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  1. /*
  2.  * Copyright (C) 2001-2004 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 xen32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef __xen32_PAGE_H__
  36. #define __xen32_PAGE_H__
  37.  
  38. #include <arch/mm/frame.h>
  39.  
  40. #define PAGE_WIDTH  FRAME_WIDTH
  41. #define PAGE_SIZE   FRAME_SIZE
  42.  
  43. #ifdef KERNEL
  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. /*
  54.  * Implementation of generic 4-level page table interface.
  55.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  56.  */
  57. #define PTL0_ENTRIES_ARCH   1024
  58. #define PTL1_ENTRIES_ARCH   0
  59. #define PTL2_ENTRIES_ARCH   0
  60. #define PTL3_ENTRIES_ARCH   1024
  61.  
  62. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  63. #define PTL1_INDEX_ARCH(vaddr)  0
  64. #define PTL2_INDEX_ARCH(vaddr)  0
  65. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  66.  
  67. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *) MA2PA((((pte_t *) (ptl0))[(i)].frame_address) << 12))
  68. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  69. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  70. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t) MA2PA((((pte_t *) (ptl3))[(i)].frame_address) << 12))
  71.  
  72. #define SET_PTL0_ADDRESS_ARCH(ptl0) { \
  73.     mmuext_op_t mmu_ext; \
  74.     \
  75.     mmu_ext.cmd = MMUEXT_NEW_BASEPTR; \
  76.     mmu_ext.mfn = ADDR2PFN(PA2MA(ptl0)); \
  77.     xen_mmuext_op(&mmu_ext, 1, NULL, DOMID_SELF); \
  78. }
  79.  
  80. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) { \
  81.     mmu_update_t update; \
  82.     \
  83.     update.ptr = PA2MA(KA2PA(&((pte_t *) (ptl0))[(i)])); \
  84.     update.val = PA2MA(a) | 0x0003; \
  85.     xen_mmu_update(&update, 1, NULL, DOMID_SELF); \
  86. }
  87. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  88. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  89. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *) (ptl3))[(i)].frame_address = PA2MA(a) >> 12)
  90.  
  91. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *) (ptl0), (index_t)(i))
  92. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  93. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  94. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *) (ptl3), (index_t)(i))
  95.  
  96. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *) (ptl0), (index_t)(i), (x))
  97. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  98. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  99. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)        set_pt_flags((pte_t *) (ptl3), (index_t)(i), (x))
  100.  
  101. #define PTE_VALID_ARCH(p)           (*((uint32_t *) (p)) != 0)
  102. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  103. #define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address << FRAME_WIDTH)
  104. #define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
  105. #define PTE_EXECUTABLE_ARCH(p)          1
  106.  
  107. #ifndef __ASM__
  108.  
  109. #include <mm/page.h>
  110. #include <arch/types.h>
  111. #include <arch/mm/frame.h>
  112. #include <typedefs.h>
  113. #include <arch/hypercall.h>
  114.  
  115. /* Page fault error codes. */
  116.  
  117. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  118. #define PFERR_CODE_P        (1 << 0)
  119.  
  120. /** When bit on this position is 1, the page fault was caused by a write. */
  121. #define PFERR_CODE_RW       (1 << 1)
  122.  
  123. /** When bit on this position is 1, the page fault was caused in user mode. */
  124. #define PFERR_CODE_US       (1 << 2)
  125.  
  126. /** When bit on this position is 1, a reserved bit was set in page directory. */
  127. #define PFERR_CODE_RSVD     (1 << 3)
  128.  
  129. /** Page Table Entry. */
  130. struct page_specifier {
  131.     unsigned present : 1;
  132.     unsigned writeable : 1;
  133.     unsigned uaccessible : 1;
  134.     unsigned page_write_through : 1;
  135.     unsigned page_cache_disable : 1;
  136.     unsigned accessed : 1;
  137.     unsigned dirty : 1;
  138.     unsigned pat : 1;
  139.     unsigned global : 1;
  140.     unsigned soft_valid : 1;    /**< Valid content even if the present bit is not set. */
  141.     unsigned avl : 2;
  142.     unsigned frame_address : 20;
  143. } __attribute__ ((packed));
  144.  
  145. typedef struct {
  146.     uint64_t ptr;      /**< Machine address of PTE */
  147.     union {            /**< New contents of PTE */
  148.         uint64_t val;
  149.         pte_t pte;
  150.     };
  151. } mmu_update_t;
  152.  
  153. typedef struct {
  154.     unsigned int cmd;
  155.     union {
  156.         unsigned long mfn;
  157.         unsigned long linear_addr;
  158.     };
  159.     union {
  160.         unsigned int nr_ents;
  161.         void *vcpumask;
  162.     };
  163. } mmuext_op_t;
  164.  
  165. static inline int xen_update_va_mapping(const void *va, const pte_t pte, const unsigned int flags)
  166. {
  167.     return hypercall4(XEN_UPDATE_VA_MAPPING, va, pte, 0, flags);
  168. }
  169.  
  170. static inline int xen_mmu_update(const mmu_update_t *req, const unsigned int count, unsigned int *success_count, domid_t domid)
  171. {
  172.     return hypercall4(XEN_MMU_UPDATE, req, count, success_count, domid);
  173. }
  174.  
  175. static inline int xen_mmuext_op(const mmuext_op_t *op, const unsigned int count, unsigned int *success_count, domid_t domid)
  176. {
  177.     return hypercall4(XEN_MMUEXT_OP, op, count, success_count, domid);
  178. }
  179.  
  180. static inline int get_pt_flags(pte_t *pt, index_t i)
  181. {
  182.     pte_t *p = &pt[i];
  183.    
  184.     return (
  185.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  186.         (!p->present)<<PAGE_PRESENT_SHIFT |
  187.         p->uaccessible<<PAGE_USER_SHIFT |
  188.         1<<PAGE_READ_SHIFT |
  189.         p->writeable<<PAGE_WRITE_SHIFT |
  190.         1<<PAGE_EXEC_SHIFT |
  191.         p->global<<PAGE_GLOBAL_SHIFT
  192.     );
  193. }
  194.  
  195. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  196. {
  197.     pte_t *p = &pt[i];
  198.    
  199.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  200.     p->present = !(flags & PAGE_NOT_PRESENT);
  201.     p->uaccessible = (flags & PAGE_USER) != 0;
  202.     p->writeable = (flags & PAGE_WRITE) != 0;
  203.     p->global = (flags & PAGE_GLOBAL) != 0;
  204.    
  205.     /*
  206.      * Ensure that there is at least one bit set even if the present bit is cleared.
  207.      */
  208.     p->soft_valid = true;
  209. }
  210.  
  211. extern void page_arch_init(void);
  212. extern void page_fault(int n, istate_t *istate);
  213.  
  214. #endif /* __ASM__ */
  215.  
  216. #endif /* KERNEL */
  217.  
  218. #endif
  219.  
  220. /** @}
  221.  */
  222.