[efi] Use elf2efi utility in place of efilink

elf2efi converts a suitable ELF executable (containing relocation
information, and with appropriate virtual addresses) into an EFI
executable.  It is less tightly coupled with the gPXE build process
and, in particular, does not require the use of a hand-crafted PE
image header in efiprefix.S.

elf2efi correctly handles .bss sections, which significantly reduces
the size of the gPXE EFI executable.

1 files changed, 122 insertions, 0 deletions

diff --git a/src/interface/efi/efi_init.c b/src/interface/efi/efi_init.c
new file mode 100644
index 00000000..6e54cf7e
--- /dev/null
+++ b/src/interface/efi/efi_init.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <gpxe/efi/efi.h>
+#include <gpxe/uuid.h>
+
+/** Image handle passed to entry point */
+EFI_HANDLE efi_image_handle;
+
+/** System table passed to entry point */
+EFI_SYSTEM_TABLE *efi_systab;
+
+/** Declared used EFI protocols */
+static struct efi_protocol efi_protocols[0] \
+	__table_start ( struct efi_protocol, efi_protocols );
+static struct efi_protocol efi_protocols_end[0] \
+	__table_end ( struct efi_protocol, efi_protocols );
+
+/** Declared used EFI configuration tables */
+static struct efi_config_table efi_config_tables[0] \
+	__table_start ( struct efi_config_table, efi_config_tables );
+static struct efi_config_table efi_config_tables_end[0] \
+	__table_end ( struct efi_config_table, efi_config_tables );
+
+/**
+ * Look up EFI configuration table
+ *
+ * @v guid		Configuration table GUID
+ * @ret table		Configuration table, or NULL
+ */
+static void * efi_find_table ( EFI_GUID *guid ) {
+	unsigned int i;
+
+	for ( i = 0 ; i < efi_systab->NumberOfTableEntries ; i++ ) {
+		if ( memcmp ( &efi_systab->ConfigurationTable[i].VendorGuid,
+			      guid, sizeof ( *guid ) ) == 0 )
+			return efi_systab->ConfigurationTable[i].VendorTable;
+	}
+
+	return NULL;
+}
+
+/**
+ * Initialise EFI environment
+ *
+ * @v image_handle	Image handle
+ * @v systab		System table
+ * @ret efirc		EFI return status code
+ */
+EFI_STATUS efi_init ( EFI_HANDLE image_handle,
+		      EFI_SYSTEM_TABLE *systab ) {
+	EFI_BOOT_SERVICES *bs;
+	struct efi_protocol *prot;
+	struct efi_config_table *tab;
+	EFI_STATUS efirc;
+
+	/* Store image handle and system table pointer for future use */
+	efi_image_handle = image_handle;
+	efi_systab = systab;
+
+	/* Sanity checks */
+	if ( ! systab )
+		return EFI_NOT_AVAILABLE_YET;
+	if ( ! systab->ConOut )
+		return EFI_NOT_AVAILABLE_YET;
+	if ( ! systab->BootServices ) {
+		DBGC ( systab, "EFI provided no BootServices entry point\n" );
+		return EFI_NOT_AVAILABLE_YET;
+	}
+	if ( ! systab->RuntimeServices ) {
+		DBGC ( systab, "EFI provided no RuntimeServices entry "
+		       "point\n" );
+		return EFI_NOT_AVAILABLE_YET;
+	}
+	DBGC ( systab, "EFI handle %p systab %p\n", image_handle, systab );
+
+	/* Look up used protocols */
+	bs = systab->BootServices;
+	for ( prot = efi_protocols ; prot < efi_protocols_end ; prot++ ) {
+		if ( ( efirc = bs->LocateProtocol ( &prot->u.guid, NULL,
+						    prot->protocol ) ) == 0 ) {
+			DBGC ( systab, "EFI protocol %s is at %p\n",
+			       uuid_ntoa ( &prot->u.uuid ), *(prot->protocol));
+		} else {
+			DBGC ( systab, "EFI does not provide protocol %s\n",
+			       uuid_ntoa ( &prot->u.uuid ) );
+			/* All protocols are required */
+			return efirc;
+		}
+	}
+
+	/* Look up used configuration tables */
+	for ( tab = efi_config_tables ; tab < efi_config_tables_end ; tab++ ) {
+		if ( ( *(tab->table) = efi_find_table ( &tab->u.guid ) ) ) {
+			DBGC ( systab, "EFI configuration table %s is at %p\n",
+			       uuid_ntoa ( &tab->u.uuid ), *(tab->table) );
+		} else {
+			DBGC ( systab, "EFI does not provide configuration "
+			       "table %s\n", uuid_ntoa ( &tab->u.uuid ) );
+			if ( tab->required )
+				return EFI_NOT_AVAILABLE_YET;
+		}
+	}
+
+	return 0;
+}