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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 : 4;
  56.     unsigned g : 1;
  57.     unsigned vpn2 : 19;
  58. } __attribute__ ((packed));
  59.  
  60. struct page_mask {
  61.     unsigned : 13;
  62.     unsigned mask : 12;
  63.     unsigned : 7;
  64. } __attribute__ ((packed));
  65.  
  66. struct tlb_entry {
  67.     struct entry_lo lo0;
  68.     struct entry_lo lo1;
  69.     struct entry_hi hi;
  70.     struct page_mask mask;
  71. } __attribute__ ((packed));
  72.  
  73. typedef struct entry_lo pte_t;
  74.  
  75. /** Read Indexed TLB Entry
  76.  *
  77.  * Read Indexed TLB Entry.
  78.  */
  79. static inline void tlbr(void)
  80. {
  81.     __asm__ volatile ("tlbr\n\t");
  82. }
  83.  
  84. /** Write Indexed TLB Entry
  85.  *
  86.  * Write Indexed TLB Entry.
  87.  */
  88. static inline void tlbwi(void)
  89. {
  90.     __asm__ volatile ("tlbwi\n\t");
  91. }
  92.  
  93. /** Write Random TLB Entry
  94.  *
  95.  * Write Random TLB Entry.
  96.  */
  97. static inline void tlbwr(void)
  98. {
  99.     __asm__ volatile ("tlbwr\n\t");
  100. }
  101.  
  102. extern void tlb_invalid(struct exception_regdump *pstate);
  103. extern void tlb_refill(struct exception_regdump *pstate);
  104. extern void tlb_modified(struct exception_regdump *pstate);
  105.  
  106. #endif
  107.