ed4bb8d982
Move efi_get_distro_fdt_name() into lib/efi so it can be used from the app. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Bootmethod for distro boot via EFI
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*
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* Copyright 2021 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <efi_device_path.h>
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#include <efi_loader.h>
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#include <env.h>
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#include <log.h>
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#include <string.h>
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#include <vsprintf.h>
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/**
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* efi_load_distro_fdt() - load distro device-tree
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*
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* @handle: handle of loaded image
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* @fdt: on return device-tree, must be freed via efi_free_pages()
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* @fdt_size: buffer size
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*/
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void efi_load_distro_fdt(efi_handle_t handle, void **fdt, efi_uintn_t *fdt_size)
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{
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struct efi_device_path *dp;
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efi_status_t ret;
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struct efi_handler *handler;
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struct efi_loaded_image *loaded_image;
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efi_handle_t device;
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*fdt = NULL;
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/* Get boot device from loaded image protocol */
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ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
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if (ret != EFI_SUCCESS)
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return;
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loaded_image = handler->protocol_interface;
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device = loaded_image->device_handle;
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/* Get device path of boot device */
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ret = efi_search_protocol(device, &efi_guid_device_path, &handler);
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if (ret != EFI_SUCCESS)
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return;
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dp = handler->protocol_interface;
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/* Try the various available names */
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for (int seq = 0; ; ++seq) {
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struct efi_device_path *file;
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char buf[255];
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if (efi_get_distro_fdt_name(buf, sizeof(buf), seq))
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break;
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file = efi_dp_from_file(dp, buf);
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if (!file)
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break;
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ret = efi_load_image_from_path(true, file, fdt, fdt_size);
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efi_free_pool(file);
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if (ret == EFI_SUCCESS) {
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log_debug("Fdt %pD loaded\n", file);
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break;
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}
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}
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}
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