src/module/netboot.c

/*
 * Copyright 2013 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vboot_nvstorage.h>
#include <vboot_api.h>

#include "base/init_funcs.h"
#include "base/power.h"
#include "drivers/board/board.h"
#include "drivers/console/display.h"
#include "drivers/keyboard/keyboard.h"
#include "drivers/net/net.h"
#include "drivers/timer/timer.h"
#include "module/module.h"
#include "net/gigaboot/gigaboot.h"
#include "net/netboot/netboot.h"
#include "net/netboot/params.h"
#include "vboot/vbnv.h"

GigabootBuffer *gigaboot_get_buffer(const char *name, size_t size)
{
	static GigabootBuffer kernel = {
		.data = (void *)(uintptr_t)CONFIG_KERNEL_START,
		.size = CONFIG_KERNEL_SIZE,
	};

	static char cmdline_buf[4096];
	static GigabootBuffer cmdline = {
		.data = cmdline_buf,
		.size = sizeof(cmdline_buf),
	};

	if (!strcmp(name, gigaboot_buffer_kernel))
		return &kernel;
	if (!strcmp(name, gigaboot_buffer_cmdline))
		return &cmdline;
	return NULL;
}

static void enable_graphics(void)
{
	if (CONFIG_DRIVER_CONSOLE_DISPLAY)
		display_console_attach();

	if (!CONFIG_OPROM_MATTERS)
		return;

	// Manipulating vboot's internal data and calling its internal
	// functions is NOT NICE and will give you athlete's foot and make
	// you unpopular at parties. Right now it's the only way to ensure
	// graphics are enabled, though, so it's a necessary evil.
	if (!board_flag_option_roms_loaded()) {
		printf("Enabling graphics.\n");

		vbnv_write(VBNV_OPROM_NEEDED, 1);

		printf("Rebooting.\n");
		if (cold_reboot())
			halt();
	}
}

static char cmd_line[4096] = "lsm.module_locking=0 cros_netboot_ramfs "
			     "cros_factory_install cros_secure cros_netboot";

void module_main(void)
{
	// Make sure graphics are available if they aren't already.
	enable_graphics();

	srand(timer_raw_value());

	if (CONFIG_GIGABOOT)
		gigaboot();
	else
		netboot(cmd_line, sizeof(cmd_line));
}