[efi] Add EFI image format and basic runtime environment

We have EFI APIs for CPU I/O, PCI I/O, timers, console I/O, user
access and user memory allocation.

EFI executables are created using the vanilla GNU toolchain, with the
EXE header handcrafted in assembly and relocations generated by a
custom efilink utility.

1 files changed, 106 insertions, 0 deletions

diff --git a/src/image/efi_image.c b/src/image/efi_image.c
new file mode 100644
index 000000000..c80cd264f
--- /dev/null
+++ b/src/image/efi_image.c
@@ -0,0 +1,106 @@
+/*
+ * 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 <errno.h>
+#include <gpxe/efi/efi.h>
+#include <gpxe/image.h>
+#include <gpxe/features.h>
+
+FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 );
+
+struct image_type efi_image_type __image_type ( PROBE_NORMAL );
+
+/**
+ * Execute EFI image
+ *
+ * @v image		EFI image
+ * @ret rc		Return status code
+ */
+static int efi_image_exec ( struct image *image ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_HANDLE handle;
+	UINTN exit_data_size;
+	CHAR16 *exit_data;
+	EFI_STATUS efirc;
+
+	/* Attempt loading image */
+	if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
+				       user_to_virt ( image->data, 0 ),
+				       image->len, &handle ) ) != 0 ) {
+		/* Not an EFI image */
+		DBGC ( image, "EFIIMAGE %p could not load: %lx\n",
+		       image, efirc );
+		return -ENOEXEC;
+	}
+
+	/* Start the image */
+	if ( ( efirc = bs->StartImage ( handle, &exit_data_size,
+					&exit_data ) ) != 0 ) {
+		DBGC ( image, "EFIIMAGE %p returned with status %lx\n",
+		       image, efirc );
+		goto done;
+	}
+
+ done:
+	/* Unload the image.  We can't leave it loaded, because we
+	 * have no "unload" operation.
+	 */
+	bs->UnloadImage ( handle );
+
+	return EFIRC_TO_RC ( efirc );
+}
+
+/**
+ * Load EFI image into memory
+ *
+ * @v image		EFI file
+ * @ret rc		Return status code
+ */
+static int efi_image_load ( struct image *image ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_HANDLE handle;
+	EFI_STATUS efirc;
+
+	/* Attempt loading image */
+	if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
+				       user_to_virt ( image->data, 0 ),
+				       image->len, &handle ) ) != 0 ) {
+		/* Not an EFI image */
+		DBGC ( image, "EFIIMAGE %p could not load: %lx\n",
+		       image, efirc );
+		return -ENOEXEC;
+	}
+
+	/* This is an EFI image */
+	if ( ! image->type )
+		image->type = &efi_image_type;
+
+	/* Unload the image.  We can't leave it loaded, because we
+	 * have no "unload" operation.
+	 */
+	bs->UnloadImage ( handle );
+
+	return 0;
+}
+
+/** EFI image type */
+struct image_type efi_image_type __image_type ( PROBE_NORMAL ) = {
+	.name = "EFI",
+	.load = efi_image_load,
+	.exec = efi_image_exec,
+};