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  1. /*
  2.  * Copyright (C) 2001-2004 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 __mips_PAGE_H__
  30. #define __mips_PAGE_H__
  31.  
  32. #include <arch/mm/tlb.h>
  33. #include <mm/page.h>
  34. #include <arch/mm/frame.h>
  35. #include <arch/types.h>
  36. #include <arch.h>
  37.  
  38. #define PAGE_SIZE   FRAME_SIZE
  39.  
  40. #define KA2PA(x)    ((x) - 0x80000000)
  41. #define PA2KA(x)    ((x) + 0x80000000)
  42.  
  43. /*
  44.  * Implementation of generic 4-level page table interface.
  45.  * NOTE: this implementation is under construction
  46.  *
  47.  * Page table layout:
  48.  * - 32-bit virtual addresses
  49.  * - Offset is 14 bits => pages are 16K long
  50.  * - PTE's use the same format as CP0 EntryLo[01] registers => PTE is therefore 4 bytes long
  51.  * - PTL0 has 64 entries (6 bits)
  52.  * - PTL1 is not used
  53.  * - PTL2 is not used
  54.  * - PTL3 has 4096 entries (12 bits)
  55.  */
  56.  
  57. #define PTL0_INDEX_ARCH(vaddr)  ((vaddr)>>26)
  58. #define PTL1_INDEX_ARCH(vaddr)  0
  59. #define PTL2_INDEX_ARCH(vaddr)  0
  60. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>14)&0xfff)
  61.  
  62. #define GET_PTL0_ADDRESS_ARCH()         (PTL0)
  63. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (PTL0 = (pte_t *)(ptl0))
  64.  
  65. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *)(ptl0))[(i)].pfn<<14)
  66. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  67. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  68. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *)(ptl3))[(i)].pfn<<14)
  69.  
  70. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].pfn = (a)>>14)
  71. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  72. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  73. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].pfn = (a)>>14)
  74.  
  75. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  76. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  77. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  78. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  79.  
  80. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  81. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  82. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  83. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  84.  
  85. static inline int get_pt_flags(pte_t *pt, index_t i)
  86. {
  87.     pte_t *p = &pt[i];
  88.    
  89.     return (
  90.         ((p->c>PAGE_UNCACHED)<<PAGE_CACHEABLE_SHIFT) |
  91.         ((!p->v)<<PAGE_PRESENT_SHIFT) |
  92.         (1<<PAGE_USER_SHIFT) |
  93.         (1<<PAGE_READ_SHIFT) |
  94.         ((p->d)<<PAGE_WRITE_SHIFT) |
  95.         (1<<PAGE_EXEC_SHIFT)
  96.     );
  97.        
  98. }
  99.  
  100. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  101. {
  102.     pte_t *p = &pt[i];
  103.    
  104.     p->c = (flags & PAGE_CACHEABLE) != 0 ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED;
  105.     p->v = !(flags & PAGE_NOT_PRESENT);
  106.     p->d = (flags & PAGE_WRITE) != 0;
  107. }
  108.  
  109. extern void page_arch_init(void);
  110.  
  111. extern pte_t *PTL0;
  112.  
  113. #endif
  114.