2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <libpayload.h>
32 #include <coreboot_tables.h>
35 * Some of this is x86 specific, and the rest of it is generic. Right now,
36 * since we only support x86, we'll avoid trying to make lots of infrastructure
37 * we don't need. If in the future, we want to use coreboot on some other
38 * architecture, then take out the generic parsing code and move it elsewhere.
41 /* === Parsing code === */
42 /* This is the generic parsing code. */
44 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
46 struct cb_memory *mem = (struct cb_memory *)ptr;
47 int count = MEM_RANGE_COUNT(mem);
50 if (count > SYSINFO_MAX_MEM_RANGES)
51 count = SYSINFO_MAX_MEM_RANGES;
53 info->n_memranges = 0;
55 for (i = 0; i < count; i++) {
56 struct cb_memory_range *range =
57 (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
59 if (range->type != CB_MEM_RAM)
62 info->memrange[info->n_memranges].base =
63 UNPACK_CB64(range->start);
65 info->memrange[info->n_memranges].size =
66 UNPACK_CB64(range->size);
72 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
74 struct cb_serial *ser = (struct cb_serial *)ptr;
75 info->ser_ioport = ser->ioport;
78 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
80 struct cb_header *header;
81 unsigned char *ptr = (unsigned char *)addr;
84 for (i = 0; i < len; i += 16, ptr += 16) {
85 header = (struct cb_header *)ptr;
86 if (!strncmp(header->signature, "LBIO", 4))
90 /* We walked the entire space and didn't find anything. */
94 if (!header->table_bytes)
97 /* Make sure the checksums match. */
98 if (ipchksum((uint16_t *) header, sizeof(*header)) != 0)
101 if (ipchksum((uint16_t *) (ptr + sizeof(*header)),
102 header->table_bytes) != header->table_checksum)
105 /* Now, walk the tables. */
106 ptr += header->header_bytes;
108 for (i = 0; i < header->table_entries; i++) {
109 struct cb_record *rec = (struct cb_record *)ptr;
111 /* We only care about a few tags here (maybe more later). */
114 cb_parse_memory(ptr, info);
117 cb_parse_serial(ptr, info);
127 /* == Architecture specific == */
128 /* This is the x86 specific stuff. */
130 int get_coreboot_info(struct sysinfo_t *info)
132 int ret = cb_parse_header((void *)0x0, 0x1000, info);
135 ret = cb_parse_header((void *)0xf0000, 0x1000, info);
137 return (ret == 1) ? 0 : -1;