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  1. /*
  2.  * Copyright (c) 2003-2007 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 arm32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_arm32_PAGE_H_
  36. #define KERN_arm32_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. // Using small pages <==> 4kb
  55. #define PTL0_ENTRIES_ARCH   (2<<12) // 4096
  56. #define PTL1_ENTRIES_ARCH   0  
  57. #define PTL2_ENTRIES_ARCH   0  
  58. #define PTL3_ENTRIES_ARCH   (2<<8)  // 256
  59.  
  60. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 20) & 0xfff)
  61. #define PTL1_INDEX_ARCH(vaddr)  0  
  62. #define PTL2_INDEX_ARCH(vaddr)  0  
  63. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x0ff)
  64.  
  65.  
  66. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)(  (((pte_level0_t*)(ptl0))[(i)]) & 0xfffffc00 )
  67. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  68. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  69. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ( (uintptr_t)(((pte_level1_t*)(ptl3))[(i)]) & 0xfffff000 )
  70.  
  71. #define SET_PTL0_ADDRESS_ARCH(ptl0)  // TODO
  72. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10)
  73. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  74. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  75. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12)
  76.  
  77. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i))
  78. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  79. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  80. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i))
  81.  
  82. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x))
  83. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  84. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  85. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_level1_flags((pte_level1t *)(ptl3), (index_t)(i), (x))
  86.  
  87. #define PTE_VALID_ARCH(pte)                  (*((uint32_t *) (pte)) != 0)
  88. #define PTE_PRESENT_ARCH(pte)                  ( ((pte_level0_t *)(pte))->descriptor_type )
  89. #define PTE_GET_FRAME_ARCH(pte)              ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) // pte should point into ptl3
  90. #define PTE_WRITABLE_ARCH(pte)               ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw )  // pte should point into ptl3
  91. #define PTE_EXECUTABLE_ARCH(pte)         1
  92.  
  93. #ifndef __ASM__
  94.  
  95. #include <mm/mm.h>
  96. #include <arch/exception.h>
  97.  
  98. //TODO Comment: Page table structure as in other architectures
  99.  
  100. static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i)
  101. {
  102.   pte_level0_t *p = &pt[i];
  103.  
  104.     return (
  105.         ( p->destriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT |
  106.         ( 1 << PAGE_READ_SHIFT ) |
  107.         ( 1 << PAGE_EXEC_SHIFT ) |
  108.         ( 1 << PAGE_CACHEABLE  )
  109.   // Alf Note: MayBe return WriteAble because level0 should use only kernel which can write
  110.   // Alf Note: MayBe return global flag if index i > 2048 (horni 2GB because kernel is mapped globaly)
  111.     );
  112.  
  113. }
  114. static inline int get_pt_level1_flags(pte_t *pt, index_t i)
  115. {
  116.   pte_level1_t *p = &pt[i];
  117.  
  118.     return (
  119.         ( p->destriptor_type != pte_descriptor_not_preset )    << PAGE_PRESENT_SHIFT |
  120.         ( (p->access_permission_0 == pte_ap_user_ro_kernel_rw) << PAGE_READ_SHIFT )  |
  121.         ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_READ_SHIFT )  |
  122.         ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_WRITE_SHIFT ) |
  123.     ( (p->access_permission_0 != pte_ap_user_no_kernel_rw) << PAGE_USER_SHIFT )  |
  124.         ( 1 << PAGE_EXEC_SHIFT ) |
  125.         ( p->bufferable << PAGE_CACHEABLE  )
  126.   // Alf Note: MayBe return global flag if index i > 2048 (horni 2GB because kernel is mapped globaly)
  127.  
  128.  
  129.     );
  130.  
  131. }
  132.  
  133.  
  134. static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags)
  135. {
  136.     pte_level0_t *p = &pt[i];
  137.    
  138.     if ( flags & PAGE_NOT_PRESENT ) {
  139.       p->destriptor_type = pte_descriptor_not_preset;
  140.       p->should_be_zero  = 1;
  141.     } else
  142.     {
  143.       p->destriptor_type = pte_descriptor_coarse_table;
  144.       p->should_be_zero  = 0;
  145.     }
  146.     return;
  147. }
  148.  
  149. /* We use same acess rights for whole page, so if page is set as not preset then
  150.  * in acess_rigts_3 set value 1
  151.  */  
  152. static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags)
  153. {
  154.     pte_level1_t *p = &pt[i];
  155.    
  156.     if ( flags & PAGE_NOT_PRESENT ) {
  157.       p->destriptor_type      = pte_descriptor_not_preset;
  158.       p->access_permission_3  = 1; // Ensure not all bits set to zero ... correct acess rights are stored in other 0-2 access permission entries
  159.     } else
  160.     {
  161.       p->destriptor_type      = pte_descriptor_coarse_table;
  162.       p->access_permission_3  = p->access_permission_0;
  163.     }
  164.  
  165.   p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0;
  166.   // default kernel rw, user none
  167.   p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw;
  168.   if ( flags & PAGE_USER )  {
  169.       if ( flags & PAGE_READ )
  170.           p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_ro_kernel_rw;
  171.       if ( flags & PAGE_WRITE )
  172.           p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_rw_kernel_rw;
  173.   }
  174.     return; return;
  175. }
  176.  
  177. extern void page_arch_init(void);
  178.  
  179. #endif /* __ASM__ */
  180.  
  181. #endif /* KERNEL */
  182.  
  183. #endif
  184.  
  185. /** @}
  186.  */
  187.  
  188.