2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
5 * Copyright (C) 2009 coresystems GmbH
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <libpayload-config.h>
32 #include <libpayload.h>
33 #include <coreboot_tables.h>
36 * Some of this is x86 specific, and the rest of it is generic. Right now,
37 * since we only support x86, we'll avoid trying to make lots of infrastructure
38 * we don't need. If in the future, we want to use coreboot on some other
39 * architecture, then take out the generic parsing code and move it elsewhere.
42 /* === Parsing code === */
43 /* This is the generic parsing code. */
45 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
47 struct cb_memory *mem = (struct cb_memory *)ptr;
48 int count = MEM_RANGE_COUNT(mem);
51 if (count > SYSINFO_MAX_MEM_RANGES)
52 count = SYSINFO_MAX_MEM_RANGES;
54 info->n_memranges = 0;
56 for (i = 0; i < count; i++) {
57 struct cb_memory_range *range =
58 (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
61 if (range->type != CB_MEM_RAM)
65 info->memrange[info->n_memranges].base =
66 UNPACK_CB64(range->start);
68 info->memrange[info->n_memranges].size =
69 UNPACK_CB64(range->size);
71 info->memrange[info->n_memranges].type = range->type;
77 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
79 struct cb_serial *ser = (struct cb_serial *)ptr;
80 info->ser_ioport = ser->ioport;
84 static void cb_parse_optiontable(unsigned char *ptr, struct sysinfo_t *info)
86 info->option_table = (struct cb_cmos_option_table *)ptr;
89 static void cb_parse_checksum(unsigned char *ptr, struct sysinfo_t *info)
91 struct cb_cmos_checksum *cmos_cksum = (struct cb_cmos_checksum *)ptr;
92 info->cmos_range_start = cmos_cksum->range_start;
93 info->cmos_range_end = cmos_cksum->range_end;
94 info->cmos_checksum_location = cmos_cksum->location;
98 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
100 struct cb_header *header;
101 unsigned char *ptr = (unsigned char *)addr;
104 for (i = 0; i < len; i += 16, ptr += 16) {
105 header = (struct cb_header *)ptr;
106 if (!strncmp((const char *)header->signature, "LBIO", 4))
110 /* We walked the entire space and didn't find anything. */
114 if (!header->table_bytes)
117 /* Make sure the checksums match. */
118 if (ipchksum((u16 *) header, sizeof(*header)) != 0)
121 if (ipchksum((u16 *) (ptr + sizeof(*header)),
122 header->table_bytes) != header->table_checksum)
125 /* Now, walk the tables. */
126 ptr += header->header_bytes;
128 for (i = 0; i < header->table_entries; i++) {
129 struct cb_record *rec = (struct cb_record *)ptr;
131 /* We only care about a few tags here (maybe more later). */
134 return cb_parse_header((void *)(unsigned long)((struct cb_forward *)rec)->forward, len, info);
137 cb_parse_memory(ptr, info);
140 cb_parse_serial(ptr, info);
143 case CB_TAG_CMOS_OPTION_TABLE:
144 cb_parse_optiontable(ptr, info);
146 case CB_TAG_OPTION_CHECKSUM:
147 cb_parse_checksum(ptr, info);
158 /* == Architecture specific == */
159 /* This is the x86 specific stuff. */
161 int get_coreboot_info(struct sysinfo_t *info)
163 int ret = cb_parse_header(phys_to_virt(0x00000000), 0x1000, info);
166 ret = cb_parse_header(phys_to_virt(0x000f0000), 0x1000, info);
168 return (ret == 1) ? 0 : -1;