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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 zero: 2;   /* zero */
  51. } __attribute__ ((packed));
  52.  
  53. struct pte {
  54.     unsigned g : 1;     /* global bit */
  55.     unsigned v : 1;     /* valid bit */
  56.     unsigned d : 1;     /* dirty/write-protect bit */
  57.     unsigned c : 3;     /* cache coherency attribute */
  58.     unsigned pfn : 24;  /* frame number */
  59.     unsigned w : 1;     /* writable */
  60.     unsigned a : 1;     /* accessed */
  61. } __attribute__ ((packed));
  62.  
  63. struct entry_hi {
  64.     unsigned asid : 8;
  65.     unsigned : 5;
  66.     unsigned vpn2 : 19;
  67. } __attribute__ ((packed));
  68.  
  69. struct page_mask {
  70.     unsigned : 13;
  71.     unsigned mask : 12;
  72.     unsigned : 7;
  73. } __attribute__ ((packed));
  74.  
  75. struct index {
  76.     unsigned index : 4;
  77.     unsigned : 27;
  78.     unsigned p : 1;
  79. } __attribute__ ((packed));
  80.  
  81. /** Probe TLB for Matching Entry
  82.  *
  83.  * Probe TLB for Matching Entry.
  84.  */
  85. static inline void tlbp(void)
  86. {
  87.     __asm__ volatile ("tlbp\n\t");
  88. }
  89.  
  90.  
  91. /** Read Indexed TLB Entry
  92.  *
  93.  * Read Indexed TLB Entry.
  94.  */
  95. static inline void tlbr(void)
  96. {
  97.     __asm__ volatile ("tlbr\n\t");
  98. }
  99.  
  100. /** Write Indexed TLB Entry
  101.  *
  102.  * Write Indexed TLB Entry.
  103.  */
  104. static inline void tlbwi(void)
  105. {
  106.     __asm__ volatile ("tlbwi\n\t");
  107. }
  108.  
  109. /** Write Random TLB Entry
  110.  *
  111.  * Write Random TLB Entry.
  112.  */
  113. static inline void tlbwr(void)
  114. {
  115.     __asm__ volatile ("tlbwr\n\t");
  116. }
  117.  
  118. extern void tlb_invalid(struct exception_regdump *pstate);
  119. extern void tlb_refill(struct exception_regdump *pstate);
  120. extern void tlb_modified(struct exception_regdump *pstate);
  121.  
  122. #endif
  123.