eficonfig: menu-driven addition of UEFI boot option

This commit add the "eficonfig" command.
The "eficonfig" command implements the menu-driven UEFI boot option
maintenance feature. This commit implements the addition of
new boot option. User can select the block device volume having
efi_simple_file_system_protocol and select the file corresponding
to the Boot#### variable. User can also enter the description and
optional_data of the BOOT#### variable in utf8.

This commit adds "include/efi_config.h", it contains the common
definition to be used from other menus such as UEFI Secure Boot
key management.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>

cmd/Kconfig

@@ -1928,6 +1928,13 @@ config CMD_EFIDEBUG
 	  particularly for managing boot parameters as  well as examining
 	  various EFI status for debugging.
 
+config CMD_EFICONFIG
+	bool "eficonfig - provide menu-driven uefi variables maintenance interface"
+	depends on CMD_BOOTEFI_BOOTMGR
+	help
+	  Enable the 'eficonfig' command which provides the menu-driven UEFI
+	  variable maintenance interface.
+
 config CMD_EXCEPTION
 	bool "exception - raise exception"
 	depends on ARM || RISCV || SANDBOX || X86

cmd/Makefile

@@ -63,6 +63,7 @@ obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o
 obj-$(CONFIG_CMD_EEPROM) += eeprom.o
 obj-$(CONFIG_EFI) += efi.o
 obj-$(CONFIG_CMD_EFIDEBUG) += efidebug.o
+obj-$(CONFIG_CMD_EFICONFIG) += eficonfig.o
 obj-$(CONFIG_CMD_ELF) += elf.o
 obj-$(CONFIG_CMD_EROFS) += erofs.o
 obj-$(CONFIG_HUSH_PARSER) += exit.o

include/efi_config.h

@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  Menu-driven UEFI Variable maintenance
+ *
+ *  Copyright (c) 2022 Masahisa Kojima, Linaro Limited
+ */
+
+#ifndef _EFI_CONFIG_H
+#define _EFI_CONFIG_H
+
+#include <efi_loader.h>
+
+#define EFICONFIG_ENTRY_NUM_MAX 99
+#define EFICONFIG_FILE_PATH_MAX 512
+#define EFICONFIG_FILE_PATH_BUF_SIZE (EFICONFIG_FILE_PATH_MAX * sizeof(u16))
+
+typedef efi_status_t (*eficonfig_entry_func)(void *data);
+
+/**
+ * struct eficonfig_entry - menu entry structure
+ *
+ * @num:	menu entry index
+ * @title:	title of entry
+ * @key:	unique key
+ * @efi_menu:	pointer to the menu structure
+ * @func:	callback function to be called when this entry is selected
+ * @data:	data to be passed to the callback function, caller must free() this pointer
+ * @list:	list structure
+ */
+struct eficonfig_entry {
+	u32 num;
+	char *title;
+	char key[3];
+	struct efimenu *efi_menu;
+	eficonfig_entry_func func;
+	void *data;
+	struct list_head list;
+};
+
+/**
+ * struct efimenu - efi menu structure
+ *
+ * @delay:		delay for autoboot
+ * @active:		active menu entry index
+ * @count:		total count of menu entry
+ * @menu_header:	menu header string
+ * @list:		menu entry list structure
+ */
+struct efimenu {
+	int delay;
+	int active;
+	int count;
+	char *menu_header;
+	struct list_head list;
+};
+
+/**
+ * struct eficonfig_item - structure to construct eficonfig_entry
+ *
+ * @title:	title of entry
+ * @func:	callback function to be called when this entry is selected
+ * @data:	data to be passed to the callback function
+ */
+struct eficonfig_item {
+	char *title;
+	eficonfig_entry_func func;
+	void *data;
+};
+
+/**
+ * struct eficonfig_select_file_info - structure to be used for file selection
+ *
+ * @current_volume:	pointer to the efi_simple_file_system_protocol
+ * @dp_volume:		pointer to device path of the selected device
+ * @current_path:	pointer to the selected file path string
+ * @filepath_list:	list_head structure for file path list
+ * @file_selectred:	flag indicates file selecting status
+ */
+struct eficonfig_select_file_info {
+	struct efi_simple_file_system_protocol *current_volume;
+	struct efi_device_path *dp_volume;
+	u16 *current_path;
+	struct list_head filepath_list;
+	bool file_selected;
+};
+
+void eficonfig_print_msg(char *msg);
+void eficonfig_destroy(struct efimenu *efi_menu);
+efi_status_t eficonfig_process_quit(void *data);
+efi_status_t eficonfig_process_common(struct efimenu *efi_menu, char *menu_header);
+efi_status_t eficonfig_select_file_handler(void *data);
+efi_status_t eficonfig_get_unused_bootoption(u16 *buf,
+					     efi_uintn_t buf_size, u32 *index);
+efi_status_t eficonfig_append_bootorder(u16 index);
+
+#endif

include/efi_loader.h

@@ -142,6 +142,11 @@ static inline efi_status_t efi_launch_capsules(void)
 	EFI_GUID(0x63293792, 0xadf5, 0x9325, \
 		 0xb9, 0x9f, 0x4e, 0x0e, 0x45, 0x5c, 0x1b, 0x1e)
 
+/* GUID for the auto generated boot menu entry */
+#define EFICONFIG_AUTO_GENERATED_ENTRY_GUID \
+	EFI_GUID(0x38c1acc1, 0x9fc0, 0x41f0, \
+		 0xb9, 0x01, 0xfa, 0x74, 0xd6, 0xd6, 0xe4, 0xde)
+
 /* Use internal device tree when starting UEFI application */
 #define EFI_FDT_USE_INTERNAL NULL
 
@@ -226,6 +231,9 @@ const char *__efi_nesting_dec(void);
 #define EFI_CACHELINE_SIZE 128
 #endif
 
+/* max bootmenu title size for volume selection */
+#define BOOTMENU_DEVICE_NAME_MAX 16
+
 /* Key identifying current memory map */
 extern efi_uintn_t efi_memory_map_key;
 
@@ -249,6 +257,9 @@ extern const struct efi_hii_string_protocol efi_hii_string;
 
 uint16_t *efi_dp_str(struct efi_device_path *dp);
 
+/* GUID for the auto generated boot menu entry */
+extern const efi_guid_t efi_guid_bootmenu_auto_generated;
+
 /* GUID of the U-Boot root node */
 extern const efi_guid_t efi_u_boot_guid;
 #ifdef CONFIG_SANDBOX
@@ -314,6 +325,8 @@ extern const efi_guid_t efi_guid_firmware_management_protocol;
 extern const efi_guid_t efi_esrt_guid;
 /* GUID of the SMBIOS table */
 extern const efi_guid_t smbios_guid;
+/*GUID of console */
+extern const efi_guid_t efi_guid_text_input_protocol;
 
 extern char __efi_runtime_start[], __efi_runtime_stop[];
 extern char __efi_runtime_rel_start[], __efi_runtime_rel_stop[];
@@ -1064,4 +1077,28 @@ efi_status_t efi_esrt_populate(void);
 efi_status_t efi_load_capsule_drivers(void);
 
 efi_status_t platform_get_eventlog(struct udevice *dev, u64 *addr, u32 *sz);
+
+efi_status_t efi_locate_handle_buffer_int(enum efi_locate_search_type search_type,
+					  const efi_guid_t *protocol, void *search_key,
+					  efi_uintn_t *no_handles, efi_handle_t **buffer);
+
+efi_status_t efi_open_volume_int(struct efi_simple_file_system_protocol *this,
+				 struct efi_file_handle **root);
+efi_status_t efi_file_open_int(struct efi_file_handle *this,
+			       struct efi_file_handle **new_handle,
+			       u16 *file_name, u64 open_mode,
+			       u64 attributes);
+efi_status_t efi_file_close_int(struct efi_file_handle *file);
+efi_status_t efi_file_read_int(struct efi_file_handle *this,
+			       efi_uintn_t *buffer_size, void *buffer);
+efi_status_t efi_file_setpos_int(struct efi_file_handle *file, u64 pos);
+
+typedef efi_status_t (*efi_console_filter_func)(struct efi_input_key *key);
+efi_status_t efi_console_get_u16_string
+		(struct efi_simple_text_input_protocol *cin,
+		 u16 *buf, efi_uintn_t count, efi_console_filter_func filer_func,
+		 int row, int col);
+
+efi_status_t efi_disk_get_device_name(const efi_handle_t handle, char *buf, int size);
+
 #endif /* _EFI_LOADER_H */

lib/efi_loader/efi_bootmgr.c

@@ -19,6 +19,9 @@
 static const struct efi_boot_services *bs;
 static const struct efi_runtime_services *rs;
 
+const efi_guid_t efi_guid_bootmenu_auto_generated =
+		EFICONFIG_AUTO_GENERATED_ENTRY_GUID;
+
 /*
  * bootmgr implements the logic of trying to find a payload to boot
  * based on the BootOrder + BootXXXX variables, and then loading it.

lib/efi_loader/efi_boottime.c

@@ -2453,6 +2453,35 @@ static efi_status_t EFIAPI efi_protocols_per_handle(
 	return EFI_EXIT(EFI_SUCCESS);
 }
 
+efi_status_t efi_locate_handle_buffer_int(enum efi_locate_search_type search_type,
+					  const efi_guid_t *protocol, void *search_key,
+					  efi_uintn_t *no_handles, efi_handle_t **buffer)
+{
+	efi_status_t r;
+	efi_uintn_t buffer_size = 0;
+
+	if (!no_handles || !buffer) {
+		r = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+	*no_handles = 0;
+	*buffer = NULL;
+	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
+			      *buffer);
+	if (r != EFI_BUFFER_TOO_SMALL)
+		goto out;
+	r = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, buffer_size,
+			      (void **)buffer);
+	if (r != EFI_SUCCESS)
+		goto out;
+	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
+			      *buffer);
+	if (r == EFI_SUCCESS)
+		*no_handles = buffer_size / sizeof(efi_handle_t);
+out:
+	return r;
+}
+
 /**
  * efi_locate_handle_buffer() - locate handles implementing a protocol
  * @search_type: selection criterion
@@ -2474,30 +2503,13 @@ efi_status_t EFIAPI efi_locate_handle_buffer(
 			efi_uintn_t *no_handles, efi_handle_t **buffer)
 {
 	efi_status_t r;
-	efi_uintn_t buffer_size = 0;
 
 	EFI_ENTRY("%d, %pUs, %p, %p, %p", search_type, protocol, search_key,
 		  no_handles, buffer);
 
-	if (!no_handles || !buffer) {
+	r = efi_locate_handle_buffer_int(search_type, protocol, search_key,
-		r = EFI_INVALID_PARAMETER;
+					 no_handles, buffer);
-		goto out;
+
-	}
-	*no_handles = 0;
-	*buffer = NULL;
-	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
-			      *buffer);
-	if (r != EFI_BUFFER_TOO_SMALL)
-		goto out;
-	r = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, buffer_size,
-			      (void **)buffer);
-	if (r != EFI_SUCCESS)
-		goto out;
-	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
-			      *buffer);
-	if (r == EFI_SUCCESS)
-		*no_handles = buffer_size / sizeof(efi_handle_t);
-out:
 	return EFI_EXIT(r);
 }
 

lib/efi_loader/efi_console.c

@@ -7,6 +7,7 @@
 
 #define LOG_CATEGORY LOGC_EFI
 
+#include <ansi.h>
 #include <common.h>
 #include <charset.h>
 #include <malloc.h>
@@ -1318,3 +1319,72 @@ out_of_memory:
 	printf("ERROR: Out of memory\n");
 	return r;
 }
+
+/**
+ * efi_console_get_u16_string() - get user input string
+ *
+ * @cin:		protocol interface to EFI_SIMPLE_TEXT_INPUT_PROTOCOL
+ * @buf:		buffer to store user input string in UTF16
+ * @count:		number of u16 string including NULL terminator that buf has
+ * @filter_func:	callback to filter user input
+ * @row:		row number to locate user input form
+ * @col:		column number to locate user input form
+ * Return:		status code
+ */
+efi_status_t efi_console_get_u16_string(struct efi_simple_text_input_protocol *cin,
+					u16 *buf, efi_uintn_t count,
+					efi_console_filter_func filter_func,
+					int row, int col)
+{
+	efi_status_t ret;
+	efi_uintn_t len = 0;
+	struct efi_input_key key;
+
+	printf(ANSI_CURSOR_POSITION
+	       ANSI_CLEAR_LINE_TO_END
+	       ANSI_CURSOR_SHOW, row, col);
+
+	ret = EFI_CALL(cin->reset(cin, false));
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	for (;;) {
+		do {
+			ret = EFI_CALL(cin->read_key_stroke(cin, &key));
+			mdelay(10);
+		} while (ret == EFI_NOT_READY);
+
+		if (key.unicode_char == u'\b') {
+			if (len > 0)
+				buf[--len] = u'\0';
+
+			printf(ANSI_CURSOR_POSITION
+			       "%ls"
+			       ANSI_CLEAR_LINE_TO_END, row, col, buf);
+			continue;
+		} else if (key.unicode_char == u'\r') {
+			buf[len] = u'\0';
+			return EFI_SUCCESS;
+		} else if (key.unicode_char == 0x3 || key.scan_code == 23) {
+			return EFI_ABORTED;
+		} else if (key.unicode_char < 0x20) {
+			/* ignore control codes other than Ctrl+C, '\r' and '\b' */
+			continue;
+		} else if (key.scan_code != 0) {
+			/* only accept single ESC press for cancel */
+			continue;
+		}
+
+		if (filter_func) {
+			if (filter_func(&key) != EFI_SUCCESS)
+				continue;
+		}
+
+		if (len >= (count - 1))
+			continue;
+
+		buf[len] = key.unicode_char;
+		len++;
+		printf(ANSI_CURSOR_POSITION "%ls", row, col, buf);
+	}
+}

lib/efi_loader/efi_disk.c

@@ -760,3 +760,53 @@ efi_status_t efi_disk_init(void)
 
 	return EFI_SUCCESS;
 }
+
+/**
+ * efi_disk_get_device_name() - get U-Boot device name associated with EFI handle
+ *
+ * @handle:	pointer to the EFI handle
+ * @buf:	pointer to the buffer to store the string
+ * @size:	size of buffer
+ * Return:	status code
+ */
+efi_status_t efi_disk_get_device_name(const efi_handle_t handle, char *buf, int size)
+{
+	int count;
+	int diskid;
+	enum uclass_id id;
+	unsigned int part;
+	struct udevice *dev;
+	struct blk_desc *desc;
+	const char *if_typename;
+	bool is_partition = false;
+	struct disk_part *part_data;
+
+	if (!handle || !buf || !size)
+		return EFI_INVALID_PARAMETER;
+
+	dev = handle->dev;
+	id = device_get_uclass_id(dev);
+	if (id == UCLASS_BLK) {
+		desc = dev_get_uclass_plat(dev);
+	} else if (id == UCLASS_PARTITION) {
+		desc = dev_get_uclass_plat(dev_get_parent(dev));
+		is_partition = true;
+	} else {
+		return EFI_INVALID_PARAMETER;
+	}
+	if_typename = blk_get_if_type_name(desc->if_type);
+	diskid = desc->devnum;
+
+	if (is_partition) {
+		part_data = dev_get_uclass_plat(dev);
+		part = part_data->partnum;
+		count = snprintf(buf, size, "%s %d:%d", if_typename, diskid, part);
+	} else {
+		count = snprintf(buf, size, "%s %d", if_typename, diskid);
+	}
+
+	if (count < 0 || (count + 1) > size)
+		return EFI_INVALID_PARAMETER;
+
+	return EFI_SUCCESS;
+}

lib/efi_loader/efi_file.c

@@ -246,7 +246,7 @@ error:
 	return NULL;
 }
 
-static efi_status_t efi_file_open_int(struct efi_file_handle *this,
+efi_status_t efi_file_open_int(struct efi_file_handle *this,
 			       struct efi_file_handle **new_handle,
 			       u16 *file_name, u64 open_mode,
 			       u64 attributes)
@@ -369,11 +369,17 @@ static efi_status_t file_close(struct file_handle *fh)
 	return EFI_SUCCESS;
 }
 
-static efi_status_t EFIAPI efi_file_close(struct efi_file_handle *file)
+efi_status_t efi_file_close_int(struct efi_file_handle *file)
 {
 	struct file_handle *fh = to_fh(file);
+
+	return file_close(fh);
+}
+
+static efi_status_t EFIAPI efi_file_close(struct efi_file_handle *file)
+{
 	EFI_ENTRY("%p", file);
-	return EFI_EXIT(file_close(fh));
+	return EFI_EXIT(efi_file_close_int(file));
 }
 
 static efi_status_t EFIAPI efi_file_delete(struct efi_file_handle *file)
@@ -562,7 +568,7 @@ static efi_status_t dir_read(struct file_handle *fh, u64 *buffer_size,
 	return EFI_SUCCESS;
 }
 
-static efi_status_t efi_file_read_int(struct efi_file_handle *this,
+efi_status_t efi_file_read_int(struct efi_file_handle *this,
 			       efi_uintn_t *buffer_size, void *buffer)
 {
 	struct file_handle *fh = to_fh(this);
@@ -773,24 +779,11 @@ out:
 	return EFI_EXIT(ret);
 }
 
-/**
+efi_status_t efi_file_setpos_int(struct efi_file_handle *file, u64 pos)
- * efi_file_setpos() - set current position in file
- *
- * This function implements the SetPosition service of the EFI file protocol.
- * See the UEFI spec for details.
- *
- * @file:	file handle
- * @pos:	new file position
- * Return:	status code
- */
-static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
-					   u64 pos)
 {
 	struct file_handle *fh = to_fh(file);
 	efi_status_t ret = EFI_SUCCESS;
 
-	EFI_ENTRY("%p, %llu", file, pos);
-
 	if (fh->isdir) {
 		if (pos != 0) {
 			ret = EFI_UNSUPPORTED;
@@ -812,6 +805,28 @@ static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
 	fh->offset = pos;
 
 error:
+	return ret;
+}
+
+/**
+ * efi_file_setpos() - set current position in file
+ *
+ * This function implements the SetPosition service of the EFI file protocol.
+ * See the UEFI spec for details.
+ *
+ * @file:	file handle
+ * @pos:	new file position
+ * Return:	status code
+ */
+static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
+					   u64 pos)
+{
+	efi_status_t ret = EFI_SUCCESS;
+
+	EFI_ENTRY("%p, %llu", file, pos);
+
+	ret = efi_file_setpos_int(file, pos);
+
 	return EFI_EXIT(ret);
 }
 
@@ -1138,17 +1153,23 @@ struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp)
 	return f;
 }
 
-static efi_status_t EFIAPI
+efi_status_t efi_open_volume_int(struct efi_simple_file_system_protocol *this,
-efi_open_volume(struct efi_simple_file_system_protocol *this,
 				 struct efi_file_handle **root)
 {
 	struct file_system *fs = to_fs(this);
 
-	EFI_ENTRY("%p, %p", this, root);
-
 	*root = file_open(fs, NULL, NULL, 0, 0);
 
-	return EFI_EXIT(EFI_SUCCESS);
+	return EFI_SUCCESS;
+}
+
+static efi_status_t EFIAPI
+efi_open_volume(struct efi_simple_file_system_protocol *this,
+		struct efi_file_handle **root)
+{
+	EFI_ENTRY("%p, %p", this, root);
+
+	return EFI_EXIT(efi_open_volume_int(this, root));
 }
 
 struct efi_simple_file_system_protocol *