[console] Generalise bios_keymap() as key_remap()

Allow the keyboard remapping functionality to be exposed to consoles
other than the BIOS console.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/interface/pcbios/bios_console.c

@@ -339,22 +339,6 @@ static const char * bios_ansi_seq ( unsigned int scancode ) {
 	return NULL;
 }
 
-/**
- * Map a key
- *
- * @v character		Character read from console
- * @ret character	Mapped character
- */
-static int bios_keymap ( unsigned int character ) {
-	struct key_mapping *mapping;
-
-	for_each_table_entry ( mapping, KEYMAP ) {
-		if ( mapping->from == character )
-			return mapping->to;
-	}
-	return character;
-}
-
 /**
  * Get character from BIOS console
  *
@@ -387,7 +371,7 @@ static int bios_getchar ( void ) {
 
 	/* If it's a normal character, just map and return it */
 	if ( character && ( character < 0x80 ) )
-		return bios_keymap ( character );
+		return key_remap ( character );
 
 	/* Otherwise, check for a special key that we know about */
 	if ( ( ansi_seq = bios_ansi_seq ( keypress >> 8 ) ) ) {

src/core/keymap.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2022 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.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <ipxe/keymap.h>
+
+/** @file
+ *
+ * Keyboard mappings
+ *
+ */
+
+/**
+ * Remap a key
+ *
+ * @v character		Character read from console
+ * @ret character	Mapped character
+ */
+unsigned int key_remap ( unsigned int character ) {
+	struct key_mapping *mapping;
+
+	/* Remap via table */
+	for_each_table_entry ( mapping, KEYMAP ) {
+		if ( mapping->from == character ) {
+			character = mapping->to;
+			break;
+		}
+	}
+
+	return character;
+}

src/include/ipxe/keymap.h

@@ -27,4 +27,6 @@ struct key_mapping {
 /** Define a keyboard mapping */
 #define __keymap __table_entry ( KEYMAP, 01 )
 
+extern unsigned int key_remap ( unsigned int character );
+
 #endif /* _IPXE_KEYMAP_H */