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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. #ifndef __ppc32_PAGE_H__
  30. #define __ppc32_PAGE_H__
  31.  
  32. #include <arch/mm/frame.h>
  33.  
  34. #define PAGE_WIDTH  FRAME_WIDTH
  35. #define PAGE_SIZE   FRAME_SIZE
  36.  
  37. #ifdef KERNEL
  38.  
  39. #ifndef __ASM__
  40. #   define KA2PA(x) (((__address) (x)) - 0x80000000)
  41. #   define PA2KA(x) (((__address) (x)) + 0x80000000)
  42. #else
  43. #   define KA2PA(x) ((x) - 0x80000000)
  44. #   define PA2KA(x) ((x) + 0x80000000)
  45. #endif
  46.  
  47. /*
  48.  * Implementation of generic 4-level page table interface,
  49.  * the hardware Page Hash Table is used as cache.
  50.  *
  51.  * Page table layout:
  52.  * - 32-bit virtual addressess
  53.  * - Offset is 12 bits => pages are 4K long
  54.  * - PTL0 has 1024 entries (10 bits)
  55.  * - PTL1 is not used
  56.  * - PTL2 is not used
  57.  * - PLT3 has 1024 entries (10 bits)
  58.  */
  59.  
  60. #define PTL0_ENTRIES_ARCH   1024
  61. #define PTL1_ENTRIES_ARCH   0
  62. #define PTL2_ENTRIES_ARCH   0
  63. #define PTL3_ENTRIES_ARCH   1024
  64.  
  65. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  66. #define PTL1_INDEX_ARCH(vaddr)  0
  67. #define PTL2_INDEX_ARCH(vaddr)  0
  68. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  69.  
  70. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *) (ptl0))[(i)].pfn << 12)
  71. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  72. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  73. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *) (ptl3))[(i)].pfn << 12)
  74.  
  75. #define SET_PTL0_ADDRESS_ARCH(ptl0)
  76. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *) (ptl0))[(i)].pfn = (a) >> 12)
  77. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  78. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  79. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *) (ptl3))[(i)].pfn = (a) >> 12)
  80.  
  81. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *) (ptl0), (index_t) (i))
  82. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  83. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  84. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *) (ptl3), (index_t) (i))
  85.  
  86. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
  87. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  88. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  89. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
  90.  
  91. #define PTE_VALID_ARCH(pte)         (*((__u32 *) (pte)) != 0)
  92. #define PTE_PRESENT_ARCH(pte)       ((pte)->p != 0)
  93. #define PTE_GET_FRAME_ARCH(pte)     ((pte)->pfn << 12)
  94.  
  95. #ifndef __ASM__
  96.  
  97. #include <mm/page.h>
  98. #include <arch/mm/frame.h>
  99. #include <arch/types.h>
  100.  
  101. static inline int get_pt_flags(pte_t *pt, index_t i)
  102. {
  103.     pte_t *p = &pt[i];
  104.    
  105.     return (
  106.         (1 << PAGE_CACHEABLE_SHIFT) |
  107.         ((!p->p) << PAGE_PRESENT_SHIFT) |
  108.         (1 << PAGE_USER_SHIFT) |
  109.         (1 << PAGE_READ_SHIFT) |
  110.         (1 << PAGE_WRITE_SHIFT) |
  111.         (1 << PAGE_EXEC_SHIFT)
  112.     );
  113. }
  114.  
  115. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  116. {
  117.     pte_t *p = &pt[i];
  118.    
  119.     p->p = !(flags & PAGE_NOT_PRESENT);
  120.     p->valid = 1;
  121. }
  122.  
  123. extern void page_arch_init(void);
  124.  
  125. #endif /* __ASM__ */
  126.  
  127. #endif /* KERNEL */
  128.  
  129. #endif
  130.