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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. #ifndef __mips_TLB_H__
  30. #define __mips_TLB_H__
  31.  
  32. #define PAGE_UNCACHED           2
  33. #define PAGE_CACHEABLE_EXC_WRITE    5
  34.  
  35. struct entry_lo {
  36.     unsigned g : 1;     /* global bit */
  37.     unsigned v : 1;     /* valid bit */
  38.     unsigned d : 1;     /* dirty/write-protect bit */
  39.     unsigned c : 3;     /* cache coherency attribute */
  40.     unsigned pfn : 24;  /* frame number */
  41.     unsigned : 2;
  42. } __attribute__ ((packed));
  43.  
  44. struct entry_hi {
  45.     unsigned asid : 8;
  46.     unsigned : 4;
  47.     unsigned g : 1;
  48.     unsigned vpn2 : 19;
  49. } __attribute__ ((packed));
  50.  
  51. struct page_mask {
  52.     unsigned : 13;
  53.     unsigned mask : 12;
  54.     unsigned : 7;
  55. } __attribute__ ((packed));
  56.  
  57. struct tlb_entry {
  58.     struct entry_lo lo0;
  59.     struct entry_lo lo1;
  60.     struct entry_hi hi;
  61.     struct page_mask mask;
  62. } __attribute__ ((packed));
  63.  
  64. typedef struct entry_lo pte_t;
  65.  
  66. extern void tlb_refill(void);
  67. extern void tlb_invalid(void);
  68.  
  69. #endif
  70.