src/module/uefi/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 "drivers/net/net.h"
#include "drivers/timer/timer.h"
#include "module/module.h"
#include "module/uefi/fwdb.h"
#include "net/gigaboot/gigaboot.h"
#include "net/netboot/netboot.h"
#include "net/netboot/params.h"


void *gigaboot_allocate_buffer(size_t *size)
{
	static const size_t PageSize = 4096;

	EFI_SYSTEM_TABLE *st = uefi_system_table_ptr();
	if (!st)
		return NULL;
	EFI_BOOT_SERVICES *bs = st->BootServices;

	*size = (*size + PageSize - 1) & ~(PageSize - 1);

	EFI_PHYSICAL_ADDRESS data = (EFI_PHYSICAL_ADDRESS)0xffffffff;
	if (bs->AllocatePages(AllocateMaxAddress, EfiLoaderData,
			      *size / PageSize, &data)) {
		printf("Failed to allocate gigaboot buffer of size %d.\n",
			(int)(*size / PageSize));
		halt();
		return NULL;
	}

	return (void *)(uintptr_t)data;
}

int gigaboot_free_buffer(void *data, size_t size)
{
	if (!data)
		return 0;

	static const size_t PageSize = 4096;

	EFI_SYSTEM_TABLE *st = uefi_system_table_ptr();
	if (!st)
		return 1;
	EFI_BOOT_SERVICES *bs = st->BootServices;

	EFI_PHYSICAL_ADDRESS addr = (EFI_PHYSICAL_ADDRESS)(uintptr_t)data;
	if (bs->FreePages(addr, size / PageSize)) {
		printf("Could not free previous gigaboot buffer.\n");
		return 1;
	}
	return 0;
}

void module_main(void)
{
	static char cmd_line[4096];

	srand(timer_raw_value());

	if (uefi_prepare_fwdb_file(L"depthcharge\\netboot_params",
				   "netboot_params") ||
	    uefi_prepare_fwdb_e820_map() ||
	    uefi_prepare_fwdb_acpi_rsdp()) {
		halt();
	}

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