src/drivers/console/cbmem.c

/*
 * Copyright (c) 2012 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdint.h>
#include <stdlib.h>

#include "base/coreboot/sysinfo.h"
#include "base/fwdb.h"
#include "base/init_funcs.h"
#include "drivers/console/cbmem.h"
#include "drivers/console/console.h"

typedef struct {
	Console console;
	CbmemConsoleBuffer *buf;
} CbmemConsole;

static int cbmem_console_init(CbmemConsole *console)
{
	FwdbEntry default_entry = {
		.size = offsetof(CbmemConsoleBuffer, body) +
			CONFIG_DRIVER_CONSOLE_CBMEM_SIZE,
	};
	FwdbEntry entry;
	if (fwdb_access("cbmem console", &entry, &default_entry))
		return 1;
	CbmemConsoleBuffer *buf = entry.ptr;

	if (!buf->size)
		buf->size = CONFIG_DRIVER_CONSOLE_CBMEM_SIZE;

	console->buf = buf;

	return 0;
}

static void cbmem_console_write(ConsoleOutputOps *me,
				const void *buffer, size_t count)
{
	CbmemConsole *cbmem = container_of(me, CbmemConsole, console.output);
	if (!cbmem->buf && cbmem_console_init(cbmem))
		return;

	if (cbmem->buf->cursor + count >= cbmem->buf->size)
		return;

	memcpy(cbmem->buf->body + cbmem->buf->cursor, buffer, count);
	cbmem->buf->cursor += count;
}

static int cbmem_console_setup(void)
{
	static CbmemConsole console = {
		.console = {
			.output = {
				.write = &cbmem_console_write
			},
		},
	};
	list_insert_after(&console.console.list_node, &console_list);
	return 0;
}

INIT_FUNC_CONSOLE(cbmem_console_setup)