Started building the kernel memory manager in userspace

sandbox/vm/main.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include "vm.h"
+
+/* amount of memory to allocate for system RAM in megabytes */
+#define SIMULATED_MEMORY_MB 16
+
+#define MEMPTR(offset) ((void *)((uintptr_t)system_memory) + (offset))
+
+int main(int argc, const char **argv)
+{
+	printf("Hello, world!\n");
+
+	void *system_memory = mmap(
+			NULL,
+			SIMULATED_MEMORY_MB * 0x100000,
+			PROT_READ | PROT_WRITE,
+			MAP_PRIVATE | MAP_ANONYMOUS,
+			-1, 0);
+
+	if (system_memory == MAP_FAILED) {
+		perror("mmap");
+		fprintf(stderr, "cannot allocated simulated system RAM buffer\n");
+		return -1;
+	}
+
+	munmap(system_memory, SIMULATED_MEMORY_MB * 0x100000);
+	return 0;
+}