menu: add support for client defined statusline function

Currently displaying status line is done in a weak function
menu_display_statusline().

bootmenu.c overrides the weak default function.
It calls menu_default_choice() and interprets the data as
struct bootmenu_entry.

pxe boot also uses common menu code for pxe menus.
If there is a system that enables both bootmenu and pxe,
menu_display_statusline() defined in bootmenu.c will be called
and it will interpret struct pxe_label as struct bootmenu_entry.
This leads to data aborts and pxe menu corruptions.

This patch adds support for client defined statusline function
to resolve the above bug.

Signed-off-by: Thirupathaiah Annapureddy <thiruan@linux.microsoft.com>

cmd/bootmenu.c

@@ -365,6 +365,34 @@ cleanup:
 	return NULL;
 }
 
+static void menu_display_statusline(struct menu *m)
+{
+	struct bootmenu_entry *entry;
+	struct bootmenu_data *menu;
+
+	if (menu_default_choice(m, (void *)&entry) < 0)
+		return;
+
+	menu = entry->menu;
+
+	printf(ANSI_CURSOR_POSITION, 1, 1);
+	puts(ANSI_CLEAR_LINE);
+	printf(ANSI_CURSOR_POSITION, 2, 1);
+	puts("  *** U-Boot Boot Menu ***");
+	puts(ANSI_CLEAR_LINE_TO_END);
+	printf(ANSI_CURSOR_POSITION, 3, 1);
+	puts(ANSI_CLEAR_LINE);
+
+	/* First 3 lines are bootmenu header + 2 empty lines between entries */
+	printf(ANSI_CURSOR_POSITION, menu->count + 5, 1);
+	puts(ANSI_CLEAR_LINE);
+	printf(ANSI_CURSOR_POSITION, menu->count + 6, 1);
+	puts("  Press UP/DOWN to move, ENTER to select");
+	puts(ANSI_CLEAR_LINE_TO_END);
+	printf(ANSI_CURSOR_POSITION, menu->count + 7, 1);
+	puts(ANSI_CLEAR_LINE);
+}
+
 static void bootmenu_show(int delay)
 {
 	int init = 0;
@@ -396,8 +424,9 @@ static void bootmenu_show(int delay)
 	if (!bootmenu)
 		return;
 
-	menu = menu_create(NULL, bootmenu->delay, 1, bootmenu_print_entry,
+	menu = menu_create(NULL, bootmenu->delay, 1, menu_display_statusline,
-			   bootmenu_choice_entry, bootmenu);
+			   bootmenu_print_entry, bootmenu_choice_entry,
+			   bootmenu);
 	if (!menu) {
 		bootmenu_destroy(bootmenu);
 		return;
@@ -445,34 +474,6 @@ cleanup:
 #endif
 }
 
-void menu_display_statusline(struct menu *m)
-{
-	struct bootmenu_entry *entry;
-	struct bootmenu_data *menu;
-
-	if (menu_default_choice(m, (void *)&entry) < 0)
-		return;
-
-	menu = entry->menu;
-
-	printf(ANSI_CURSOR_POSITION, 1, 1);
-	puts(ANSI_CLEAR_LINE);
-	printf(ANSI_CURSOR_POSITION, 2, 1);
-	puts("  *** U-Boot Boot Menu ***");
-	puts(ANSI_CLEAR_LINE_TO_END);
-	printf(ANSI_CURSOR_POSITION, 3, 1);
-	puts(ANSI_CLEAR_LINE);
-
-	/* First 3 lines are bootmenu header + 2 empty lines between entries */
-	printf(ANSI_CURSOR_POSITION, menu->count + 5, 1);
-	puts(ANSI_CLEAR_LINE);
-	printf(ANSI_CURSOR_POSITION, menu->count + 6, 1);
-	puts("  Press UP/DOWN to move, ENTER to select");
-	puts(ANSI_CLEAR_LINE_TO_END);
-	printf(ANSI_CURSOR_POSITION, menu->count + 7, 1);
-	puts(ANSI_CLEAR_LINE);
-}
-
 #ifdef CONFIG_AUTOBOOT_MENU_SHOW
 int menu_show(int bootdelay)
 {

cmd/pxe_utils.c

@@ -1237,7 +1237,7 @@ static struct menu *pxe_menu_to_menu(struct pxe_menu *cfg)
 	 * Create a menu and add items for all the labels.
 	 */
 	m = menu_create(cfg->title, DIV_ROUND_UP(cfg->timeout, 10),
-			cfg->prompt, label_print, NULL, NULL);
+			cfg->prompt, NULL, label_print, NULL, NULL);
 
 	if (!m)
 		return NULL;

common/menu.c

@@ -36,6 +36,7 @@ struct menu {
 	int timeout;
 	char *title;
 	int prompt;
+	void (*display_statusline)(struct menu *);
 	void (*item_data_print)(void *);
 	char *(*item_choice)(void *);
 	void *item_choice_data;
@@ -106,10 +107,6 @@ static inline void *menu_item_destroy(struct menu *m,
 	return NULL;
 }
 
-__weak void menu_display_statusline(struct menu *m)
-{
-}
-
 /*
  * Display a menu so the user can make a choice of an item. First display its
  * title, if any, and then each item in the menu.
@@ -120,7 +117,8 @@ static inline void menu_display(struct menu *m)
 		puts(m->title);
 		putc('\n');
 	}
-	menu_display_statusline(m);
+	if (m->display_statusline)
+		m->display_statusline(m);
 
 	menu_items_iter(m, menu_item_print, NULL);
 }
@@ -344,6 +342,9 @@ int menu_item_add(struct menu *m, char *item_key, void *item_data)
  * timeout. If 1, the user will be prompted for input regardless of the value
  * of timeout.
  *
+ * display_statusline - If not NULL, will be called to show a statusline when
+ * the menu is displayed.
+ *
  * item_data_print - If not NULL, will be called for each item when the menu
  * is displayed, with the pointer to the item's data passed as the argument.
  * If NULL, each item's key will be printed instead.  Since an item's key is
@@ -360,6 +361,7 @@ int menu_item_add(struct menu *m, char *item_key, void *item_data)
  * insufficient memory available to create the menu.
  */
 struct menu *menu_create(char *title, int timeout, int prompt,
+				void (*display_statusline)(struct menu *),
 				void (*item_data_print)(void *),
 				char *(*item_choice)(void *),
 				void *item_choice_data)
@@ -374,6 +376,7 @@ struct menu *menu_create(char *title, int timeout, int prompt,
 	m->default_item = NULL;
 	m->prompt = prompt;
 	m->timeout = timeout;
+	m->display_statusline = display_statusline;
 	m->item_data_print = item_data_print;
 	m->item_choice = item_choice;
 	m->item_choice_data = item_choice_data;

include/menu.h

@@ -9,6 +9,7 @@
 struct menu;
 
 struct menu *menu_create(char *title, int timeout, int prompt,
+				void (*display_statusline)(struct menu *),
 				void (*item_data_print)(void *),
 				char *(*item_choice)(void *),
 				void *item_choice_data);
@@ -16,7 +17,6 @@ int menu_default_set(struct menu *m, char *item_key);
 int menu_get_choice(struct menu *m, void **choice);
 int menu_item_add(struct menu *m, char *item_key, void *item_data);
 int menu_destroy(struct menu *m);
-void menu_display_statusline(struct menu *m);
 int menu_default_choice(struct menu *m, void **choice);
 
 /**