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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 <arch/cp0.h>
  33. #include <panic.h>
  34. #include <arch.h>
  35. #include <symtab.h>
  36.  
  37. void tlb_init_arch(void)
  38. {
  39.     int i;
  40.  
  41.     cp0_pagemask_write(TLB_PAGE_MASK_16K);
  42.     cp0_entry_hi_write(0);
  43.     cp0_entry_lo0_write(0);
  44.     cp0_entry_lo1_write(0);
  45.  
  46.     /*
  47.      * Invalidate all entries.
  48.      */
  49.     for (i = 0; i < TLB_SIZE; i++) {
  50.         cp0_index_write(0);
  51.         tlbwi();
  52.     }
  53.    
  54.     /*
  55.      * The kernel is going to make use of some wired
  56.      * entries (e.g. mapping kernel stacks).
  57.      */
  58.     cp0_wired_write(TLB_WIRED);
  59. }
  60.  
  61. void tlb_refill(struct exception_regdump *pstate)
  62. {
  63.     char *symbol = "";
  64.     char *sym2 = "";
  65.  
  66.     char *s = get_symtab_entry(pstate->epc);
  67.     if (s)
  68.         symbol = s;
  69.     s = get_symtab_entry(pstate->ra);
  70.     if (s)
  71.         sym2 = s;
  72.     panic("%X: TLB Refill Exception at %X(%s<-%s)\n", cp0_badvaddr_read(),
  73.           pstate->epc, symbol, sym2);
  74. }
  75.  
  76. void tlb_invalid(struct exception_regdump *pstate)
  77. {
  78.     char *symbol = "";
  79.  
  80.     char *s = get_symtab_entry(pstate->epc);
  81.     if (s)
  82.         symbol = s;
  83.     panic("%X: TLB Invalid Exception at %X(%s)\n", cp0_badvaddr_read(),
  84.           pstate->epc, symbol);
  85. }
  86.  
  87. void tlb_modified(struct exception_regdump *pstate)
  88. {
  89.     char *symbol = "";
  90.  
  91.     char *s = get_symtab_entry(pstate->epc);
  92.     if (s)
  93.         symbol = s;
  94.     panic("%X: TLB Modified Exception at %X(%s)\n", cp0_badvaddr_read(),
  95.           pstate->epc, symbol);
  96. }
  97.  
  98.  
  99. void tlb_invalidate(int asid)
  100. {
  101.     pri_t pri;
  102.    
  103.     pri = cpu_priority_high();
  104.    
  105. //  asid_bitmap_reset();
  106.    
  107.     // TODO
  108.    
  109.     cpu_priority_restore(pri);
  110. }
  111.