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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 __ppc32_PAGE_H__
  36. #define __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. #define PTL0_ENTRIES_ARCH   1024
  69. #define PTL1_ENTRIES_ARCH   0
  70. #define PTL2_ENTRIES_ARCH   0
  71. #define PTL3_ENTRIES_ARCH   1024
  72.  
  73. #define PTL0_SIZE_ARCH       ONE_FRAME
  74. #define PTL1_SIZE_ARCH       0
  75. #define PTL2_SIZE_ARCH       0
  76. #define PTL3_SIZE_ARCH       ONE_FRAME
  77.  
  78. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  79. #define PTL1_INDEX_ARCH(vaddr)  0
  80. #define PTL2_INDEX_ARCH(vaddr)  0
  81. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  82.  
  83. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *) (ptl0))[(i)].pfn << 12)
  84. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  85. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  86. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *) (ptl3))[(i)].pfn << 12)
  87.  
  88. #define SET_PTL0_ADDRESS_ARCH(ptl0)
  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)          1
  108. #define PTE_EXECUTABLE_ARCH(pte)        1
  109.  
  110. #ifndef __ASM__
  111.  
  112. #include <mm/mm.h>
  113. #include <arch/interrupt.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.         (1 << PAGE_CACHEABLE_SHIFT) |
  121.         ((!p->p) << PAGE_PRESENT_SHIFT) |
  122.         (1 << PAGE_USER_SHIFT) |
  123.         (1 << PAGE_READ_SHIFT) |
  124.         (1 << PAGE_WRITE_SHIFT) |
  125.         (1 << PAGE_EXEC_SHIFT) |
  126.         (p->g << PAGE_GLOBAL_SHIFT)
  127.     );
  128. }
  129.  
  130. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  131. {
  132.     pte_t *p = &pt[i];
  133.    
  134.     p->p = !(flags & PAGE_NOT_PRESENT);
  135.     p->g = (flags & PAGE_GLOBAL) != 0;
  136.     p->valid = 1;
  137. }
  138.  
  139. extern void page_arch_init(void);
  140.  
  141. #endif /* __ASM__ */
  142.  
  143. #endif /* KERNEL */
  144.  
  145. #endif
  146.  
  147. /** @}
  148.  */
  149.