coreboot: Add support for CBMEM console

coreboot supports an in-memory console to store firmware logs even when
no serial console is available. It is widely supported by
coreboot-compatible bootloaders (including SeaBIOS and GRUB) and can be
read by the Linux kernel.

This patch allows BL31 to add its own log messages to this console. The
driver will be registered automatically if coreboot support is compiled
in and detects the presence of a console buffer in the coreboot tables.

Change-Id: I31254dfa0c2fdeb7454634134b5707b4b4154907
Signed-off-by: Julius Werner <jwerner@chromium.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/drivers/coreboot/cbmem_console.h b/include/drivers/coreboot/cbmem_console.h
new file mode 100644
index 000000000..4fca36f61
--- /dev/null
+++ b/include/drivers/coreboot/cbmem_console.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CBMEM_CONSOLE_H__
+#define __CBMEM_CONSOLE_H__
+
+#include <console.h>
+
+#define CONSOLE_T_CBMC_BASE	CONSOLE_T_DRVDATA
+#define CONSOLE_T_CBMC_SIZE	(CONSOLE_T_DRVDATA + REGSZ)
+
+#ifndef __ASSEMBLER__
+
+typedef struct {
+	console_t console;
+	uintptr_t base;
+	uint32_t size;
+} console_cbmc_t;
+
+int console_cbmc_register(uintptr_t base, console_cbmc_t *console);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* __CBMEM_CONSOLE_H__ */