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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. #ifdef BIG_ENDIAN
  57.         unsigned : 2;       /* zero */
  58.         unsigned pfn : 24;  /* frame number */
  59.         unsigned c : 3;     /* cache coherency attribute */
  60.         unsigned d : 1;     /* dirty/write-protect bit */
  61.         unsigned v : 1;     /* valid bit */
  62.         unsigned g : 1;     /* global bit */
  63. #else
  64.         unsigned g : 1;     /* global bit */
  65.         unsigned v : 1;     /* valid bit */
  66.         unsigned d : 1;     /* dirty/write-protect bit */
  67.         unsigned c : 3;     /* cache coherency attribute */
  68.         unsigned pfn : 24;  /* frame number */
  69.         unsigned : 2;       /* zero */
  70. #endif
  71.     } __attribute__ ((packed));
  72.     __u32 value;
  73. };
  74.  
  75. /** Page Table Entry. */
  76. struct pte {
  77.     unsigned g : 1;         /**< Global bit. */
  78.     unsigned p : 1;         /**< Present bit. */
  79.     unsigned d : 1;         /**< Dirty bit. */
  80.     unsigned cacheable : 1;     /**< Cacheable bit. */
  81.     unsigned : 1;           /**< Unused. */
  82.     unsigned soft_valid : 1;    /**< Valid content even if not present. */
  83.     unsigned pfn : 24;      /**< Physical frame number. */
  84.     unsigned w : 1;         /**< Page writable bit. */
  85.     unsigned a : 1;         /**< Accessed bit. */
  86. };
  87.  
  88. union entry_hi {
  89.     struct {
  90. #ifdef BIG_ENDIAN
  91.         unsigned vpn2 : 19;
  92.         unsigned : 5;
  93.         unsigned asid : 8;
  94. #else
  95.         unsigned asid : 8;
  96.         unsigned : 5;
  97.         unsigned vpn2 : 19;
  98. #endif
  99.     } __attribute__ ((packed));
  100.     __u32 value;
  101. };
  102.  
  103. union page_mask {
  104.     struct {
  105. #ifdef BIG_ENDIAN
  106.         unsigned : 7;
  107.         unsigned mask : 12;
  108.         unsigned : 13;
  109. #else
  110.         unsigned : 13;
  111.         unsigned mask : 12;
  112.         unsigned : 7;
  113. #endif
  114.     } __attribute__ ((packed));
  115.     __u32 value;
  116. };
  117.  
  118. union index {
  119.     struct {
  120. #ifdef BIG_ENDIAN
  121.         unsigned p : 1;
  122.         unsigned : 27;
  123.         unsigned index : 4;
  124. #else
  125.         unsigned index : 4;
  126.         unsigned : 27;
  127.         unsigned p : 1;
  128. #endif
  129.     } __attribute__ ((packed));
  130.     __u32 value;
  131. };
  132.  
  133. /** Probe TLB for Matching Entry
  134.  *
  135.  * Probe TLB for Matching Entry.
  136.  */
  137. static inline void tlbp(void)
  138. {
  139.     __asm__ volatile ("tlbp\n\t");
  140. }
  141.  
  142.  
  143. /** Read Indexed TLB Entry
  144.  *
  145.  * Read Indexed TLB Entry.
  146.  */
  147. static inline void tlbr(void)
  148. {
  149.     __asm__ volatile ("tlbr\n\t");
  150. }
  151.  
  152. /** Write Indexed TLB Entry
  153.  *
  154.  * Write Indexed TLB Entry.
  155.  */
  156. static inline void tlbwi(void)
  157. {
  158.     __asm__ volatile ("tlbwi\n\t");
  159. }
  160.  
  161. /** Write Random TLB Entry
  162.  *
  163.  * Write Random TLB Entry.
  164.  */
  165. static inline void tlbwr(void)
  166. {
  167.     __asm__ volatile ("tlbwr\n\t");
  168. }
  169.  
  170. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  171.  
  172. extern void tlb_invalid(istate_t *istate);
  173. extern void tlb_refill(istate_t *istate);
  174. extern void tlb_modified(istate_t *istate);
  175.  
  176. #endif
  177.