *) &hi) = cp0_entry_hi_read();
  87.     badvaddr = cp0_badvaddr_read();
  88.    
  89.     spinlock_lock(&VM->lock);
  90.  
  91.     /*
  92.      * Refill cannot succeed if the ASIDs don't match.
  93.      */
  94.     if (hi.asid != VM->asid)
  95.         goto fail;
  96.  
  97.     /*
  98.      * Refill cannot succeed if badvaddr is not
  99.      * associated with any mapping.
  100.      */
  101.     pte = find_mapping(badvaddr, 0);
  102.     if (!pte)
  103.         goto fail;
  104.        
  105.     /*
  106.      * Refill cannot succeed if the mapping is marked as invalid.
  107.      */
  108.     if (!pte->v)
  109.         goto fail;
  110.  
  111.     /*
  112.      * New entry is to be inserted into TLB
  113.      */
  114.     cp0_pagemask_write(TLB_PAGE_MASK_16K);
  115.     if ((badvaddr/PAGE_SIZE) % 2 == 0) {
  116.         cp0_entry_lo0_write(*((__u32 *) pte));
  117.         cp0_entry_lo1_write(0);
  118.     }
  119.     else {
  120.         cp0_entry_lo0_write(0);
  121.         cp0_entry_lo1_write(*((__u32 *) pte));
  122.     }
  123.     tlbwr();
  124.  
  125.     spinlock_unlock(&VM->lock);
  126.     return;
  127.    
  128. fail:
  129.     spinlock_unlock(&VM->lock);
  130.     tlb_refill_fail(pstate);
  131. }
  132.  
  133. void tlb_invalid(struct exception_regdump *pstate)
  134. {
  135.     tlb_invalid_fail(pstate);
  136. }
  137.  
  138. void tlb_modified(struct exception_regdump *pstate)
  139. {
  140.     tlb_modified_fail(pstate);
  141. }
  142.  
  143. void tlb_refill_fail(struct exception_regdump *pstate)
  144. {
  145.     char *symbol = "";
  146.     char *sym2 = "";
  147.  
  148.     char *s = get_symtab_entry(pstate->epc);
  149.     if (s)
  150.         symbol = s;
  151.     s = get_symtab_entry(pstate->ra);
  152.     if (s)
  153.         sym2 = s;
  154.     panic("%X: TLB Refill Exception at %X(%s<-%s)\n", cp0_badvaddr_read(), pstate->epc, symbol, sym2);
  155. }
  156.  
  157.  
  158. void tlb_invalid_fail(struct exception_regdump *pstate)
  159. {
  160.     char *symbol = "";
  161.  
  162.     char *s = get_symtab_entry(pstate->epc);
  163.     if (s)
  164.         symbol = s;
  165.     panic("%X: TLB Invalid Exception at %X(%s)\n", cp0_badvaddr_read(),
  166.           pstate->epc, symbol);
  167. }
  168.  
  169. void tlb_modified_fail(struct exception_regdump *pstate)
  170. {
  171.     char *symbol = "";
  172.  
  173.     char *s = get_symtab_entry(pstate->epc);
  174.     if (s)
  175.         symbol = s;
  176.     panic("%X: TLB Modified Exception at %X(%s)\n", cp0_badvaddr_read(),
  177.           pstate->epc, symbol);
  178. }
  179.  
  180.  
  181. void tlb_invalidate(int asid)
  182. {
  183.     pri_t pri;
  184.    
  185.     pri = cpu_priority_high();
  186.    
  187.     // TODO
  188.    
  189.     cpu_priority_restore(pri);
  190. }
  191.