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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
- *
- * dtbdump.efi saves the device tree provided as a configuration table
- * to a file.
- */
- #include <common.h>
- #include <efi_api.h>
- #define BUFFER_SIZE 64
- #define ESC 0x17
- #define DEFAULT_FILENAME L"dtb.dtb"
- static struct efi_simple_text_output_protocol *cerr;
- static struct efi_simple_text_output_protocol *cout;
- static struct efi_simple_text_input_protocol *cin;
- static struct efi_boot_services *bs;
- static const efi_guid_t fdt_guid = EFI_FDT_GUID;
- static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
- static const efi_guid_t guid_simple_file_system_protocol =
- EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
- /**
- * input() - read string from console
- *
- * @buffer: input buffer
- * @buffer_size: buffer size
- * Return: status code
- */
- static efi_status_t efi_input(u16 *buffer, efi_uintn_t buffer_size)
- {
- struct efi_input_key key = {0};
- efi_uintn_t index;
- efi_uintn_t pos = 0;
- u16 outbuf[2] = L" ";
- efi_status_t ret;
- /* Drain the console input */
- ret = cin->reset(cin, true);
- for (;;) {
- ret = bs->wait_for_event(1, &cin->wait_for_key, &index);
- if (ret != EFI_SUCCESS)
- continue;
- ret = cin->read_key_stroke(cin, &key);
- if (ret != EFI_SUCCESS)
- continue;
- switch (key.scan_code) {
- case 0x17: /* Escape */
- cout->output_string(cout, L"\nAborted\n");
- return EFI_ABORTED;
- default:
- break;
- }
- switch (key.unicode_char) {
- case 0x08: /* Backspace */
- if (pos) {
- buffer[pos--] = 0;
- cout->output_string(cout, L"\b \b");
- }
- break;
- case 0x0a: /* Linefeed */
- case 0x0d: /* Carriage return */
- return EFI_SUCCESS;
- default:
- break;
- }
- /* Ignore surrogate codes */
- if (key.unicode_char >= 0xD800 && key.unicode_char <= 0xDBFF)
- continue;
- if (key.unicode_char >= 0x20 &&
- pos < buffer_size - 1) {
- *outbuf = key.unicode_char;
- buffer[pos++] = key.unicode_char;
- cout->output_string(cout, outbuf);
- }
- }
- }
- /*
- * Convert FDT value to host endianness.
- *
- * @val FDT value
- * @return converted value
- */
- static u32 f2h(fdt32_t val)
- {
- char *buf = (char *)&val;
- char i;
- /* Swap the bytes */
- i = buf[0]; buf[0] = buf[3]; buf[3] = i;
- i = buf[1]; buf[1] = buf[2]; buf[2] = i;
- return *(u32 *)buf;
- }
- /**
- * get_dtb() - get device tree
- *
- * @systable: system table
- * Return: device tree or NULL
- */
- void *get_dtb(struct efi_system_table *systable)
- {
- void *dtb = NULL;
- efi_uintn_t i;
- for (i = 0; i < systable->nr_tables; ++i) {
- if (!memcmp(&systable->tables[i].guid, &fdt_guid,
- sizeof(efi_guid_t))) {
- dtb = systable->tables[i].table;
- break;
- }
- }
- return dtb;
- }
- /**
- * efi_main() - entry point of the EFI application.
- *
- * @handle: handle of the loaded image
- * @systable: system table
- * @return: status code
- */
- efi_status_t EFIAPI efi_main(efi_handle_t handle,
- struct efi_system_table *systable)
- {
- efi_uintn_t ret;
- u16 filename[BUFFER_SIZE] = {0};
- efi_uintn_t dtb_size;
- struct efi_loaded_image *loaded_image;
- struct efi_simple_file_system_protocol *file_system;
- struct efi_file_handle *root, *file;
- struct fdt_header *dtb;
- cerr = systable->std_err;
- cout = systable->con_out;
- cin = systable->con_in;
- bs = systable->boottime;
- cout->set_attribute(cout, EFI_LIGHTGRAY | EFI_BACKGROUND_BLACK);
- cout->clear_screen(cout);
- cout->set_attribute(cout, EFI_YELLOW | EFI_BACKGROUND_BLACK);
- cout->output_string(cout, L"DTB Dump\n\n");
- cout->set_attribute(cout, EFI_LIGHTGRAY | EFI_BACKGROUND_BLACK);
- dtb = get_dtb(systable);
- if (!dtb) {
- cerr->output_string(cout, L"DTB not found\n");
- return EFI_NOT_FOUND;
- }
- if (f2h(dtb->magic) != FDT_MAGIC) {
- cerr->output_string(cout, L"Wrong device tree magic\n");
- return EFI_NOT_FOUND;
- }
- dtb_size = f2h(dtb->totalsize);
- cout->output_string(cout, L"Filename (" DEFAULT_FILENAME ")?\n");
- ret = efi_input(filename, sizeof(filename));
- if (ret != EFI_SUCCESS)
- return ret;
- if (!*filename)
- memcpy(filename, DEFAULT_FILENAME, sizeof(DEFAULT_FILENAME));
- cout->output_string(cout, L"\n");
- ret = bs->open_protocol(handle, &loaded_image_guid,
- (void **)&loaded_image, NULL, NULL,
- EFI_OPEN_PROTOCOL_GET_PROTOCOL);
- if (ret != EFI_SUCCESS) {
- cerr->output_string(cout,
- L"Loaded image protocol not found\n");
- return ret;
- }
- /* Open the simple file system protocol */
- ret = bs->open_protocol(loaded_image->device_handle,
- &guid_simple_file_system_protocol,
- (void **)&file_system, NULL, NULL,
- EFI_OPEN_PROTOCOL_GET_PROTOCOL);
- if (ret != EFI_SUCCESS) {
- cerr->output_string(
- cout, L"Failed to open simple file system protocol\n");
- return ret;
- }
- /* Open volume */
- ret = file_system->open_volume(file_system, &root);
- if (ret != EFI_SUCCESS) {
- cerr->output_string(cerr, L"Failed to open volume\n");
- return ret;
- }
- /* Create file */
- ret = root->open(root, &file, filename,
- EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
- EFI_FILE_MODE_CREATE, EFI_FILE_ARCHIVE);
- if (ret == EFI_SUCCESS) {
- /* Write file */
- ret = file->write(file, &dtb_size, dtb);
- if (ret != EFI_SUCCESS)
- cerr->output_string(cerr, L"Failed to write file\n");
- file->close(file);
- } else {
- cerr->output_string(cerr, L"Failed to open file\n");
- }
- root->close(root);
- if (ret == EFI_SUCCESS) {
- cout->output_string(cout, filename);
- cout->output_string(cout, L" written\n");
- }
- return ret;
- }
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