1 /* Copyright (c) 2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
13 extern int xbt_pagesize;
14 extern int xbt_pagebits;
16 /** @brief How many memory pages are necessary to store size bytes?
18 * @param size Byte size
19 * @return Number of memory pages
21 static inline __attribute__ ((always_inline))
22 size_t mc_page_count(size_t size)
24 size_t page_count = size >> xbt_pagebits;
25 if (size & (xbt_pagesize-1)) {
31 /** @brief Get the virtual memory page number of a given address
33 * @param address Address
34 * @return Virtual memory page number of the given address
36 static inline __attribute__ ((always_inline))
37 size_t mc_page_number(void* base, void* address)
39 xbt_assert(address>=base, "The address is not in the range");
40 return ((uintptr_t) address - (uintptr_t) base) >> xbt_pagebits;
43 /** @brief Get the offset of an address within a memory page
45 * @param address Address
46 * @return Offset within the memory page
48 static inline __attribute__ ((always_inline))
49 size_t mc_page_offset(void* address)
51 return ((uintptr_t) address) & (xbt_pagesize-1);
54 /** @brief Get the virtual address of a virtual memory page
56 * @param base Address of the first page
57 * @param page Index of the page
59 static inline __attribute__ ((always_inline))
60 void* mc_page_from_number(void* base, size_t page)
62 return (void*) ((char*)base + (page << xbt_pagebits));
65 static inline __attribute__ ((always_inline))
66 bool mc_same_page(void* a, void* b)
68 return ((uintptr_t) a >> xbt_pagebits) == ((uintptr_t) b >> xbt_pagebits);