1 files changed, 85 insertions, 0 deletions
diff --git a/src/usr/shimmgmt.c b/src/usr/shimmgmt.c
new file mode 100644
index 000000000..7c064bdcd
--- /dev/null
+++ b/src/usr/shimmgmt.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2023 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <assert.h>
+#include <ipxe/image.h>
+#include <ipxe/efi/efi.h>
+#include <ipxe/efi/efi_shim.h>
+#include <usr/shimmgmt.h>
+
+/** @file
+ *
+ * EFI shim management
+ *
+ */
+
+/**
+ * Set shim image
+ *
+ * @v image		Shim image, or NULL to clear shim
+ * @v altname		Second stage alternative name, or NULL to use default
+ * @ret rc		Return status code
+ */
+int shim ( struct image *image, const char *altname ) {
+	static wchar_t wbootpath[] = EFI_REMOVABLE_MEDIA_FILE_NAME;
+	char bootpath[ sizeof ( wbootpath ) / sizeof ( wbootpath[0] ) ];
+	char *bootname;
+	char *sep;
+	int rc;
+
+	/* Clear any existing shim */
+	image_put ( efi_shim );
+	efi_shim = NULL;
+
+	/* Do nothing more unless a shim is specified */
+	if ( ! image )
+		return 0;
+
+	/* Construct default second stage alternative name */
+	snprintf ( bootpath, sizeof ( bootpath ), "%ls", wbootpath );
+	sep = strrchr ( bootpath, '\\' );
+	assert ( sep != NULL );
+	bootname = ( sep + 1 );
+	assert ( strncasecmp ( bootname, "BOOT", 4 ) == 0 );
+	memcpy ( bootname, "GRUB", 4 );
+
+	/* Use default second stage alternative name, if not specified */
+	if ( ! altname )
+		altname = bootname;
+
+	/* Record second stage alternative name, if any */
+	if ( ( rc = image_set_cmdline ( image, altname ) ) != 0 )
+		return rc;
+
+	/* Record as shim */
+	efi_shim = image_get ( image );
+
+	DBGC ( image, "SHIM %s installed (altname %s)\n",
+	       image->name, image->cmdline );
+	return 0;
+}