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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. #ifndef __mips32_TLB_H__
  30. #define __mips32_TLB_H__
  31.  
  32. #include <arch/exception.h>
  33.  
  34. #define TLB_SIZE    48
  35.  
  36. #define TLB_WIRED       1
  37. #define TLB_KSTACK_WIRED_INDEX  0
  38.  
  39. #define TLB_PAGE_MASK_16K   (0x3<<13)
  40.  
  41. #define PAGE_UNCACHED           2
  42. #define PAGE_CACHEABLE_EXC_WRITE    5
  43.  
  44. struct entry_lo {
  45.     unsigned g : 1;     /* global bit */
  46.     unsigned v : 1;     /* valid bit */
  47.     unsigned d : 1;     /* dirty/write-protect bit */
  48.     unsigned c : 3;     /* cache coherency attribute */
  49.     unsigned pfn : 24;  /* frame number */
  50.     unsigned : 2;
  51. } __attribute__ ((packed));
  52.  
  53. struct entry_hi {
  54.     unsigned asid : 8;
  55.     unsigned : 5;
  56.     unsigned vpn2 : 19;
  57. } __attribute__ ((packed));
  58.  
  59. struct page_mask {
  60.     unsigned : 13;
  61.     unsigned mask : 12;
  62.     unsigned : 7;
  63. } __attribute__ ((packed));
  64.  
  65. struct tlb_entry {
  66.     struct entry_lo lo0;
  67.     struct entry_lo lo1;
  68.     struct entry_hi hi;
  69.     struct page_mask mask;
  70. } __attribute__ ((packed));
  71.  
  72.  
  73. /** Read Indexed TLB Entry
  74.  *
  75.  * Read Indexed TLB Entry.
  76.  */
  77. static inline void tlbr(void)
  78. {
  79.     __asm__ volatile ("tlbr\n\t");
  80. }
  81.  
  82. /** Write Indexed TLB Entry
  83.  *
  84.  * Write Indexed TLB Entry.
  85.  */
  86. static inline void tlbwi(void)
  87. {
  88.     __asm__ volatile ("tlbwi\n\t");
  89. }
  90.  
  91. /** Write Random TLB Entry
  92.  *
  93.  * Write Random TLB Entry.
  94.  */
  95. static inline void tlbwr(void)
  96. {
  97.     __asm__ volatile ("tlbwr\n\t");
  98. }
  99.  
  100. extern void tlb_invalid(struct exception_regdump *pstate);
  101. extern void tlb_refill(struct exception_regdump *pstate);
  102. extern void tlb_modified(struct exception_regdump *pstate);
  103.  
  104. #endif
  105.