Subversion Repositories HelenOS

Rev

Rev 2089 | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  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. /** @addtogroup amd64mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. /** Paging on AMD64
  36.  *
  37.  * The space is divided in positive numbers - userspace and
  38.  * negative numbers - kernel space. The 'negative' space starting
  39.  * with 0xffff800000000000 and ending with 0xffffffff80000000
  40.  * (-2GB) is identically mapped physical memory. The area
  41.  * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
  42.  * mapped first 2GB.
  43.  *
  44.  * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
  45.  */
  46.  
  47. #ifndef KERN_amd64_PAGE_H_
  48. #define KERN_amd64_PAGE_H_
  49.  
  50. #include <arch/mm/frame.h>
  51.  
  52. #define PAGE_WIDTH  FRAME_WIDTH
  53. #define PAGE_SIZE   FRAME_SIZE
  54.  
  55. #define PAGE_COLOR_BITS 0           /* dummy */
  56.  
  57. #ifdef KERNEL
  58.  
  59. #ifndef __ASM__
  60. #   include <mm/mm.h>
  61. #   include <arch/types.h>
  62. #   include <arch/interrupt.h>
  63.  
  64. static inline uintptr_t ka2pa(uintptr_t x)
  65. {
  66.     if (x > 0xffffffff80000000)
  67.         return x - 0xffffffff80000000;
  68.     else
  69.         return x - 0xffff800000000000;
  70. }
  71.  
  72. #   define KA2PA(x)      ka2pa((uintptr_t)x)
  73. #   define PA2KA_CODE(x)      (((uintptr_t) (x)) + 0xffffffff80000000)
  74. #   define PA2KA(x)      (((uintptr_t) (x)) + 0xffff800000000000)
  75. #else
  76. #   define KA2PA(x)      ((x) - 0xffffffff80000000)
  77. #   define PA2KA(x)      ((x) + 0xffffffff80000000)
  78. #endif
  79.  
  80. #define PTL0_ENTRIES_ARCH   512
  81. #define PTL1_ENTRIES_ARCH   512
  82. #define PTL2_ENTRIES_ARCH   512
  83. #define PTL3_ENTRIES_ARCH   512
  84.  
  85. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>39)&0x1ff)
  86. #define PTL1_INDEX_ARCH(vaddr)  (((vaddr)>>30)&0x1ff)
  87. #define PTL2_INDEX_ARCH(vaddr)  (((vaddr)>>21)&0x1ff)
  88. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x1ff)
  89.  
  90. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *) ((((uint64_t) ((pte_t *)(ptl0))[(i)].addr_12_31)<<12) | (((uint64_t) ((pte_t *)(ptl0))[(i)].addr_32_51)<<32 )))
  91. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      ((pte_t *) ((((uint64_t) ((pte_t *)(ptl1))[(i)].addr_12_31)<<12) | (((uint64_t) ((pte_t *)(ptl1))[(i)].addr_32_51)<<32 )))
  92. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      ((pte_t *) ((((uint64_t) ((pte_t *)(ptl2))[(i)].addr_12_31)<<12) | (((uint64_t) ((pte_t *)(ptl2))[(i)].addr_32_51)<<32 )))
  93. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t *) ((((uint64_t) ((pte_t *)(ptl3))[(i)].addr_12_31)<<12) | (((uint64_t) ((pte_t *)(ptl3))[(i)].addr_32_51)<<32 )))
  94.  
  95. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((uintptr_t) (ptl0)))
  96. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   set_pt_addr((pte_t *)(ptl0), (index_t)(i), a)
  97. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)       set_pt_addr((pte_t *)(ptl1), (index_t)(i), a)
  98. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)       set_pt_addr((pte_t *)(ptl2), (index_t)(i), a)
  99. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  set_pt_addr((pte_t *)(ptl3), (index_t)(i), a)
  100.  
  101. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  102. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        get_pt_flags((pte_t *)(ptl1), (index_t)(i))
  103. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        get_pt_flags((pte_t *)(ptl2), (index_t)(i))
  104. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  105.  
  106. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  107. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)         set_pt_flags((pte_t *)(ptl1), (index_t)(i), (x))
  108. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)         set_pt_flags((pte_t *)(ptl2), (index_t)(i), (x))
  109. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  110.  
  111. #define PTE_VALID_ARCH(p)           (*((uint64_t *) (p)) != 0)
  112. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  113. #define PTE_GET_FRAME_ARCH(p)           ((((uintptr_t)(p)->addr_12_31)<<12) | ((uintptr_t)(p)->addr_32_51<<32))
  114. #define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
  115. #define PTE_EXECUTABLE_ARCH(p)          ((p)->no_execute == 0)
  116.  
  117. #ifndef __ASM__
  118.  
  119. /* Page fault error codes. */
  120.  
  121. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  122. #define PFERR_CODE_P            (1<<0)  
  123.  
  124. /** When bit on this position is 1, the page fault was caused by a write. */
  125. #define PFERR_CODE_RW           (1<<1)
  126.  
  127. /** When bit on this position is 1, the page fault was caused in user mode. */
  128. #define PFERR_CODE_US           (1<<2)
  129.  
  130. /** When bit on this position is 1, a reserved bit was set in page directory. */
  131. #define PFERR_CODE_RSVD         (1<<3)
  132.  
  133. /** When bit on this position os 1, the page fault was caused during instruction fecth. */
  134. #define PFERR_CODE_ID       (1<<4)
  135.  
  136. static inline int get_pt_flags(pte_t *pt, index_t i)
  137. {
  138.     pte_t *p = &pt[i];
  139.    
  140.     return (
  141.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  142.         (!p->present)<<PAGE_PRESENT_SHIFT |
  143.         p->uaccessible<<PAGE_USER_SHIFT |
  144.         1<<PAGE_READ_SHIFT |
  145.         p->writeable<<PAGE_WRITE_SHIFT |
  146.         (!p->no_execute)<<PAGE_EXEC_SHIFT |
  147.         p->global<<PAGE_GLOBAL_SHIFT
  148.     );
  149. }
  150.  
  151. static inline void set_pt_addr(pte_t *pt, index_t i, uintptr_t a)
  152. {
  153.     pte_t *p = &pt[i];
  154.  
  155.     p->addr_12_31 = (a >> 12) & 0xfffff;
  156.     p->addr_32_51 = a >> 32;
  157. }
  158.  
  159. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  160. {
  161.     pte_t *p = &pt[i];
  162.    
  163.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  164.     p->present = !(flags & PAGE_NOT_PRESENT);
  165.     p->uaccessible = (flags & PAGE_USER) != 0;
  166.     p->writeable = (flags & PAGE_WRITE) != 0;
  167.     p->no_execute = (flags & PAGE_EXEC) == 0;
  168.     p->global = (flags & PAGE_GLOBAL) != 0;
  169.    
  170.     /*
  171.      * Ensure that there is at least one bit set even if the present bit is cleared.
  172.      */
  173.     p->soft_valid = 1;
  174. }
  175.  
  176. extern void page_arch_init(void);
  177. extern void page_fault(int n, istate_t *istate);
  178.  
  179. #endif /* __ASM__ */
  180.  
  181. #endif /* KERNEL */
  182.  
  183. #endif
  184.  
  185. /** @}
  186.  */
  187.