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 <strings.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
17extern unsigned int __page_size;
18extern unsigned int __page_shift;
19
20static inline unsigned int psize(void)
21{
22	if (!__page_size)
23		__page_size = sysconf(_SC_PAGESIZE);
24	return __page_size;
25}
26
27static inline unsigned int pshift(void)
28{
29	if (!__page_shift)
30		__page_shift = (ffsl(psize()) - 1);
31	return __page_shift;
32}
33
34uint64_t pagemap_get_entry(int fd, char *start);
35bool pagemap_is_softdirty(int fd, char *start);
36bool pagemap_is_swapped(int fd, char *start);
37bool pagemap_is_populated(int fd, char *start);
38unsigned long pagemap_get_pfn(int fd, char *start);
39void clear_softdirty(void);
40bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
41uint64_t read_pmd_pagesize(void);
42bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
43bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
44bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
45int64_t allocate_transhuge(void *ptr, int pagemap_fd);
46unsigned long default_huge_page_size(void);
47int detect_hugetlb_page_sizes(size_t sizes[], int max);
48
49int uffd_register(int uffd, void *addr, uint64_t len,
50		  bool miss, bool wp, bool minor);
51int uffd_unregister(int uffd, void *addr, uint64_t len);
52int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
53			      bool miss, bool wp, bool minor, uint64_t *ioctls);
54unsigned long get_free_hugepages(void);
55
56/*
57 * On ppc64 this will only work with radix 2M hugepage size
58 */
59#define HPAGE_SHIFT 21
60#define HPAGE_SIZE (1 << HPAGE_SHIFT)
61
62#define PAGEMAP_PRESENT(ent)	(((ent) & (1ull << 63)) != 0)
63#define PAGEMAP_PFN(ent)	((ent) & ((1ull << 55) - 1))