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userland/posix/virt_to_phys_test.c

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+/* https://github.com/cirosantilli/linux-kernel-module-cheat#userland-physical-address-experiments */
+
+#define _XOPEN_SOURCE 700
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+enum { I0 = 0x12345678 };
+
+static volatile uint32_t i = I0;
+
+int main(void) {
+    printf("vaddr %p\n", (void *)&i);
+    printf("pid %ju\n", (uintmax_t)getpid());
+    while (i == I0) {
+        sleep(1);
+    }
+    printf("i %jx\n", (uintmax_t)i);
+    return EXIT_SUCCESS;
+}