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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. #include <typedefs.h>
  34.  
  35. #define TLB_ENTRY_COUNT     48
  36.  
  37. #define TLB_WIRED       1
  38. #define TLB_KSTACK_WIRED_INDEX  0
  39.  
  40. #define TLB_PAGE_MASK_16K   (0x3<<13)
  41.  
  42. #define PAGE_UNCACHED           2
  43. #define PAGE_CACHEABLE_EXC_WRITE    5
  44.  
  45. typedef union entry_lo entry_lo_t;
  46. typedef union entry_hi entry_hi_t;
  47. typedef union page_mask page_mask_t;
  48. typedef union index tlb_index_t;
  49.  
  50. union entry_lo {
  51.     struct {
  52.         unsigned g : 1;     /* global bit */
  53.         unsigned v : 1;     /* valid bit */
  54.         unsigned d : 1;     /* dirty/write-protect bit */
  55.         unsigned c : 3;     /* cache coherency attribute */
  56.         unsigned pfn : 24;  /* frame number */
  57.         unsigned : 2;       /* zero */
  58.     } __attribute__ ((packed));
  59.     __u32 value;
  60. };
  61.  
  62. union pte {
  63.     entry_lo_t lo;
  64.     struct {
  65.         unsigned : 30;
  66.         unsigned w : 1;     /* writable */
  67.         unsigned a : 1;     /* accessed */
  68.     } __attribute__ ((packed));
  69. };
  70.  
  71. union entry_hi {
  72.     struct {
  73.         unsigned asid : 8;
  74.         unsigned : 5;
  75.         unsigned vpn2 : 19;
  76.     } __attribute__ ((packed));
  77.     __u32 value;
  78. };
  79.  
  80. union page_mask {
  81.     struct {
  82.         unsigned : 13;
  83.         unsigned mask : 12;
  84.         unsigned : 7;
  85.     } __attribute__ ((packed));
  86.     __u32 value;
  87. };
  88.  
  89. union index {
  90.     struct {
  91.         unsigned index : 4;
  92.         unsigned : 27;
  93.         unsigned p : 1;
  94.     } __attribute__ ((packed));
  95.     __u32 value;
  96. };
  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.