src/drivers/framebuffer/framebuffer.c

/*
 * Copyright 2016 Google Inc.
 *
 * 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 <stdint.h>
#include <stdio.h>
#include <string.h>

#include "base/fwdb.h"
#include "drivers/framebuffer/framebuffer.h"

static const char framebuffer_fwdb_name[] = "framebuffer_info";

int framebuffer_read_from_fwdb(FrameBuffer *buf)
{
	FwdbEntry entry;
	if (fwdb_access(framebuffer_fwdb_name, &entry, NULL))
		return 1;

	if (entry.size < sizeof(FrameBufferHeader)) {
		printf("FWDB framebuffer too small.\n");
		return 1;
	}

	FrameBufferHeader *header = entry.ptr;

	if (header->version > FrameBufferCurrentVersion) {
		printf("Frame buffer version too new.\n");
		return 1;
	}

	if (entry.size != sizeof(FrameBuffer)) {
		printf("Frame buffer size mismatch.\n");
		return 1;
	}

	memcpy(buf, entry.ptr, sizeof(*buf));
	return 0;
}

int framebuffer_write_to_fwdb(FrameBuffer *buf)
{
	FwdbEntry entry = {
		.ptr = buf,
		.size = sizeof(*buf),
	};

	return fwdb_access(framebuffer_fwdb_name, NULL, &entry);
}