Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

3 files changed, 1099 insertions, 0 deletions

diff --git a/qemu/roms/ipxe/src/hci/tui/login_ui.c b/qemu/roms/ipxe/src/hci/tui/login_ui.c
new file mode 100644
index 000000000..996b68a0a
--- /dev/null
+++ b/qemu/roms/ipxe/src/hci/tui/login_ui.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Login UI
+ *
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <curses.h>
+#include <ipxe/console.h>
+#include <ipxe/settings.h>
+#include <ipxe/editbox.h>
+#include <ipxe/keys.h>
+#include <ipxe/ansicol.h>
+#include <ipxe/login_ui.h>
+
+/* Screen layout */
+#define USERNAME_LABEL_ROW	( ( LINES / 2U ) - 4U )
+#define USERNAME_ROW		( ( LINES / 2U ) - 2U )
+#define PASSWORD_LABEL_ROW	( ( LINES / 2U ) + 2U )
+#define PASSWORD_ROW		( ( LINES / 2U ) + 4U )
+#define LABEL_COL		( ( COLS / 2U ) - 4U )
+#define EDITBOX_COL		( ( COLS / 2U ) - 10U )
+#define EDITBOX_WIDTH		20U
+
+int login_ui ( void ) {
+	char username[64];
+	char password[64];
+	struct edit_box username_box;
+	struct edit_box password_box;
+	struct edit_box *current_box = &username_box;
+	int key;
+	int rc = -EINPROGRESS;
+
+	/* Fetch current setting values */
+	fetch_string_setting ( NULL, &username_setting, username,
+			       sizeof ( username ) );
+	fetch_string_setting ( NULL, &password_setting, password,
+			       sizeof ( password ) );
+
+	/* Initialise UI */
+	initscr();
+	start_color();
+	init_editbox ( &username_box, username, sizeof ( username ), NULL,
+		       USERNAME_ROW, EDITBOX_COL, EDITBOX_WIDTH, 0 );
+	init_editbox ( &password_box, password, sizeof ( password ), NULL,
+		       PASSWORD_ROW, EDITBOX_COL, EDITBOX_WIDTH,
+		       EDITBOX_STARS );
+
+	/* Draw initial UI */
+	color_set ( CPAIR_NORMAL, NULL );
+	erase();
+	attron ( A_BOLD );
+	mvprintw ( USERNAME_LABEL_ROW, LABEL_COL, "Username:" );
+	mvprintw ( PASSWORD_LABEL_ROW, LABEL_COL, "Password:" );
+	attroff ( A_BOLD );
+	color_set ( CPAIR_EDIT, NULL );
+	draw_editbox ( &username_box );
+	draw_editbox ( &password_box );
+
+	/* Main loop */
+	while ( rc == -EINPROGRESS ) {
+
+		draw_editbox ( current_box );
+
+		key = getkey ( 0 );
+		switch ( key ) {
+		case KEY_DOWN:
+			current_box = &password_box;
+			break;
+		case KEY_UP:
+			current_box = &username_box;
+			break;
+		case TAB:
+			current_box = ( ( current_box == &username_box ) ?
+					&password_box : &username_box );
+			break;
+		case KEY_ENTER:
+			if ( current_box == &username_box ) {
+				current_box = &password_box;
+			} else {
+				rc = 0;
+			}
+			break;
+		case CTRL_C:
+		case ESC:
+			rc = -ECANCELED;
+			break;
+		default:
+			edit_editbox ( current_box, key );
+			break;
+		}
+	}
+
+	/* Terminate UI */
+	color_set ( CPAIR_NORMAL, NULL );
+	erase();
+	endwin();
+
+	if ( rc != 0 )
+		return rc;
+
+	/* Store settings */
+	if ( ( rc = store_setting ( NULL, &username_setting, username,
+				    strlen ( username ) ) ) != 0 )
+		return rc;
+	if ( ( rc = store_setting ( NULL, &password_setting, password,
+				    strlen ( password ) ) ) != 0 )
+		return rc;
+
+	return 0;
+}
diff --git a/qemu/roms/ipxe/src/hci/tui/menu_ui.c b/qemu/roms/ipxe/src/hci/tui/menu_ui.c
new file mode 100644
index 000000000..0a9566def
--- /dev/null
+++ b/qemu/roms/ipxe/src/hci/tui/menu_ui.c
@@ -0,0 +1,363 @@
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Menu interface
+ *
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <curses.h>
+#include <ipxe/keys.h>
+#include <ipxe/timer.h>
+#include <ipxe/console.h>
+#include <ipxe/ansicol.h>
+#include <ipxe/menu.h>
+
+/* Screen layout */
+#define TITLE_ROW	1U
+#define MENU_ROW	3U
+#define MENU_COL	1U
+#define MENU_ROWS	( LINES - 2U - MENU_ROW )
+#define MENU_COLS	( COLS - 2U )
+#define MENU_PAD	2U
+
+/** A menu user interface */
+struct menu_ui {
+	/** Menu */
+	struct menu *menu;
+	/** Number of menu items */
+	unsigned int count;
+	/** Currently selected item */
+	int selected;
+	/** First visible item */
+	int first_visible;
+	/** Timeout (0=indefinite) */
+	unsigned long timeout;
+};
+
+/**
+ * Return a numbered menu item
+ *
+ * @v menu		Menu
+ * @v index		Index
+ * @ret item		Menu item, or NULL
+ */
+static struct menu_item * menu_item ( struct menu *menu, unsigned int index ) {
+	struct menu_item *item;
+
+	list_for_each_entry ( item, &menu->items, list ) {
+		if ( index-- == 0 )
+			return item;
+	}
+
+	return NULL;
+}
+
+/**
+ * Draw a numbered menu item
+ *
+ * @v ui		Menu user interface
+ * @v index		Index
+ */
+static void draw_menu_item ( struct menu_ui *ui, int index ) {
+	struct menu_item *item;
+	unsigned int row_offset;
+	char buf[ MENU_COLS + 1 /* NUL */ ];
+	char timeout_buf[6]; /* "(xxx)" + NUL */
+	size_t timeout_len;
+	size_t max_len;
+	size_t len;
+
+	/* Move to start of row */
+	row_offset = ( index - ui->first_visible );
+	move ( ( MENU_ROW + row_offset ), MENU_COL );
+
+	/* Get menu item */
+	item = menu_item ( ui->menu, index );
+	if ( item ) {
+
+		/* Draw separators in a different colour */
+		if ( ! item->label )
+			color_set ( CPAIR_SEPARATOR, NULL );
+
+		/* Highlight if this is the selected item */
+		if ( index == ui->selected ) {
+			color_set ( CPAIR_SELECT, NULL );
+			attron ( A_BOLD );
+		}
+
+		/* Construct row */
+		memset ( buf, ' ', ( sizeof ( buf ) - 1 ) );
+		buf[ sizeof ( buf ) -1 ] = '\0';
+		len = strlen ( item->text );
+		max_len = ( sizeof ( buf ) - 1 /* NUL */ - ( 2 * MENU_PAD ) );
+		if ( len > max_len )
+			len = max_len;
+		memcpy ( ( buf + MENU_PAD ), item->text, len );
+
+		/* Add timeout if applicable */
+		timeout_len =
+			snprintf ( timeout_buf, sizeof ( timeout_buf ), "(%ld)",
+				   ( ( ui->timeout + TICKS_PER_SEC - 1 ) /
+				     TICKS_PER_SEC ) );
+		if ( ( index == ui->selected ) && ( ui->timeout != 0 ) ) {
+			memcpy ( ( buf + MENU_COLS - MENU_PAD - timeout_len ),
+				 timeout_buf, timeout_len );
+		}
+
+		/* Print row */
+		printw ( "%s", buf );
+
+		/* Reset attributes */
+		color_set ( CPAIR_NORMAL, NULL );
+		attroff ( A_BOLD );
+
+	} else {
+		/* Clear row if there is no corresponding menu item */
+		clrtoeol();
+	}
+
+	/* Move cursor back to start of row */
+	move ( ( MENU_ROW + row_offset ), MENU_COL );
+}
+
+/**
+ * Draw the current block of menu items
+ *
+ * @v ui		Menu user interface
+ */
+static void draw_menu_items ( struct menu_ui *ui ) {
+	unsigned int i;
+
+	/* Jump scroll to correct point in list */
+	while ( ui->first_visible < ui->selected )
+		ui->first_visible += MENU_ROWS;
+	while ( ui->first_visible > ui->selected )
+		ui->first_visible -= MENU_ROWS;
+
+	/* Draw ellipses before and/or after the list as necessary */
+	color_set ( CPAIR_SEPARATOR, NULL );
+	mvaddstr ( ( MENU_ROW - 1 ), ( MENU_COL + MENU_PAD ),
+		   ( ( ui->first_visible > 0 ) ? "..." : "   " ) );
+	mvaddstr ( ( MENU_ROW + MENU_ROWS ), ( MENU_COL + MENU_PAD ),
+		   ( ( ( ui->first_visible + MENU_ROWS ) < ui->count ) ?
+		     "..." : "   " ) );
+	color_set ( CPAIR_NORMAL, NULL );
+
+	/* Draw visible items */
+	for ( i = 0 ; i < MENU_ROWS ; i++ )
+		draw_menu_item ( ui, ( ui->first_visible + i ) );
+}
+
+/**
+ * Menu main loop
+ *
+ * @v ui		Menu user interface
+ * @ret selected	Selected item
+ * @ret rc		Return status code
+ */
+static int menu_loop ( struct menu_ui *ui, struct menu_item **selected ) {
+	struct menu_item *item;
+	unsigned long timeout;
+	unsigned int delta;
+	int current;
+	int key;
+	int i;
+	int move;
+	int chosen = 0;
+	int rc = 0;
+
+	do {
+		/* Record current selection */
+		current = ui->selected;
+
+		/* Calculate timeout as remainder of current second */
+		timeout = ( ui->timeout % TICKS_PER_SEC );
+		if ( ( timeout == 0 ) && ( ui->timeout != 0 ) )
+			timeout = TICKS_PER_SEC;
+		ui->timeout -= timeout;
+
+		/* Get key */
+		move = 0;
+		key = getkey ( timeout );
+		if ( key < 0 ) {
+			/* Choose default if we finally time out */
+			if ( ui->timeout == 0 )
+				chosen = 1;
+		} else {
+			/* Cancel any timeout */
+			ui->timeout = 0;
+
+			/* Handle key */
+			switch ( key ) {
+			case KEY_UP:
+				move = -1;
+				break;
+			case KEY_DOWN:
+				move = +1;
+				break;
+			case KEY_PPAGE:
+				move = ( ui->first_visible - ui->selected - 1 );
+				break;
+			case KEY_NPAGE:
+				move = ( ui->first_visible - ui->selected
+					 + MENU_ROWS );
+				break;
+			case KEY_HOME:
+				move = -ui->count;
+				break;
+			case KEY_END:
+				move = +ui->count;
+				break;
+			case ESC:
+			case CTRL_C:
+				rc = -ECANCELED;
+				break;
+			case CR:
+			case LF:
+				chosen = 1;
+				break;
+			default:
+				i = 0;
+				list_for_each_entry ( item, &ui->menu->items,
+						      list ) {
+					if ( ! ( item->shortcut &&
+						 ( item->shortcut == key ) ) ) {
+						i++;
+						continue;
+					}
+					ui->selected = i;
+					if ( item->label ) {
+						chosen = 1;
+					} else {
+						move = +1;
+					}
+				}
+				break;
+			}
+		}
+
+		/* Move selection, if applicable */
+		while ( move ) {
+			ui->selected += move;
+			if ( ui->selected < 0 ) {
+				ui->selected = 0;
+				move = +1;
+			} else if ( ui->selected >= ( int ) ui->count ) {
+				ui->selected = ( ui->count - 1 );
+				move = -1;
+			}
+			item = menu_item ( ui->menu, ui->selected );
+			if ( item->label )
+				break;
+			move = ( ( move > 0 ) ? +1 : -1 );
+		}
+
+		/* Redraw selection if necessary */
+		if ( ( ui->selected != current ) || ( timeout != 0 ) ) {
+			draw_menu_item ( ui, current );
+			delta = ( ui->selected - ui->first_visible );
+			if ( delta >= MENU_ROWS )
+				draw_menu_items ( ui );
+			draw_menu_item ( ui, ui->selected );
+		}
+
+		/* Record selection */
+		item = menu_item ( ui->menu, ui->selected );
+		assert ( item != NULL );
+		assert ( item->label != NULL );
+		*selected = item;
+
+	} while ( ( rc == 0 ) && ! chosen );
+
+	return rc;
+}
+
+/**
+ * Show menu
+ *
+ * @v menu		Menu
+ * @v timeout		Timeout period, in ticks (0=indefinite)
+ * @ret selected	Selected item
+ * @ret rc		Return status code
+ */
+int show_menu ( struct menu *menu, unsigned long timeout,
+		const char *select, struct menu_item **selected ) {
+	struct menu_item *item;
+	struct menu_ui ui;
+	char buf[ MENU_COLS + 1 /* NUL */ ];
+	int labelled_count = 0;
+	int rc;
+
+	/* Initialise UI */
+	memset ( &ui, 0, sizeof ( ui ) );
+	ui.menu = menu;
+	ui.timeout = timeout;
+	list_for_each_entry ( item, &menu->items, list ) {
+		if ( item->label ) {
+			if ( ! labelled_count )
+				ui.selected = ui.count;
+			labelled_count++;
+			if ( select ) {
+				if ( strcmp ( select, item->label ) == 0 )
+					ui.selected = ui.count;
+			} else {
+				if ( item->is_default )
+					ui.selected = ui.count;
+			}
+		}
+		ui.count++;
+	}
+	if ( ! labelled_count ) {
+		/* Menus with no labelled items cannot be selected
+		 * from, and will seriously confuse the navigation
+		 * logic.  Refuse to display any such menus.
+		 */
+		return -ENOENT;
+	}
+
+	/* Initialise screen */
+	initscr();
+	start_color();
+	color_set ( CPAIR_NORMAL, NULL );
+	curs_set ( 0 );
+	erase();
+
+	/* Draw initial content */
+	attron ( A_BOLD );
+	snprintf ( buf, sizeof ( buf ), "%s", ui.menu->title );
+	mvprintw ( TITLE_ROW, ( ( COLS - strlen ( buf ) ) / 2 ), "%s", buf );
+	attroff ( A_BOLD );
+	draw_menu_items ( &ui );
+	draw_menu_item ( &ui, ui.selected );
+
+	/* Enter main loop */
+	rc = menu_loop ( &ui, selected );
+	assert ( *selected );
+
+	/* Clear screen */
+	endwin();
+
+	return rc;
+}
diff --git a/qemu/roms/ipxe/src/hci/tui/settings_ui.c b/qemu/roms/ipxe/src/hci/tui/settings_ui.c
new file mode 100644
index 000000000..221839730
--- /dev/null
+++ b/qemu/roms/ipxe/src/hci/tui/settings_ui.c
@@ -0,0 +1,603 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <curses.h>
+#include <ipxe/console.h>
+#include <ipxe/settings.h>
+#include <ipxe/editbox.h>
+#include <ipxe/keys.h>
+#include <ipxe/ansicol.h>
+#include <ipxe/settings_ui.h>
+
+/** @file
+ *
+ * Option configuration console
+ *
+ */
+
+/* Screen layout */
+#define TITLE_ROW		1U
+#define SETTINGS_LIST_ROW	3U
+#define SETTINGS_LIST_COL	1U
+#define SETTINGS_LIST_ROWS	( LINES - 6U - SETTINGS_LIST_ROW )
+#define INFO_ROW		( LINES - 5U )
+#define ALERT_ROW		( LINES - 2U )
+#define INSTRUCTION_ROW		( LINES - 2U )
+#define INSTRUCTION_PAD "     "
+
+/** Layout of text within a setting widget */
+#define SETTING_ROW_TEXT( cols ) struct {				\
+	char start[0];							\
+	char pad1[1];							\
+	union {								\
+		char settings[ cols - 1 - 1 - 1 - 1 ];			\
+		struct {						\
+			char name[15];					\
+			char pad2[1];					\
+			char value[ cols - 1 - 15 - 1 - 1 - 1 - 1 ];	\
+		} setting;						\
+	} u;								\
+	char pad3[1];							\
+	char nul;							\
+} __attribute__ (( packed ))
+
+/** A setting row widget */
+struct setting_row_widget {
+	/** Target configuration settings block
+	 *
+	 * Valid only for rows that lead to new settings blocks.
+	 */
+	struct settings *settings;
+	/** Configuration setting origin
+	 *
+	 * Valid only for rows that represent individual settings.
+	 */
+	struct settings *origin;
+	/** Configuration setting
+	 *
+	 * Valid only for rows that represent individual settings.
+	 */
+	struct setting setting;
+	/** Screen row */
+	unsigned int row;
+	/** Screen column */
+	unsigned int col;
+	/** Edit box widget used for editing setting */
+	struct edit_box editbox;
+	/** Editing in progress flag */
+	int editing;
+	/** Buffer for setting's value */
+	char value[256]; /* enough size for a DHCP string */
+};
+
+/** A settings widget */
+struct setting_widget {
+	/** Settings block */
+	struct settings *settings;
+	/** Number of rows */
+	unsigned int num_rows;
+	/** Current row index */
+	unsigned int current;
+        /** Index of the first visible row, for scrolling. */
+	unsigned int first_visible;
+	/** Active row */
+	struct setting_row_widget row;
+};
+
+/**
+ * Select a setting row
+ *
+ * @v widget		Setting widget
+ * @v index		Index of setting row
+ * @ret count		Number of settings rows
+ */
+static unsigned int select_setting_row ( struct setting_widget *widget,
+					 unsigned int index ) {
+	SETTING_ROW_TEXT ( COLS ) *text;
+	struct settings *settings;
+	struct setting *setting;
+	struct setting *previous = NULL;
+	unsigned int count = 0;
+
+	/* Initialise structure */
+	memset ( &widget->row, 0, sizeof ( widget->row ) );
+	widget->current = index;
+	widget->row.row = ( SETTINGS_LIST_ROW + index - widget->first_visible );
+	widget->row.col = SETTINGS_LIST_COL;
+
+	/* Include parent settings block, if applicable */
+	if ( widget->settings->parent && ( count++ == index ) ) {
+		widget->row.settings = widget->settings->parent;
+		snprintf ( widget->row.value, sizeof ( widget->row.value ),
+			   "../" );
+	}
+
+	/* Include any child settings blocks, if applicable */
+	list_for_each_entry ( settings, &widget->settings->children, siblings ){
+		if ( count++ == index ) {
+			widget->row.settings = settings;
+			snprintf ( widget->row.value,
+				   sizeof ( widget->row.value ), "%s/",
+				   settings->name );
+		}
+	}
+
+	/* Include any applicable settings */
+	for_each_table_entry ( setting, SETTINGS ) {
+
+		/* Skip inapplicable settings */
+		if ( ! setting_applies ( widget->settings, setting ) )
+			continue;
+
+		/* Skip duplicate settings */
+		if ( previous && ( setting_cmp ( setting, previous ) == 0 ) )
+			continue;
+		previous = setting;
+
+		/* Read current setting value and origin */
+		if ( count++ == index ) {
+			fetchf_setting ( widget->settings, setting,
+					 &widget->row.origin,
+					 &widget->row.setting,
+					 widget->row.value,
+					 sizeof ( widget->row.value ) );
+		}
+	}
+
+	/* Initialise edit box */
+	init_editbox ( &widget->row.editbox, widget->row.value,
+		       sizeof ( widget->row.value ), NULL, widget->row.row,
+		       ( widget->row.col +
+			 offsetof ( typeof ( *text ), u.setting.value ) ),
+		       sizeof ( text->u.setting.value ), 0 );
+
+	return count;
+}
+
+/**
+ * Copy string without NUL termination
+ *
+ * @v dest		Destination
+ * @v src		Source
+ * @v len		Maximum length of destination
+ * @ret len		Length of (unterminated) string
+ */
+static size_t string_copy ( char *dest, const char *src, size_t len ) {
+	size_t src_len;
+
+	src_len = strlen ( src );
+	if ( len > src_len )
+		len = src_len;
+	memcpy ( dest, src, len );
+	return len;
+}
+
+/**
+ * Draw setting row
+ *
+ * @v widget		Setting widget
+ */
+static void draw_setting_row ( struct setting_widget *widget ) {
+	SETTING_ROW_TEXT ( COLS ) text;
+	unsigned int curs_offset;
+	char *value;
+
+	/* Fill row with spaces */
+	memset ( &text, ' ', sizeof ( text ) );
+	text.nul = '\0';
+
+	/* Construct row content */
+	if ( widget->row.settings ) {
+
+		/* Construct space-padded name */
+		curs_offset = ( offsetof ( typeof ( text ), u.settings ) +
+				string_copy ( text.u.settings,
+					      widget->row.value,
+					      sizeof ( text.u.settings ) ) );
+
+	} else {
+
+		/* Construct dot-padded name */
+		memset ( text.u.setting.name, '.',
+			 sizeof ( text.u.setting.name ) );
+		string_copy ( text.u.setting.name, widget->row.setting.name,
+			      sizeof ( text.u.setting.name ) );
+
+		/* Construct space-padded value */
+		value = widget->row.value;
+		if ( ! *value )
+			value = "<not specified>";
+		curs_offset = ( offsetof ( typeof ( text ), u.setting.value ) +
+				string_copy ( text.u.setting.value, value,
+					      sizeof ( text.u.setting.value )));
+	}
+
+	/* Print row */
+	if ( ( widget->row.origin == widget->settings ) ||
+	     ( widget->row.settings != NULL ) ) {
+		attron ( A_BOLD );
+	}
+	mvprintw ( widget->row.row, widget->row.col, "%s", text.start );
+	attroff ( A_BOLD );
+	move ( widget->row.row, widget->row.col + curs_offset );
+}
+
+/**
+ * Edit setting widget
+ *
+ * @v widget		Setting widget
+ * @v key		Key pressed by user
+ * @ret key		Key returned to application, or zero
+ */
+static int edit_setting ( struct setting_widget *widget, int key ) {
+	assert ( widget->row.setting.name != NULL );
+	widget->row.editing = 1;
+	return edit_editbox ( &widget->row.editbox, key );
+}
+
+/**
+ * Save setting widget value back to configuration settings
+ *
+ * @v widget		Setting widget
+ */
+static int save_setting ( struct setting_widget *widget ) {
+	assert ( widget->row.setting.name != NULL );
+	return storef_setting ( widget->settings, &widget->row.setting,
+				widget->row.value );
+}
+
+/**
+ * Print message centred on specified row
+ *
+ * @v row		Row
+ * @v fmt		printf() format string
+ * @v args		printf() argument list
+ */
+static void vmsg ( unsigned int row, const char *fmt, va_list args ) {
+	char buf[COLS];
+	size_t len;
+
+	len = vsnprintf ( buf, sizeof ( buf ), fmt, args );
+	mvprintw ( row, ( ( COLS - len ) / 2 ), "%s", buf );
+}
+
+/**
+ * Print message centred on specified row
+ *
+ * @v row		Row
+ * @v fmt		printf() format string
+ * @v ..		printf() arguments
+ */
+static void msg ( unsigned int row, const char *fmt, ... ) {
+	va_list args;
+
+	va_start ( args, fmt );
+	vmsg ( row, fmt, args );
+	va_end ( args );
+}
+
+/**
+ * Clear message on specified row
+ *
+ * @v row		Row
+ */
+static void clearmsg ( unsigned int row ) {
+	move ( row, 0 );
+	clrtoeol();
+}
+
+/**
+ * Print alert message
+ *
+ * @v fmt		printf() format string
+ * @v args		printf() argument list
+ */
+static void valert ( const char *fmt, va_list args ) {
+	clearmsg ( ALERT_ROW );
+	color_set ( CPAIR_ALERT, NULL );
+	vmsg ( ALERT_ROW, fmt, args );
+	sleep ( 2 );
+	color_set ( CPAIR_NORMAL, NULL );
+	clearmsg ( ALERT_ROW );
+}
+
+/**
+ * Print alert message
+ *
+ * @v fmt		printf() format string
+ * @v ...		printf() arguments
+ */
+static void alert ( const char *fmt, ... ) {
+	va_list args;
+
+	va_start ( args, fmt );
+	valert ( fmt, args );
+	va_end ( args );
+}
+
+/**
+ * Draw title row
+ *
+ * @v widget		Setting widget
+ */
+static void draw_title_row ( struct setting_widget *widget ) {
+	const char *name;
+
+	clearmsg ( TITLE_ROW );
+	name = settings_name ( widget->settings );
+	attron ( A_BOLD );
+	msg ( TITLE_ROW, "iPXE configuration settings%s%s",
+	      ( name[0] ? " - " : "" ), name );
+	attroff ( A_BOLD );
+}
+
+/**
+ * Draw information row
+ *
+ * @v widget		Setting widget
+ */
+static void draw_info_row ( struct setting_widget *widget ) {
+	char buf[32];
+
+	/* Draw nothing unless this row represents a setting */
+	clearmsg ( INFO_ROW );
+	clearmsg ( INFO_ROW + 1 );
+	if ( ! widget->row.setting.name )
+		return;
+
+	/* Determine a suitable setting name */
+	setting_name ( ( widget->row.origin ?
+			 widget->row.origin : widget->settings ),
+		       &widget->row.setting, buf, sizeof ( buf ) );
+
+	/* Draw row */
+	attron ( A_BOLD );
+	msg ( INFO_ROW, "%s - %s", buf, widget->row.setting.description );
+	attroff ( A_BOLD );
+	color_set ( CPAIR_URL, NULL );
+	msg ( ( INFO_ROW + 1 ), "http://ipxe.org/cfg/%s",
+	      widget->row.setting.name );
+	color_set ( CPAIR_NORMAL, NULL );
+}
+
+/**
+ * Draw instruction row
+ *
+ * @v widget		Setting widget
+ */
+static void draw_instruction_row ( struct setting_widget *widget ) {
+
+	clearmsg ( INSTRUCTION_ROW );
+	if ( widget->row.editing ) {
+		msg ( INSTRUCTION_ROW,
+		      "Enter - accept changes" INSTRUCTION_PAD
+		      "Ctrl-C - discard changes" );
+	} else {
+		msg ( INSTRUCTION_ROW,
+		      "%sCtrl-X - exit configuration utility",
+		      ( ( widget->row.origin == widget->settings ) ?
+			"Ctrl-D - delete setting" INSTRUCTION_PAD : "" ) );
+	}
+}
+
+/**
+ * Reveal setting row
+ *
+ * @v widget		Setting widget
+ * @v index		Index of setting row
+ */
+static void reveal_setting_row ( struct setting_widget *widget,
+				 unsigned int index ) {
+	unsigned int i;
+
+	/* Simply return if setting N is already on-screen. */
+	if ( index - widget->first_visible < SETTINGS_LIST_ROWS )
+		return;
+
+	/* Jump scroll to make the specified setting row visible. */
+	while ( widget->first_visible < index )
+		widget->first_visible += SETTINGS_LIST_ROWS;
+	while ( widget->first_visible > index )
+		widget->first_visible -= SETTINGS_LIST_ROWS;
+
+	/* Draw ellipses before and/or after the settings list to
+	 * represent any invisible settings.
+	 */
+	mvaddstr ( SETTINGS_LIST_ROW - 1,
+		   SETTINGS_LIST_COL + 1,
+		   widget->first_visible > 0 ? "..." : "   " );
+	mvaddstr ( SETTINGS_LIST_ROW + SETTINGS_LIST_ROWS,
+		   SETTINGS_LIST_COL + 1,
+		   ( ( widget->first_visible + SETTINGS_LIST_ROWS )
+		     < widget->num_rows ? "..." : "   " ) );
+
+	/* Draw visible settings. */
+	for ( i = 0; i < SETTINGS_LIST_ROWS; i++ ) {
+		if ( ( widget->first_visible + i ) < widget->num_rows ) {
+			select_setting_row ( widget,
+					     widget->first_visible + i );
+			draw_setting_row ( widget );
+		} else {
+			clearmsg ( SETTINGS_LIST_ROW + i );
+		}
+	}
+}
+
+/**
+ * Reveal setting row
+ *
+ * @v widget		Setting widget
+ * @v settings		Settings block
+ */
+static void init_widget ( struct setting_widget *widget,
+			  struct settings *settings ) {
+
+	widget->settings = settings_target ( settings );
+	widget->num_rows = select_setting_row ( widget, 0 );
+	widget->first_visible = SETTINGS_LIST_ROWS;
+	draw_title_row ( widget );
+	reveal_setting_row ( widget, 0 );
+	select_setting_row ( widget, 0 );
+}
+
+static int main_loop ( struct settings *settings ) {
+	struct setting_widget widget;
+	int redraw = 1;
+	int move;
+	unsigned int next;
+	int key;
+	int rc;
+
+	/* Print initial screen content */
+	color_set ( CPAIR_NORMAL, NULL );
+	memset ( &widget, 0, sizeof ( widget ) );
+	init_widget ( &widget, settings );
+
+	while ( 1 ) {
+
+		/* Redraw rows if necessary */
+		if ( redraw ) {
+			draw_info_row ( &widget );
+			draw_instruction_row ( &widget );
+			color_set ( ( widget.row.editing ?
+				      CPAIR_EDIT : CPAIR_SELECT ), NULL );
+			draw_setting_row ( &widget );
+			color_set ( CPAIR_NORMAL, NULL );
+			curs_set ( widget.row.editing );
+			redraw = 0;
+		}
+
+		if ( widget.row.editing ) {
+
+			/* Sanity check */
+			assert ( widget.row.setting.name != NULL );
+
+			/* Redraw edit box */
+			color_set ( CPAIR_EDIT, NULL );
+			draw_editbox ( &widget.row.editbox );
+			color_set ( CPAIR_NORMAL, NULL );
+
+			/* Process keypress */
+			key = edit_setting ( &widget, getkey ( 0 ) );
+			switch ( key ) {
+			case CR:
+			case LF:
+				if ( ( rc = save_setting ( &widget ) ) != 0 )
+					alert ( " %s ", strerror ( rc ) );
+				/* Fall through */
+			case CTRL_C:
+				select_setting_row ( &widget, widget.current );
+				redraw = 1;
+				break;
+			default:
+				/* Do nothing */
+				break;
+			}
+
+		} else {
+
+			/* Process keypress */
+			key = getkey ( 0 );
+			move = 0;
+			switch ( key ) {
+			case KEY_UP:
+				move = -1;
+				break;
+			case KEY_DOWN:
+				move = +1;
+				break;
+			case KEY_PPAGE:
+				move = ( widget.first_visible -
+					 widget.current - 1 );
+				break;
+			case KEY_NPAGE:
+				move = ( widget.first_visible - widget.current
+					 + SETTINGS_LIST_ROWS );
+				break;
+			case KEY_HOME:
+				move = -widget.num_rows;
+				break;
+			case KEY_END:
+				move = +widget.num_rows;
+				break;
+			case CTRL_D:
+				if ( ! widget.row.setting.name )
+					break;
+				if ( ( rc = delete_setting ( widget.settings,
+						&widget.row.setting ) ) != 0 ) {
+					alert ( " %s ", strerror ( rc ) );
+				}
+				select_setting_row ( &widget, widget.current );
+				redraw = 1;
+				break;
+			case CTRL_X:
+				return 0;
+			case CR:
+			case LF:
+				if ( widget.row.settings ) {
+					init_widget ( &widget,
+						      widget.row.settings );
+					redraw = 1;
+				}
+				/* Fall through */
+			default:
+				if ( widget.row.setting.name ) {
+					edit_setting ( &widget, key );
+					redraw = 1;
+				}
+				break;
+			}
+			if ( move ) {
+				next = ( widget.current + move );
+				if ( ( int ) next < 0 )
+					next = 0;
+				if ( next >= widget.num_rows )
+					next = ( widget.num_rows - 1 );
+				if ( next != widget.current ) {
+					draw_setting_row ( &widget );
+					redraw = 1;
+					reveal_setting_row ( &widget, next );
+					select_setting_row ( &widget, next );
+				}
+			}
+		}
+	}
+}
+
+int settings_ui ( struct settings *settings ) {
+	int rc;
+
+	initscr();
+	start_color();
+	color_set ( CPAIR_NORMAL, NULL );
+	curs_set ( 0 );
+	erase();
+	
+	rc = main_loop ( settings );
+
+	endwin();
+
+	return rc;
+}