Add support for serial and null console to UEFI boot loader.

sys/boot/amd64/efi/bootinfo.c

@@ -60,6 +60,7 @@ bi_getboothowto(char *kargs)
 {
 	const char *sw;
 	char *opts;
+	char *console;
 	int howto, i;
 
 	howto = 0;
@@ -70,6 +71,14 @@ bi_getboothowto(char *kargs)
 			howto |= howto_names[i].mask;
 	}
 
+	console = getenv("console");
+	if (console != NULL) {
+		if (strcmp(console, "comconsole") == 0)
+			howto |= RB_SERIAL;
+		if (strcmp(console, "nullconsole") == 0)
+			howto |= RB_MUTE;
+	}
+
 	/* Parse kargs */
 	if (kargs == NULL)
 		return (howto);

sys/boot/amd64/efi/conf.c

@@ -62,8 +62,12 @@ struct file_format *file_formats[] = {
 };
 
 extern struct console efi_console;
+extern struct console comconsole;
+extern struct console nullconsole;
 
 struct console *consoles[] = {
 	&efi_console,
+	&comconsole,
+	&nullconsole,
 	NULL
 };

sys/boot/efi/libefi/Makefile

@@ -5,6 +5,8 @@ INTERNALLIB=
 
 SRCS=	delay.c efi_console.c efinet.c efipart.c errno.c handles.c \
 	libefi.c time.c
+.PATH:	${.CURDIR}/../../i386/libi386
+SRCS+= nullconsole.c comconsole.c
 
 .if ${MACHINE_ARCH} == "amd64"
 CFLAGS+= -fPIC
@@ -16,6 +18,8 @@ CFLAGS+= -I${.CURDIR}/../../../../lib/libstand
 # Pick up the bootstrap header for some interface items
 CFLAGS+= -I${.CURDIR}/../../common
 
+CFLAGS+= -DNO_PCI
+
  
 # Suppress warning from clang for FreeBSD %b and %D formats
 CFLAGS+= -fformat-extensions

sys/boot/i386/libi386/comconsole.c

@@ -214,6 +214,9 @@ comc_port_set(struct env_var *ev, int flags, const void *value)
 static uint32_t
 comc_parse_pcidev(const char *string)
 {
+#ifdef NO_PCI
+	return (0);
+#else
 	char *p, *p1;
 	uint8_t bus, dev, func, bar;
 	uint32_t locator;
@@ -247,11 +250,15 @@ comc_parse_pcidev(const char *string)
 
 	locator = (bar << 16) | biospci_locator(bus, dev, func);
 	return (locator);
+#endif
 }
 
 static int
 comc_pcidev_handle(uint32_t locator)
 {
+#ifdef NO_PCI
+	return (CMD_ERROR);
+#else
 	char intbuf[64];
 	uint32_t port;
 
@@ -275,6 +282,7 @@ comc_pcidev_handle(uint32_t locator)
 	comc_locator = locator;
 
 	return (CMD_OK);
+#endif
 }
 
 static int