[efi] Accept a command line passed to an iPXE image via LoadOptions
Treat a command line passed to iPXE via UEFI LoadOptions as an image
to be registered at startup, as is already done for the .lkrn, .pxe,
and .exe BIOS images.
Originally-implemented-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/include/ipxe/efi/efi_cmdline.h b/src/include/ipxe/efi/efi_cmdline.h
new file mode 100644
index 0000000..45abd54
--- /dev/null
+++ b/src/include/ipxe/efi/efi_cmdline.h
@@ -0,0 +1,18 @@
+#ifndef _IPXE_EFI_CMDLINE_H
+#define _IPXE_EFI_CMDLINE_H
+
+/** @file
+ *
+ * EFI command line
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <wchar.h>
+
+extern const wchar_t *efi_cmdline;
+extern size_t efi_cmdline_len;
+
+#endif /* _IPXE_EFI_CMDLINE_H */
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index c3541e8..7c3b0c4 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -401,6 +401,7 @@
#define ERRFILE_dynkeymap ( ERRFILE_OTHER | 0x00580000 )
#define ERRFILE_pci_cmd ( ERRFILE_OTHER | 0x00590000 )
#define ERRFILE_dhe ( ERRFILE_OTHER | 0x005a0000 )
+#define ERRFILE_efi_cmdline ( ERRFILE_OTHER | 0x005b0000 )
/** @} */
diff --git a/src/interface/efi/efi_cmdline.c b/src/interface/efi/efi_cmdline.c
new file mode 100644
index 0000000..b33bebd
--- /dev/null
+++ b/src/interface/efi/efi_cmdline.c
@@ -0,0 +1,151 @@
+/*
+ * 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 );
+
+/** @file
+ *
+ * EFI command line
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#include <ipxe/init.h>
+#include <ipxe/image.h>
+#include <ipxe/script.h>
+#include <ipxe/efi/efi.h>
+#include <ipxe/efi/efi_cmdline.h>
+
+/** EFI command line (may not be wNUL-terminated */
+const wchar_t *efi_cmdline;
+
+/** Length of EFI command line (in bytes) */
+size_t efi_cmdline_len;
+
+/** Internal copy of the command line */
+static char *efi_cmdline_copy;
+
+/**
+ * Free command line image
+ *
+ * @v refcnt Reference count
+ */
+static void efi_cmdline_free ( struct refcnt *refcnt ) {
+ struct image *image = container_of ( refcnt, struct image, refcnt );
+
+ DBGC ( image, "CMDLINE freeing command line\n" );
+ free ( efi_cmdline_copy );
+}
+
+/** Embedded script representing the command line */
+static struct image efi_cmdline_image = {
+ .refcnt = REF_INIT ( efi_cmdline_free ),
+ .name = "<CMDLINE>",
+ .type = &script_image_type,
+};
+
+/** Colour for debug messages */
+#define colour &efi_cmdline_image
+
+/**
+ * Initialise EFI command line
+ *
+ * @ret rc Return status code
+ */
+static int efi_cmdline_init ( void ) {
+ char *cmdline;
+ size_t len;
+ int rc;
+
+ /* Do nothing if no command line was specified */
+ if ( ! efi_cmdline_len ) {
+ DBGC ( colour, "CMDLINE found no command line\n" );
+ return 0;
+ }
+
+ /* Allocate ASCII copy of command line */
+ len = ( ( efi_cmdline_len / sizeof ( efi_cmdline[0] ) ) + 1 /* NUL */ );
+ efi_cmdline_copy = malloc ( len );
+ if ( ! efi_cmdline_copy ) {
+ rc = -ENOMEM;
+ goto err_alloc;
+ }
+ cmdline = efi_cmdline_copy;
+ snprintf ( cmdline, len, "%ls", efi_cmdline );
+ DBGC ( colour, "CMDLINE found command line \"%s\"\n", cmdline );
+
+ /* Mark command line as consumed */
+ efi_cmdline_len = 0;
+
+ /* Strip image name and surrounding whitespace */
+ while ( isspace ( *cmdline ) )
+ cmdline++;
+ while ( *cmdline && ( ! isspace ( *cmdline ) ) )
+ cmdline++;
+ while ( isspace ( *cmdline ) )
+ cmdline++;
+ DBGC ( colour, "CMDLINE using command line \"%s\"\n", cmdline );
+
+ /* Prepare and register image */
+ efi_cmdline_image.data = virt_to_user ( cmdline );
+ efi_cmdline_image.len = strlen ( cmdline );
+ if ( efi_cmdline_image.len &&
+ ( ( rc = register_image ( &efi_cmdline_image ) ) != 0 ) ) {
+ DBGC ( colour, "CMDLINE could not register command line: %s\n",
+ strerror ( rc ) );
+ goto err_register_image;
+ }
+
+ /* Drop our reference to the image */
+ image_put ( &efi_cmdline_image );
+
+ return 0;
+
+ err_register_image:
+ image_put ( &efi_cmdline_image );
+ err_alloc:
+ return rc;
+}
+
+/**
+ * EFI command line startup function
+ *
+ */
+static void efi_cmdline_startup ( void ) {
+ int rc;
+
+ /* Initialise command line */
+ if ( ( rc = efi_cmdline_init() ) != 0 ) {
+ /* No way to report failure */
+ return;
+ }
+}
+
+/** Command line and initrd initialisation function */
+struct startup_fn efi_cmdline_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
+ .name = "efi_cmdline",
+ .startup = efi_cmdline_startup,
+};
diff --git a/src/interface/efi/efi_init.c b/src/interface/efi/efi_init.c
index 5d98f9f..d3c5042 100644
--- a/src/interface/efi/efi_init.c
+++ b/src/interface/efi/efi_init.c
@@ -27,6 +27,7 @@
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_path.h>
+#include <ipxe/efi/efi_cmdline.h>
#include <ipxe/efi/Protocol/LoadedImage.h>
/** Image handle passed to entry point */
@@ -254,6 +255,10 @@
DBGC ( systab, "EFI image base address %p\n",
efi_loaded_image->ImageBase );
+ /* Record command line */
+ efi_cmdline = efi_loaded_image->LoadOptions;
+ efi_cmdline_len = efi_loaded_image->LoadOptionsSize;
+
/* Get loaded image's device handle's device path */
if ( ( efirc = bs->OpenProtocol ( efi_loaded_image->DeviceHandle,
&efi_device_path_protocol_guid,
