[comboot] Add COMBOOT and COM32 support

src/arch/i386/interface/syslinux/comboot_resolv.c

@@ -0,0 +1,58 @@
+#include <errno.h>
+#include <comboot.h>
+#include <gpxe/in.h>
+#include <gpxe/list.h>
+#include <gpxe/process.h>
+#include <gpxe/resolv.h>
+
+static int comboot_resolv_rc;
+static struct in_addr comboot_resolv_addr;
+
+static void comboot_resolv_done ( struct resolv_interface *resolv,
+				  struct sockaddr *sa, int rc ) {
+	struct sockaddr_in *sin;
+
+	resolv_unplug ( resolv );
+
+	if ( rc != 0 ) {
+		comboot_resolv_rc = rc;
+		return;
+	}
+
+	if ( sa->sa_family != AF_INET ) {
+		comboot_resolv_rc = -EAFNOSUPPORT;
+		return;
+	}
+
+	sin = ( ( struct sockaddr_in * ) sa );
+	comboot_resolv_addr = sin->sin_addr;
+
+	comboot_resolv_rc = 0;
+}
+
+static struct resolv_interface_operations comboot_resolv_ops = {
+	.done = comboot_resolv_done,
+};
+
+static struct resolv_interface comboot_resolver = {
+	.intf = {
+		.dest = &null_resolv.intf,
+		.refcnt = NULL,
+	},
+	.op = &comboot_resolv_ops,
+};
+
+int comboot_resolv ( const char *name, struct in_addr *address ) {
+	int rc;
+
+	comboot_resolv_rc = -EINPROGRESS;
+
+	if ( ( rc = resolv ( &comboot_resolver, name, NULL ) ) != 0 )
+		return rc;
+
+	while ( comboot_resolv_rc == -EINPROGRESS )
+		step();
+
+	*address = comboot_resolv_addr;
+	return comboot_resolv_rc;
+}