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- /** @file
- *
- * PXE Preboot API
- *
- */
-
- /* PXE API interface for Etherboot.
- *
- * Copyright (C) 2004 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.
- */
-
- #include <stdint.h>
- #include <string.h>
- #include <stdlib.h>
- #include <gpxe/uaccess.h>
- #include <gpxe/dhcp.h>
- #include <gpxe/device.h>
- #include <gpxe/netdevice.h>
- #include <gpxe/isapnp.h>
- #include <gpxe/init.h>
- #include <basemem_packet.h>
- #include "pxe.h"
- #include "pxe_call.h"
-
- /** Filename used for last TFTP request
- *
- * This is a bug-for-bug compatibility hack needed in order to work
- * with Microsoft Remote Installation Services (RIS). The filename
- * used in a call to PXENV_RESTART_TFTP must be returned as the DHCP
- * filename in subsequent calls to PXENV_GET_CACHED_INFO.
- */
- static char *pxe_ris_filename = NULL;
-
- /* Avoid dragging in isapnp.o unnecessarily */
- uint16_t isapnp_read_port;
-
- /**
- * UNLOAD BASE CODE STACK
- *
- * @v None -
- * @ret ...
- *
- */
- PXENV_EXIT_t pxenv_unload_stack ( struct s_PXENV_UNLOAD_STACK *unload_stack ) {
- DBG ( "PXENV_UNLOAD_STACK" );
-
- unload_stack->Status = PXENV_STATUS_SUCCESS;
- return PXENV_EXIT_SUCCESS;
- }
-
- /* PXENV_GET_CACHED_INFO
- *
- * Status: working
- */
- PXENV_EXIT_t pxenv_get_cached_info ( struct s_PXENV_GET_CACHED_INFO
- *get_cached_info ) {
- struct dhcp_packet dhcppkt;
- void *data = NULL;
- size_t len;
- int msgtype;
- struct dhcp_option_block *options;
- userptr_t buffer;
- int rc;
-
- DBG ( "PXENV_GET_CACHED_INFO %d", get_cached_info->PacketType );
-
- DBG ( " to %04x:%04x+%x", get_cached_info->Buffer.segment,
- get_cached_info->Buffer.offset, get_cached_info->BufferSize );
-
- /* This is really, really awkward to support with our multiple
- * sources of options.
- */
- len = get_cached_info->BufferSize;
- if ( len == 0 ) {
- len = sizeof ( basemem_packet );
- get_cached_info->Buffer.segment = rm_ds;
- get_cached_info->Buffer.offset =
- ( unsigned int ) ( & __from_data16 ( basemem_packet ) );
- get_cached_info->BufferLimit = len;
- }
-
- /* Allocate space for temporary copy */
- data = malloc ( len );
- if ( ! data ) {
- DBG ( " out of memory" );
- goto err;
- }
-
- /* Construct DHCP packet */
- if ( get_cached_info->PacketType == PXENV_PACKET_TYPE_DHCP_DISCOVER ) {
- msgtype = DHCPDISCOVER;
- options = &dhcp_request_options;
- } else {
- msgtype = DHCPACK;
- options = NULL;
- }
- if ( ( rc = create_dhcp_packet ( pxe_netdev, msgtype, data, len,
- &dhcppkt ) ) != 0 ) {
- DBG ( " failed to build packet" );
- goto err;
- }
- if ( ( rc = copy_dhcp_packet_options ( &dhcppkt, options ) ) != 0 ) {
- DBG ( " failed to copy options" );
- goto err;
- }
-
- /* Overwrite filename to work around Microsoft RIS bug */
- if ( pxe_ris_filename ) {
- strncpy ( dhcppkt.dhcphdr->file, pxe_ris_filename,
- sizeof ( dhcppkt.dhcphdr->file ) );
- }
-
- /* Copy packet to client buffer */
- buffer = real_to_user ( get_cached_info->Buffer.segment,
- get_cached_info->Buffer.offset );
- len = dhcppkt.len;
- copy_to_user ( buffer, 0, data, len );
- get_cached_info->BufferSize = len;
-
- free ( data );
- get_cached_info->Status = PXENV_STATUS_SUCCESS;
- return PXENV_EXIT_SUCCESS;
-
- err:
- if ( data )
- free ( data );
- get_cached_info->Status = PXENV_STATUS_OUT_OF_RESOURCES;
- return PXENV_EXIT_FAILURE;
- }
-
- /* PXENV_RESTART_TFTP
- *
- * Status: working
- */
- PXENV_EXIT_t pxenv_restart_tftp ( struct s_PXENV_TFTP_READ_FILE
- *restart_tftp ) {
- PXENV_EXIT_t tftp_exit;
-
- DBG ( "PXENV_RESTART_TFTP " );
-
- /* Work around Microsoft RIS bug */
- free ( pxe_ris_filename );
- pxe_ris_filename = strdup ( ( char * ) restart_tftp->FileName );
- if ( ! pxe_ris_filename ) {
- restart_tftp->Status = PXENV_STATUS_OUT_OF_RESOURCES;
- return PXENV_EXIT_FAILURE;
- }
-
- /* Words cannot describe the complete mismatch between the PXE
- * specification and any possible version of reality...
- */
- restart_tftp->Buffer = PXE_LOAD_PHYS; /* Fixed by spec, apparently */
- restart_tftp->BufferSize = ( 0xa0000 - PXE_LOAD_PHYS ); /* Near enough */
- tftp_exit = pxenv_tftp_read_file ( restart_tftp );
- if ( tftp_exit != PXENV_EXIT_SUCCESS )
- return tftp_exit;
-
- /* Fire up the new NBP */
- restart_tftp->Status = pxe_start_nbp();
-
- /* Not sure what "SUCCESS" actually means, since we can only
- * return if the new NBP failed to boot...
- */
- return PXENV_EXIT_SUCCESS;
- }
-
- /* PXENV_START_UNDI
- *
- * Status: working
- */
- PXENV_EXIT_t pxenv_start_undi ( struct s_PXENV_START_UNDI *start_undi ) {
- unsigned int bus_type;
- unsigned int location;
- struct net_device *netdev;
-
- DBG ( "PXENV_START_UNDI %04x:%04x:%04x",
- start_undi->AX, start_undi->BX, start_undi->DX );
-
- /* Determine bus type and location. Use a heuristic to decide
- * whether we are PCI or ISAPnP
- */
- if ( ( start_undi->DX >= ISAPNP_READ_PORT_MIN ) &&
- ( start_undi->DX <= ISAPNP_READ_PORT_MAX ) &&
- ( start_undi->BX >= ISAPNP_CSN_MIN ) &&
- ( start_undi->BX <= ISAPNP_CSN_MAX ) ) {
- bus_type = BUS_TYPE_ISAPNP;
- location = start_undi->BX;
- /* Record ISAPnP read port for use by isapnp.c */
- isapnp_read_port = start_undi->DX;
- } else {
- bus_type = BUS_TYPE_PCI;
- location = start_undi->AX;
- }
-
- /* Probe for devices, etc. */
- startup();
-
- /* Look for a matching net device */
- netdev = find_netdev_by_location ( bus_type, location );
- if ( ! netdev ) {
- DBG ( " no net device found" );
- start_undi->Status = PXENV_STATUS_UNDI_CANNOT_INITIALIZE_NIC;
- return PXENV_EXIT_FAILURE;
- }
- DBG ( " using netdev %s", netdev->name );
-
- /* Save as PXE net device */
- pxe_set_netdev ( netdev );
-
- /* Hook INT 1A */
- pxe_hook_int1a();
-
- start_undi->Status = PXENV_STATUS_SUCCESS;
- return PXENV_EXIT_SUCCESS;
- }
-
- /* PXENV_STOP_UNDI
- *
- * Status: working
- */
- PXENV_EXIT_t pxenv_stop_undi ( struct s_PXENV_STOP_UNDI *stop_undi ) {
- DBG ( "PXENV_STOP_UNDI" );
-
- /* Unhook INT 1A */
- pxe_unhook_int1a();
-
- /* Clear PXE net device */
- pxe_set_netdev ( NULL );
-
- /* Prepare for unload */
- shutdown();
-
- stop_undi->Status = PXENV_STATUS_SUCCESS;
- return PXENV_EXIT_SUCCESS;
- }
-
- /* PXENV_START_BASE
- *
- * Status: won't implement (requires major structural changes)
- */
- PXENV_EXIT_t pxenv_start_base ( struct s_PXENV_START_BASE *start_base ) {
- DBG ( "PXENV_START_BASE" );
-
- start_base->Status = PXENV_STATUS_UNSUPPORTED;
- return PXENV_EXIT_FAILURE;
- }
-
- /* PXENV_STOP_BASE
- *
- * Status: working
- */
- PXENV_EXIT_t pxenv_stop_base ( struct s_PXENV_STOP_BASE *stop_base ) {
- DBG ( "PXENV_STOP_BASE" );
-
- /* The only time we will be called is when the NBP is trying
- * to shut down the PXE stack. There's nothing we need to do
- * in this call.
- */
-
- stop_base->Status = PXENV_STATUS_SUCCESS;
- return PXENV_EXIT_SUCCESS;
- }
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