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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. #ifdef TLBCNT
  36. #   define TLB_ENTRY_COUNT      TLBCNT
  37. #else
  38. #   define TLB_ENTRY_COUNT      48
  39. #endif
  40.  
  41. #define TLB_WIRED       1
  42. #define TLB_KSTACK_WIRED_INDEX  0
  43.  
  44. #define TLB_PAGE_MASK_16K   (0x3<<13)
  45.  
  46. #define PAGE_UNCACHED           2
  47. #define PAGE_CACHEABLE_EXC_WRITE    5
  48.  
  49. typedef union entry_lo entry_lo_t;
  50. typedef union entry_hi entry_hi_t;
  51. typedef union page_mask page_mask_t;
  52. typedef union index tlb_index_t;
  53.  
  54. union entry_lo {
  55.     struct {
  56.         unsigned g : 1;     /* global bit */
  57.         unsigned v : 1;     /* valid bit */
  58.         unsigned d : 1;     /* dirty/write-protect bit */
  59.         unsigned c : 3;     /* cache coherency attribute */
  60.         unsigned pfn : 24;  /* frame number */
  61.         unsigned : 2;       /* zero */
  62.     } __attribute__ ((packed));
  63.     __u32 value;
  64. };
  65.  
  66. union pte {
  67.     entry_lo_t lo;
  68.     struct {
  69.         unsigned : 30;
  70.         unsigned w : 1;     /* writable */
  71.         unsigned a : 1;     /* accessed */
  72.     } __attribute__ ((packed));
  73. };
  74.  
  75. union entry_hi {
  76.     struct {
  77.         unsigned asid : 8;
  78.         unsigned : 5;
  79.         unsigned vpn2 : 19;
  80.     } __attribute__ ((packed));
  81.     __u32 value;
  82. };
  83.  
  84. union page_mask {
  85.     struct {
  86.         unsigned : 13;
  87.         unsigned mask : 12;
  88.         unsigned : 7;
  89.     } __attribute__ ((packed));
  90.     __u32 value;
  91. };
  92.  
  93. union index {
  94.     struct {
  95.         unsigned index : 4;
  96.         unsigned : 27;
  97.         unsigned p : 1;
  98.     } __attribute__ ((packed));
  99.     __u32 value;
  100. };
  101.  
  102. /** Probe TLB for Matching Entry
  103.  *
  104.  * Probe TLB for Matching Entry.
  105.  */
  106. static inline void tlbp(void)
  107. {
  108.     __asm__ volatile ("tlbp\n\t");
  109. }
  110.  
  111.  
  112. /** Read Indexed TLB Entry
  113.  *
  114.  * Read Indexed TLB Entry.
  115.  */
  116. static inline void tlbr(void)
  117. {
  118.     __asm__ volatile ("tlbr\n\t");
  119. }
  120.  
  121. /** Write Indexed TLB Entry
  122.  *
  123.  * Write Indexed TLB Entry.
  124.  */
  125. static inline void tlbwi(void)
  126. {
  127.     __asm__ volatile ("tlbwi\n\t");
  128. }
  129.  
  130. /** Write Random TLB Entry
  131.  *
  132.  * Write Random TLB Entry.
  133.  */
  134. static inline void tlbwr(void)
  135. {
  136.     __asm__ volatile ("tlbwr\n\t");
  137. }
  138.  
  139. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  140.  
  141. extern void tlb_invalid(struct exception_regdump *pstate);
  142. extern void tlb_refill(struct exception_regdump *pstate);
  143. extern void tlb_modified(struct exception_regdump *pstate);
  144.  
  145. #endif
  146.