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