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. */
15 #include <simgrid_config.h>
19 /** @brief How many memory pages are necessary to store size bytes?
21 * @param size Byte size
22 * @return Number of memory pages
24 static inline __attribute__ ((always_inline))
25 size_t mc_page_count(size_t size)
27 size_t page_count = size >> xbt_pagebits;
28 if (size & (xbt_pagesize-1)) {
34 /** @brief Get the virtual memory page number of a given address
36 * @param address Address
37 * @return Virtual memory page number of the given address
39 static inline __attribute__ ((always_inline))
40 size_t mc_page_number(const void* base, const void* address)
42 xbt_assert(address>=base, "The address is not in the range");
43 return ((uintptr_t) address - (uintptr_t) base) >> xbt_pagebits;
46 /** @brief Get the offset of an address within a memory page
48 * @param address Address
49 * @return Offset within the memory page
51 static inline __attribute__ ((always_inline))
52 size_t mc_page_offset(const void* address)
54 return ((uintptr_t) address) & (xbt_pagesize-1);
57 /** @brief Get the virtual address of a virtual memory page
59 * @param base Address of the first page
60 * @param page Index of the page
62 static inline __attribute__ ((always_inline))
63 void* mc_page_from_number(const void* base, size_t page)
65 return (void*) ((char*)base + (page << xbt_pagebits));
68 static inline __attribute__ ((always_inline))
69 bool mc_same_page(const void* a, const void* b)
71 return ((uintptr_t) a >> xbt_pagebits) == ((uintptr_t) b >> xbt_pagebits);