efi_loader: split unrelated code from efi_bootmgr.c
Some code moved from cmd/bootefi.c is actually necessary only for "bootefi
<addr>" command (starting an image manually loaded by a user using U-Boot
load commands or other methods (like JTAG debugger).
The code will never been opted out as unused code by a compiler which
doesn't know how EFI boot manager is implemented. So introduce a new
configuration, CONFIG_EFI_BINARY_EXEC, to enforce them opted out
explicitly.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/lib/efi_loader/efi_bootbin.c b/lib/efi_loader/efi_bootbin.c
new file mode 100644
index 0000000..733cc1a
--- /dev/null
+++ b/lib/efi_loader/efi_bootbin.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * For the code moved from cmd/bootefi.c
+ * Copyright (c) 2016 Alexander Graf
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+
+#include <charset.h>
+#include <efi.h>
+#include <efi_loader.h>
+#include <env.h>
+#include <image.h>
+#include <log.h>
+#include <malloc.h>
+
+static struct efi_device_path *bootefi_image_path;
+static struct efi_device_path *bootefi_device_path;
+static void *image_addr;
+static size_t image_size;
+
+/**
+ * efi_get_image_parameters() - return image parameters
+ *
+ * @img_addr: address of loaded image in memory
+ * @img_size: size of loaded image
+ */
+void efi_get_image_parameters(void **img_addr, size_t *img_size)
+{
+ *img_addr = image_addr;
+ *img_size = image_size;
+}
+
+/**
+ * efi_clear_bootdev() - clear boot device
+ */
+void efi_clear_bootdev(void)
+{
+ efi_free_pool(bootefi_device_path);
+ efi_free_pool(bootefi_image_path);
+ bootefi_device_path = NULL;
+ bootefi_image_path = NULL;
+ image_addr = NULL;
+ image_size = 0;
+}
+
+/**
+ * efi_set_bootdev() - set boot device
+ *
+ * This function is called when a file is loaded, e.g. via the 'load' command.
+ * We use the path to this file to inform the UEFI binary about the boot device.
+ *
+ * @dev: device, e.g. "MMC"
+ * @devnr: number of the device, e.g. "1:2"
+ * @path: path to file loaded
+ * @buffer: buffer with file loaded
+ * @buffer_size: size of file loaded
+ */
+void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
+ void *buffer, size_t buffer_size)
+{
+ struct efi_device_path *device, *image;
+ efi_status_t ret;
+
+ log_debug("dev=%s, devnr=%s, path=%s, buffer=%p, size=%zx\n", dev,
+ devnr, path, buffer, buffer_size);
+
+ /* Forget overwritten image */
+ if (buffer + buffer_size >= image_addr &&
+ image_addr + image_size >= buffer)
+ efi_clear_bootdev();
+
+ /* Remember only PE-COFF and FIT images */
+ if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
+ if (IS_ENABLED(CONFIG_FIT) &&
+ !fit_check_format(buffer, IMAGE_SIZE_INVAL)) {
+ /*
+ * FIT images of type EFI_OS are started via command
+ * bootm. We should not use their boot device with the
+ * bootefi command.
+ */
+ buffer = 0;
+ buffer_size = 0;
+ } else {
+ log_debug("- not remembering image\n");
+ return;
+ }
+ }
+
+ /* efi_set_bootdev() is typically called repeatedly, recover memory */
+ efi_clear_bootdev();
+
+ image_addr = buffer;
+ image_size = buffer_size;
+
+ ret = efi_dp_from_name(dev, devnr, path, &device, &image);
+ if (ret == EFI_SUCCESS) {
+ bootefi_device_path = device;
+ if (image) {
+ /* FIXME: image should not contain device */
+ struct efi_device_path *image_tmp = image;
+
+ efi_dp_split_file_path(image, &device, &image);
+ efi_free_pool(image_tmp);
+ }
+ bootefi_image_path = image;
+ log_debug("- boot device %pD\n", device);
+ if (image)
+ log_debug("- image %pD\n", image);
+ } else {
+ log_debug("- efi_dp_from_name() failed, err=%lx\n", ret);
+ efi_clear_bootdev();
+ }
+}
+
+/**
+ * efi_run_image() - run loaded UEFI image
+ *
+ * @source_buffer: memory address of the UEFI image
+ * @source_size: size of the UEFI image
+ * Return: status code
+ */
+efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
+{
+ efi_handle_t mem_handle = NULL, handle;
+ struct efi_device_path *file_path = NULL;
+ struct efi_device_path *msg_path;
+ efi_status_t ret, ret2;
+ u16 *load_options;
+
+ if (!bootefi_device_path || !bootefi_image_path) {
+ log_debug("Not loaded from disk\n");
+ /*
+ * Special case for efi payload not loaded from disk,
+ * such as 'bootefi hello' or for example payload
+ * loaded directly into memory via JTAG, etc:
+ */
+ file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
+ (uintptr_t)source_buffer,
+ source_size);
+ /*
+ * Make sure that device for device_path exist
+ * in load_image(). Otherwise, shell and grub will fail.
+ */
+ ret = efi_install_multiple_protocol_interfaces(&mem_handle,
+ &efi_guid_device_path,
+ file_path, NULL);
+ if (ret != EFI_SUCCESS)
+ goto out;
+ msg_path = file_path;
+ } else {
+ file_path = efi_dp_concat(bootefi_device_path,
+ bootefi_image_path, false);
+ msg_path = bootefi_image_path;
+ log_debug("Loaded from disk\n");
+ }
+
+ log_info("Booting %pD\n", msg_path);
+
+ ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
+ source_size, &handle));
+ if (ret != EFI_SUCCESS) {
+ log_err("Loading image failed\n");
+ goto out;
+ }
+
+ /* Transfer environment variable as load options */
+ ret = efi_env_set_load_options(handle, "bootargs", &load_options);
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ ret = do_bootefi_exec(handle, load_options);
+
+out:
+ ret2 = efi_uninstall_multiple_protocol_interfaces(mem_handle,
+ &efi_guid_device_path,
+ file_path, NULL);
+ efi_free_pool(file_path);
+ return (ret != EFI_SUCCESS) ? ret : ret2;
+}
+
+/**
+ * efi_binary_run() - run loaded UEFI image
+ *
+ * @image: memory address of the UEFI image
+ * @size: size of the UEFI image
+ * @fdt: device-tree
+ *
+ * Execute an EFI binary image loaded at @image.
+ * @size may be zero if the binary is loaded with U-Boot load command.
+ *
+ * Return: status code
+ */
+efi_status_t efi_binary_run(void *image, size_t size, void *fdt)
+{
+ efi_status_t ret;
+
+ /* Initialize EFI drivers */
+ ret = efi_init_obj_list();
+ if (ret != EFI_SUCCESS) {
+ log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
+ ret & ~EFI_ERROR_MASK);
+ return -1;
+ }
+
+ ret = efi_install_fdt(fdt);
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ return efi_run_image(image, size);
+}