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+/*
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+ * Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of the
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+ * License, or any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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+#include <string.h>
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+#include <gpxe/dhcp.h>
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+#include <gpxe/netdevice.h>
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+#include <undipreload.h>
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+#include <pxeparent.h>
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+#include <realmode.h>
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+#include <pxe_api.h>
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+
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+/**
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+ * Present cached DHCP packet if it exists
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+ */
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+void __weak_impl ( get_cached_dhcpack ) ( void ) {
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+ struct undi_device *undi;
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+ struct s_PXENV_GET_CACHED_INFO get_cached_info;
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+ int rc;
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+
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+ /* Use preloaded UNDI device to get at PXE entry point */
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+ undi = &preloaded_undi;
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+ if ( ! undi->entry.segment ) {
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+ DBG ( "PXEDHCP no preloaded UNDI device found\n" );
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+ return;
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+ }
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+
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+ /* Check that stack is available to get cached info */
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+ if ( ! ( undi->flags & UNDI_FL_KEEP_ALL ) ) {
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+ DBG ( "PXEDHCP stack was unloaded, no cache available\n" );
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+ return;
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+ }
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+
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+ /* Obtain cached DHCP packet */
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+ memset ( &get_cached_info, 0, sizeof ( get_cached_info ) );
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+ get_cached_info.PacketType = PXENV_PACKET_TYPE_DHCP_ACK;
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+
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+ if ( ( rc = pxeparent_call ( undi->entry, PXENV_GET_CACHED_INFO,
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+ &get_cached_info,
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+ sizeof ( get_cached_info ) ) ) != 0 ) {
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+ DBG ( "PXEDHCP GET_CACHED_INFO failed: %s\n", strerror ( rc ) );
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+ return;
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+ }
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+
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+ DBG ( "PXEDHCP got cached info at %04x:%04x length %d\n",
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+ get_cached_info.Buffer.segment, get_cached_info.Buffer.offset,
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+ get_cached_info.BufferSize );
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+
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+ /* Present cached DHCP packet */
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+ store_cached_dhcpack ( real_to_user ( get_cached_info.Buffer.segment,
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+ get_cached_info.Buffer.offset ),
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+ get_cached_info.BufferSize );
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+}
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