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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. /** @addtogroup mips32mm   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_mips32_TLB_H_
  36. #define KERN_mips32_TLB_H_
  37.  
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <arch/mm/asid.h>
  41. #include <arch/exception.h>
  42.  
  43. #ifdef TLBCNT
  44. #   define TLB_ENTRY_COUNT      TLBCNT
  45. #else
  46. #   define TLB_ENTRY_COUNT      48
  47. #endif
  48.  
  49. #define TLB_WIRED       1
  50. #define TLB_KSTACK_WIRED_INDEX  0
  51.  
  52. #define TLB_PAGE_MASK_16K   (0x3 << 13)
  53.  
  54. #define PAGE_UNCACHED           2
  55. #define PAGE_CACHEABLE_EXC_WRITE    5
  56.  
  57. typedef union {
  58.     struct {
  59. #ifdef BIG_ENDIAN
  60.         unsigned : 2;       /* zero */
  61.         unsigned pfn : 24;  /* frame number */
  62.         unsigned c : 3;     /* cache coherency attribute */
  63.         unsigned d : 1;     /* dirty/write-protect bit */
  64.         unsigned v : 1;     /* valid bit */
  65.         unsigned g : 1;     /* global bit */
  66. #else
  67.         unsigned g : 1;     /* global bit */
  68.         unsigned v : 1;     /* valid bit */
  69.         unsigned d : 1;     /* dirty/write-protect bit */
  70.         unsigned c : 3;     /* cache coherency attribute */
  71.         unsigned pfn : 24;  /* frame number */
  72.         unsigned : 2;       /* zero */
  73. #endif
  74.     } __attribute__ ((packed));
  75.     uint32_t value;
  76. } entry_lo_t;
  77.  
  78. typedef union {
  79.     struct {
  80. #ifdef BIG_ENDIAN
  81.         unsigned vpn2 : 19;
  82.         unsigned : 5;
  83.         unsigned asid : 8;
  84. #else
  85.         unsigned asid : 8;
  86.         unsigned : 5;
  87.         unsigned vpn2 : 19;
  88. #endif
  89.     } __attribute__ ((packed));
  90.     uint32_t value;
  91. } entry_hi_t;
  92.  
  93. typedef union {
  94.     struct {
  95. #ifdef BIG_ENDIAN
  96.         unsigned : 7;
  97.         unsigned mask : 12;
  98.         unsigned : 13;
  99. #else
  100.         unsigned : 13;
  101.         unsigned mask : 12;
  102.         unsigned : 7;
  103. #endif
  104.     } __attribute__ ((packed));
  105.     uint32_t value;
  106. } page_mask_t;
  107.  
  108. typedef union {
  109.     struct {
  110. #ifdef BIG_ENDIAN
  111.         unsigned p : 1;
  112.         unsigned : 27;
  113.         unsigned index : 4;
  114. #else
  115.         unsigned index : 4;
  116.         unsigned : 27;
  117.         unsigned p : 1;
  118. #endif
  119.     } __attribute__ ((packed));
  120.     uint32_t value;
  121. } tlb_index_t;
  122.  
  123. /** Probe TLB for Matching Entry
  124.  *
  125.  * Probe TLB for Matching Entry.
  126.  */
  127. static inline void tlbp(void)
  128. {
  129.     asm volatile ("tlbp\n\t");
  130. }
  131.  
  132.  
  133. /** Read Indexed TLB Entry
  134.  *
  135.  * Read Indexed TLB Entry.
  136.  */
  137. static inline void tlbr(void)
  138. {
  139.     asm volatile ("tlbr\n\t");
  140. }
  141.  
  142. /** Write Indexed TLB Entry
  143.  *
  144.  * Write Indexed TLB Entry.
  145.  */
  146. static inline void tlbwi(void)
  147. {
  148.     asm volatile ("tlbwi\n\t");
  149. }
  150.  
  151. /** Write Random TLB Entry
  152.  *
  153.  * Write Random TLB Entry.
  154.  */
  155. static inline void tlbwr(void)
  156. {
  157.     asm volatile ("tlbwr\n\t");
  158. }
  159.  
  160. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  161.  
  162. extern void tlb_invalid(istate_t *istate);
  163. extern void tlb_refill(istate_t *istate);
  164. extern void tlb_modified(istate_t *istate);
  165. extern void tlb_prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn);
  166. extern void tlb_prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr);
  167.  
  168. #endif
  169.  
  170. /** @}
  171.  */
  172.