2 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <basemem_packet.h>
26 #include <gpxe/iobuf.h>
27 #include <gpxe/netdevice.h>
28 #include <gpxe/if_ether.h>
29 #include <gpxe/ethernet.h>
36 * UNDI network device driver
44 /** Assigned IRQ number */
46 /** Currently processing ISR */
50 static void undinet_close ( struct net_device *netdev );
52 /*****************************************************************************
56 *****************************************************************************
62 * @v function API call number
63 * @ret name API call name
65 static inline __attribute__ (( always_inline )) const char *
66 undinet_function_name ( unsigned int function ) {
68 case PXENV_START_UNDI:
69 return "PXENV_START_UNDI";
71 return "PXENV_STOP_UNDI";
72 case PXENV_UNDI_STARTUP:
73 return "PXENV_UNDI_STARTUP";
74 case PXENV_UNDI_CLEANUP:
75 return "PXENV_UNDI_CLEANUP";
76 case PXENV_UNDI_INITIALIZE:
77 return "PXENV_UNDI_INITIALIZE";
78 case PXENV_UNDI_RESET_ADAPTER:
79 return "PXENV_UNDI_RESET_ADAPTER";
80 case PXENV_UNDI_SHUTDOWN:
81 return "PXENV_UNDI_SHUTDOWN";
83 return "PXENV_UNDI_OPEN";
84 case PXENV_UNDI_CLOSE:
85 return "PXENV_UNDI_CLOSE";
86 case PXENV_UNDI_TRANSMIT:
87 return "PXENV_UNDI_TRANSMIT";
88 case PXENV_UNDI_SET_MCAST_ADDRESS:
89 return "PXENV_UNDI_SET_MCAST_ADDRESS";
90 case PXENV_UNDI_SET_STATION_ADDRESS:
91 return "PXENV_UNDI_SET_STATION_ADDRESS";
92 case PXENV_UNDI_SET_PACKET_FILTER:
93 return "PXENV_UNDI_SET_PACKET_FILTER";
94 case PXENV_UNDI_GET_INFORMATION:
95 return "PXENV_UNDI_GET_INFORMATION";
96 case PXENV_UNDI_GET_STATISTICS:
97 return "PXENV_UNDI_GET_STATISTICS";
98 case PXENV_UNDI_CLEAR_STATISTICS:
99 return "PXENV_UNDI_CLEAR_STATISTICS";
100 case PXENV_UNDI_INITIATE_DIAGS:
101 return "PXENV_UNDI_INITIATE_DIAGS";
102 case PXENV_UNDI_FORCE_INTERRUPT:
103 return "PXENV_UNDI_FORCE_INTERRUPT";
104 case PXENV_UNDI_GET_MCAST_ADDRESS:
105 return "PXENV_UNDI_GET_MCAST_ADDRESS";
106 case PXENV_UNDI_GET_NIC_TYPE:
107 return "PXENV_UNDI_GET_NIC_TYPE";
108 case PXENV_UNDI_GET_IFACE_INFO:
109 return "PXENV_UNDI_GET_IFACE_INFO";
111 * Duplicate case value; this is a bug in the PXE specification.
113 * case PXENV_UNDI_GET_STATE:
114 * return "PXENV_UNDI_GET_STATE";
117 return "PXENV_UNDI_ISR";
119 return "UNKNOWN API CALL";
124 * UNDI parameter block
126 * Used as the paramter block for all UNDI API calls. Resides in base
129 static union u_PXENV_ANY __data16 ( undinet_params );
130 #define undinet_params __use_data16 ( undinet_params )
134 * Used as the indirection vector for all UNDI API calls. Resides in
137 static SEGOFF16_t __data16 ( undinet_entry_point );
138 #define undinet_entry_point __use_data16 ( undinet_entry_point )
141 * Issue UNDI API call
143 * @v undinic UNDI NIC
144 * @v function API call number
145 * @v params UNDI parameter block
146 * @v params_len Length of UNDI parameter block
147 * @ret rc Return status code
149 static int undinet_call ( struct undi_nic *undinic, unsigned int function,
150 void *params, size_t params_len ) {
152 int discard_b, discard_D;
155 /* Copy parameter block and entry point */
156 assert ( params_len <= sizeof ( undinet_params ) );
157 memcpy ( &undinet_params, params, params_len );
158 undinet_entry_point = undinic->entry;
160 /* Call real-mode entry point. This calling convention will
161 * work with both the !PXE and the PXENV+ entry points.
163 __asm__ __volatile__ ( REAL_CODE ( "pushw %%es\n\t"
167 "addw $6, %%sp\n\t" )
168 : "=a" ( exit ), "=b" ( discard_b ),
170 : "p" ( &__from_data16 ( undinet_entry_point )),
172 "D" ( &__from_data16 ( undinet_params ) )
173 : "ecx", "edx", "esi", "ebp" );
175 /* UNDI API calls may rudely change the status of A20 and not
176 * bother to restore it afterwards. Intel is known to be
179 * Note that we will return to this point even if A20 gets
180 * screwed up by the UNDI driver, because Etherboot always
181 * resides in an even megabyte of RAM.
185 /* Determine return status code based on PXENV_EXIT and
188 if ( exit == PXENV_EXIT_SUCCESS ) {
191 rc = -undinet_params.Status;
192 /* Paranoia; don't return success for the combination
193 * of PXENV_EXIT_FAILURE but PXENV_STATUS_SUCCESS
199 /* If anything goes wrong, print as much debug information as
200 * it's possible to give.
203 SEGOFF16_t rm_params = {
205 .offset = (intptr_t) &__from_data16 ( undinet_params ),
208 DBGC ( undinic, "UNDINIC %p %s failed: %s\n", undinic,
209 undinet_function_name ( function ), strerror ( rc ) );
210 DBGC ( undinic, "UNDINIC %p parameters at %04x:%04x length "
211 "%#02x, entry point at %04x:%04x\n", undinic,
212 rm_params.segment, rm_params.offset, params_len,
213 undinic->entry.segment, undinic->entry.offset );
214 DBGC ( undinic, "UNDINIC %p parameters provided:\n", undinic );
215 DBGC_HDA ( undinic, rm_params, params, params_len );
216 DBGC ( undinic, "UNDINIC %p parameters returned:\n", undinic );
217 DBGC_HDA ( undinic, rm_params, &undinet_params, params_len );
220 /* Copy parameter block back */
221 memcpy ( params, &undinet_params, params_len );
226 /*****************************************************************************
228 * UNDI interrupt service routine
230 *****************************************************************************
234 * UNDI interrupt service routine
236 * The UNDI ISR simply increments a counter (@c trigger_count) and
239 extern void undinet_isr ( void );
241 /** Dummy chain vector */
242 static struct segoff prev_handler[ IRQ_MAX + 1 ];
244 /** IRQ trigger count */
245 static volatile uint8_t __text16 ( trigger_count ) = 0;
246 #define trigger_count __use_text16 ( trigger_count )
249 * Hook UNDI interrupt service routine
253 * The UNDI ISR specifically does @b not chain to the previous
254 * interrupt handler. BIOSes seem to install somewhat perverse
255 * default interrupt handlers; some do nothing other than an iret (and
256 * so will cause a screaming interrupt if there really is another
257 * interrupting device) and some disable the interrupt at the PIC (and
258 * so will bring our own interrupts to a shuddering halt).
260 static void undinet_hook_isr ( unsigned int irq ) {
262 assert ( irq <= IRQ_MAX );
264 __asm__ __volatile__ ( TEXT16_CODE ( "\nundinet_isr:\n\t"
267 : : "p" ( & __from_text16 ( trigger_count ) ) );
269 hook_bios_interrupt ( IRQ_INT ( irq ),
270 ( ( unsigned int ) undinet_isr ),
271 &prev_handler[irq] );
276 * Unhook UNDI interrupt service routine
280 static void undinet_unhook_isr ( unsigned int irq ) {
282 assert ( irq <= IRQ_MAX );
284 unhook_bios_interrupt ( IRQ_INT ( irq ),
285 ( ( unsigned int ) undinet_isr ),
286 &prev_handler[irq] );
290 * Test to see if UNDI ISR has been triggered
292 * @ret triggered ISR has been triggered since last check
294 static int undinet_isr_triggered ( void ) {
295 static unsigned int last_trigger_count = 0;
296 unsigned int this_trigger_count;
298 /* Read trigger_count. Do this only once; it is volatile */
299 this_trigger_count = trigger_count;
301 if ( this_trigger_count == last_trigger_count ) {
306 last_trigger_count = this_trigger_count;
311 /*****************************************************************************
313 * UNDI network device interface
315 *****************************************************************************
318 /** UNDI transmit buffer descriptor */
319 static struct s_PXENV_UNDI_TBD __data16 ( undinet_tbd );
320 #define undinet_tbd __use_data16 ( undinet_tbd )
325 * @v netdev Network device
326 * @v iobuf I/O buffer
327 * @ret rc Return status code
329 static int undinet_transmit ( struct net_device *netdev,
330 struct io_buffer *iobuf ) {
331 struct undi_nic *undinic = netdev->priv;
332 struct s_PXENV_UNDI_TRANSMIT undi_transmit;
333 size_t len = iob_len ( iobuf );
336 /* Technically, we ought to make sure that the previous
337 * transmission has completed before we re-use the buffer.
338 * However, this would break a gPXE-running-over-Etherboot
339 * setup, since Etherboot fails to generate TX completions.
340 * In practice this won't be a problem, since our TX datapath
341 * has a very low packet volume and we can get away with
342 * assuming that a TX will be complete by the time we want to
343 * transmit the next packet.
346 /* Copy packet to UNDI I/O buffer */
347 if ( len > sizeof ( basemem_packet ) )
348 len = sizeof ( basemem_packet );
349 memcpy ( &basemem_packet, iobuf->data, len );
351 /* Create PXENV_UNDI_TRANSMIT data structure */
352 memset ( &undi_transmit, 0, sizeof ( undi_transmit ) );
353 undi_transmit.DestAddr.segment = rm_ds;
354 undi_transmit.DestAddr.offset
355 = ( ( unsigned ) & __from_data16 ( undinet_tbd ) );
356 undi_transmit.TBD.segment = rm_ds;
357 undi_transmit.TBD.offset
358 = ( ( unsigned ) & __from_data16 ( undinet_tbd ) );
360 /* Create PXENV_UNDI_TBD data structure */
361 undinet_tbd.ImmedLength = len;
362 undinet_tbd.Xmit.segment = rm_ds;
363 undinet_tbd.Xmit.offset
364 = ( ( unsigned ) & __from_data16 ( basemem_packet ) );
366 /* Issue PXE API call */
367 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_TRANSMIT,
369 sizeof ( undi_transmit ) ) ) != 0 )
372 /* Free I/O buffer */
373 netdev_tx_complete ( netdev, iobuf );
380 * Poll for received packets
382 * @v netdev Network device
383 * @v rx_quota Maximum number of packets to receive
385 * Fun, fun, fun. UNDI drivers don't use polling; they use
386 * interrupts. We therefore cheat and pretend that an interrupt has
387 * occurred every time undinet_poll() is called. This isn't too much
388 * of a hack; PCI devices share IRQs and so the first thing that a
389 * proper ISR should do is call PXENV_UNDI_ISR to determine whether or
390 * not the UNDI NIC generated the interrupt; there is no harm done by
391 * spurious calls to PXENV_UNDI_ISR. Similarly, we wouldn't be
392 * handling them any more rapidly than the usual rate of
393 * undinet_poll() being called even if we did implement a full ISR.
394 * So it should work. Ha!
396 * Addendum (21/10/03). Some cards don't play nicely with this trick,
397 * so instead of doing it the easy way we have to go to all the hassle
398 * of installing a genuine interrupt service routine and dealing with
399 * the wonderful 8259 Programmable Interrupt Controller. Joy.
401 static void undinet_poll ( struct net_device *netdev, unsigned int rx_quota ) {
402 struct undi_nic *undinic = netdev->priv;
403 struct s_PXENV_UNDI_ISR undi_isr;
404 struct io_buffer *iobuf = NULL;
409 if ( ! undinic->isr_processing ) {
410 /* Do nothing unless ISR has been triggered */
411 if ( ! undinet_isr_triggered() )
414 /* See if this was our interrupt */
415 memset ( &undi_isr, 0, sizeof ( undi_isr ) );
416 undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_START;
417 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_ISR, &undi_isr,
418 sizeof ( undi_isr ) ) ) != 0 )
421 /* Send EOI to the PIC. In an ideal world, we'd do
422 * this only for interrupts which the UNDI stack
423 * reports as "ours". However, since we don't (can't)
424 * chain to the previous interrupt handler, we have to
425 * acknowledge all interrupts. See undinet_hook_isr()
426 * for more background.
428 send_eoi ( undinic->irq );
430 /* If this wasn't our interrupt, exit now */
431 if ( undi_isr.FuncFlag != PXENV_UNDI_ISR_OUT_OURS )
434 /* Start ISR processing */
435 undinic->isr_processing = 1;
436 undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_PROCESS;
438 /* Continue ISR processing */
439 undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
442 /* Run through the ISR loop */
444 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_ISR, &undi_isr,
445 sizeof ( undi_isr ) ) ) != 0 )
447 switch ( undi_isr.FuncFlag ) {
448 case PXENV_UNDI_ISR_OUT_TRANSMIT:
449 /* We don't care about transmit completions */
451 case PXENV_UNDI_ISR_OUT_RECEIVE:
452 /* Packet fragment received */
453 len = undi_isr.FrameLength;
454 frag_len = undi_isr.BufferLength;
456 iobuf = alloc_iob ( len );
458 DBGC ( undinic, "UNDINIC %p could not "
459 "allocate %zd bytes for RX buffer\n",
461 /* Fragment will be dropped */
464 if ( frag_len > iob_tailroom ( iobuf ) ) {
465 DBGC ( undinic, "UNDINIC %p fragment too "
466 "large\n", undinic );
467 frag_len = iob_tailroom ( iobuf );
469 copy_from_real ( iob_put ( iobuf, frag_len ),
470 undi_isr.Frame.segment,
471 undi_isr.Frame.offset, frag_len );
472 if ( iob_len ( iobuf ) == len ) {
473 netdev_rx ( netdev, iobuf );
478 case PXENV_UNDI_ISR_OUT_DONE:
479 /* Processing complete */
480 undinic->isr_processing = 0;
483 /* Should never happen */
484 DBGC ( undinic, "UNDINIC %p ISR returned invalid "
485 "FuncFlag %04x\n", undinic, undi_isr.FuncFlag );
486 undinic->isr_processing = 0;
489 undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
494 DBGC ( undinic, "UNDINIC %p returned incomplete packet\n",
496 netdev_rx ( netdev, iobuf );
503 * @v netdev Net device
504 * @ret rc Return status code
506 static int undinet_open ( struct net_device *netdev ) {
507 struct undi_nic *undinic = netdev->priv;
508 struct s_PXENV_UNDI_SET_STATION_ADDRESS undi_set_address;
509 struct s_PXENV_UNDI_OPEN undi_open;
512 /* Hook interrupt service routine and enable interrupt */
513 undinet_hook_isr ( undinic->irq );
514 enable_irq ( undinic->irq );
515 send_eoi ( undinic->irq );
517 /* Set station address. Required for some PXE stacks; will
518 * spuriously fail on others. Ignore failures. We only ever
519 * use it to set the MAC address to the card's permanent value
522 memcpy ( undi_set_address.StationAddress, netdev->ll_addr,
523 sizeof ( undi_set_address.StationAddress ) );
524 undinet_call ( undinic, PXENV_UNDI_SET_STATION_ADDRESS,
525 &undi_set_address, sizeof ( undi_set_address ) );
528 memset ( &undi_open, 0, sizeof ( undi_open ) );
529 undi_open.PktFilter = ( FLTR_DIRECTED | FLTR_BRDCST );
530 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_OPEN, &undi_open,
531 sizeof ( undi_open ) ) ) != 0 )
534 DBGC ( undinic, "UNDINIC %p opened\n", undinic );
538 undinet_close ( netdev );
545 * @v netdev Net device
547 static void undinet_close ( struct net_device *netdev ) {
548 struct undi_nic *undinic = netdev->priv;
549 struct s_PXENV_UNDI_ISR undi_isr;
550 struct s_PXENV_UNDI_CLOSE undi_close;
553 /* Ensure ISR has exited cleanly */
554 while ( undinic->isr_processing ) {
555 undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
556 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_ISR, &undi_isr,
557 sizeof ( undi_isr ) ) ) != 0 )
559 switch ( undi_isr.FuncFlag ) {
560 case PXENV_UNDI_ISR_OUT_TRANSMIT:
561 case PXENV_UNDI_ISR_OUT_RECEIVE:
562 /* Continue draining */
565 /* Stop processing */
566 undinic->isr_processing = 0;
572 undinet_call ( undinic, PXENV_UNDI_CLOSE, &undi_close,
573 sizeof ( undi_close ) );
575 /* Disable interrupt and unhook ISR */
576 disable_irq ( undinic->irq );
577 undinet_unhook_isr ( undinic->irq );
579 DBGC ( undinic, "UNDINIC %p closed\n", undinic );
585 * @v undi UNDI device
586 * @ret rc Return status code
588 int undinet_probe ( struct undi_device *undi ) {
589 struct net_device *netdev;
590 struct undi_nic *undinic;
591 struct s_PXENV_START_UNDI start_undi;
592 struct s_PXENV_UNDI_STARTUP undi_startup;
593 struct s_PXENV_UNDI_INITIALIZE undi_initialize;
594 struct s_PXENV_UNDI_GET_INFORMATION undi_info;
595 struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
596 struct s_PXENV_UNDI_CLEANUP undi_cleanup;
597 struct s_PXENV_STOP_UNDI stop_undi;
600 /* Allocate net device */
601 netdev = alloc_etherdev ( sizeof ( *undinic ) );
604 undinic = netdev->priv;
605 undi_set_drvdata ( undi, netdev );
606 netdev->dev = &undi->dev;
607 memset ( undinic, 0, sizeof ( *undinic ) );
608 undinic->entry = undi->entry;
609 DBGC ( undinic, "UNDINIC %p using UNDI %p\n", undinic, undi );
611 /* Hook in UNDI stack */
612 if ( ! ( undi->flags & UNDI_FL_STARTED ) ) {
613 memset ( &start_undi, 0, sizeof ( start_undi ) );
614 start_undi.AX = undi->pci_busdevfn;
615 start_undi.BX = undi->isapnp_csn;
616 start_undi.DX = undi->isapnp_read_port;
617 start_undi.ES = BIOS_SEG;
618 start_undi.DI = find_pnp_bios();
619 if ( ( rc = undinet_call ( undinic, PXENV_START_UNDI,
621 sizeof ( start_undi ) ) ) != 0 )
624 undi->flags |= UNDI_FL_STARTED;
626 /* Bring up UNDI stack */
627 memset ( &undi_startup, 0, sizeof ( undi_startup ) );
628 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_STARTUP, &undi_startup,
629 sizeof ( undi_startup ) ) ) != 0 )
630 goto err_undi_startup;
631 memset ( &undi_initialize, 0, sizeof ( undi_initialize ) );
632 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_INITIALIZE,
634 sizeof ( undi_initialize ) ) ) != 0 )
635 goto err_undi_initialize;
637 /* Get device information */
638 memset ( &undi_info, 0, sizeof ( undi_info ) );
639 if ( ( rc = undinet_call ( undinic, PXENV_UNDI_GET_INFORMATION,
640 &undi_info, sizeof ( undi_info ) ) ) != 0 )
641 goto err_undi_get_information;
642 memcpy ( netdev->ll_addr, undi_info.PermNodeAddress, ETH_ALEN );
643 undinic->irq = undi_info.IntNumber;
644 if ( undinic->irq > IRQ_MAX ) {
645 DBGC ( undinic, "UNDINIC %p invalid IRQ %d\n",
646 undinic, undinic->irq );
649 DBGC ( undinic, "UNDINIC %p is %s on IRQ %d\n",
650 undinic, eth_ntoa ( netdev->ll_addr ), undinic->irq );
652 /* Point to NIC specific routines */
653 netdev->open = undinet_open;
654 netdev->close = undinet_close;
655 netdev->transmit = undinet_transmit;
656 netdev->poll = undinet_poll;
658 /* Register network device */
659 if ( ( rc = register_netdev ( netdev ) ) != 0 )
662 DBGC ( undinic, "UNDINIC %p added\n", undinic );
667 err_undi_get_information:
669 /* Shut down UNDI stack */
670 memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
671 undinet_call ( undinic, PXENV_UNDI_SHUTDOWN, &undi_shutdown,
672 sizeof ( undi_shutdown ) );
673 memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
674 undinet_call ( undinic, PXENV_UNDI_CLEANUP, &undi_cleanup,
675 sizeof ( undi_cleanup ) );
677 /* Unhook UNDI stack */
678 memset ( &stop_undi, 0, sizeof ( stop_undi ) );
679 undinet_call ( undinic, PXENV_STOP_UNDI, &stop_undi,
680 sizeof ( stop_undi ) );
682 netdev_put ( netdev );
683 undi_set_drvdata ( undi, NULL );
690 * @v undi UNDI device
692 void undinet_remove ( struct undi_device *undi ) {
693 struct net_device *netdev = undi_get_drvdata ( undi );
694 struct undi_nic *undinic = netdev->priv;
695 struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
696 struct s_PXENV_UNDI_CLEANUP undi_cleanup;
697 struct s_PXENV_STOP_UNDI stop_undi;
699 /* Unregister net device */
700 unregister_netdev ( netdev );
702 /* Shut down UNDI stack */
703 memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
704 undinet_call ( undinic, PXENV_UNDI_SHUTDOWN, &undi_shutdown,
705 sizeof ( undi_shutdown ) );
706 memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
707 undinet_call ( undinic, PXENV_UNDI_CLEANUP, &undi_cleanup,
708 sizeof ( undi_cleanup ) );
710 /* Unhook UNDI stack */
711 memset ( &stop_undi, 0, sizeof ( stop_undi ) );
712 undinet_call ( undinic, PXENV_STOP_UNDI, &stop_undi,
713 sizeof ( stop_undi ) );
714 undi->flags &= ~UNDI_FL_STARTED;
716 /* Free network device */
717 netdev_put ( netdev );
719 DBGC ( undinic, "UNDINIC %p removed\n", undinic );