632 lines
18 KiB
C
632 lines
18 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <pxe.h>
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#include <realmode.h>
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#include <pic8259.h>
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#include <biosint.h>
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#include <pnpbios.h>
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#include <basemem_packet.h>
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#include <gpxe/io.h>
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#include <gpxe/iobuf.h>
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#include <gpxe/netdevice.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/ethernet.h>
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#include <undi.h>
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#include <undinet.h>
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#include <pxeparent.h>
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/** @file
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*
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* UNDI network device driver
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*
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*/
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/** An UNDI NIC */
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struct undi_nic {
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/** Assigned IRQ number */
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unsigned int irq;
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/** Currently processing ISR */
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int isr_processing;
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/** Bug workarounds */
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int hacks;
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};
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/**
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* @defgroup undi_hacks UNDI workarounds
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* @{
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*/
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/** Work around Etherboot 5.4 bugs */
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#define UNDI_HACK_EB54 0x0001
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/** @} */
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static void undinet_close ( struct net_device *netdev );
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/** Address of UNDI entry point */
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static SEGOFF16_t undinet_entry;
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/*****************************************************************************
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*
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* UNDI interrupt service routine
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*
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*****************************************************************************
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*/
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/**
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* UNDI interrupt service routine
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*
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* The UNDI ISR increments a counter (@c trigger_count) and exits.
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*/
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extern void undiisr ( void );
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/** IRQ number */
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uint8_t __data16 ( undiisr_irq );
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#define undiisr_irq __use_data16 ( undiisr_irq )
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/** IRQ chain vector */
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struct segoff __data16 ( undiisr_next_handler );
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#define undiisr_next_handler __use_data16 ( undiisr_next_handler )
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/** IRQ trigger count */
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volatile uint8_t __data16 ( undiisr_trigger_count ) = 0;
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#define undiisr_trigger_count __use_data16 ( undiisr_trigger_count )
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/** Last observed trigger count */
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static unsigned int last_trigger_count = 0;
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/**
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* Hook UNDI interrupt service routine
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*
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* @v irq IRQ number
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*/
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static void undinet_hook_isr ( unsigned int irq ) {
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assert ( irq <= IRQ_MAX );
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assert ( undiisr_irq == 0 );
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undiisr_irq = irq;
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hook_bios_interrupt ( IRQ_INT ( irq ),
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( ( unsigned int ) undiisr ),
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&undiisr_next_handler );
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}
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/**
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* Unhook UNDI interrupt service routine
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*
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* @v irq IRQ number
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*/
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static void undinet_unhook_isr ( unsigned int irq ) {
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assert ( irq <= IRQ_MAX );
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unhook_bios_interrupt ( IRQ_INT ( irq ),
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( ( unsigned int ) undiisr ),
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&undiisr_next_handler );
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undiisr_irq = 0;
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}
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/**
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* Test to see if UNDI ISR has been triggered
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*
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* @ret triggered ISR has been triggered since last check
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*/
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static int undinet_isr_triggered ( void ) {
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unsigned int this_trigger_count;
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/* Read trigger_count. Do this only once; it is volatile */
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this_trigger_count = undiisr_trigger_count;
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if ( this_trigger_count == last_trigger_count ) {
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/* Not triggered */
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return 0;
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} else {
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/* Triggered */
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last_trigger_count = this_trigger_count;
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return 1;
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}
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}
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/*****************************************************************************
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*
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* UNDI network device interface
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*
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*****************************************************************************
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*/
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/** UNDI transmit buffer descriptor */
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static struct s_PXENV_UNDI_TBD __data16 ( undinet_tbd );
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#define undinet_tbd __use_data16 ( undinet_tbd )
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/**
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* Transmit packet
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*
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* @v netdev Network device
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* @v iobuf I/O buffer
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* @ret rc Return status code
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*/
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static int undinet_transmit ( struct net_device *netdev,
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struct io_buffer *iobuf ) {
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struct s_PXENV_UNDI_TRANSMIT undi_transmit;
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size_t len = iob_len ( iobuf );
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int rc;
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/* Technically, we ought to make sure that the previous
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* transmission has completed before we re-use the buffer.
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* However, many PXE stacks (including at least some Intel PXE
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* stacks and Etherboot 5.4) fail to generate TX completions.
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* In practice this won't be a problem, since our TX datapath
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* has a very low packet volume and we can get away with
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* assuming that a TX will be complete by the time we want to
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* transmit the next packet.
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*/
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/* Copy packet to UNDI I/O buffer */
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if ( len > sizeof ( basemem_packet ) )
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len = sizeof ( basemem_packet );
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memcpy ( &basemem_packet, iobuf->data, len );
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/* Create PXENV_UNDI_TRANSMIT data structure */
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memset ( &undi_transmit, 0, sizeof ( undi_transmit ) );
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undi_transmit.DestAddr.segment = rm_ds;
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undi_transmit.DestAddr.offset = __from_data16 ( &undinet_tbd );
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undi_transmit.TBD.segment = rm_ds;
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undi_transmit.TBD.offset = __from_data16 ( &undinet_tbd );
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/* Create PXENV_UNDI_TBD data structure */
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undinet_tbd.ImmedLength = len;
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undinet_tbd.Xmit.segment = rm_ds;
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undinet_tbd.Xmit.offset = __from_data16 ( basemem_packet );
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/* Issue PXE API call */
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if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_TRANSMIT,
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&undi_transmit,
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sizeof ( undi_transmit ) ) ) != 0 )
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goto done;
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/* Free I/O buffer */
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netdev_tx_complete ( netdev, iobuf );
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done:
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return rc;
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}
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/**
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* Poll for received packets
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*
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* @v netdev Network device
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*
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* Fun, fun, fun. UNDI drivers don't use polling; they use
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* interrupts. We therefore cheat and pretend that an interrupt has
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* occurred every time undinet_poll() is called. This isn't too much
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* of a hack; PCI devices share IRQs and so the first thing that a
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* proper ISR should do is call PXENV_UNDI_ISR to determine whether or
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* not the UNDI NIC generated the interrupt; there is no harm done by
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* spurious calls to PXENV_UNDI_ISR. Similarly, we wouldn't be
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* handling them any more rapidly than the usual rate of
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* undinet_poll() being called even if we did implement a full ISR.
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* So it should work. Ha!
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*
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* Addendum (21/10/03). Some cards don't play nicely with this trick,
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* so instead of doing it the easy way we have to go to all the hassle
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* of installing a genuine interrupt service routine and dealing with
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* the wonderful 8259 Programmable Interrupt Controller. Joy.
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*
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* Addendum (10/07/07). When doing things such as iSCSI boot, in
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* which we have to co-operate with a running OS, we can't get away
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* with the "ISR-just-increments-a-counter-and-returns" trick at all,
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* because it involves tying up the PIC for far too long, and other
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* interrupt-dependent components (e.g. local disks) start breaking.
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* We therefore implement a "proper" ISR which calls PXENV_UNDI_ISR
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* from within interrupt context in order to deassert the device
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* interrupt, and sends EOI if applicable.
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*/
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static void undinet_poll ( struct net_device *netdev ) {
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struct undi_nic *undinic = netdev->priv;
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struct s_PXENV_UNDI_ISR undi_isr;
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struct io_buffer *iobuf = NULL;
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size_t len;
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size_t frag_len;
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size_t max_frag_len;
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int rc;
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if ( ! undinic->isr_processing ) {
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/* Do nothing unless ISR has been triggered */
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if ( ! undinet_isr_triggered() ) {
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/* Allow interrupt to occur */
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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"nop\n\t"
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"nop\n\t"
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"cli\n\t" ) : : );
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return;
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}
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/* Start ISR processing */
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undinic->isr_processing = 1;
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undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_PROCESS;
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} else {
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/* Continue ISR processing */
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undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
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}
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/* Run through the ISR loop */
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while ( 1 ) {
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if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_ISR,
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&undi_isr,
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sizeof ( undi_isr ) ) ) != 0 )
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break;
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switch ( undi_isr.FuncFlag ) {
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case PXENV_UNDI_ISR_OUT_TRANSMIT:
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/* We don't care about transmit completions */
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break;
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case PXENV_UNDI_ISR_OUT_RECEIVE:
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/* Packet fragment received */
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len = undi_isr.FrameLength;
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frag_len = undi_isr.BufferLength;
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if ( ( len == 0 ) || ( len < frag_len ) ) {
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/* Don't laugh. VMWare does it. */
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DBGC ( undinic, "UNDINIC %p reported insane "
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"fragment (%zd of %zd bytes)\n",
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undinic, frag_len, len );
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netdev_rx_err ( netdev, NULL, -EINVAL );
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break;
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}
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if ( ! iobuf )
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iobuf = alloc_iob ( len );
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if ( ! iobuf ) {
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DBGC ( undinic, "UNDINIC %p could not "
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"allocate %zd bytes for RX buffer\n",
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undinic, len );
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/* Fragment will be dropped */
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netdev_rx_err ( netdev, NULL, -ENOMEM );
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goto done;
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}
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max_frag_len = iob_tailroom ( iobuf );
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if ( frag_len > max_frag_len ) {
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DBGC ( undinic, "UNDINIC %p fragment too big "
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"(%zd+%zd does not fit into %zd)\n",
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undinic, iob_len ( iobuf ), frag_len,
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( iob_len ( iobuf ) + max_frag_len ) );
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frag_len = max_frag_len;
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}
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copy_from_real ( iob_put ( iobuf, frag_len ),
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undi_isr.Frame.segment,
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undi_isr.Frame.offset, frag_len );
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if ( iob_len ( iobuf ) == len ) {
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/* Whole packet received; deliver it */
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netdev_rx ( netdev, iob_disown ( iobuf ) );
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/* Etherboot 5.4 fails to return all packets
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* under mild load; pretend it retriggered.
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*/
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if ( undinic->hacks & UNDI_HACK_EB54 )
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--last_trigger_count;
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}
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break;
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case PXENV_UNDI_ISR_OUT_DONE:
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/* Processing complete */
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undinic->isr_processing = 0;
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goto done;
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default:
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/* Should never happen. VMWare does it routinely. */
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DBGC ( undinic, "UNDINIC %p ISR returned invalid "
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"FuncFlag %04x\n", undinic, undi_isr.FuncFlag );
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undinic->isr_processing = 0;
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goto done;
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}
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undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
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}
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done:
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if ( iobuf ) {
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DBGC ( undinic, "UNDINIC %p returned incomplete packet "
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"(%zd of %zd)\n", undinic, iob_len ( iobuf ),
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( iob_len ( iobuf ) + iob_tailroom ( iobuf ) ) );
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netdev_rx_err ( netdev, iobuf, -EINVAL );
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}
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}
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/**
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* Open NIC
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*
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* @v netdev Net device
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* @ret rc Return status code
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*/
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static int undinet_open ( struct net_device *netdev ) {
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struct undi_nic *undinic = netdev->priv;
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struct s_PXENV_UNDI_SET_STATION_ADDRESS undi_set_address;
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struct s_PXENV_UNDI_OPEN undi_open;
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int rc;
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/* Hook interrupt service routine and enable interrupt */
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undinet_hook_isr ( undinic->irq );
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enable_irq ( undinic->irq );
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send_eoi ( undinic->irq );
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/* Set station address. Required for some PXE stacks; will
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* spuriously fail on others. Ignore failures. We only ever
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* use it to set the MAC address to the card's permanent value
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* anyway.
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*/
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memcpy ( undi_set_address.StationAddress, netdev->ll_addr,
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sizeof ( undi_set_address.StationAddress ) );
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pxeparent_call ( undinet_entry, PXENV_UNDI_SET_STATION_ADDRESS,
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&undi_set_address, sizeof ( undi_set_address ) );
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/* Open NIC. We ask for promiscuous operation, since it's the
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* only way to ask for all multicast addresses. On any
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* switched network, it shouldn't really make a difference to
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* performance.
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*/
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memset ( &undi_open, 0, sizeof ( undi_open ) );
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undi_open.PktFilter = ( FLTR_DIRECTED | FLTR_BRDCST | FLTR_PRMSCS );
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if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_OPEN,
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&undi_open, sizeof ( undi_open ) ) ) != 0 )
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goto err;
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DBGC ( undinic, "UNDINIC %p opened\n", undinic );
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return 0;
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err:
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undinet_close ( netdev );
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return rc;
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}
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/**
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* Close NIC
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*
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* @v netdev Net device
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*/
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static void undinet_close ( struct net_device *netdev ) {
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struct undi_nic *undinic = netdev->priv;
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struct s_PXENV_UNDI_ISR undi_isr;
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struct s_PXENV_UNDI_CLOSE undi_close;
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int rc;
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/* Ensure ISR has exited cleanly */
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while ( undinic->isr_processing ) {
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undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
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if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_ISR,
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&undi_isr,
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sizeof ( undi_isr ) ) ) != 0 )
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break;
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switch ( undi_isr.FuncFlag ) {
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case PXENV_UNDI_ISR_OUT_TRANSMIT:
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case PXENV_UNDI_ISR_OUT_RECEIVE:
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/* Continue draining */
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break;
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default:
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/* Stop processing */
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undinic->isr_processing = 0;
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break;
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}
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}
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/* Close NIC */
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pxeparent_call ( undinet_entry, PXENV_UNDI_CLOSE,
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&undi_close, sizeof ( undi_close ) );
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/* Disable interrupt and unhook ISR */
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disable_irq ( undinic->irq );
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undinet_unhook_isr ( undinic->irq );
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DBGC ( undinic, "UNDINIC %p closed\n", undinic );
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}
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/**
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* Enable/disable interrupts
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*
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* @v netdev Net device
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* @v enable Interrupts should be enabled
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*/
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static void undinet_irq ( struct net_device *netdev, int enable ) {
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struct undi_nic *undinic = netdev->priv;
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/* Cannot support interrupts yet */
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DBGC ( undinic, "UNDINIC %p cannot %s interrupts\n",
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undinic, ( enable ? "enable" : "disable" ) );
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}
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/** UNDI network device operations */
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static struct net_device_operations undinet_operations = {
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.open = undinet_open,
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.close = undinet_close,
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.transmit = undinet_transmit,
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.poll = undinet_poll,
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.irq = undinet_irq,
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};
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/**
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* Probe UNDI device
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*
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* @v undi UNDI device
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* @ret rc Return status code
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*/
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int undinet_probe ( struct undi_device *undi ) {
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struct net_device *netdev;
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struct undi_nic *undinic;
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struct s_PXENV_START_UNDI start_undi;
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struct s_PXENV_UNDI_STARTUP undi_startup;
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struct s_PXENV_UNDI_INITIALIZE undi_initialize;
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struct s_PXENV_UNDI_GET_INFORMATION undi_info;
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struct s_PXENV_UNDI_GET_IFACE_INFO undi_iface;
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struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
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struct s_PXENV_UNDI_CLEANUP undi_cleanup;
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struct s_PXENV_STOP_UNDI stop_undi;
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int rc;
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/* Allocate net device */
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netdev = alloc_etherdev ( sizeof ( *undinic ) );
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if ( ! netdev )
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return -ENOMEM;
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netdev_init ( netdev, &undinet_operations );
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undinic = netdev->priv;
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undi_set_drvdata ( undi, netdev );
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netdev->dev = &undi->dev;
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memset ( undinic, 0, sizeof ( *undinic ) );
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undinet_entry = undi->entry;
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DBGC ( undinic, "UNDINIC %p using UNDI %p\n", undinic, undi );
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/* Hook in UNDI stack */
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if ( ! ( undi->flags & UNDI_FL_STARTED ) ) {
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memset ( &start_undi, 0, sizeof ( start_undi ) );
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start_undi.AX = undi->pci_busdevfn;
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start_undi.BX = undi->isapnp_csn;
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start_undi.DX = undi->isapnp_read_port;
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start_undi.ES = BIOS_SEG;
|
|
start_undi.DI = find_pnp_bios();
|
|
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_START_UNDI,
|
|
&start_undi,
|
|
sizeof ( start_undi ) ) ) != 0 )
|
|
goto err_start_undi;
|
|
}
|
|
undi->flags |= UNDI_FL_STARTED;
|
|
|
|
/* Bring up UNDI stack */
|
|
if ( ! ( undi->flags & UNDI_FL_INITIALIZED ) ) {
|
|
memset ( &undi_startup, 0, sizeof ( undi_startup ) );
|
|
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_STARTUP,
|
|
&undi_startup,
|
|
sizeof ( undi_startup ) ) ) != 0 )
|
|
goto err_undi_startup;
|
|
memset ( &undi_initialize, 0, sizeof ( undi_initialize ) );
|
|
if ( ( rc = pxeparent_call ( undinet_entry,
|
|
PXENV_UNDI_INITIALIZE,
|
|
&undi_initialize,
|
|
sizeof ( undi_initialize ))) != 0 )
|
|
goto err_undi_initialize;
|
|
}
|
|
undi->flags |= UNDI_FL_INITIALIZED;
|
|
|
|
/* Get device information */
|
|
memset ( &undi_info, 0, sizeof ( undi_info ) );
|
|
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_GET_INFORMATION,
|
|
&undi_info, sizeof ( undi_info ) ) ) != 0 )
|
|
goto err_undi_get_information;
|
|
memcpy ( netdev->hw_addr, undi_info.PermNodeAddress, ETH_ALEN );
|
|
undinic->irq = undi_info.IntNumber;
|
|
if ( undinic->irq > IRQ_MAX ) {
|
|
DBGC ( undinic, "UNDINIC %p invalid IRQ %d\n",
|
|
undinic, undinic->irq );
|
|
goto err_bad_irq;
|
|
}
|
|
DBGC ( undinic, "UNDINIC %p is %s on IRQ %d\n",
|
|
undinic, eth_ntoa ( netdev->hw_addr ), undinic->irq );
|
|
|
|
/* Get interface information */
|
|
memset ( &undi_iface, 0, sizeof ( undi_iface ) );
|
|
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_GET_IFACE_INFO,
|
|
&undi_iface,
|
|
sizeof ( undi_iface ) ) ) != 0 )
|
|
goto err_undi_get_iface_info;
|
|
DBGC ( undinic, "UNDINIC %p has type %s, speed %d, flags %08x\n",
|
|
undinic, undi_iface.IfaceType, undi_iface.LinkSpeed,
|
|
undi_iface.ServiceFlags );
|
|
if ( strncmp ( ( ( char * ) undi_iface.IfaceType ), "Etherboot",
|
|
sizeof ( undi_iface.IfaceType ) ) == 0 ) {
|
|
DBGC ( undinic, "UNDINIC %p Etherboot 5.4 workaround enabled\n",
|
|
undinic );
|
|
undinic->hacks |= UNDI_HACK_EB54;
|
|
}
|
|
|
|
/* Mark as link up; we don't handle link state */
|
|
netdev_link_up ( netdev );
|
|
|
|
/* Register network device */
|
|
if ( ( rc = register_netdev ( netdev ) ) != 0 )
|
|
goto err_register;
|
|
|
|
DBGC ( undinic, "UNDINIC %p added\n", undinic );
|
|
return 0;
|
|
|
|
err_register:
|
|
err_undi_get_iface_info:
|
|
err_bad_irq:
|
|
err_undi_get_information:
|
|
err_undi_initialize:
|
|
/* Shut down UNDI stack */
|
|
memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
|
|
pxeparent_call ( undinet_entry, PXENV_UNDI_SHUTDOWN, &undi_shutdown,
|
|
sizeof ( undi_shutdown ) );
|
|
memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
|
|
pxeparent_call ( undinet_entry, PXENV_UNDI_CLEANUP, &undi_cleanup,
|
|
sizeof ( undi_cleanup ) );
|
|
undi->flags &= ~UNDI_FL_INITIALIZED;
|
|
err_undi_startup:
|
|
/* Unhook UNDI stack */
|
|
memset ( &stop_undi, 0, sizeof ( stop_undi ) );
|
|
pxeparent_call ( undinet_entry, PXENV_STOP_UNDI, &stop_undi,
|
|
sizeof ( stop_undi ) );
|
|
undi->flags &= ~UNDI_FL_STARTED;
|
|
err_start_undi:
|
|
netdev_nullify ( netdev );
|
|
netdev_put ( netdev );
|
|
undi_set_drvdata ( undi, NULL );
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Remove UNDI device
|
|
*
|
|
* @v undi UNDI device
|
|
*/
|
|
void undinet_remove ( struct undi_device *undi ) {
|
|
struct net_device *netdev = undi_get_drvdata ( undi );
|
|
struct undi_nic *undinic = netdev->priv;
|
|
struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
|
|
struct s_PXENV_UNDI_CLEANUP undi_cleanup;
|
|
struct s_PXENV_STOP_UNDI stop_undi;
|
|
|
|
/* Unregister net device */
|
|
unregister_netdev ( netdev );
|
|
|
|
/* If we are preparing for an OS boot, or if we cannot exit
|
|
* via the PXE stack, then shut down the PXE stack.
|
|
*/
|
|
if ( ! ( undi->flags & UNDI_FL_KEEP_ALL ) ) {
|
|
|
|
/* Shut down UNDI stack */
|
|
memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
|
|
pxeparent_call ( undinet_entry, PXENV_UNDI_SHUTDOWN,
|
|
&undi_shutdown, sizeof ( undi_shutdown ) );
|
|
memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
|
|
pxeparent_call ( undinet_entry, PXENV_UNDI_CLEANUP,
|
|
&undi_cleanup, sizeof ( undi_cleanup ) );
|
|
undi->flags &= ~UNDI_FL_INITIALIZED;
|
|
|
|
/* Unhook UNDI stack */
|
|
memset ( &stop_undi, 0, sizeof ( stop_undi ) );
|
|
pxeparent_call ( undinet_entry, PXENV_STOP_UNDI, &stop_undi,
|
|
sizeof ( stop_undi ) );
|
|
undi->flags &= ~UNDI_FL_STARTED;
|
|
}
|
|
|
|
/* Clear entry point */
|
|
memset ( &undinet_entry, 0, sizeof ( undinet_entry ) );
|
|
|
|
/* Free network device */
|
|
netdev_nullify ( netdev );
|
|
netdev_put ( netdev );
|
|
|
|
DBGC ( undinic, "UNDINIC %p removed\n", undinic );
|
|
}
|