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>

1 files changed, 53 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/cbmem_console.c b/payloads/libpayload/drivers/cbmem_console.c
new file mode 100644
index 0000000000..d4f01bf25a
--- /dev/null
+++ b/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;
+}