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 <asm/arch-coreboot/ipchecksum.h>
32 #include <asm/arch-coreboot/sysinfo.h>
33 #include <asm/arch-coreboot/tables.h>
36 * This needs to be in the .data section so that it's copied over during
37 * relocation. By default it's put in the .bss section which is simply filled
38 * with zeroes when transitioning from "ROM", which is really RAM, to other
41 struct sysinfo_t lib_sysinfo __attribute__((section(".data")));
44 * Some of this is x86 specific, and the rest of it is generic. Right now,
45 * since we only support x86, we'll avoid trying to make lots of infrastructure
46 * we don't need. If in the future, we want to use coreboot on some other
47 * architecture, then take out the generic parsing code and move it elsewhere.
50 /* === Parsing code === */
51 /* This is the generic parsing code. */
53 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
55 struct cb_memory *mem = (struct cb_memory *)ptr;
56 int count = MEM_RANGE_COUNT(mem);
59 if (count > SYSINFO_MAX_MEM_RANGES)
60 count = SYSINFO_MAX_MEM_RANGES;
62 info->n_memranges = 0;
64 for (i = 0; i < count; i++) {
65 struct cb_memory_range *range =
66 (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
68 info->memrange[info->n_memranges].base =
69 UNPACK_CB64(range->start);
71 info->memrange[info->n_memranges].size =
72 UNPACK_CB64(range->size);
74 info->memrange[info->n_memranges].type = range->type;
80 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
82 struct cb_serial *ser = (struct cb_serial *)ptr;
83 if (ser->type != CB_SERIAL_TYPE_IO_MAPPED)
85 info->ser_ioport = ser->baseaddr;
88 static void cb_parse_optiontable(unsigned char *ptr, struct sysinfo_t *info)
90 info->option_table = (struct cb_cmos_option_table *)ptr;
93 static void cb_parse_checksum(unsigned char *ptr, struct sysinfo_t *info)
95 struct cb_cmos_checksum *cmos_cksum = (struct cb_cmos_checksum *)ptr;
96 info->cmos_range_start = cmos_cksum->range_start;
97 info->cmos_range_end = cmos_cksum->range_end;
98 info->cmos_checksum_location = cmos_cksum->location;
101 static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
103 info->framebuffer = (struct cb_framebuffer *)ptr;
106 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
108 struct cb_header *header;
109 unsigned char *ptr = (unsigned char *)addr;
112 for (i = 0; i < len; i += 16, ptr += 16) {
113 header = (struct cb_header *)ptr;
114 if (!strncmp((const char *)header->signature, "LBIO", 4))
118 /* We walked the entire space and didn't find anything. */
122 if (!header->table_bytes)
125 /* Make sure the checksums match. */
126 if (ipchksum((u16 *) header, sizeof(*header)) != 0)
129 if (ipchksum((u16 *) (ptr + sizeof(*header)),
130 header->table_bytes) != header->table_checksum)
133 /* Now, walk the tables. */
134 ptr += header->header_bytes;
136 for (i = 0; i < header->table_entries; i++) {
137 struct cb_record *rec = (struct cb_record *)ptr;
139 /* We only care about a few tags here (maybe more later). */
142 return cb_parse_header(
143 (void *)(unsigned long)
144 ((struct cb_forward *)rec)->forward,
148 cb_parse_memory(ptr, info);
151 cb_parse_serial(ptr, info);
153 case CB_TAG_CMOS_OPTION_TABLE:
154 cb_parse_optiontable(ptr, info);
156 case CB_TAG_OPTION_CHECKSUM:
157 cb_parse_checksum(ptr, info);
160 * FIXME we should warn on serial if coreboot set up a
161 * framebuffer buf the payload does not know about it.
163 case CB_TAG_FRAMEBUFFER:
164 cb_parse_framebuffer(ptr, info);
174 /* == Architecture specific == */
175 /* This is the x86 specific stuff. */
177 /* Assume no translation or that memory is identity mapped. */
178 static void *phys_to_virt(unsigned long virt)
180 return (void *)(uintptr_t)virt;
183 int get_coreboot_info(struct sysinfo_t *info)
185 int ret = cb_parse_header(phys_to_virt(0x00000000), 0x1000, info);
188 ret = cb_parse_header(phys_to_virt(0x000f0000), 0x1000, info);
190 return (ret == 1) ? 0 : -1;