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Stefan Reinauer5380d512007-05-24 09:08:36 +00001/*
Uwe Hermannd1107642007-08-29 17:52:32 +00002 * This file is part of the flashrom project.
Stefan Reinauer5380d512007-05-24 09:08:36 +00003 *
4 * Copyright (C) 2002 Steven James <pyro@linuxlabs.com>
5 * Copyright (C) 2002 Linux Networx
6 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
Stefan Reinauer2d853bb2009-03-17 14:39:25 +00007 * Copyright (C) 2006-2009 coresystems GmbH
Stefan Reinauer5380d512007-05-24 09:08:36 +00008 * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +00009 * Copyright (C) 2010 Carl-Daniel Hailfinger
Stefan Reinauer5380d512007-05-24 09:08:36 +000010 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2 of the License.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
Uwe Hermannd1107642007-08-29 17:52:32 +000022 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Stefan Reinauer5380d512007-05-24 09:08:36 +000023 */
24
Carl-Daniel Hailfinger831e8f42010-05-30 22:24:40 +000025#include <unistd.h>
26#include <stdio.h>
Ollie Lho184a4042005-11-26 21:55:36 +000027#include <stdlib.h>
Ollie Lho184a4042005-11-26 21:55:36 +000028#include <string.h>
Adam Kaufman064b1f22007-02-06 19:47:50 +000029#include "flash.h"
Carl-Daniel Hailfinger5b997c32010-07-27 22:41:39 +000030#include "programmer.h"
Stefan Reinauer2fbe6242008-01-18 16:17:44 +000031#include "coreboot_tables.h"
Ollie Lho184a4042005-11-26 21:55:36 +000032
Uwe Hermanna7e05482007-05-09 10:17:44 +000033char *lb_part = NULL, *lb_vendor = NULL;
Carl-Daniel Hailfingerbc25f942009-07-30 13:30:17 +000034int partvendor_from_cbtable = 0;
Ollie Lho184a4042005-11-26 21:55:36 +000035
Carl-Daniel Hailfinger66ef4e52009-12-13 22:28:00 +000036void lb_vendor_dev_from_string(char *boardstring)
37{
38 char *tempstr2 = NULL;
39 strtok(boardstring, ":");
40 tempstr2 = strtok(NULL, ":");
41 if (tempstr2) {
42 lb_vendor = boardstring;
43 lb_part = tempstr2;
44 } else {
45 lb_vendor = NULL;
46 lb_part = boardstring;
47 }
48}
49
Ollie Lho184a4042005-11-26 21:55:36 +000050static unsigned long compute_checksum(void *addr, unsigned long length)
51{
52 uint8_t *ptr;
53 volatile union {
Uwe Hermanna7e05482007-05-09 10:17:44 +000054 uint8_t byte[2];
Ollie Lho184a4042005-11-26 21:55:36 +000055 uint16_t word;
Michael Karchere7f32092010-01-12 15:36:24 +000056 } chksum;
Uwe Hermannac309342007-10-10 17:42:20 +000057 unsigned long sum;
58 unsigned long i;
Uwe Hermannffec5f32007-08-23 16:08:21 +000059
Ollie Lho184a4042005-11-26 21:55:36 +000060 /* In the most straight forward way possible,
61 * compute an ip style checksum.
62 */
63 sum = 0;
64 ptr = addr;
Uwe Hermanna7e05482007-05-09 10:17:44 +000065 for (i = 0; i < length; i++) {
Ollie Lho184a4042005-11-26 21:55:36 +000066 unsigned long value;
67 value = ptr[i];
Uwe Hermannac309342007-10-10 17:42:20 +000068 if (i & 1) {
Ollie Lho184a4042005-11-26 21:55:36 +000069 value <<= 8;
Uwe Hermannac309342007-10-10 17:42:20 +000070 }
Ollie Lho184a4042005-11-26 21:55:36 +000071 /* Add the new value */
72 sum += value;
73 /* Wrap around the carry */
Uwe Hermannac309342007-10-10 17:42:20 +000074 if (sum > 0xFFFF) {
Ollie Lho184a4042005-11-26 21:55:36 +000075 sum = (sum + (sum >> 16)) & 0xFFFF;
Uwe Hermannac309342007-10-10 17:42:20 +000076 }
Ollie Lho184a4042005-11-26 21:55:36 +000077 }
Michael Karchere7f32092010-01-12 15:36:24 +000078 chksum.byte[0] = sum & 0xff;
79 chksum.byte[1] = (sum >> 8) & 0xff;
Uwe Hermannffec5f32007-08-23 16:08:21 +000080
Michael Karchere7f32092010-01-12 15:36:24 +000081 return (~chksum.word) & 0xFFFF;
Ollie Lho184a4042005-11-26 21:55:36 +000082}
83
84#define for_each_lbrec(head, rec) \
85 for(rec = (struct lb_record *)(((char *)head) + sizeof(*head)); \
86 (((char *)rec) < (((char *)head) + sizeof(*head) + head->table_bytes)) && \
87 (rec->size >= 1) && \
88 ((((char *)rec) + rec->size) <= (((char *)head) + sizeof(*head) + head->table_bytes)); \
Uwe Hermanna7e05482007-05-09 10:17:44 +000089 rec = (struct lb_record *)(((char *)rec) + rec->size))
Ollie Lho184a4042005-11-26 21:55:36 +000090
Uwe Hermanna7e05482007-05-09 10:17:44 +000091static int count_lb_records(struct lb_header *head)
Ollie Lho184a4042005-11-26 21:55:36 +000092{
93 struct lb_record *rec;
94 int count;
Uwe Hermannffec5f32007-08-23 16:08:21 +000095
Ollie Lho184a4042005-11-26 21:55:36 +000096 count = 0;
97 for_each_lbrec(head, rec) {
98 count++;
99 }
Uwe Hermannffec5f32007-08-23 16:08:21 +0000100
Ollie Lho184a4042005-11-26 21:55:36 +0000101 return count;
102}
103
Uwe Hermanna7e05482007-05-09 10:17:44 +0000104static struct lb_header *find_lb_table(void *base, unsigned long start,
105 unsigned long end)
Ollie Lho184a4042005-11-26 21:55:36 +0000106{
107 unsigned long addr;
Uwe Hermannffec5f32007-08-23 16:08:21 +0000108
Ollie Lho184a4042005-11-26 21:55:36 +0000109 /* For now be stupid.... */
Uwe Hermanna7e05482007-05-09 10:17:44 +0000110 for (addr = start; addr < end; addr += 16) {
111 struct lb_header *head =
112 (struct lb_header *)(((char *)base) + addr);
113 struct lb_record *recs =
114 (struct lb_record *)(((char *)base) + addr + sizeof(*head));
Ollie Lho184a4042005-11-26 21:55:36 +0000115 if (memcmp(head->signature, "LBIO", 4) != 0)
116 continue;
Sean Nelson316a29f2010-05-07 20:09:04 +0000117 msg_pdbg("Found candidate at: %08lx-%08lx\n",
Uwe Hermanna7e05482007-05-09 10:17:44 +0000118 addr, addr + head->table_bytes);
Ollie Lho184a4042005-11-26 21:55:36 +0000119 if (head->header_bytes != sizeof(*head)) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000120 msg_perr("Header bytes of %d are incorrect.\n",
Ollie Lho184a4042005-11-26 21:55:36 +0000121 head->header_bytes);
122 continue;
123 }
124 if (count_lb_records(head) != head->table_entries) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000125 msg_perr("Bad record count: %d.\n",
Ollie Lho184a4042005-11-26 21:55:36 +0000126 head->table_entries);
127 continue;
128 }
Uwe Hermanna7e05482007-05-09 10:17:44 +0000129 if (compute_checksum((uint8_t *) head, sizeof(*head)) != 0) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000130 msg_perr("Bad header checksum.\n");
Ollie Lho184a4042005-11-26 21:55:36 +0000131 continue;
132 }
133 if (compute_checksum(recs, head->table_bytes)
Uwe Hermanna7e05482007-05-09 10:17:44 +0000134 != head->table_checksum) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000135 msg_perr("Bad table checksum: %04x.\n",
Ollie Lho184a4042005-11-26 21:55:36 +0000136 head->table_checksum);
137 continue;
138 }
Sean Nelson316a29f2010-05-07 20:09:04 +0000139 msg_pdbg("Found coreboot table at 0x%08lx.\n", addr);
Ollie Lho184a4042005-11-26 21:55:36 +0000140 return head;
141
142 };
Uwe Hermannffec5f32007-08-23 16:08:21 +0000143
Ollie Lho184a4042005-11-26 21:55:36 +0000144 return 0;
145}
146
147static void find_mainboard(struct lb_record *ptr, unsigned long addr)
148{
149 struct lb_mainboard *rec;
150 int max_size;
151 char vendor[256], part[256];
Uwe Hermannffec5f32007-08-23 16:08:21 +0000152
Ollie Lho184a4042005-11-26 21:55:36 +0000153 rec = (struct lb_mainboard *)ptr;
154 max_size = rec->size - sizeof(*rec);
Sean Nelson316a29f2010-05-07 20:09:04 +0000155 msg_pdbg("Vendor ID: %.*s, part ID: %.*s\n",
Uwe Hermanna7e05482007-05-09 10:17:44 +0000156 max_size - rec->vendor_idx,
157 rec->strings + rec->vendor_idx,
158 max_size - rec->part_number_idx,
159 rec->strings + rec->part_number_idx);
160 snprintf(vendor, 255, "%.*s", max_size - rec->vendor_idx,
161 rec->strings + rec->vendor_idx);
Ollie Lho184a4042005-11-26 21:55:36 +0000162 snprintf(part, 255, "%.*s", max_size - rec->part_number_idx,
Uwe Hermanna7e05482007-05-09 10:17:44 +0000163 rec->strings + rec->part_number_idx);
Ollie Lho184a4042005-11-26 21:55:36 +0000164
Uwe Hermanna7e05482007-05-09 10:17:44 +0000165 if (lb_part) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000166 msg_pdbg("Overwritten by command line, vendor ID: %s, part ID: %s.\n", lb_vendor, lb_part);
Ollie Lho184a4042005-11-26 21:55:36 +0000167 } else {
Carl-Daniel Hailfingerbc25f942009-07-30 13:30:17 +0000168 partvendor_from_cbtable = 1;
Uwe Hermanna7e05482007-05-09 10:17:44 +0000169 lb_part = strdup(part);
170 lb_vendor = strdup(vendor);
Ollie Lho184a4042005-11-26 21:55:36 +0000171 }
172}
173
174static struct lb_record *next_record(struct lb_record *rec)
175{
176 return (struct lb_record *)(((char *)rec) + rec->size);
177}
178
Uwe Hermanna7e05482007-05-09 10:17:44 +0000179static void search_lb_records(struct lb_record *rec, struct lb_record *last,
180 unsigned long addr)
Ollie Lho184a4042005-11-26 21:55:36 +0000181{
182 struct lb_record *next;
183 int count;
184 count = 0;
185
Uwe Hermanna7e05482007-05-09 10:17:44 +0000186 for (next = next_record(rec); (rec < last) && (next <= last);
187 rec = next, addr += rec->size) {
Ollie Lho184a4042005-11-26 21:55:36 +0000188 next = next_record(rec);
189 count++;
Uwe Hermanna7e05482007-05-09 10:17:44 +0000190 if (rec->tag == LB_TAG_MAINBOARD) {
191 find_mainboard(rec, addr);
Ollie Lho184a4042005-11-26 21:55:36 +0000192 break;
193 }
194 }
195}
196
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000197#define BYTES_TO_MAP (1024*1024)
Stefan Reinauere3f3e2e2008-01-18 15:33:10 +0000198int coreboot_init(void)
Ollie Lho184a4042005-11-26 21:55:36 +0000199{
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000200 uint8_t *table_area;
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000201 unsigned long addr, start;
Ollie Lho184a4042005-11-26 21:55:36 +0000202 struct lb_header *lb_table;
203 struct lb_record *rec, *last;
Uwe Hermanna7e05482007-05-09 10:17:44 +0000204
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000205#ifdef __DARWIN__
Carl-Daniel Hailfingerf992c192010-10-06 23:16:10 +0000206 /* This is a hack. DirectHW fails to map physical address 0x00000000.
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000207 * Why?
208 */
209 start = 0x400;
210#else
211 start = 0x0;
212#endif
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000213 table_area = physmap_try_ro("low megabyte", start, BYTES_TO_MAP - start);
Patrick Georgied7a9642010-09-25 22:53:44 +0000214 if (ERROR_PTR == table_area) {
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000215 msg_perr("Failed getting access to coreboot low tables.\n");
216 return -1;
217 }
Stefan Reinauerf79edb92009-01-26 01:23:31 +0000218
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000219 lb_table = find_lb_table(table_area, 0x00000, 0x1000);
Ollie Lho184a4042005-11-26 21:55:36 +0000220 if (!lb_table)
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000221 lb_table = find_lb_table(table_area, 0xf0000 - start, BYTES_TO_MAP - start);
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000222 if (lb_table) {
223 struct lb_forward *forward = (struct lb_forward *)
224 (((char *)lb_table) + lb_table->header_bytes);
225 if (forward->tag == LB_TAG_FORWARD) {
226 start = forward->forward;
Uwe Hermann7b2969b2009-04-15 10:52:49 +0000227 start &= ~(getpagesize() - 1);
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000228 physunmap(table_area, BYTES_TO_MAP);
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000229 table_area = physmap_try_ro("high tables", start, BYTES_TO_MAP);
Patrick Georgied7a9642010-09-25 22:53:44 +0000230 if (ERROR_PTR == table_area) {
Carl-Daniel Hailfingerbaaffe02010-02-02 11:09:03 +0000231 msg_perr("Failed getting access to coreboot "
232 "high tables.\n");
233 return -1;
234 }
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000235 lb_table = find_lb_table(table_area, 0x00000, 0x1000);
236 }
237 }
238
Peter Stuge2dc3aaa2009-01-26 00:15:56 +0000239 if (!lb_table) {
Sean Nelson316a29f2010-05-07 20:09:04 +0000240 msg_pinfo("No coreboot table found.\n");
Ollie Lho184a4042005-11-26 21:55:36 +0000241 return -1;
242 }
Uwe Hermannffec5f32007-08-23 16:08:21 +0000243
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000244 addr = ((char *)lb_table) - ((char *)table_area) + start;
Sean Nelson316a29f2010-05-07 20:09:04 +0000245 msg_pinfo("coreboot table found at 0x%lx.\n",
Stefan Reinauer2d853bb2009-03-17 14:39:25 +0000246 (unsigned long)lb_table - (unsigned long)table_area + start);
Peter Stuge2dc3aaa2009-01-26 00:15:56 +0000247 rec = (struct lb_record *)(((char *)lb_table) + lb_table->header_bytes);
248 last = (struct lb_record *)(((char *)rec) + lb_table->table_bytes);
Sean Nelson316a29f2010-05-07 20:09:04 +0000249 msg_pdbg("coreboot header(%d) checksum: %04x table(%d) checksum: %04x entries: %d\n",
Peter Stuge2dc3aaa2009-01-26 00:15:56 +0000250 lb_table->header_bytes, lb_table->header_checksum,
251 lb_table->table_bytes, lb_table->table_checksum,
252 lb_table->table_entries);
253 search_lb_records(rec, last, addr + lb_table->header_bytes);
254
Ollie Lho184a4042005-11-26 21:55:36 +0000255 return 0;
256}