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  1. /*
  2.  * Copyright (c) 2005 Martin Decky
  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 ppc32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ppc32_PAGE_H_
  36. #define KERN_ppc32_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. #ifdef KERNEL
  46.  
  47. #ifndef __ASM__
  48. #   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
  49. #   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
  50. #else
  51. #   define KA2PA(x) ((x) - 0x80000000)
  52. #   define PA2KA(x) ((x) + 0x80000000)
  53. #endif
  54.  
  55. /*
  56.  * Implementation of generic 4-level page table interface,
  57.  * the hardware Page Hash Table is used as cache.
  58.  *
  59.  * Page table layout:
  60.  * - 32-bit virtual addressess
  61.  * - Offset is 12 bits => pages are 4K long
  62.  * - PTL0 has 1024 entries (10 bits)
  63.  * - PTL1 is not used
  64.  * - PTL2 is not used
  65.  * - PLT3 has 1024 entries (10 bits)
  66.  */
  67.  
  68. /* Number of entries in each level. */
  69. #define PTL0_ENTRIES_ARCH   1024
  70. #define PTL1_ENTRIES_ARCH   0
  71. #define PTL2_ENTRIES_ARCH   0
  72. #define PTL3_ENTRIES_ARCH   1024
  73.  
  74. /* Page table sizes for each level. */
  75. #define PTL0_SIZE_ARCH      ONE_FRAME
  76. #define PTL1_SIZE_ARCH      0
  77. #define PTL2_SIZE_ARCH      0
  78. #define PTL3_SIZE_ARCH      ONE_FRAME
  79.  
  80. /* Macros calculating indices into page tables on each level. */
  81. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  82. #define PTL1_INDEX_ARCH(vaddr)  0
  83. #define PTL2_INDEX_ARCH(vaddr)  0
  84. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  85.  
  86. /* Get PTE address accessors for each level. */
  87. #define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
  88.     (((pte_t *) (ptl0))[(i)].pfn << 12)
  89. #define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
  90.     (ptl1)
  91. #define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
  92.     (ptl2)
  93. #define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
  94.     (((pte_t *) (ptl3))[(i)].pfn << 12)
  95.  
  96. /* Set PTE address accessors for each level. */
  97. #define SET_PTL0_ADDRESS_ARCH(ptl0)
  98. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
  99.     (((pte_t *) (ptl0))[(i)].pfn = (a) >> 12)
  100. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  101. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  102. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
  103.     (((pte_t *) (ptl3))[(i)].pfn = (a) >> 12)
  104.  
  105. /* Get PTE flags accessors for each level. */
  106. #define GET_PTL1_FLAGS_ARCH(ptl0, i) \
  107.     get_pt_flags((pte_t *) (ptl0), (index_t) (i))
  108. #define GET_PTL2_FLAGS_ARCH(ptl1, i) \
  109.     PAGE_PRESENT
  110. #define GET_PTL3_FLAGS_ARCH(ptl2, i) \
  111.     PAGE_PRESENT
  112. #define GET_FRAME_FLAGS_ARCH(ptl3, i) \
  113.     get_pt_flags((pte_t *) (ptl3), (index_t) (i))
  114.  
  115. /* Set PTE flags accessors for each level. */
  116. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
  117.     set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
  118. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  119. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  120. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
  121.     set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
  122.  
  123. /* Macros for querying the last-level PTEs. */
  124. #define PTE_VALID_ARCH(pte)         (*((uint32_t *) (pte)) != 0)
  125. #define PTE_PRESENT_ARCH(pte)           ((pte)->p != 0)
  126. #define PTE_GET_FRAME_ARCH(pte)         ((pte)->pfn << 12)
  127. #define PTE_WRITABLE_ARCH(pte)          1
  128. #define PTE_EXECUTABLE_ARCH(pte)        1
  129.  
  130. #ifndef __ASM__
  131.  
  132. #include <mm/mm.h>
  133. #include <arch/interrupt.h>
  134.  
  135. static inline int get_pt_flags(pte_t *pt, index_t i)
  136. {
  137.     pte_t *p = &pt[i];
  138.    
  139.     return ((1 << PAGE_CACHEABLE_SHIFT) |
  140.         ((!p->p) << PAGE_PRESENT_SHIFT) |
  141.         (1 << PAGE_USER_SHIFT) |
  142.         (1 << PAGE_READ_SHIFT) |
  143.         (1 << PAGE_WRITE_SHIFT) |
  144.         (1 << PAGE_EXEC_SHIFT) |
  145.         (p->g << PAGE_GLOBAL_SHIFT));
  146. }
  147.  
  148. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  149. {
  150.     pte_t *p = &pt[i];
  151.    
  152.     p->p = !(flags & PAGE_NOT_PRESENT);
  153.     p->g = (flags & PAGE_GLOBAL) != 0;
  154.     p->valid = 1;
  155. }
  156.  
  157. extern void page_arch_init(void);
  158.  
  159. #endif /* __ASM__ */
  160.  
  161. #endif /* KERNEL */
  162.  
  163. #endif
  164.  
  165. /** @}
  166.  */
  167.