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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_4K    (0x000 << 13)
  53. #define TLB_PAGE_MASK_16K   (0x003 << 13)
  54. #define TLB_PAGE_MASK_64K   (0x00f << 13)
  55. #define TLB_PAGE_MASK_256K  (0x03f << 13)
  56. #define TLB_PAGE_MASK_1M    (0x0ff << 13)
  57. #define TLB_PAGE_MASK_4M    (0x3ff << 13)
  58. #define TLB_PAGE_MASK_16M   (0xfff << 13)
  59.  
  60. #define PAGE_UNCACHED           2
  61. #define PAGE_CACHEABLE_EXC_WRITE    5
  62.  
  63. typedef union {
  64.     struct {
  65. #ifdef BIG_ENDIAN
  66.         unsigned : 2;       /* zero */
  67.         unsigned pfn : 24;  /* frame number */
  68.         unsigned c : 3;     /* cache coherency attribute */
  69.         unsigned d : 1;     /* dirty/write-protect bit */
  70.         unsigned v : 1;     /* valid bit */
  71.         unsigned g : 1;     /* global bit */
  72. #else
  73.         unsigned g : 1;     /* global bit */
  74.         unsigned v : 1;     /* valid bit */
  75.         unsigned d : 1;     /* dirty/write-protect bit */
  76.         unsigned c : 3;     /* cache coherency attribute */
  77.         unsigned pfn : 24;  /* frame number */
  78.         unsigned : 2;       /* zero */
  79. #endif
  80.     } __attribute__ ((packed));
  81.     uint32_t value;
  82. } entry_lo_t;
  83.  
  84. typedef union {
  85.     struct {
  86. #ifdef BIG_ENDIAN
  87.         unsigned vpn2 : 19;
  88.         unsigned : 5;
  89.         unsigned asid : 8;
  90. #else
  91.         unsigned asid : 8;
  92.         unsigned : 5;
  93.         unsigned vpn2 : 19;
  94. #endif
  95.     } __attribute__ ((packed));
  96.     uint32_t value;
  97. } entry_hi_t;
  98.  
  99. typedef union {
  100.     struct {
  101. #ifdef BIG_ENDIAN
  102.         unsigned : 7;
  103.         unsigned mask : 12;
  104.         unsigned : 13;
  105. #else
  106.         unsigned : 13;
  107.         unsigned mask : 12;
  108.         unsigned : 7;
  109. #endif
  110.     } __attribute__ ((packed));
  111.     uint32_t value;
  112. } page_mask_t;
  113.  
  114. typedef union {
  115.     struct {
  116. #ifdef BIG_ENDIAN
  117.         unsigned p : 1;
  118.         unsigned : 27;
  119.         unsigned index : 4;
  120. #else
  121.         unsigned index : 4;
  122.         unsigned : 27;
  123.         unsigned p : 1;
  124. #endif
  125.     } __attribute__ ((packed));
  126.     uint32_t value;
  127. } tlb_index_t;
  128.  
  129. /** Probe TLB for Matching Entry
  130.  *
  131.  * Probe TLB for Matching Entry.
  132.  */
  133. static inline void tlbp(void)
  134. {
  135.     asm volatile ("tlbp\n\t");
  136. }
  137.  
  138.  
  139. /** Read Indexed TLB Entry
  140.  *
  141.  * Read Indexed TLB Entry.
  142.  */
  143. static inline void tlbr(void)
  144. {
  145.     asm volatile ("tlbr\n\t");
  146. }
  147.  
  148. /** Write Indexed TLB Entry
  149.  *
  150.  * Write Indexed TLB Entry.
  151.  */
  152. static inline void tlbwi(void)
  153. {
  154.     asm volatile ("tlbwi\n\t");
  155. }
  156.  
  157. /** Write Random TLB Entry
  158.  *
  159.  * Write Random TLB Entry.
  160.  */
  161. static inline void tlbwr(void)
  162. {
  163.     asm volatile ("tlbwr\n\t");
  164. }
  165.  
  166. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  167.  
  168. extern void tlb_invalid(istate_t *istate);
  169. extern void tlb_refill(istate_t *istate);
  170. extern void tlb_modified(istate_t *istate);
  171. extern void tlb_prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn);
  172. extern void tlb_prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr);
  173.  
  174. #endif
  175.  
  176. /** @}
  177.  */
  178.