In order to execute an EFI application, we need to bridge the gap between
U-Boot's notion of executing images and EFI's notion of doing the same.
The best path forward IMHO here is to stick completely to the way U-Boot
deals with payloads. You manually load them using whatever method to RAM
and then have a simple boot command to execute them. So in our case, you
would do
# load mmc 0:1 $loadaddr grub.efi
# bootefi $loadaddr
which then gets you into a grub shell. Fdt information known to U-boot
via the fdt addr command is also passed to the EFI payload.
Signed-off-by: Alexander Graf <ag...@suse.de>
---
common/Makefile | 1 +
common/cmd_bootefi.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 169 insertions(+)
create mode 100644 common/cmd_bootefi.c
diff --git a/common/Makefile b/common/Makefile
index 2a1d9f8..a7a728a 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_CMD_SOURCE) += cmd_source.o
obj-$(CONFIG_CMD_BDI) += cmd_bdinfo.o
obj-$(CONFIG_CMD_BEDBUG) += bedbug.o cmd_bedbug.o
obj-$(CONFIG_CMD_BMP) += cmd_bmp.o
+obj-$(CONFIG_EFI_LOADER) += cmd_bootefi.o
obj-$(CONFIG_CMD_BOOTMENU) += cmd_bootmenu.o
obj-$(CONFIG_CMD_BOOTLDR) += cmd_bootldr.o
obj-$(CONFIG_CMD_BOOTSTAGE) += cmd_bootstage.o
diff --git a/common/cmd_bootefi.c b/common/cmd_bootefi.c
new file mode 100644
index 0000000..8d872d0
--- /dev/null
+++ b/common/cmd_bootefi.c
@@ -0,0 +1,168 @@
+/*
+ * EFI application loader
+ *
+ * Copyright (c) 2015 Alexander Graf
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <efi_loader.h>
+#include <libfdt_env.h>
+
+/* This list contains all the EFI objects our payload has access to */
+LIST_HEAD(efi_obj_list);
+
+/*
+ * When booting using the "bootefi" command, we don't know which
+ * physical device the file came from. So we create a pseudo-device
+ * called "bootefi" with the device path /bootefi.
+ *
+ * In addition to the originating device we also declare the file path
+ * of "bootefi" based loads to be /bootefi.
+ */
+static struct efi_device_path_file_path bootefi_dummy_path[] = {
+ {
+ .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
+ .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
+ .dp.length = sizeof(bootefi_dummy_path[0]),
+ .str = { 'b','o','o','t','e','f','i' },
+ }, {
+ .dp.type = DEVICE_PATH_TYPE_END,
+ .dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
+ .dp.length = sizeof(bootefi_dummy_path[0]),
+ }
+};
+
+static efi_status_t bootefi_open_dp(void *handle, efi_guid_t *protocol,
+ void **protocol_interface, void *agent_handle,
+ void *controller_handle, uint32_t attributes)
+{
+ *protocol_interface = bootefi_dummy_path;
+ return EFI_SUCCESS;
+}
+
+/* The EFI loaded_image interface for the image executed via "bootefi" */
+static struct efi_loaded_image loaded_image_info = {
+ .device_handle = bootefi_dummy_path,
+ .file_path = bootefi_dummy_path,
+};
+
+/* The EFI object struct for the image executed via "bootefi" */
+static struct efi_object loaded_image_info_obj = {
+ .handle = &loaded_image_info,
+ .protocols = {
+ {
+ /* When asking for the loaded_image interface, just
+ * return handle which points to loaded_image_info */
+ .guid = &efi_guid_loaded_image,
+ .open = &efi_return_handle,
+ },
+ {
+ /* When asking for the device path interface, return
+ * bootefi_dummy_path */
+ .guid = &efi_guid_device_path,
+ .open = &bootefi_open_dp,
+ },
+ },
+};
+
+/* The EFI object struct for the device the "bootefi" image was loaded from */
+static struct efi_object bootefi_device_obj = {
+ .handle = bootefi_dummy_path,
+ .protocols = {
+ {
+ /* When asking for the device path interface, return
+ * bootefi_dummy_path */
+ .guid = &efi_guid_device_path,
+ .open = &bootefi_open_dp,
+ }
+ },
+};
+
+/*
+ * Load an EFI payload into a newly allocated piece of memory, register all
+ * EFI objects it would want to access and jump to it.
+ */
+static unsigned long do_bootefi_exec(void *efi)
+{
+ ulong (*entry)(void *image_handle, struct efi_system_table *st);
+
+ /*
+ * gd lives in a fixed register which may get clobbered while we execute
+ * the payload. So save it here and restore it on every callback entry
+ */
+ efi_save_gd();
+
+ /* Update system table to point to our currently loaded FDT */
+ systab.tables[0].table = working_fdt;
+
+ if (!working_fdt) {
+ printf("WARNING: No device tree loaded, expect boot to fail\n");
+ systab.nr_tables = 0;
+ }
+
+ /* Load the EFI payload */
+ entry = efi_load_pe(efi, &loaded_image_info);
+ if (!entry)
+ return -1;
+
+ /* Initialize and populate EFI object list */
+ INIT_LIST_HEAD(&efi_obj_list);
+ list_add_tail(&loaded_image_info_obj.link, &efi_obj_list);
+ list_add_tail(&bootefi_device_obj.link, &efi_obj_list);
+#ifdef CONFIG_PARTITIONS
+ efi_disk_register();
+#endif
+
+ /* Call our payload! */
+#ifdef DEBUG_EFI
+ printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
+#endif
+ return entry(&loaded_image_info, &systab);
+}
+
+
+/* Interpreter command to boot an arbitrary EFI image from memory */
+static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const
argv[])
+{
+ char *saddr;
+ unsigned long addr;
+ int r = 0;
+
+ if (argc < 2)
+ return 1;
+ saddr = argv[1];
+
+ addr = simple_strtoul(saddr, NULL, 16);
+
+ printf("## Starting EFI application at 0x%08lx ...\n", addr);
+ r = do_bootefi_exec((void *)addr);
+ printf("## Application terminated, r = %d\n", r);
+
+ if (r != 0)
+ r = 1;
+
+ return r;
+}
+
+U_BOOT_CMD(
+ bootefi, 2, 0, do_bootefi,
+ "Boot from an EFI image in memory",
+ "<image address>\n"
+);
--
2.1.4
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