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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  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 __amd64_PAGE_H__
  30. #define __amd64_PAGE_H__
  31.  
  32. #include <arch/mm/frame.h>
  33.  
  34. #ifndef __ASM__
  35. #  include <mm/page.h>
  36. #  include <arch/types.h>
  37. #endif
  38.  
  39. #define PAGE_WIDTH  FRAME_WIDTH
  40. #define PAGE_SIZE   FRAME_SIZE
  41.  
  42. #ifndef __ASM__
  43. # define KA2PA(x)      (((__address) (x)) - 0xffffffff80000000)
  44. # define PA2KA(x)      (((__address) (x)) + 0xffffffff80000000)
  45. #else
  46. # define KA2PA(x)      ((x) - 0xffffffff80000000)
  47. # define PA2KA(x)      ((x) + 0xffffffff80000000)
  48. #endif
  49.  
  50. #define PTL0_ENTRIES_ARCH   512
  51. #define PTL1_ENTRIES_ARCH   512
  52. #define PTL2_ENTRIES_ARCH   512
  53. #define PTL3_ENTRIES_ARCH   512
  54.  
  55. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>39)&0x1ff)
  56. #define PTL1_INDEX_ARCH(vaddr)  (((vaddr)>>30)&0x1ff)
  57. #define PTL2_INDEX_ARCH(vaddr)  (((vaddr)>>21)&0x1ff)
  58. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x1ff)
  59.  
  60. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *) ((((__u64) ((pte_t *)(ptl0))[(i)].addr_12_31)<<12) | (((__u64) ((pte_t *)(ptl0))[(i)].addr_32_51)<<32 )))
  61. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      ((pte_t *) ((((__u64) ((pte_t *)(ptl1))[(i)].addr_12_31)<<12) | (((__u64) ((pte_t *)(ptl1))[(i)].addr_32_51)<<32 )))
  62. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      ((pte_t *) ((((__u64) ((pte_t *)(ptl2))[(i)].addr_12_31)<<12) | (((__u64) ((pte_t *)(ptl2))[(i)].addr_32_51)<<32 )))
  63. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((__address *) ((((__u64) ((pte_t *)(ptl3))[(i)].addr_12_31)<<12) | (((__u64) ((pte_t *)(ptl3))[(i)].addr_32_51)<<32 )))
  64.  
  65. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  66. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   set_pt_addr((pte_t *)(ptl0), (index_t)(i), a)
  67. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)       set_pt_addr((pte_t *)(ptl1), (index_t)(i), a)
  68. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)       set_pt_addr((pte_t *)(ptl2), (index_t)(i), a)
  69. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  set_pt_addr((pte_t *)(ptl3), (index_t)(i), a)
  70.  
  71. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  72. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        get_pt_flags((pte_t *)(ptl1), (index_t)(i))
  73. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        get_pt_flags((pte_t *)(ptl2), (index_t)(i))
  74. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  75.  
  76. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  77. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)         set_pt_flags((pte_t *)(ptl1), (index_t)(i), (x))
  78. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)         set_pt_flags((pte_t *)(ptl2), (index_t)(i), (x))
  79. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  80.  
  81. #define PTE_VALID_ARCH(p)           (*((__u64 *) (p)) != 0)
  82.  
  83. #ifndef __ASM__
  84.  
  85. /** Page Table Entry. */
  86. struct page_specifier {
  87.     unsigned present : 1;
  88.     unsigned writeable : 1;
  89.     unsigned uaccessible : 1;
  90.     unsigned page_write_through : 1;
  91.     unsigned page_cache_disable : 1;
  92.     unsigned accessed : 1;
  93.     unsigned dirty : 1;
  94.     unsigned unused: 1;
  95.     unsigned global : 1;
  96.     unsigned soft_valid : 1;        /**< Valid content even if present bit is cleared. */
  97.     unsigned avl : 2;
  98.     unsigned addr_12_31 : 30;
  99.     unsigned addr_32_51 : 21;
  100.     unsigned no_execute : 1;
  101. } __attribute__ ((packed));
  102.  
  103. static inline int get_pt_flags(pte_t *pt, index_t i)
  104. {
  105.     pte_t *p = &pt[i];
  106.    
  107.     return (
  108.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  109.         (!p->present)<<PAGE_PRESENT_SHIFT |
  110.         p->uaccessible<<PAGE_USER_SHIFT |
  111.         1<<PAGE_READ_SHIFT |
  112.         p->writeable<<PAGE_WRITE_SHIFT |
  113.         (!p->no_execute)<<PAGE_EXEC_SHIFT |
  114.         p->global<<PAGE_GLOBAL_SHIFT
  115.     );
  116. }
  117.  
  118. static inline void set_pt_addr(pte_t *pt, index_t i, __address a)
  119. {
  120.     pte_t *p = &pt[i];
  121.  
  122.     p->addr_12_31 = (a >> 12) & 0xfffff;
  123.     p->addr_32_51 = a >> 32;
  124. }
  125.  
  126. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  127. {
  128.     pte_t *p = &pt[i];
  129.    
  130.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  131.     p->present = !(flags & PAGE_NOT_PRESENT);
  132.     p->uaccessible = (flags & PAGE_USER) != 0;
  133.     p->writeable = (flags & PAGE_WRITE) != 0;
  134.     p->no_execute = (flags & PAGE_EXEC) == 0;
  135.     p->global = (flags & PAGE_GLOBAL) != 0;
  136.    
  137.     /*
  138.      * Ensure that there is at least one bit set even if the present bit is cleared.
  139.      */
  140.     p->soft_valid = 1;
  141. }
  142.  
  143. extern void page_arch_init(void);
  144.  
  145. #endif
  146.  
  147. #endif
  148.