libpayload: Add support for the CBMEM in memory console.

Change-Id: I1489b5306ef1ca078686fed4dba2d242f70ad941
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: http://review.coreboot.org/1727
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

payloads/libpayload/Config.in

@@ -147,6 +147,10 @@ endmenu
 
 menu "Console Options"
 
+config CBMEM_CONSOLE
+	bool "Send output to the in memory CBMEM console"
+	default y
+
 config SERIAL_CONSOLE
 	bool "See output on the serial port console"
 	default y

payloads/libpayload/configs/defconfig

@@ -32,6 +32,7 @@ CONFIG_LZMA=y
 #
 # Console Options
 #
+CONFIG_CBMEM_CONSOLE=y
 CONFIG_SERIAL_CONSOLE=y
 CONFIG_SERIAL_IOBASE=0x3f8
 # CONFIG_SERIAL_SET_SPEED is not set

payloads/libpayload/drivers/Makefile.inc

@@ -37,6 +37,8 @@ libc-$(CONFIG_SERIAL_CONSOLE) += serial.c
 
 libc-$(CONFIG_PC_KEYBOARD) += keyboard.c
 
+libc-$(CONFIG_CBMEM_CONSOLE) += cbmem_console.c
+
 libc-$(CONFIG_NVRAM) += nvram.c
 libc-$(CONFIG_NVRAM) += options.c
 

payloads/libpayload/drivers/cbmem_console.c

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 (at your option) 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <libpayload.h>
+#include <stdint.h>
+
+struct cbmem_console {
+	uint32_t size;
+	uint32_t cursor;
+	uint8_t body[0];
+} __attribute__ ((__packed__));
+
+static struct cbmem_console *cbmem_console_p;
+
+static struct console_output_driver cbmem_console_driver =
+{
+	.putchar = &cbmem_console_putc
+};
+
+void cbmem_console_init(void)
+{
+	cbmem_console_p = lib_sysinfo.cbmem_cons;
+	if (cbmem_console_p)
+		console_add_output_driver(&cbmem_console_driver);
+}
+
+void cbmem_console_putc(unsigned int data)
+{
+	// Bail out if the buffer is full.
+	if (cbmem_console_p->cursor >= cbmem_console_p->size)
+		return;
+
+	cbmem_console_p->body[cbmem_console_p->cursor++] = data;
+}

payloads/libpayload/include/libpayload.h

@@ -201,6 +201,15 @@ void video_console_get_cursor(unsigned int *x, unsigned int *y, unsigned int *en
 void video_console_set_cursor(unsigned int cursorx, unsigned int cursory);
 /** @} */
 
+/**
+ * @defgroup cbmem_console CBMEM memory console.
+ * @ingroup input
+ * @{
+ */
+void cbmem_console_init(void);
+void cbmem_console_putc(unsigned int data);
+/** @} */
+
 /* drivers/option.c */
 struct nvram_accessor {
 	u8 (*read)(u8 reg);

payloads/libpayload/libc/console.c

@@ -57,6 +57,9 @@ void console_init(void)
 #ifdef CONFIG_PC_KEYBOARD
 	keyboard_init();
 #endif
+#ifdef CONFIG_CBMEM_CONSOLE
+	cbmem_console_init();
+#endif
 }
 
 static void device_putchar(unsigned char c)