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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. union entry_lo {
  45.     struct {
  46.         unsigned g : 1;     /* global bit */
  47.         unsigned v : 1;     /* valid bit */
  48.         unsigned d : 1;     /* dirty/write-protect bit */
  49.         unsigned c : 3;     /* cache coherency attribute */
  50.         unsigned pfn : 24;  /* frame number */
  51.         unsigned : 2;       /* zero */
  52.     } __attribute__ ((packed));
  53.     __u32 value;
  54. };
  55.  
  56. struct pte {
  57.     unsigned g : 1;     /* global bit */
  58.     unsigned v : 1;     /* valid bit */
  59.     unsigned d : 1;     /* dirty/write-protect bit */
  60.     unsigned c : 3;     /* cache coherency attribute */
  61.     unsigned pfn : 24;  /* frame number */
  62.     unsigned w : 1;     /* writable */
  63.     unsigned a : 1;     /* accessed */
  64. } __attribute__ ((packed));
  65.  
  66. union entry_hi {
  67.     struct {
  68.         unsigned asid : 8;
  69.         unsigned : 5;
  70.         unsigned vpn2 : 19;
  71.     } __attribute__ ((packed));
  72.     __u32 value;
  73. };
  74.  
  75. union page_mask {
  76.     struct {
  77.         unsigned : 13;
  78.         unsigned mask : 12;
  79.         unsigned : 7;
  80.     } __attribute__ ((packed));
  81.     __u32 value;
  82. };
  83.  
  84. union index {
  85.     struct {
  86.         unsigned index : 4;
  87.         unsigned : 27;
  88.         unsigned p : 1;
  89.     } __attribute__ ((packed));
  90.     __u32 value;
  91. };
  92.  
  93. typedef union entry_lo entry_lo_t;
  94. typedef union entry_hi entry_hi_t;
  95. typedef union page_mask page_mask_t;
  96. typedef union index tlb_index_t;
  97.  
  98. /** Probe TLB for Matching Entry
  99.  *
  100.  * Probe TLB for Matching Entry.
  101.  */
  102. static inline void tlbp(void)
  103. {
  104.     __asm__ volatile ("tlbp\n\t");
  105. }
  106.  
  107.  
  108. /** Read Indexed TLB Entry
  109.  *
  110.  * Read Indexed TLB Entry.
  111.  */
  112. static inline void tlbr(void)
  113. {
  114.     __asm__ volatile ("tlbr\n\t");
  115. }
  116.  
  117. /** Write Indexed TLB Entry
  118.  *
  119.  * Write Indexed TLB Entry.
  120.  */
  121. static inline void tlbwi(void)
  122. {
  123.     __asm__ volatile ("tlbwi\n\t");
  124. }
  125.  
  126. /** Write Random TLB Entry
  127.  *
  128.  * Write Random TLB Entry.
  129.  */
  130. static inline void tlbwr(void)
  131. {
  132.     __asm__ volatile ("tlbwr\n\t");
  133. }
  134.  
  135. extern void tlb_invalid(struct exception_regdump *pstate);
  136. extern void tlb_refill(struct exception_regdump *pstate);
  137. extern void tlb_modified(struct exception_regdump *pstate);
  138.  
  139. #endif
  140.