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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014 Intel Corporation
* Authors: Tony Luck
*
* This software may be redistributed and/or modified under the terms of
* the GNU General Public License ("GPL") version 2 only as published by the
* Free Software Foundation.
*/
/*
* Given a process if and virtual address, dig around in
* /proc/id/pagemap to find the physical address (if present)
* behind the virtual one.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <sys/mman.h>
static int pagesize=0x1000;
/*
* get information about address from /proc/{pid}/pagemap
*/
unsigned long long vtop(unsigned long long addr, pid_t pid)
{
unsigned long pinfo;
int fd;
char pagemapname[64];
long offset;
offset = addr / pagesize * (sizeof pinfo);
/* sprintf(pagemapname, "/proc/%d/pagemap", getpid()); */
sprintf(pagemapname, "/proc/%d/pagemap", pid);
fd = open(pagemapname, O_RDONLY);
if (fd == -1) {
perror(pagemapname);
exit(1);
}
if (pread(fd, &pinfo, sizeof pinfo, offset) != sizeof pinfo) {
perror(pagemapname);
exit(1);
}
close(fd);
if ((pinfo & (1ull << 63)) == 0) {
printf("page not present\n");
exit(1);
}
return ((pinfo & 0x007fffffffffffffull) * pagesize) + (addr & (pagesize - 1));
}
int main(int argc, char **argv)
{
pid_t process_id;
unsigned long long buf, phys;
if (argc != 3) {
printf("require virtual address and pid: 'vtop vaddress pid'\n");
return 1;
}
pagesize = getpagesize();
buf = strtoul(argv[1], NULL, 16);
process_id = atol(argv[2]);
phys = vtop(buf, process_id);
printf("vtop(%llx,%d) = %llx\n", buf, process_id, phys);
return 0;
}
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