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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. #define TLB_ENTRY_COUNT  48
  44.  
  45. #define TLB_WIRED               1
  46. #define TLB_KSTACK_WIRED_INDEX  0
  47.  
  48. #define TLB_PAGE_MASK_4K    (0x000 << 13)
  49. #define TLB_PAGE_MASK_16K   (0x003 << 13)
  50. #define TLB_PAGE_MASK_64K   (0x00f << 13)
  51. #define TLB_PAGE_MASK_256K  (0x03f << 13)
  52. #define TLB_PAGE_MASK_1M    (0x0ff << 13)
  53. #define TLB_PAGE_MASK_4M    (0x3ff << 13)
  54. #define TLB_PAGE_MASK_16M   (0xfff << 13)
  55.  
  56. #define PAGE_UNCACHED             2
  57. #define PAGE_CACHEABLE_EXC_WRITE  5
  58.  
  59. typedef union {
  60.     struct {
  61. #ifdef BIG_ENDIAN
  62.         unsigned : 2;       /* zero */
  63.         unsigned pfn : 24;  /* frame number */
  64.         unsigned c : 3;     /* cache coherency attribute */
  65.         unsigned d : 1;     /* dirty/write-protect bit */
  66.         unsigned v : 1;     /* valid bit */
  67.         unsigned g : 1;     /* global bit */
  68. #else
  69.         unsigned g : 1;     /* global bit */
  70.         unsigned v : 1;     /* valid bit */
  71.         unsigned d : 1;     /* dirty/write-protect bit */
  72.         unsigned c : 3;     /* cache coherency attribute */
  73.         unsigned pfn : 24;  /* frame number */
  74.         unsigned : 2;       /* zero */
  75. #endif
  76.     } __attribute__ ((packed));
  77.     uint32_t value;
  78. } entry_lo_t;
  79.  
  80. typedef union {
  81.     struct {
  82. #ifdef BIG_ENDIAN
  83.         unsigned vpn2 : 19;
  84.         unsigned : 5;
  85.         unsigned asid : 8;
  86. #else
  87.         unsigned asid : 8;
  88.         unsigned : 5;
  89.         unsigned vpn2 : 19;
  90. #endif
  91.     } __attribute__ ((packed));
  92.     uint32_t value;
  93. } entry_hi_t;
  94.  
  95. typedef union {
  96.     struct {
  97. #ifdef BIG_ENDIAN
  98.         unsigned : 7;
  99.         unsigned mask : 12;
  100.         unsigned : 13;
  101. #else
  102.         unsigned : 13;
  103.         unsigned mask : 12;
  104.         unsigned : 7;
  105. #endif
  106.     } __attribute__ ((packed));
  107.     uint32_t value;
  108. } page_mask_t;
  109.  
  110. typedef union {
  111.     struct {
  112. #ifdef BIG_ENDIAN
  113.         unsigned p : 1;
  114.         unsigned : 27;
  115.         unsigned index : 4;
  116. #else
  117.         unsigned index : 4;
  118.         unsigned : 27;
  119.         unsigned p : 1;
  120. #endif
  121.     } __attribute__ ((packed));
  122.     uint32_t value;
  123. } tlb_index_t;
  124.  
  125. /** Probe TLB for Matching Entry
  126.  *
  127.  * Probe TLB for Matching Entry.
  128.  */
  129. static inline void tlbp(void)
  130. {
  131.     asm volatile ("tlbp\n\t");
  132. }
  133.  
  134.  
  135. /** Read Indexed TLB Entry
  136.  *
  137.  * Read Indexed TLB Entry.
  138.  */
  139. static inline void tlbr(void)
  140. {
  141.     asm volatile ("tlbr\n\t");
  142. }
  143.  
  144. /** Write Indexed TLB Entry
  145.  *
  146.  * Write Indexed TLB Entry.
  147.  */
  148. static inline void tlbwi(void)
  149. {
  150.     asm volatile ("tlbwi\n\t");
  151. }
  152.  
  153. /** Write Random TLB Entry
  154.  *
  155.  * Write Random TLB Entry.
  156.  */
  157. static inline void tlbwr(void)
  158. {
  159.     asm volatile ("tlbwr\n\t");
  160. }
  161.  
  162. #define tlb_invalidate(asid)  tlb_invalidate_asid(asid)
  163.  
  164. extern void tlb_invalid(istate_t *istate);
  165. extern void tlb_refill(istate_t *istate);
  166. extern void tlb_modified(istate_t *istate);
  167. extern void tlb_prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn);
  168. extern void tlb_prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr);
  169.  
  170. #endif
  171.  
  172. /** @}
  173.  */
  174.