1 /* 2 * Copyright (C) 2007 Michael Brown <mbrown (at) fensystems.co.uk>. 3 * 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. 8 * 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. 13 * 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. 17 */ 18 19 FILE_LICENCE ( GPL2_OR_LATER ); 20 21 #include <stdint.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <pxe.h> 25 #include <realmode.h> 26 #include <undirom.h> 27 28 /** @file 29 * 30 * UNDI expansion ROMs 31 * 32 */ 33 34 /** List of all UNDI ROMs */ 35 static LIST_HEAD ( undiroms ); 36 37 /** 38 * Parse PXE ROM ID structure 39 * 40 * @v undirom UNDI ROM 41 * @v pxeromid Offset within ROM to PXE ROM ID structure 42 * @ret rc Return status code 43 */ 44 static int undirom_parse_pxeromid ( struct undi_rom *undirom, 45 unsigned int pxeromid ) { 46 struct undi_rom_id undi_rom_id; 47 unsigned int undiloader; 48 49 DBGC ( undirom, "UNDIROM %p has PXE ROM ID at %04x:%04x\n", undirom, 50 undirom->rom_segment, pxeromid ); 51 52 /* Read PXE ROM ID structure and verify */ 53 copy_from_real ( &undi_rom_id, undirom->rom_segment, pxeromid, 54 sizeof ( undi_rom_id ) ); 55 if ( undi_rom_id.Signature != UNDI_ROM_ID_SIGNATURE ) { 56 DBGC ( undirom, "UNDIROM %p has bad PXE ROM ID signature " 57 "%08x\n", undirom, undi_rom_id.Signature ); 58 return -EINVAL; 59 } 60 61 /* Check for UNDI loader */ 62 undiloader = undi_rom_id.UNDILoader; 63 if ( ! undiloader ) { 64 DBGC ( undirom, "UNDIROM %p has no UNDI loader\n", undirom ); 65 return -EINVAL; 66 } 67 68 /* Fill in UNDI ROM loader fields */ 69 undirom->loader_entry.segment = undirom->rom_segment; 70 undirom->loader_entry.offset = undiloader; 71 undirom->code_size = undi_rom_id.CodeSize; 72 undirom->data_size = undi_rom_id.DataSize; 73 74 DBGC ( undirom, "UNDIROM %p has UNDI loader at %04x:%04x " 75 "(code %04zx data %04zx)\n", undirom, 76 undirom->loader_entry.segment, undirom->loader_entry.offset, 77 undirom->code_size, undirom->data_size ); 78 return 0; 79 } 80 81 /** 82 * Parse PCI expansion header 83 * 84 * @v undirom UNDI ROM 85 * @v pcirheader Offset within ROM to PCI expansion header 86 */ 87 static int undirom_parse_pcirheader ( struct undi_rom *undirom, 88 unsigned int pcirheader ) { 89 struct pcir_header pcir_header; 90 91 DBGC ( undirom, "UNDIROM %p has PCI expansion header at %04x:%04x\n", 92 undirom, undirom->rom_segment, pcirheader ); 93 94 /* Read PCI expansion header and verify */ 95 copy_from_real ( &pcir_header, undirom->rom_segment, pcirheader, 96 sizeof ( pcir_header ) ); 97 if ( pcir_header.signature != PCIR_SIGNATURE ) { 98 DBGC ( undirom, "UNDIROM %p has bad PCI expansion header " 99 "signature %08x\n", undirom, pcir_header.signature ); 100 return -EINVAL; 101 } 102 103 /* Fill in UNDI ROM PCI device fields */ 104 undirom->bus_type = PCI_NIC; 105 undirom->bus_id.pci.vendor_id = pcir_header.vendor_id; 106 undirom->bus_id.pci.device_id = pcir_header.device_id; 107 108 DBGC ( undirom, "UNDIROM %p is for PCI devices %04x:%04x\n", undirom, 109 undirom->bus_id.pci.vendor_id, undirom->bus_id.pci.device_id ); 110 return 0; 111 112 } 113 114 /** 115 * Probe UNDI ROM 116 * 117 * @v rom_segment ROM segment address 118 * @ret rc Return status code 119 */ 120 static int undirom_probe ( unsigned int rom_segment ) { 121 struct undi_rom *undirom = NULL; 122 struct undi_rom_header romheader; 123 size_t rom_len; 124 unsigned int pxeromid; 125 unsigned int pcirheader; 126 int rc; 127 128 /* Read expansion ROM header and verify */ 129 copy_from_real ( &romheader, rom_segment, 0, sizeof ( romheader ) ); 130 if ( romheader.Signature != ROM_SIGNATURE ) { 131 rc = -EINVAL; 132 goto err; 133 } 134 rom_len = ( romheader.ROMLength * 512 ); 135 136 /* Allocate memory for UNDI ROM */ 137 undirom = zalloc ( sizeof ( *undirom ) ); 138 if ( ! undirom ) { 139 DBG ( "Could not allocate UNDI ROM structure\n" ); 140 rc = -ENOMEM; 141 goto err; 142 } 143 DBGC ( undirom, "UNDIROM %p trying expansion ROM at %04x:0000 " 144 "(%zdkB)\n", undirom, rom_segment, ( rom_len / 1024 ) ); 145 undirom->rom_segment = rom_segment; 146 147 /* Check for and parse PXE ROM ID */ 148 pxeromid = romheader.PXEROMID; 149 if ( ! pxeromid ) { 150 DBGC ( undirom, "UNDIROM %p has no PXE ROM ID\n", undirom ); 151 rc = -EINVAL; 152 goto err; 153 } 154 if ( pxeromid > rom_len ) { 155 DBGC ( undirom, "UNDIROM %p PXE ROM ID outside ROM\n", 156 undirom ); 157 rc = -EINVAL; 158 goto err; 159 } 160 if ( ( rc = undirom_parse_pxeromid ( undirom, pxeromid ) ) != 0 ) 161 goto err; 162 163 /* Parse PCIR header, if present */ 164 pcirheader = romheader.PCIRHeader; 165 if ( pcirheader ) 166 undirom_parse_pcirheader ( undirom, pcirheader ); 167 168 /* Add to UNDI ROM list and return */ 169 DBGC ( undirom, "UNDIROM %p registered\n", undirom ); 170 list_add ( &undirom->list, &undiroms ); 171 return 0; 172 173 err: 174 free ( undirom ); 175 return rc; 176 } 177 178 /** 179 * Create UNDI ROMs for all possible expansion ROMs 180 * 181 * @ret 182 */ 183 static void undirom_probe_all_roms ( void ) { 184 static int probed = 0; 185 unsigned int rom_segment; 186 187 /* Perform probe only once */ 188 if ( probed ) 189 return; 190 191 DBG ( "Scanning for PXE expansion ROMs\n" ); 192 193 /* Scan through expansion ROM region at 512 byte intervals */ 194 for ( rom_segment = 0xc000 ; rom_segment < 0x10000 ; 195 rom_segment += 0x20 ) { 196 undirom_probe ( rom_segment ); 197 } 198 199 probed = 1; 200 } 201 202 /** 203 * Find UNDI ROM for PCI device 204 * 205 * @v vendor_id PCI vendor ID 206 * @v device_id PCI device ID 207 * @v rombase ROM base address, or 0 for any 208 * @ret undirom UNDI ROM, or NULL 209 */ 210 struct undi_rom * undirom_find_pci ( unsigned int vendor_id, 211 unsigned int device_id, 212 unsigned int rombase ) { 213 struct undi_rom *undirom; 214 215 undirom_probe_all_roms(); 216 217 list_for_each_entry ( undirom, &undiroms, list ) { 218 if ( undirom->bus_type != PCI_NIC ) 219 continue; 220 if ( undirom->bus_id.pci.vendor_id != vendor_id ) 221 continue; 222 if ( undirom->bus_id.pci.device_id != device_id ) 223 continue; 224 if ( rombase && ( ( undirom->rom_segment << 4 ) != rombase ) ) 225 continue; 226 DBGC ( undirom, "UNDIROM %p matched PCI %04x:%04x (%08x)\n", 227 undirom, vendor_id, device_id, rombase ); 228 return undirom; 229 } 230 231 DBG ( "No UNDI ROM matched PCI %04x:%04x (%08x)\n", 232 vendor_id, device_id, rombase ); 233 return NULL; 234 } 235
