loader: use teken teminal emulator for x86 and uefi

Replace mini cons25 emulator with teken, this does enable us proper console
terminal for loader and will make it possible to implement different
back end callbacks to draw to screen.

At this time we still only "draw" in text mode.

stand/defs.mk

@@ -180,6 +180,13 @@ CFLAGS+=-I.
 
 all: ${PROG}
 
+CLEANFILES+= teken_state.h
+teken.c: teken_state.h
+
+teken_state.h: ${SYSDIR}/teken/sequences
+	awk -f ${SYSDIR}/teken/gensequences \
+		${SYSDIR}/teken/sequences > teken_state.h
+
 .if !defined(NO_OBJ)
 _ILINKS=machine
 .if ${MACHINE} != ${MACHINE_CPUARCH} && ${MACHINE} != "arm64"

stand/efi/include/efilib.h

@@ -106,6 +106,7 @@ EFI_STATUS errno_to_efi_status(int errno);
 void efi_time_init(void);
 void efi_time_fini(void);
 
+bool efi_cons_update_mode(void);
 EFI_STATUS efi_main(EFI_HANDLE Ximage, EFI_SYSTEM_TABLE* Xsystab);
 
 EFI_STATUS main(int argc, CHAR16 *argv[]);

stand/efi/libefi/Makefile

@@ -22,6 +22,9 @@ SRCS=	delay.c \
 	libefi.c \
 	wchar.c
 
+.PATH:  ${SYSDIR}/teken
+SRCS+=  teken.c
+
 .if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
 SRCS+=	time.c
 .elif ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "arm"
@@ -45,6 +48,8 @@ CFLAGS+= -fPIC -mno-red-zone
 .endif
 CFLAGS+= -I${EFIINC}
 CFLAGS+= -I${EFIINCMD}
+CFLAGS.efi_console.c+= -I${SRCTOP}/sys/teken
+CFLAGS.teken.c+= -I${SRCTOP}/sys/teken
 .if ${MK_LOADER_ZFS} != "no"
 CFLAGS+=	-I${ZFSSRC}
 CFLAGS+=	-DEFI_ZFS_BOOT
@@ -56,9 +61,4 @@ CFLAGS+= -I${LDRSRC}
 # Handle FreeBSD specific %b and %D printf format specifiers
 CFLAGS+= ${FORMAT_EXTENSIONS}
 
-# Do not use TERM_EMU on arm and arm64 as it doesn't behave well with serial console
-.if ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "aarch64"
-CFLAGS+= -DTERM_EMU
-.endif
-
 .include <bsd.lib.mk>