diff --git a/inc/hf/api.h b/inc/hf/api.h
new file mode 100644
index 0000000..0009ac8
--- /dev/null
+++ b/inc/hf/api.h
@@ -0,0 +1,26 @@
+#ifndef _API_H
+#define _API_H
+
+#include "hf/cpu.h"
+#include "hf/vm.h"
+
+/* TODO: Can we hide these? */
+extern struct vm secondary_vm[MAX_VMS];
+extern uint32_t secondary_vm_count;
+extern struct vm primary_vm;
+
+struct vcpu *api_switch_to_primary(size_t primary_retval,
+				   enum vcpu_state secondary_state);
+
+int32_t api_vm_get_count(void);
+int32_t api_vcpu_get_count(uint32_t vm_idx);
+int32_t api_vcpu_run(uint32_t vm_idx, uint32_t vcpu_idx, struct vcpu **next);
+struct vcpu *api_wait_for_interrupt(void);
+int32_t api_vm_configure(ipaddr_t send, ipaddr_t recv);
+
+int32_t api_rpc_request(uint32_t vm_idx, size_t size);
+int32_t api_rpc_read_request(bool block, struct vcpu **next);
+int32_t api_rpc_reply(size_t size, bool ack, struct vcpu **next);
+int32_t api_rpc_ack(void);
+
+#endif /* _API_H */