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#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
struct pageinfo {
uint64_t pfn : 54;
unsigned int soft_dirty : 1;
unsigned int file_page : 1;
unsigned int swapped : 1;
unsigned int present : 1;
};
void
pagemap_get_entry(struct pageinfo *entry, int fd, uintptr_t vaddr)
{
uint64_t data;
size_t offset;
offset = (vaddr / sysconf(_SC_PAGE_SIZE)) * 8;
if (pread(fd, (void *) &data, 8, offset) != 8)
err(1, "pread");
entry->pfn = data & ((1ULL << 54) - 1);
entry->soft_dirty = (data >> 54) & 1;
entry->file_page = (data >> 61) & 1;
entry->swapped = (data >> 62) & 1;
entry->present = (data >> 63) & 1;
}
int
main(int argc, const char **argv)
{
char filepath[256];
struct pageinfo info;
pid_t pid;
int fd;
pid = getpid();
snprintf(filepath, sizeof(filepath), "/proc/%u/pagemap", pid);
fd = open(filepath, O_RDONLY);
if (!fd) err(1, "open");
pagemap_get_entry(&info, fd, (uintptr_t) main);
printf("PFN: %08lx\n", info.pfn);
close(fd);
}
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