/*
* libhugetlbfs - Easy use of Linux hugepages
* Copyright (C) 2009 David Gibson, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <hugetlbfs.h>
#include "hugetests.h"
#define RANDOM_CONSTANT 0x1234ABCD
long page_size, hpage_size;
void do_readback(void *p, size_t size, const char *stage)
{
unsigned int *q = p;
int i;
verbose_printf("do_readback(%p, 0x%lx, \"%s\")\n", p,
(unsigned long)size, stage);
for (i = 0; i < (size / sizeof(*q)); i++) {
q[i] = RANDOM_CONSTANT ^ i;
}
for (i = 0; i < (size / sizeof(*q)); i++) {
if (q[i] != (RANDOM_CONSTANT ^ i))
FAIL("Stage \"%s\": Mismatch at offset 0x%x: 0x%x instead of 0x%x",
stage, i, q[i], RANDOM_CONSTANT ^ i);
}
}
void do_remap(void *target)
{
void *a, *b;
int rc;
a = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (a == MAP_FAILED)
FAIL("mmap(normal page): %s", strerror(errno));
verbose_printf("Normal base mapping at %p\n", a);
do_readback(a, page_size, "base normal");
verbose_printf("Attempting mremap(MAYMOVE|FIXED) to %p...", target);
b = mremap(a, page_size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
target);
if (b != MAP_FAILED) {
verbose_printf("testing...");
do_readback(b, page_size, "remapped");
verbose_printf("ok\n");
} else {
verbose_printf("disallowed (%s)\n", strerror(errno));
b = a;
}
rc = munmap(b, page_size);
if (rc != 0)
FAIL("munmap(after remap): %s", strerror(errno));
}
int main(int argc, char *argv[])
{
int fd, rc;
void *p;
test_init(argc, argv);
hpage_size = check_hugepagesize();
page_size = getpagesize();
fd = hugetlbfs_unlinked_fd();
if (fd < 0)
FAIL("hugetlbfs_unlinked_fd()");
p = mmap(NULL, 3*hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
fd, 0);
if (p == MAP_FAILED)
FAIL("mmap(): %s", strerror(errno));
rc = munmap(p, hpage_size);
if (rc != 0)
FAIL("munmap() low hpage: %s", strerror(errno));
rc = munmap(p + 2*hpage_size, hpage_size);
if (rc != 0)
FAIL("munmap() high hpage: %s", strerror(errno));
p = p + hpage_size;
verbose_printf("Hugepage mapping at %p\n", p);
do_readback(p, hpage_size, "base hugepage");
do_remap(p - page_size);
do_remap(p + hpage_size);
PASS();
}