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- /*
- * Copyright (C) 2007 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 <ipxe/dhcp.h>
- #include <pxeparent.h>
- #include <pxe_api.h>
- #include <pxe_types.h>
- #include <pxe.h>
-
- /** @file
- *
- * Call interface to parent PXE stack
- *
- */
-
- /**
- * Name PXE API call
- *
- * @v function API call number
- * @ret name API call name
- */
- static inline __attribute__ (( always_inline )) const char *
- pxeparent_function_name ( unsigned int function ) {
- switch ( function ) {
- case PXENV_START_UNDI:
- return "PXENV_START_UNDI";
- case PXENV_STOP_UNDI:
- return "PXENV_STOP_UNDI";
- case PXENV_UNDI_STARTUP:
- return "PXENV_UNDI_STARTUP";
- case PXENV_UNDI_CLEANUP:
- return "PXENV_UNDI_CLEANUP";
- case PXENV_UNDI_INITIALIZE:
- return "PXENV_UNDI_INITIALIZE";
- case PXENV_UNDI_RESET_ADAPTER:
- return "PXENV_UNDI_RESET_ADAPTER";
- case PXENV_UNDI_SHUTDOWN:
- return "PXENV_UNDI_SHUTDOWN";
- case PXENV_UNDI_OPEN:
- return "PXENV_UNDI_OPEN";
- case PXENV_UNDI_CLOSE:
- return "PXENV_UNDI_CLOSE";
- case PXENV_UNDI_TRANSMIT:
- return "PXENV_UNDI_TRANSMIT";
- case PXENV_UNDI_SET_MCAST_ADDRESS:
- return "PXENV_UNDI_SET_MCAST_ADDRESS";
- case PXENV_UNDI_SET_STATION_ADDRESS:
- return "PXENV_UNDI_SET_STATION_ADDRESS";
- case PXENV_UNDI_SET_PACKET_FILTER:
- return "PXENV_UNDI_SET_PACKET_FILTER";
- case PXENV_UNDI_GET_INFORMATION:
- return "PXENV_UNDI_GET_INFORMATION";
- case PXENV_UNDI_GET_STATISTICS:
- return "PXENV_UNDI_GET_STATISTICS";
- case PXENV_UNDI_CLEAR_STATISTICS:
- return "PXENV_UNDI_CLEAR_STATISTICS";
- case PXENV_UNDI_INITIATE_DIAGS:
- return "PXENV_UNDI_INITIATE_DIAGS";
- case PXENV_UNDI_FORCE_INTERRUPT:
- return "PXENV_UNDI_FORCE_INTERRUPT";
- case PXENV_UNDI_GET_MCAST_ADDRESS:
- return "PXENV_UNDI_GET_MCAST_ADDRESS";
- case PXENV_UNDI_GET_NIC_TYPE:
- return "PXENV_UNDI_GET_NIC_TYPE";
- case PXENV_UNDI_GET_IFACE_INFO:
- return "PXENV_UNDI_GET_IFACE_INFO";
- /*
- * Duplicate case value; this is a bug in the PXE specification.
- *
- * case PXENV_UNDI_GET_STATE:
- * return "PXENV_UNDI_GET_STATE";
- */
- case PXENV_UNDI_ISR:
- return "PXENV_UNDI_ISR";
- case PXENV_GET_CACHED_INFO:
- return "PXENV_GET_CACHED_INFO";
- default:
- return "UNKNOWN API CALL";
- }
- }
-
- /**
- * PXE parent parameter block
- *
- * Used as the paramter block for all parent PXE API calls. Resides in base
- * memory.
- */
- static union u_PXENV_ANY __bss16 ( pxeparent_params );
- #define pxeparent_params __use_data16 ( pxeparent_params )
-
- /** PXE parent entry point
- *
- * Used as the indirection vector for all parent PXE API calls. Resides in
- * base memory.
- */
- SEGOFF16_t __bss16 ( pxeparent_entry_point );
- #define pxeparent_entry_point __use_data16 ( pxeparent_entry_point )
-
- /**
- * Issue parent PXE API call
- *
- * @v entry Parent PXE stack entry point
- * @v function API call number
- * @v params PXE parameter block
- * @v params_len Length of PXE parameter block
- * @ret rc Return status code
- */
- int pxeparent_call ( SEGOFF16_t entry, unsigned int function,
- void *params, size_t params_len ) {
- PXENV_EXIT_t exit;
- int discard_b, discard_D;
- int rc;
-
- /* Copy parameter block and entry point */
- assert ( params_len <= sizeof ( pxeparent_params ) );
- memcpy ( &pxeparent_params, params, params_len );
- memcpy ( &pxeparent_entry_point, &entry, sizeof ( entry ) );
-
- /* Call real-mode entry point. This calling convention will
- * work with both the !PXE and the PXENV+ entry points.
- */
- __asm__ __volatile__ ( REAL_CODE ( "pushw %%es\n\t"
- "pushw %%di\n\t"
- "pushw %%bx\n\t"
- "lcall *pxeparent_entry_point\n\t"
- "addw $6, %%sp\n\t" )
- : "=a" ( exit ), "=b" ( discard_b ),
- "=D" ( discard_D )
- : "b" ( function ),
- "D" ( __from_data16 ( &pxeparent_params ) )
- : "ecx", "edx", "esi", "ebp" );
-
- /* Determine return status code based on PXENV_EXIT and
- * PXENV_STATUS
- */
- if ( exit == PXENV_EXIT_SUCCESS ) {
- rc = 0;
- } else {
- rc = -pxeparent_params.Status;
- /* Paranoia; don't return success for the combination
- * of PXENV_EXIT_FAILURE but PXENV_STATUS_SUCCESS
- */
- if ( rc == 0 )
- rc = -EIO;
- }
-
- /* If anything goes wrong, print as much debug information as
- * it's possible to give.
- */
- if ( rc != 0 ) {
- SEGOFF16_t rm_params = {
- .segment = rm_ds,
- .offset = __from_data16 ( &pxeparent_params ),
- };
-
- DBG ( "PXEPARENT %s failed: %s\n",
- pxeparent_function_name ( function ), strerror ( rc ) );
- DBG ( "PXEPARENT parameters at %04x:%04x length "
- "%#02zx, entry point at %04x:%04x\n",
- rm_params.segment, rm_params.offset, params_len,
- pxeparent_entry_point.segment,
- pxeparent_entry_point.offset );
- DBG ( "PXEPARENT parameters provided:\n" );
- DBG_HDA ( rm_params, params, params_len );
- DBG ( "PXEPARENT parameters returned:\n" );
- DBG_HDA ( rm_params, &pxeparent_params, params_len );
- }
-
- /* Copy parameter block back */
- memcpy ( params, &pxeparent_params, params_len );
-
- return rc;
- }
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