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.
19 FILE_LICENCE ( GPL2_OR_LATER );
21 #include <gpxe/dhcp.h>
22 #include <pxeparent.h>
24 #include <pxe_types.h>
29 * Call interface to parent PXE stack
36 * @v function API call number
37 * @ret name API call name
39 static inline __attribute__ (( always_inline )) const char *
40 pxeparent_function_name ( unsigned int function ) {
42 case PXENV_START_UNDI:
43 return "PXENV_START_UNDI";
45 return "PXENV_STOP_UNDI";
46 case PXENV_UNDI_STARTUP:
47 return "PXENV_UNDI_STARTUP";
48 case PXENV_UNDI_CLEANUP:
49 return "PXENV_UNDI_CLEANUP";
50 case PXENV_UNDI_INITIALIZE:
51 return "PXENV_UNDI_INITIALIZE";
52 case PXENV_UNDI_RESET_ADAPTER:
53 return "PXENV_UNDI_RESET_ADAPTER";
54 case PXENV_UNDI_SHUTDOWN:
55 return "PXENV_UNDI_SHUTDOWN";
57 return "PXENV_UNDI_OPEN";
58 case PXENV_UNDI_CLOSE:
59 return "PXENV_UNDI_CLOSE";
60 case PXENV_UNDI_TRANSMIT:
61 return "PXENV_UNDI_TRANSMIT";
62 case PXENV_UNDI_SET_MCAST_ADDRESS:
63 return "PXENV_UNDI_SET_MCAST_ADDRESS";
64 case PXENV_UNDI_SET_STATION_ADDRESS:
65 return "PXENV_UNDI_SET_STATION_ADDRESS";
66 case PXENV_UNDI_SET_PACKET_FILTER:
67 return "PXENV_UNDI_SET_PACKET_FILTER";
68 case PXENV_UNDI_GET_INFORMATION:
69 return "PXENV_UNDI_GET_INFORMATION";
70 case PXENV_UNDI_GET_STATISTICS:
71 return "PXENV_UNDI_GET_STATISTICS";
72 case PXENV_UNDI_CLEAR_STATISTICS:
73 return "PXENV_UNDI_CLEAR_STATISTICS";
74 case PXENV_UNDI_INITIATE_DIAGS:
75 return "PXENV_UNDI_INITIATE_DIAGS";
76 case PXENV_UNDI_FORCE_INTERRUPT:
77 return "PXENV_UNDI_FORCE_INTERRUPT";
78 case PXENV_UNDI_GET_MCAST_ADDRESS:
79 return "PXENV_UNDI_GET_MCAST_ADDRESS";
80 case PXENV_UNDI_GET_NIC_TYPE:
81 return "PXENV_UNDI_GET_NIC_TYPE";
82 case PXENV_UNDI_GET_IFACE_INFO:
83 return "PXENV_UNDI_GET_IFACE_INFO";
85 * Duplicate case value; this is a bug in the PXE specification.
87 * case PXENV_UNDI_GET_STATE:
88 * return "PXENV_UNDI_GET_STATE";
91 return "PXENV_UNDI_ISR";
92 case PXENV_GET_CACHED_INFO:
93 return "PXENV_GET_CACHED_INFO";
95 return "UNKNOWN API CALL";
100 * PXE parent parameter block
102 * Used as the paramter block for all parent PXE API calls. Resides in base
105 static union u_PXENV_ANY __bss16 ( pxeparent_params );
106 #define pxeparent_params __use_data16 ( pxeparent_params )
108 /** PXE parent entry point
110 * Used as the indirection vector for all parent PXE API calls. Resides in
113 SEGOFF16_t __bss16 ( pxeparent_entry_point );
114 #define pxeparent_entry_point __use_data16 ( pxeparent_entry_point )
117 * Issue parent PXE API call
119 * @v entry Parent PXE stack entry point
120 * @v function API call number
121 * @v params PXE parameter block
122 * @v params_len Length of PXE parameter block
123 * @ret rc Return status code
125 int pxeparent_call ( SEGOFF16_t entry, unsigned int function,
126 void *params, size_t params_len ) {
128 int discard_b, discard_D;
131 /* Copy parameter block and entry point */
132 assert ( params_len <= sizeof ( pxeparent_params ) );
133 memcpy ( &pxeparent_params, params, params_len );
134 memcpy ( &pxeparent_entry_point, &entry, sizeof ( entry ) );
136 /* Call real-mode entry point. This calling convention will
137 * work with both the !PXE and the PXENV+ entry points.
139 __asm__ __volatile__ ( REAL_CODE ( "pushw %%es\n\t"
142 "lcall *pxeparent_entry_point\n\t"
143 "addw $6, %%sp\n\t" )
144 : "=a" ( exit ), "=b" ( discard_b ),
147 "D" ( __from_data16 ( &pxeparent_params ) )
148 : "ecx", "edx", "esi", "ebp" );
150 /* PXE API calls may rudely change the status of A20 and not
151 * bother to restore it afterwards. Intel is known to be
154 * Note that we will return to this point even if A20 gets
155 * screwed up by the parent PXE stack, because Etherboot always
156 * resides in an even megabyte of RAM.
160 /* Determine return status code based on PXENV_EXIT and
163 if ( exit == PXENV_EXIT_SUCCESS ) {
166 rc = -pxeparent_params.Status;
167 /* Paranoia; don't return success for the combination
168 * of PXENV_EXIT_FAILURE but PXENV_STATUS_SUCCESS
174 /* If anything goes wrong, print as much debug information as
175 * it's possible to give.
178 SEGOFF16_t rm_params = {
180 .offset = __from_data16 ( &pxeparent_params ),
183 DBG ( "PXEPARENT %s failed: %s\n",
184 pxeparent_function_name ( function ), strerror ( rc ) );
185 DBG ( "PXEPARENT parameters at %04x:%04x length "
186 "%#02zx, entry point at %04x:%04x\n",
187 rm_params.segment, rm_params.offset, params_len,
188 pxeparent_entry_point.segment,
189 pxeparent_entry_point.offset );
190 DBG ( "PXEPARENT parameters provided:\n" );
191 DBG_HDA ( rm_params, params, params_len );
192 DBG ( "PXEPARENT parameters returned:\n" );
193 DBG_HDA ( rm_params, &pxeparent_params, params_len );
196 /* Copy parameter block back */
197 memcpy ( params, &pxeparent_params, params_len );