Merge branch 'master' into openslxopenslx

1 files changed, 111 insertions, 0 deletions

diff --git a/src/interface/efi/efi_connect.c b/src/interface/efi/efi_connect.c
new file mode 100644
index 000000000..f4747cf6b
--- /dev/null
+++ b/src/interface/efi/efi_connect.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2025 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_SECBOOT ( PERMITTED );
+
+/** @file
+ *
+ * EFI driver connection and disconnection
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <ipxe/efi/efi.h>
+
+/* Disambiguate the various error causes */
+#define EINFO_EEFI_CONNECT						\
+	__einfo_uniqify ( EINFO_EPLATFORM, 0x01,			\
+			  "Could not connect controllers" )
+#define EINFO_EEFI_CONNECT_PROHIBITED					\
+	__einfo_platformify ( EINFO_EEFI_CONNECT,			\
+			      EFI_SECURITY_VIOLATION,			\
+			      "Connecting controllers prohibited by "	\
+			      "security policy" )
+#define EEFI_CONNECT_PROHIBITED						\
+	__einfo_error ( EINFO_EEFI_CONNECT_PROHIBITED )
+#define EEFI_CONNECT( efirc ) EPLATFORM ( EINFO_EEFI_CONNECT, efirc,	\
+					  EEFI_CONNECT_PROHIBITED )
+
+/**
+ * Connect UEFI driver(s)
+ *
+ * @v device		EFI device handle
+ * @v driver		EFI driver handle, or NULL
+ * @ret rc		Return status code
+ */
+int efi_connect ( EFI_HANDLE device, EFI_HANDLE driver ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_HANDLE driverlist[2] = { driver, NULL };
+	EFI_HANDLE *drivers = ( driver ? driverlist : NULL );
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Attempt connection at external TPL */
+	DBGC ( device, "EFI %s connecting ", efi_handle_name ( device ) );
+	DBGC ( device, "%s driver at %s TPL\n",
+	       ( driver ? efi_handle_name ( driver ) : "any" ),
+	       efi_tpl_name ( efi_external_tpl ) );
+	bs->RestoreTPL ( efi_external_tpl );
+	efirc = bs->ConnectController ( device, drivers, NULL, TRUE );
+	bs->RaiseTPL ( efi_internal_tpl );
+	if ( efirc != 0 ) {
+		rc = -EEFI_CONNECT ( efirc );
+		DBGC ( device, "EFI %s could not connect: %s\n",
+		       efi_handle_name ( device ), strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Disconnect UEFI driver(s)
+ *
+ * @v device		EFI device handle
+ * @v driver		EFI driver handle, or NULL
+ * @ret rc		Return status code
+ */
+int efi_disconnect ( EFI_HANDLE device, EFI_HANDLE driver ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Attempt disconnection at external TPL */
+	DBGC ( device, "EFI %s disconnecting ", efi_handle_name ( device ) );
+	DBGC ( device, "%s driver at %s TPL\n",
+	       ( driver ? efi_handle_name ( driver ) : "any" ),
+	       efi_tpl_name ( efi_external_tpl ) );
+	bs->RestoreTPL ( efi_external_tpl );
+	efirc = bs->DisconnectController ( device, driver, NULL );
+	bs->RaiseTPL ( efi_internal_tpl );
+	if ( ( efirc != 0 ) && ( efirc != EFI_NOT_FOUND ) ) {
+		rc = -EEFI ( efirc );
+		DBGC ( device, "EFI %s could not disconnect: %s\n",
+		       efi_handle_name ( device ), strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}