summaryrefslogtreecommitdiffstats
path: root/src/arch/x86/drivers/net/undirom.c
blob: 257b12411a4264bc0e61c659424409669b83a5e7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <pxe.h>
#include <realmode.h>
#include <undirom.h>

/** @file
 *
 * UNDI expansion ROMs
 *
 */

/** List of all UNDI ROMs */
static LIST_HEAD ( undiroms );

/**
 * Parse PXE ROM ID structure
 *
 * @v undirom		UNDI ROM
 * @v pxeromid		Offset within ROM to PXE ROM ID structure
 * @ret rc		Return status code
 */
static int undirom_parse_pxeromid ( struct undi_rom *undirom,
				   unsigned int pxeromid ) {
	struct undi_rom_id undi_rom_id;
	unsigned int undiloader;

	DBGC ( undirom, "UNDIROM %p has PXE ROM ID at %04x:%04x\n", undirom,
	       undirom->rom_segment, pxeromid );

	/* Read PXE ROM ID structure and verify */
	copy_from_real ( &undi_rom_id, undirom->rom_segment, pxeromid,
			 sizeof ( undi_rom_id ) );
	if ( undi_rom_id.Signature != UNDI_ROM_ID_SIGNATURE ) {
		DBGC ( undirom, "UNDIROM %p has bad PXE ROM ID signature "
		       "%08x\n", undirom, undi_rom_id.Signature );
		return -EINVAL;
	}

	/* Check for UNDI loader */
	undiloader = undi_rom_id.UNDILoader;
	if ( ! undiloader ) {
		DBGC ( undirom, "UNDIROM %p has no UNDI loader\n", undirom );
		return -EINVAL;
	}

	/* Fill in UNDI ROM loader fields */
	undirom->loader_entry.segment = undirom->rom_segment;
	undirom->loader_entry.offset = undiloader;
	undirom->code_size = undi_rom_id.CodeSize;
	undirom->data_size = undi_rom_id.DataSize;

	DBGC ( undirom, "UNDIROM %p has UNDI loader at %04x:%04x "
	       "(code %04zx data %04zx)\n", undirom,
	       undirom->loader_entry.segment, undirom->loader_entry.offset,
	       undirom->code_size, undirom->data_size );
	return 0;
}

/**
 * Parse PCI expansion header
 *
 * @v undirom		UNDI ROM
 * @v pcirheader	Offset within ROM to PCI expansion header
 */
static int undirom_parse_pcirheader ( struct undi_rom *undirom,
				     unsigned int pcirheader ) {
	struct pcir_header pcir_header;

	DBGC ( undirom, "UNDIROM %p has PCI expansion header at %04x:%04x\n",
	       undirom, undirom->rom_segment, pcirheader );

	/* Read PCI expansion header and verify */
	copy_from_real ( &pcir_header, undirom->rom_segment, pcirheader,
			 sizeof ( pcir_header ) );
	if ( pcir_header.signature != PCIR_SIGNATURE ) {
		DBGC ( undirom, "UNDIROM %p has bad PCI expansion header "
		       "signature %08x\n", undirom, pcir_header.signature );
		return -EINVAL;
	}

	/* Fill in UNDI ROM PCI device fields */
	undirom->bus_type = PCI_NIC;
	undirom->bus_id.pci.vendor_id = pcir_header.vendor_id;
	undirom->bus_id.pci.device_id = pcir_header.device_id;

	DBGC ( undirom, "UNDIROM %p is for PCI devices %04x:%04x\n", undirom,
	       undirom->bus_id.pci.vendor_id, undirom->bus_id.pci.device_id );
	return 0;
	
}

/**
 * Probe UNDI ROM
 *
 * @v rom_segment	ROM segment address
 * @ret rc		Return status code
 */
static int undirom_probe ( unsigned int rom_segment ) {
	struct undi_rom *undirom = NULL;
	struct undi_rom_header romheader;
	size_t rom_len;
	unsigned int pxeromid;
	unsigned int pcirheader;
	int rc;

	/* Read expansion ROM header and verify */
	copy_from_real ( &romheader, rom_segment, 0, sizeof ( romheader ) );
	if ( romheader.Signature != ROM_SIGNATURE ) {
		rc = -EINVAL;
		goto err;
	}
	rom_len = ( romheader.ROMLength * 512 );

	/* Allocate memory for UNDI ROM */
	undirom = zalloc ( sizeof ( *undirom ) );
	if ( ! undirom ) {
		DBG ( "Could not allocate UNDI ROM structure\n" );
		rc = -ENOMEM;
		goto err;
	}
	DBGC ( undirom, "UNDIROM %p trying expansion ROM at %04x:0000 "
	       "(%zdkB)\n", undirom, rom_segment, ( rom_len / 1024 ) );
	undirom->rom_segment = rom_segment;

	/* Check for and parse PXE ROM ID */
	pxeromid = romheader.PXEROMID;
	if ( ! pxeromid ) {
		DBGC ( undirom, "UNDIROM %p has no PXE ROM ID\n", undirom );
		rc = -EINVAL;
		goto err;
	}
	if ( pxeromid > rom_len ) {
		DBGC ( undirom, "UNDIROM %p PXE ROM ID outside ROM\n",
		       undirom );
		rc = -EINVAL;
		goto err;
	}
	if ( ( rc = undirom_parse_pxeromid ( undirom, pxeromid ) ) != 0 )
		goto err;

	/* Parse PCIR header, if present */
	pcirheader = romheader.PCIRHeader;
	if ( pcirheader )
		undirom_parse_pcirheader ( undirom, pcirheader );

	/* Add to UNDI ROM list and return */
	DBGC ( undirom, "UNDIROM %p registered\n", undirom );
	list_add_tail ( &undirom->list, &undiroms );
	return 0;

 err:
	free ( undirom );
	return rc;
}

/**
 * Create UNDI ROMs for all possible expansion ROMs
 *
 * @ret 
 */
static void undirom_probe_all_roms ( void ) {
	static int probed = 0;
	unsigned int rom_segment;

	/* Perform probe only once */
	if ( probed )
		return;

	DBG ( "Scanning for PXE expansion ROMs\n" );

	/* Scan through expansion ROM region at 512 byte intervals */
	for ( rom_segment = 0xc000 ; rom_segment < 0x10000 ;
	      rom_segment += 0x20 ) {
		undirom_probe ( rom_segment );
	}

	probed = 1;
}

/**
 * Find UNDI ROM for PCI device
 *
 * @v vendor_id		PCI vendor ID
 * @v device_id		PCI device ID
 * @v rombase		ROM base address, or 0 for any
 * @ret undirom		UNDI ROM, or NULL
 */
struct undi_rom * undirom_find_pci ( unsigned int vendor_id,
				     unsigned int device_id,
				     unsigned int rombase ) {
	struct undi_rom *undirom;

	undirom_probe_all_roms();

	list_for_each_entry ( undirom, &undiroms, list ) {
		if ( undirom->bus_type != PCI_NIC )
			continue;
		if ( undirom->bus_id.pci.vendor_id != vendor_id )
			continue;
		if ( undirom->bus_id.pci.device_id != device_id )
			continue;
		if ( rombase && ( ( undirom->rom_segment << 4 ) != rombase ) )
			continue;
		DBGC ( undirom, "UNDIROM %p matched PCI %04x:%04x (%08x)\n",
		       undirom, vendor_id, device_id, rombase );
		return undirom;
	}

	DBG ( "No UNDI ROM matched PCI %04x:%04x (%08x)\n",
	      vendor_id, device_id, rombase );
	return NULL;
}