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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. #define PAGE_WIDTH  FRAME_WIDTH
  35. #define PAGE_SIZE   FRAME_SIZE
  36.  
  37. #ifdef KERNEL
  38.  
  39. #ifndef __ASM__
  40. #  include <mm/page.h>
  41. #  include <arch/types.h>
  42. #endif
  43.  
  44. #ifndef __ASM__
  45. # define KA2PA(x)      (((__address) (x)) - 0xffffffff80000000)
  46. # define PA2KA(x)      (((__address) (x)) + 0xffffffff80000000)
  47. #else
  48. # define KA2PA(x)      ((x) - 0xffffffff80000000)
  49. # define PA2KA(x)      ((x) + 0xffffffff80000000)
  50. #endif
  51.  
  52. #define PTL0_ENTRIES_ARCH   512
  53. #define PTL1_ENTRIES_ARCH   512
  54. #define PTL2_ENTRIES_ARCH   512
  55. #define PTL3_ENTRIES_ARCH   512
  56.  
  57. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>39)&0x1ff)
  58. #define PTL1_INDEX_ARCH(vaddr)  (((vaddr)>>30)&0x1ff)
  59. #define PTL2_INDEX_ARCH(vaddr)  (((vaddr)>>21)&0x1ff)
  60. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x1ff)
  61.  
  62. #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 )))
  63. #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 )))
  64. #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 )))
  65. #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 )))
  66.  
  67. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  68. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   set_pt_addr((pte_t *)(ptl0), (index_t)(i), a)
  69. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)       set_pt_addr((pte_t *)(ptl1), (index_t)(i), a)
  70. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)       set_pt_addr((pte_t *)(ptl2), (index_t)(i), a)
  71. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  set_pt_addr((pte_t *)(ptl3), (index_t)(i), a)
  72.  
  73. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  74. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        get_pt_flags((pte_t *)(ptl1), (index_t)(i))
  75. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        get_pt_flags((pte_t *)(ptl2), (index_t)(i))
  76. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  77.  
  78. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  79. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)         set_pt_flags((pte_t *)(ptl1), (index_t)(i), (x))
  80. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)         set_pt_flags((pte_t *)(ptl2), (index_t)(i), (x))
  81. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  82.  
  83. #define PTE_VALID_ARCH(p)           (*((__u64 *) (p)) != 0)
  84. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  85. #define PTE_GET_FRAME_ARCH(p)           ((((__address)(p)->addr_12_31)<<12) | ((__address)(p)->addr_32_51<<32))
  86.  
  87. #ifndef __ASM__
  88.  
  89. /** Page Table Entry. */
  90. struct page_specifier {
  91.     unsigned present : 1;
  92.     unsigned writeable : 1;
  93.     unsigned uaccessible : 1;
  94.     unsigned page_write_through : 1;
  95.     unsigned page_cache_disable : 1;
  96.     unsigned accessed : 1;
  97.     unsigned dirty : 1;
  98.     unsigned unused: 1;
  99.     unsigned global : 1;
  100.     unsigned soft_valid : 1;        /**< Valid content even if present bit is cleared. */
  101.     unsigned avl : 2;
  102.     unsigned addr_12_31 : 30;
  103.     unsigned addr_32_51 : 21;
  104.     unsigned no_execute : 1;
  105. } __attribute__ ((packed));
  106.  
  107. static inline int get_pt_flags(pte_t *pt, index_t i)
  108. {
  109.     pte_t *p = &pt[i];
  110.    
  111.     return (
  112.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  113.         (!p->present)<<PAGE_PRESENT_SHIFT |
  114.         p->uaccessible<<PAGE_USER_SHIFT |
  115.         1<<PAGE_READ_SHIFT |
  116.         p->writeable<<PAGE_WRITE_SHIFT |
  117.         (!p->no_execute)<<PAGE_EXEC_SHIFT |
  118.         p->global<<PAGE_GLOBAL_SHIFT
  119.     );
  120. }
  121.  
  122. static inline void set_pt_addr(pte_t *pt, index_t i, __address a)
  123. {
  124.     pte_t *p = &pt[i];
  125.  
  126.     p->addr_12_31 = (a >> 12) & 0xfffff;
  127.     p->addr_32_51 = a >> 32;
  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->page_cache_disable = !(flags & PAGE_CACHEABLE);
  135.     p->present = !(flags & PAGE_NOT_PRESENT);
  136.     p->uaccessible = (flags & PAGE_USER) != 0;
  137.     p->writeable = (flags & PAGE_WRITE) != 0;
  138.     p->no_execute = (flags & PAGE_EXEC) == 0;
  139.     p->global = (flags & PAGE_GLOBAL) != 0;
  140.    
  141.     /*
  142.      * Ensure that there is at least one bit set even if the present bit is cleared.
  143.      */
  144.     p->soft_valid = 1;
  145. }
  146.  
  147. extern void page_arch_init(void);
  148.  
  149. #endif /* __ASM__ */
  150.  
  151. #endif /* KERNEL */
  152.  
  153. #endif
  154.