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https://github.com/brain-hackers/u-boot-brain
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efi_selftest: add tool to download dtb
For validating the fixed up device tree we need a tool to need to save it to a file. dtbdump.efi copies the configuration table with the device tree to a file on the same partition from which dtbdump.efi was invoked. The file name can be entered on the console. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
parent
ab02c3fec4
commit
b1aa6fcf27
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@ -8,6 +8,8 @@
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asflags-y += -DHOST_ARCH="$(HOST_ARCH)"
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ccflags-y += -DHOST_ARCH="$(HOST_ARCH)"
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CFLAGS_dtbdump_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
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CFLAGS_REMOVE_dtbdump.o := $(CFLAGS_NON_EFI)
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CFLAGS_efi_selftest_miniapp_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
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CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI)
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CFLAGS_efi_selftest_miniapp_return.o := $(CFLAGS_EFI) -Os -ffreestanding
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@ -76,6 +78,9 @@ efi_selftest_miniapp_exception.efi \
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efi_selftest_miniapp_exit.efi \
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efi_selftest_miniapp_return.efi
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always += \
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dtbdump.efi
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$(obj)/efi_miniapp_file_image_exception.h: $(obj)/efi_selftest_miniapp_exception.efi
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$(obj)/../../tools/file2include $(obj)/efi_selftest_miniapp_exception.efi > \
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$(obj)/efi_miniapp_file_image_exception.h
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215
lib/efi_selftest/dtbdump.c
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215
lib/efi_selftest/dtbdump.c
Normal file
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@ -0,0 +1,215 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* dtbdump.efi saves the device tree provided as a configuration table
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* to a file.
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*/
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#include <common.h>
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#include <efi_api.h>
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#define BUFFER_SIZE 64
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#define ESC 0x17
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#define DEFAULT_FILENAME L"dtb.dtb"
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static struct efi_simple_text_output_protocol *cerr;
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static struct efi_simple_text_output_protocol *cout;
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static struct efi_simple_text_input_protocol *cin;
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static struct efi_boot_services *bs;
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static const efi_guid_t fdt_guid = EFI_FDT_GUID;
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static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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static const efi_guid_t guid_simple_file_system_protocol =
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
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/**
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* input() - read string from console
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*
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* @buffer: input buffer
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* @buffer_size: buffer size
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* Return: status code
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*/
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static efi_status_t efi_input(u16 *buffer, efi_uintn_t buffer_size)
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{
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struct efi_input_key key = {0};
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efi_uintn_t index;
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efi_uintn_t pos = 0;
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u16 outbuf[2] = L" ";
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efi_status_t ret;
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/* Drain the console input */
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ret = cin->reset(cin, true);
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for (;;) {
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ret = bs->wait_for_event(1, &cin->wait_for_key, &index);
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if (ret != EFI_SUCCESS)
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continue;
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ret = cin->read_key_stroke(cin, &key);
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if (ret != EFI_SUCCESS)
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continue;
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switch (key.scan_code) {
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case 0x17: /* Escape */
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cout->output_string(cout, L"\nAborted\n");
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return EFI_ABORTED;
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default:
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break;
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}
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switch (key.unicode_char) {
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case 0x08: /* Backspace */
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if (pos) {
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buffer[pos--] = 0;
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cout->output_string(cout, L"\b \b");
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}
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break;
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case 0x0a: /* Linefeed */
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case 0x0d: /* Carriage return */
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return EFI_SUCCESS;
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default:
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break;
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}
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/* Ignore surrogate codes */
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if (key.unicode_char >= 0xD800 && key.unicode_char <= 0xDBFF)
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continue;
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if (key.unicode_char >= 0x20 &&
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pos < buffer_size - 1) {
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*outbuf = key.unicode_char;
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buffer[pos++] = key.unicode_char;
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cout->output_string(cout, outbuf);
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}
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}
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}
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/*
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* Convert FDT value to host endianness.
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*
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* @val FDT value
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* @return converted value
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*/
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static u32 f2h(fdt32_t val)
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{
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char *buf = (char *)&val;
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char i;
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/* Swap the bytes */
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i = buf[0]; buf[0] = buf[3]; buf[3] = i;
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i = buf[1]; buf[1] = buf[2]; buf[2] = i;
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return *(u32 *)buf;
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}
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/**
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* get_dtb() - get device tree
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*
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* @systable: system table
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* Return: device tree or NULL
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*/
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void *get_dtb(struct efi_system_table *systable)
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{
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void *dtb = NULL;
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efi_uintn_t i;
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for (i = 0; i < systable->nr_tables; ++i) {
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if (!memcmp(&systable->tables[i].guid, &fdt_guid,
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sizeof(efi_guid_t))) {
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dtb = systable->tables[i].table;
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break;
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}
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}
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return dtb;
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}
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/**
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* efi_main() - entry point of the EFI application.
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*
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* @handle: handle of the loaded image
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* @systable: system table
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* @return: status code
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*/
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efi_status_t EFIAPI efi_main(efi_handle_t handle,
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struct efi_system_table *systable)
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{
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efi_uintn_t ret;
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u16 filename[BUFFER_SIZE] = {0};
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efi_uintn_t dtb_size;
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struct efi_loaded_image *loaded_image;
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struct efi_simple_file_system_protocol *file_system;
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struct efi_file_handle *root, *file;
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struct fdt_header *dtb;
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cerr = systable->std_err;
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cout = systable->con_out;
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cin = systable->con_in;
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bs = systable->boottime;
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cout->set_attribute(cout, EFI_LIGHTGRAY | EFI_BACKGROUND_BLACK);
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cout->clear_screen(cout);
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cout->set_attribute(cout, EFI_YELLOW | EFI_BACKGROUND_BLACK);
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cout->output_string(cout, L"DTB Dump\n\n");
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cout->set_attribute(cout, EFI_LIGHTGRAY | EFI_BACKGROUND_BLACK);
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dtb = get_dtb(systable);
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if (!dtb) {
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cerr->output_string(cout, L"DTB not found\n");
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return EFI_NOT_FOUND;
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}
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if (f2h(dtb->magic) != FDT_MAGIC) {
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cerr->output_string(cout, L"Wrong device tree magic\n");
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return EFI_NOT_FOUND;
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}
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dtb_size = f2h(dtb->totalsize);
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cout->output_string(cout, L"Filename (" DEFAULT_FILENAME ")?\n");
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ret = efi_input(filename, sizeof(filename));
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if (ret != EFI_SUCCESS)
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return ret;
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if (!*filename)
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memcpy(filename, DEFAULT_FILENAME, sizeof(DEFAULT_FILENAME));
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cout->output_string(cout, L"\n");
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ret = bs->open_protocol(handle, &loaded_image_guid,
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(void **)&loaded_image, NULL, NULL,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (ret != EFI_SUCCESS) {
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cerr->output_string(cout,
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L"Loaded image protocol not found\n");
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return ret;
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}
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/* Open the simple file system protocol */
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ret = bs->open_protocol(loaded_image->device_handle,
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&guid_simple_file_system_protocol,
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(void **)&file_system, NULL, NULL,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (ret != EFI_SUCCESS) {
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cerr->output_string(
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cout, L"Failed to open simple file system protocol\n");
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return ret;
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}
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/* Open volume */
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ret = file_system->open_volume(file_system, &root);
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if (ret != EFI_SUCCESS) {
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cerr->output_string(cerr, L"Failed to open volume\n");
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return ret;
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}
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/* Create file */
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ret = root->open(root, &file, filename,
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EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
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EFI_FILE_MODE_CREATE, EFI_FILE_ARCHIVE);
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if (ret == EFI_SUCCESS) {
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/* Write file */
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ret = file->write(file, &dtb_size, dtb);
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if (ret != EFI_SUCCESS)
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cerr->output_string(cerr, L"Failed to write file\n");
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file->close(file);
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} else {
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cerr->output_string(cerr, L"Failed to open file\n");
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}
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root->close(root);
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if (ret == EFI_SUCCESS) {
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cout->output_string(cout, filename);
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cout->output_string(cout, L" written\n");
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}
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return ret;
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}
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