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[efi] Move abstract device path and handle functions to efi_utils.c

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-08-06 13:52:41 +01:00
parent 2ce1c70166
commit 2bf428c2a9
8 changed files with 131 additions and 85 deletions
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102
src/interface/efi/efi_utils.c Normal file
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/*
* Copyright (C) 2011 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 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_utils.h>
/** @file
*
* EFI utilities
*
*/
/**
* Find end of device path
*
* @v path Path to device
* @ret path_end End of device path
*/
EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
while ( path->Type != END_DEVICE_PATH_TYPE ) {
path = ( ( ( void * ) path ) +
/* There's this amazing new-fangled thing known as
* a UINT16, but who wants to use one of those? */
( ( path->Length[1] << 8 ) | path->Length[0] ) );
}
return path;
}
/**
* Add EFI device as child of another EFI device
*
* @v parent EFI parent device handle
* @v child EFI child device handle
* @ret rc Return status code
*/
int efi_child_add ( EFI_HANDLE parent, EFI_HANDLE child ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
void *devpath;
EFI_STATUS efirc;
int rc;
/* Re-open the device path protocol */
if ( ( efirc = bs->OpenProtocol ( parent,
&efi_device_path_protocol_guid,
&devpath,
efi_image_handle, child,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( parent, "EFIDEV %p %s could not add child",
parent, efi_handle_name ( parent ) );
DBGC ( parent, " %p %s: %s\n", child,
efi_handle_name ( child ), strerror ( rc ) );
DBGC_EFI_OPENERS ( parent, parent,
&efi_device_path_protocol_guid );
return rc;
}
DBGC2 ( parent, "EFIDEV %p %s added child",
parent, efi_handle_name ( parent ) );
DBGC2 ( parent, " %p %s\n", child, efi_handle_name ( child ) );
return 0;
}
/**
* Remove EFI device as child of another EFI device
*
* @v parent EFI parent device handle
* @v child EFI child device handle
*/
void efi_child_del ( EFI_HANDLE parent, EFI_HANDLE child ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
bs->CloseProtocol ( parent, &efi_device_path_protocol_guid,
efi_image_handle, child );
DBGC2 ( parent, "EFIDEV %p %s removed child",
parent, efi_handle_name ( parent ) );
DBGC2 ( parent, " %p %s\n",
child, efi_handle_name ( child ) );
}