[denali] Get all caps from the init port.

This allows us to remove the bootstrap capabilities for good woo hoo!

lib/mammoth/include/mammoth/init.h

@@ -2,10 +2,6 @@
 
 #include <stdint.h>
 #include <zerrors.h>
-
-extern uint64_t gSelfProcCap;
-extern uint64_t gSelfVmasCap;
-
-extern uint64_t gBootDenaliVmmoCap;
+#include <zglobal.h>
 
 z_err_t ParseInitPort(uint64_t init_port_cap);

lib/mammoth/include/mammoth/port.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <zcall.h>
 #include <zerrors.h>
 
 class Port {
@@ -9,6 +10,15 @@ class Port {
 
   z_err_t PollForIntCap(uint64_t* msg, uint64_t* cap);
 
+  template <typename T>
+  z_err_t WriteMessage(const T& obj, uint64_t cap);
+
  private:
   uint64_t port_cap_;
 };
+
+template <typename T>
+z_err_t Port::WriteMessage(const T& obj, uint64_t cap) {
+  return ZPortSend(port_cap_, sizeof(obj),
+                   reinterpret_cast<const uint8_t*>(&obj), 1, &cap);
+}