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[int13] Add infrastructure to support EDD version 4.0

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Support the extensions mandated by EDD 4.0, including:

 o  the ability to specify a flat physical address in a disk address
    packet,

 o  the ability to specify a sector count greater than 127 in a disk
    address packet,

 o  support for all functions within the Fixed Disk Access and EDD
    Support subsets,

 o  the ability to describe a device using EDD Device Path Information.

This implementation is based on draft revision 3 of the EDD 4.0
specification, with reference to the EDD 3.0 specification.  It is
possible that this implementation may need to change in order to
conform to the final published EDD 4.0 specification.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-09-22 00:12:23 +01:00
parent adbe63860a
commit 3c35ae2f3b
7 changed files with 527 additions and 30 deletions
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27
src/core/device.c
View File

@@ -21,8 +21,9 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <ipxe/list.h>
#include <ipxe/tables.h>
#include <ipxe/device.h>
#include <ipxe/init.h>
#include <ipxe/interface.h>
#include <ipxe/device.h>
/**
* @file
@@ -105,3 +106,27 @@ struct startup_fn startup_devices __startup_fn ( STARTUP_NORMAL ) = {
.startup = probe_devices,
.shutdown = remove_devices,
};
/**
* Identify a device behind an interface
*
* @v intf Interface
* @ret device Device, or NULL
*/
struct device * identify_device ( struct interface *intf ) {
struct interface *dest;
identify_device_TYPE ( void * ) *op =
intf_get_dest_op ( intf, identify_device, &dest );
void *object = intf_object ( dest );
void *device;
if ( op ) {
device = op ( object );
} else {
/* Default is to return NULL */
device = NULL;
}
intf_put ( dest );
return device;
}

56
src/core/edd.c Normal file
View File

@@ -0,0 +1,56 @@
/*
* Copyright (C) 2010 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
#include <ipxe/interface.h>
#include <ipxe/edd.h>
/** @file
*
* Enhanced Disk Drive specification
*
*/
/**
* Describe a disk device using EDD
*
* @v intf Interface
* @v type EDD interface type
* @v path EDD device path
* @ret rc Return status code
*/
int edd_describe ( struct interface *intf, struct edd_interface_type *type,
union edd_device_path *path ) {
struct interface *dest;
edd_describe_TYPE ( void * ) *op =
intf_get_dest_op ( intf, edd_describe, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, type, path );
} else {
/* Default is to not support this operation */
rc = -ENOTSUP;
}
intf_put ( dest );
return rc;
}