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/*
* Copyright (C) 2019 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
#include <string.h>
#include <byteswap.h>
#include <ipxe/fdt.h>
#include <ipxe/init.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_table.h>
#include <ipxe/efi/efi_fdt.h>
#include <ipxe/efi/Guid/Fdt.h>
/** @file
*
* EFI Flattened Device Tree
*
*/
/** EFI Flattened Device Tree configuration table */
static struct fdt_header *efi_fdt;
EFI_USE_TABLE ( FDT_TABLE, &efi_fdt, 0 );
/**
* Initialise EFI Flattened Device Tree
*
*/
static void efi_fdt_init ( void ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
/* Do nothing if no configuration table is present */
if ( ! efi_fdt ) {
DBGC ( &efi_fdt, "EFIFDT has no configuration table\n" );
return;
}
DBGC ( &efi_fdt, "EFIFDT configuration table at %p\n", efi_fdt );
/* Parse as system device tree */
if ( ( rc = fdt_parse ( &sysfdt, efi_fdt, -1UL ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not parse: %s\n",
strerror ( rc ) );
return;
}
/* Create copy, since table may be removed at any time */
if ( ( efirc = bs->AllocatePool ( EfiBootServicesData, sysfdt.len,
&sysfdt.raw ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not create copy\n" );
sysfdt.len = 0;
return;
}
memcpy ( sysfdt.raw, efi_fdt, sysfdt.len );
}
/** EFI Flattened Device Tree initialisation function */
struct init_fn efi_fdt_init_fn __init_fn ( INIT_EARLY ) = {
.name = "efifdt",
.initialise = efi_fdt_init,
};
/**
* Determine length of EFI Flattened Device Tree
*
* @v data Configuration table data (presumed valid)
* @ret len Length of table
*/
static size_t efi_fdt_len ( const void *data ) {
const struct fdt_header *hdr = data;
return be32_to_cpu ( hdr->totalsize );
}
/** EFI Flattened Device Tree table type */
static struct efi_table efi_fdt_table = {
.guid = &efi_fdt_table_guid,
.len = efi_fdt_len,
};
/** EFI Flattened Device Tree table backup */
static void *efi_fdt_backup;
/** EFI Flattened Device Tree installed table */
static struct fdt_header *efi_fdt_installed;
/**
* Install EFI Flattened Device Tree table
*
* @v cmdline Command line, or NULL
* @ret rc Return status code
*/
int efi_fdt_install ( const char *cmdline ) {
int rc;
/* Create device tree */
if ( ( rc = fdt_create ( &efi_fdt_installed, cmdline, 0, 0 ) ) != 0 ) {
DBGC ( &efi_fdt, "EFI_FDT could not install: %s\n",
strerror ( rc ) );
goto err_create;
}
/* Install table */
if ( ( rc = efi_install_table ( &efi_fdt_table, efi_fdt_installed,
&efi_fdt_backup ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not install: %s\n",
strerror ( rc ) );
goto err_install;
}
return 0;
efi_uninstall_table ( &efi_fdt_table, &efi_fdt_backup );
err_install:
fdt_remove ( efi_fdt_installed );
err_create:
return rc;
}
/**
* Uninstall EFI Flattened Device Tree table
*
* @ret rc Return status code
*/
int efi_fdt_uninstall ( void ) {
int rc;
/* Uninstall table */
if ( ( rc = efi_uninstall_table ( &efi_fdt_table,
&efi_fdt_backup ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not %sinstall: %s\n",
( efi_fdt_backup ? "re" : "un" ), strerror ( rc ) );
/* Leak memory: there is nothing else we can do */
return rc;
}
/* Remove table */
fdt_remove ( efi_fdt_installed );
return 0;
}
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