1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <stdint.h> 3 #include <stdbool.h> 4 #include <sys/mman.h> 5 #include <err.h> 6 #include <string.h> /* ffsl() */ 7 #include <unistd.h> /* _SC_PAGESIZE */ 8 9 #define BIT_ULL(nr) (1ULL << (nr)) 10 #define PM_SOFT_DIRTY BIT_ULL(55) 11 #define PM_MMAP_EXCLUSIVE BIT_ULL(56) 12 #define PM_UFFD_WP BIT_ULL(57) 13 #define PM_FILE BIT_ULL(61) 14 #define PM_SWAP BIT_ULL(62) 15 #define PM_PRESENT BIT_ULL(63) 16 17 extern unsigned int __page_size; 18 extern unsigned int __page_shift; 19 20 static inline unsigned int psize(void) 21 { 22 if (!__page_size) 23 __page_size = sysconf(_SC_PAGESIZE); 24 return __page_size; 25 } 26 27 static inline unsigned int pshift(void) 28 { 29 if (!__page_shift) 30 __page_shift = (ffsl(psize()) - 1); 31 return __page_shift; 32 } 33 34 uint64_t pagemap_get_entry(int fd, char *start); 35 bool pagemap_is_softdirty(int fd, char *start); 36 bool pagemap_is_swapped(int fd, char *start); 37 bool pagemap_is_populated(int fd, char *start); 38 unsigned long pagemap_get_pfn(int fd, char *start); 39 void clear_softdirty(void); 40 bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len); 41 uint64_t read_pmd_pagesize(void); 42 bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size); 43 bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size); 44 bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size); 45 int64_t allocate_transhuge(void *ptr, int pagemap_fd); 46 unsigned long default_huge_page_size(void); 47 int detect_hugetlb_page_sizes(size_t sizes[], int max); 48 49 int uffd_register(int uffd, void *addr, uint64_t len, 50 bool miss, bool wp, bool minor); 51 int uffd_unregister(int uffd, void *addr, uint64_t len); 52 int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len, 53 bool miss, bool wp, bool minor, uint64_t *ioctls); 54 55 /* 56 * On ppc64 this will only work with radix 2M hugepage size 57 */ 58 #define HPAGE_SHIFT 21 59 #define HPAGE_SIZE (1 << HPAGE_SHIFT) 60 61 #define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0) 62 #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1)) 63