Use a linker-table based system to automatically mark and start up

permanent processes, rather than requiring each one to have its own
initialisation function.

src/core/main.c

@@ -16,6 +16,7 @@ Literature dealing with the network protocols:
 
 #include <gpxe/heap.h>
 #include <gpxe/init.h>
+#include <gpxe/process.h>
 #include <gpxe/device.h>
 #include <gpxe/shell.h>
 #include <gpxe/shell_banner.h>
@@ -29,8 +30,10 @@ Literature dealing with the network protocols:
  * Call this function only once, before doing (almost) anything else.
  */
 static void startup ( void ) {
-	hide_etherboot();
 	init_heap();
+	init_processes();
+
+	hide_etherboot();
 	call_init_fns();
 	probe_devices();
 }

src/core/process.c

@@ -30,6 +30,12 @@
 /** Process run queue */
 static LIST_HEAD ( run_queue );
 
+/** Registered permanent processes */
+static struct process processes[0]
+	__table_start ( struct process, processes );
+static struct process processes_end[0]
+	__table_end ( struct process, processes );
+
 /**
  * Add process to process list
  *
@@ -72,3 +78,15 @@ void step ( void ) {
 		break;
 	}
 }
+
+/**
+ * Initialise processes
+ *
+ */
+void init_processes ( void ) {
+	struct process *process;
+
+	for ( process = processes ; process < processes_end ; process++ ) {
+		process_add ( process );
+	}
+}