[PATCH 1/1] efi_selftest: add tool to download dtb
Heinrich Schuchardt
xypron.glpk at gmx.de
Wed Nov 4 22:33:28 CET 2020
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 at gmx.de>
---
lib/efi_selftest/Makefile | 5 +
lib/efi_selftest/dtbdump.c | 215 +++++++++++++++++++++++++++++++++++++
2 files changed, 220 insertions(+)
create mode 100644 lib/efi_selftest/dtbdump.c
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 06d66cfdd1..aabb743ecb 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -8,6 +8,8 @@
asflags-y += -DHOST_ARCH="$(HOST_ARCH)"
ccflags-y += -DHOST_ARCH="$(HOST_ARCH)"
+CFLAGS_dtbdump_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
+CFLAGS_REMOVE_dtbdump.o := $(CFLAGS_NON_EFI)
CFLAGS_efi_selftest_miniapp_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI)
CFLAGS_efi_selftest_miniapp_return.o := $(CFLAGS_EFI) -Os -ffreestanding
@@ -76,6 +78,9 @@ efi_selftest_miniapp_exception.efi \
efi_selftest_miniapp_exit.efi \
efi_selftest_miniapp_return.efi
+always += \
+dtbdump.efi
+
$(obj)/efi_miniapp_file_image_exception.h: $(obj)/efi_selftest_miniapp_exception.efi
$(obj)/../../tools/file2include $(obj)/efi_selftest_miniapp_exception.efi > \
$(obj)/efi_miniapp_file_image_exception.h
diff --git a/lib/efi_selftest/dtbdump.c b/lib/efi_selftest/dtbdump.c
new file mode 100644
index 0000000000..d90e3eb768
--- /dev/null
+++ b/lib/efi_selftest/dtbdump.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020, Heinrich Schuchardt <xypron.glpk at 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;
+}
--
2.28.0
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