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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_PAGE_H_
  36. #define KERN_mips32_PAGE_H_
  37.  
  38. #include <arch/mm/frame.h>
  39.  
  40. #define PAGE_WIDTH  FRAME_WIDTH
  41. #define PAGE_SIZE   FRAME_SIZE
  42.  
  43. #define PAGE_COLOR_BITS 0           /* dummy */
  44.  
  45. #ifndef __ASM__
  46. #   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
  47. #   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
  48. #else
  49. #   define KA2PA(x) ((x) - 0x80000000)
  50. #   define PA2KA(x) ((x) + 0x80000000)
  51. #endif
  52.  
  53. #ifdef KERNEL
  54.  
  55. /*
  56.  * Implementation of generic 4-level page table interface.
  57.  *
  58.  * Page table layout:
  59.  * - 32-bit virtual addresses
  60.  * - Offset is 14 bits => pages are 16K long
  61.  * - PTE's use similar format as CP0 EntryLo[01] registers => PTE is therefore 4 bytes long
  62.  * - PTE's replace EntryLo v (valid) bit with p (present) bit
  63.  * - PTE's use only one bit to distinguish between cacheable and uncacheable mappings
  64.  * - PTE's define soft_valid field to ensure there is at least one 1 bit even if the p bit is cleared
  65.  * - PTE's make use of CP0 EntryLo's two-bit reserved field for bit W (writable) and bit A (accessed)
  66.  * - PTL0 has 64 entries (6 bits)
  67.  * - PTL1 is not used
  68.  * - PTL2 is not used
  69.  * - PTL3 has 4096 entries (12 bits)
  70.  */
  71.  
  72. #define PTL0_ENTRIES_ARCH   64
  73. #define PTL1_ENTRIES_ARCH   0
  74. #define PTL2_ENTRIES_ARCH   0
  75. #define PTL3_ENTRIES_ARCH   4096
  76.  
  77. #define PTL0_INDEX_ARCH(vaddr)  ((vaddr)>>26)
  78. #define PTL1_INDEX_ARCH(vaddr)  0
  79. #define PTL2_INDEX_ARCH(vaddr)  0
  80. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>14) & 0xfff)
  81.  
  82. #define SET_PTL0_ADDRESS_ARCH(ptl0)
  83.  
  84. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *)(ptl0))[(i)].pfn<<12)
  85. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  86. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  87. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *)(ptl3))[(i)].pfn<<12)
  88.  
  89. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].pfn = (a)>>12)
  90. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  91. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  92. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].pfn = (a)>>12)
  93.  
  94. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  95. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  96. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  97. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  98.  
  99. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  100. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  101. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  102. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  103.  
  104. #define PTE_VALID_ARCH(pte)         (*((uint32_t *) (pte)) != 0)
  105. #define PTE_PRESENT_ARCH(pte)           ((pte)->p != 0)
  106. #define PTE_GET_FRAME_ARCH(pte)         ((pte)->pfn<<12)
  107. #define PTE_WRITABLE_ARCH(pte)          ((pte)->w != 0)
  108. #define PTE_EXECUTABLE_ARCH(pte)        1
  109.  
  110. #ifndef __ASM__
  111.  
  112. #include <mm/mm.h>
  113. #include <arch/exception.h>
  114.  
  115. static inline int get_pt_flags(pte_t *pt, index_t i)
  116. {
  117.     pte_t *p = &pt[i];
  118.    
  119.     return (
  120.         (p->cacheable<<PAGE_CACHEABLE_SHIFT) |
  121.         ((!p->p)<<PAGE_PRESENT_SHIFT) |
  122.         (1<<PAGE_USER_SHIFT) |
  123.         (1<<PAGE_READ_SHIFT) |
  124.         ((p->w)<<PAGE_WRITE_SHIFT) |
  125.         (1<<PAGE_EXEC_SHIFT) |
  126.         (p->g<<PAGE_GLOBAL_SHIFT)
  127.     );
  128.        
  129. }
  130.  
  131. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  132. {
  133.     pte_t *p = &pt[i];
  134.    
  135.     p->cacheable = (flags & PAGE_CACHEABLE) != 0;
  136.     p->p = !(flags & PAGE_NOT_PRESENT);
  137.     p->g = (flags & PAGE_GLOBAL) != 0;
  138.     p->w = (flags & PAGE_WRITE) != 0;
  139.    
  140.     /*
  141.      * Ensure that valid entries have at least one bit set.
  142.      */
  143.     p->soft_valid = 1;
  144. }
  145.  
  146. extern void page_arch_init(void);
  147.  
  148. #endif /* __ASM__ */
  149.  
  150. #endif /* KERNEL */
  151.  
  152. #endif
  153.  
  154. /** @}
  155.  */
  156.