[sanboot] Quick and dirty hack to make SAN boot protocols selectable

src/config/defaults/pcbios.h

 #define IMAGE_BZIMAGE		/* Linux bzImage image support */
 #define IMAGE_COMBOOT		/* SYSLINUX COMBOOT image support */
 
+#define	SANBOOT_PROTO_ISCSI	/* iSCSI protocol */
+#define	SANBOOT_PROTO_AOE	/* AoE protocol */
+
 #endif /* CONFIG_DEFAULTS_PCBIOS_H */

src/config/general.h

 #undef	DOWNLOAD_PROTO_SLAM	/* Scalable Local Area Multicast */
 #undef	DOWNLOAD_PROTO_FSP	/* FSP? */
 
+/*
+ * SAN boot protocols
+ *
+ */
+
+//#undef	SANBOOT_PROTO_ISCSI	/* iSCSI protocol */
+//#undef	SANBOOT_PROTO_AOE	/* AoE protocol */
+
 /*
  * Name resolution modules
  *

src/core/config.c

 REQUIRE_OBJECT ( slam );
 #endif
 
+/*
+ * Drag in all requested SAN boot protocols
+ *
+ */
+#ifdef SANBOOT_PROTO_ISCSI
+REQUIRE_OBJECT ( iscsiboot );
+#endif
+#ifdef SANBOOT_PROTO_AOE
+REQUIRE_OBJECT ( aoeboot );
+#endif
+
 /*
  * Drag in all requested resolvers
  *

src/include/gpxe/sanboot.h

+#ifndef _GPXE_SANBOOT_H
+#define _GPXE_SANBOOT_H
+
+#include <gpxe/tables.h>
+
+struct sanboot_protocol {
+	const char *prefix;
+	int ( * boot ) ( const char *root_path );
+};
+
+#define __sanboot_protocol \
+	__table ( struct sanboot_protocol, sanboot_protocols, 01 )
+
+#endif /* _GPXE_SANBOOT_H */

src/include/usr/aoeboot.h

-#ifndef _USR_AOEBOOT_H
-#define _USR_AOEBOOT_H
-
-extern int aoeboot ( const char *root_path );
-
-#endif /* _USR_AOEBOOT_H */

src/include/usr/iscsiboot.h

-#ifndef _USR_ISCSIBOOT_H
-#define _USR_ISCSIBOOT_H
-
-extern int iscsiboot ( const char *root_path );
-
-#endif /* _USR_ISCSIBOOT_H */

src/usr/aoeboot.c

 #include <gpxe/ata.h>
 #include <gpxe/netdevice.h>
 #include <gpxe/settings.h>
+#include <gpxe/sanboot.h>
 #include <gpxe/abft.h>
 #include <int13.h>
-#include <usr/aoeboot.h>
 
 /**
  * Guess boot network device
 	return NULL;
 }
 
-int aoeboot ( const char *root_path ) {
+static int aoeboot ( const char *root_path ) {
 	struct ata_device ata;
 	struct int13_drive drive;
 	int rc;
  error_attach:
 	return rc;
 }
+
+struct sanboot_protocol aoe_sanboot_protocol __sanboot_protocol = {
+	.prefix = "aoe:",
+	.boot = aoeboot,
+};

src/usr/autoboot.c

 #include <gpxe/settings.h>
 #include <gpxe/image.h>
 #include <gpxe/embedded.h>
+#include <gpxe/sanboot.h>
 #include <gpxe/uri.h>
 #include <usr/ifmgmt.h>
 #include <usr/route.h>
 #include <usr/dhcpmgmt.h>
 #include <usr/imgmgmt.h>
-#include <usr/iscsiboot.h>
-#include <usr/aoeboot.h>
 #include <usr/autoboot.h>
 
 /** @file
 /** Shutdown flags for exit */
 int shutdown_exit_flags = 0;
 
+/* SAN boot protocols */
+static struct sanboot_protocol sanboot_protocols[0] \
+	__table_start ( struct sanboot_protocol, sanboot_protocols );
+static struct sanboot_protocol sanboot_protocols_end[0] \
+	__table_end ( struct sanboot_protocol, sanboot_protocols );
+
 /**
  * Identify the boot network device
  *
  * @ret rc		Return status code
  */
 int boot_root_path ( const char *root_path ) {
+	struct sanboot_protocol *sanboot;
 
 	/* Quick hack */
-	if ( strncmp ( root_path, "iscsi:", 6 ) == 0 ) {
-		return iscsiboot ( root_path );
-	} else if ( strncmp ( root_path, "aoe:", 4 ) == 0 ) {
-		return aoeboot ( root_path );
+	for ( sanboot = sanboot_protocols ;
+	      sanboot < sanboot_protocols_end ; sanboot++ ) {
+		if ( strncmp ( root_path, sanboot->prefix,
+			       strlen ( sanboot->prefix ) ) == 0 ) {
+			return sanboot->boot ( root_path );
+		}
 	}
 
 	return -ENOTSUP;

src/usr/iscsiboot.c

 #include <gpxe/netdevice.h>
 #include <gpxe/ibft.h>
 #include <gpxe/init.h>
+#include <gpxe/sanboot.h>
 #include <int13.h>
 #include <usr/autoboot.h>
-#include <usr/iscsiboot.h>
 
 struct setting keep_san_setting __setting = {
 	.name = "keep-san",
 	return NULL;
 }
 
-int iscsiboot ( const char *root_path ) {
+static int iscsiboot ( const char *root_path ) {
 	struct scsi_device *scsi;
 	struct int13_drive *drive;
 	int keep_san;
  err_alloc_scsi:
 	return rc;
 }
+
+struct sanboot_protocol iscsi_sanboot_protocol __sanboot_protocol = {
+	.prefix = "iscsi:",
+	.boot = iscsiboot,
+};