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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. /** Paging on AMD64
  30.  *
  31.  * The space is divided in positive numbers - userspace and
  32.  * negative numbers - kernel space. The 'negative' space starting
  33.  * with 0xffff800000000000 and ending with 0xffffffff80000000
  34.  * (-2GB) is identically mapped physical memory. The area
  35.  * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
  36.  * mapped first 2GB.
  37.  *
  38.  * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
  39.  */
  40.  
  41. #ifndef __amd64_PAGE_H__
  42. #define __amd64_PAGE_H__
  43.  
  44. #include <arch/mm/frame.h>
  45.  
  46. #define PAGE_WIDTH  FRAME_WIDTH
  47. #define PAGE_SIZE   FRAME_SIZE
  48.  
  49. #ifdef KERNEL
  50.  
  51. #ifndef __ASM__
  52. #  include <mm/page.h>
  53. #  include <arch/types.h>
  54. #endif
  55.  
  56. #ifndef __ASM__
  57. static inline __address ka2pa(__address x)
  58. {
  59.     if (x > 0xffffffff80000000)
  60.         return x - 0xffffffff80000000;
  61.     else
  62.         return x - 0xffff800000000000;
  63. }
  64. # define KA2PA(x)      ka2pa((__address)x)
  65. # define PA2KA_CODE(x)      (((__address) (x)) + 0xffffffff80000000)
  66. # define PA2KA(x)      (((__address) (x)) + 0xffff800000000000)
  67. #else
  68. # define KA2PA(x)      ((x) - 0xffffffff80000000)
  69. # define PA2KA(x)      ((x) + 0xffffffff80000000)
  70. #endif
  71.  
  72. #define PTL0_ENTRIES_ARCH   512
  73. #define PTL1_ENTRIES_ARCH   512
  74. #define PTL2_ENTRIES_ARCH   512
  75. #define PTL3_ENTRIES_ARCH   512
  76.  
  77. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>39)&0x1ff)
  78. #define PTL1_INDEX_ARCH(vaddr)  (((vaddr)>>30)&0x1ff)
  79. #define PTL2_INDEX_ARCH(vaddr)  (((vaddr)>>21)&0x1ff)
  80. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x1ff)
  81.  
  82. #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 )))
  83. #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 )))
  84. #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 )))
  85. #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 )))
  86.  
  87. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  88. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   set_pt_addr((pte_t *)(ptl0), (index_t)(i), a)
  89. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)       set_pt_addr((pte_t *)(ptl1), (index_t)(i), a)
  90. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)       set_pt_addr((pte_t *)(ptl2), (index_t)(i), a)
  91. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  set_pt_addr((pte_t *)(ptl3), (index_t)(i), a)
  92.  
  93. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  94. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        get_pt_flags((pte_t *)(ptl1), (index_t)(i))
  95. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        get_pt_flags((pte_t *)(ptl2), (index_t)(i))
  96. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  97.  
  98. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  99. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)         set_pt_flags((pte_t *)(ptl1), (index_t)(i), (x))
  100. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)         set_pt_flags((pte_t *)(ptl2), (index_t)(i), (x))
  101. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  102.  
  103. #define PTE_VALID_ARCH(p)           (*((__u64 *) (p)) != 0)
  104. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  105. #define PTE_GET_FRAME_ARCH(p)           ((((__address)(p)->addr_12_31)<<12) | ((__address)(p)->addr_32_51<<32))
  106.  
  107. #ifndef __ASM__
  108.  
  109. /* Page fault error codes. */
  110.  
  111. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  112. #define PFERR_CODE_P            (1<<0)  
  113.  
  114. /** When bit on this position is 1, the page fault was caused by a write. */
  115. #define PFERR_CODE_RW           (1<<1)
  116.  
  117. /** When bit on this position is 1, the page fault was caused in user mode. */
  118. #define PFERR_CODE_US           (1<<2)
  119.  
  120. /** When bit on this position is 1, a reserved bit was set in page directory. */
  121. #define PFERR_CODE_RSVD         (1<<3)
  122.  
  123. /** When bit on this position os 1, the page fault was caused during instruction fecth. */
  124. #define PFERR_CODE_ID       (1<<4)
  125.  
  126. /** Page Table Entry. */
  127. struct page_specifier {
  128.     unsigned present : 1;
  129.     unsigned writeable : 1;
  130.     unsigned uaccessible : 1;
  131.     unsigned page_write_through : 1;
  132.     unsigned page_cache_disable : 1;
  133.     unsigned accessed : 1;
  134.     unsigned dirty : 1;
  135.     unsigned unused: 1;
  136.     unsigned global : 1;
  137.     unsigned soft_valid : 1;        /**< Valid content even if present bit is cleared. */
  138.     unsigned avl : 2;
  139.     unsigned addr_12_31 : 30;
  140.     unsigned addr_32_51 : 21;
  141.     unsigned no_execute : 1;
  142. } __attribute__ ((packed));
  143.  
  144. static inline int get_pt_flags(pte_t *pt, index_t i)
  145. {
  146.     pte_t *p = &pt[i];
  147.    
  148.     return (
  149.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  150.         (!p->present)<<PAGE_PRESENT_SHIFT |
  151.         p->uaccessible<<PAGE_USER_SHIFT |
  152.         1<<PAGE_READ_SHIFT |
  153.         p->writeable<<PAGE_WRITE_SHIFT |
  154.         (!p->no_execute)<<PAGE_EXEC_SHIFT |
  155.         p->global<<PAGE_GLOBAL_SHIFT
  156.     );
  157. }
  158.  
  159. static inline void set_pt_addr(pte_t *pt, index_t i, __address a)
  160. {
  161.     pte_t *p = &pt[i];
  162.  
  163.     p->addr_12_31 = (a >> 12) & 0xfffff;
  164.     p->addr_32_51 = a >> 32;
  165. }
  166.  
  167. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  168. {
  169.     pte_t *p = &pt[i];
  170.    
  171.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  172.     p->present = !(flags & PAGE_NOT_PRESENT);
  173.     p->uaccessible = (flags & PAGE_USER) != 0;
  174.     p->writeable = (flags & PAGE_WRITE) != 0;
  175.     p->no_execute = (flags & PAGE_EXEC) == 0;
  176.     p->global = (flags & PAGE_GLOBAL) != 0;
  177.    
  178.     /*
  179.      * Ensure that there is at least one bit set even if the present bit is cleared.
  180.      */
  181.     p->soft_valid = 1;
  182. }
  183.  
  184. extern void page_arch_init(void);
  185.  
  186. #endif /* __ASM__ */
  187.  
  188. #endif /* KERNEL */
  189.  
  190. #endif
  191.