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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. #ifdef BIG_ENDIAN
  78.     unsigned a : 1;         /**< Accessed bit. */
  79.     unsigned w : 1;         /**< Page writable bit. */
  80.     unsigned pfn : 24;      /**< Physical frame number. */
  81.     unsigned soft_valid : 1;    /**< Valid content even if not present. */
  82.     unsigned : 1;           /**< Unused. */
  83.     unsigned cacheable : 1;     /**< Cacheable bit. */
  84.     unsigned d : 1;         /**< Dirty bit. */
  85.     unsigned p : 1;         /**< Present bit. */
  86.     unsigned g : 1;         /**< Global bit. */
  87. #else
  88.     unsigned g : 1;         /**< Global bit. */
  89.     unsigned p : 1;         /**< Present bit. */
  90.     unsigned d : 1;         /**< Dirty bit. */
  91.     unsigned cacheable : 1;     /**< Cacheable bit. */
  92.     unsigned : 1;           /**< Unused. */
  93.     unsigned soft_valid : 1;    /**< Valid content even if not present. */
  94.     unsigned pfn : 24;      /**< Physical frame number. */
  95.     unsigned w : 1;         /**< Page writable bit. */
  96.     unsigned a : 1;         /**< Accessed bit. */
  97. #endif
  98. };
  99.  
  100. union entry_hi {
  101.     struct {
  102. #ifdef BIG_ENDIAN
  103.         unsigned vpn2 : 19;
  104.         unsigned : 5;
  105.         unsigned asid : 8;
  106. #else
  107.         unsigned asid : 8;
  108.         unsigned : 5;
  109.         unsigned vpn2 : 19;
  110. #endif
  111.     } __attribute__ ((packed));
  112.     __u32 value;
  113. };
  114.  
  115. union page_mask {
  116.     struct {
  117. #ifdef BIG_ENDIAN
  118.         unsigned : 7;
  119.         unsigned mask : 12;
  120.         unsigned : 13;
  121. #else
  122.         unsigned : 13;
  123.         unsigned mask : 12;
  124.         unsigned : 7;
  125. #endif
  126.     } __attribute__ ((packed));
  127.     __u32 value;
  128. };
  129.  
  130. union index {
  131.     struct {
  132. #ifdef BIG_ENDIAN
  133.         unsigned p : 1;
  134.         unsigned : 27;
  135.         unsigned index : 4;
  136. #else
  137.         unsigned index : 4;
  138.         unsigned : 27;
  139.         unsigned p : 1;
  140. #endif
  141.     } __attribute__ ((packed));
  142.     __u32 value;
  143. };
  144.  
  145. /** Probe TLB for Matching Entry
  146.  *
  147.  * Probe TLB for Matching Entry.
  148.  */
  149. static inline void tlbp(void)
  150. {
  151.     __asm__ volatile ("tlbp\n\t");
  152. }
  153.  
  154.  
  155. /** Read Indexed TLB Entry
  156.  *
  157.  * Read Indexed TLB Entry.
  158.  */
  159. static inline void tlbr(void)
  160. {
  161.     __asm__ volatile ("tlbr\n\t");
  162. }
  163.  
  164. /** Write Indexed TLB Entry
  165.  *
  166.  * Write Indexed TLB Entry.
  167.  */
  168. static inline void tlbwi(void)
  169. {
  170.     __asm__ volatile ("tlbwi\n\t");
  171. }
  172.  
  173. /** Write Random TLB Entry
  174.  *
  175.  * Write Random TLB Entry.
  176.  */
  177. static inline void tlbwr(void)
  178. {
  179.     __asm__ volatile ("tlbwr\n\t");
  180. }
  181.  
  182. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  183.  
  184. extern void tlb_invalid(struct exception_regdump *pstate);
  185. extern void tlb_refill(struct exception_regdump *pstate);
  186. extern void tlb_modified(struct exception_regdump *pstate);
  187.  
  188. #endif
  189.