#include <sys/mman.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
	void *p = 0x70000000UL;
	size_t l = 0x80001000UL;
	if (mmap(p, l, PROT_READ|PROT_WRITE, MAP_ANONYMOUS | MAP_FIXED | MAP_PRIVATE, -1, 0) == MAP_FAILED) {
		perror("mmap");
		exit(1);
	}
	memset(p, '\0', l);
	return 0;
}