1 // SPDX-License-Identifier: BSD-3-Clause
2 /*
3 * This file is part of the libpayload project.
4 *
5 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Copyright (C) 2009 coresystems GmbH
7 */
8
9 #include <common.h>
10 #include <net.h>
11 #include <asm/arch/sysinfo.h>
12
13 /*
14 * This needs to be in the .data section so that it's copied over during
15 * relocation. By default it's put in the .bss section which is simply filled
16 * with zeroes when transitioning from "ROM", which is really RAM, to other
17 * RAM.
18 */
19 struct sysinfo_t lib_sysinfo __attribute__((section(".data")));
20
21 /*
22 * Some of this is x86 specific, and the rest of it is generic. Right now,
23 * since we only support x86, we'll avoid trying to make lots of infrastructure
24 * we don't need. If in the future, we want to use coreboot on some other
25 * architecture, then take out the generic parsing code and move it elsewhere.
26 */
27
28 /* === Parsing code === */
29 /* This is the generic parsing code. */
30
cb_parse_memory(unsigned char * ptr,struct sysinfo_t * info)31 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
32 {
33 struct cb_memory *mem = (struct cb_memory *)ptr;
34 int count = MEM_RANGE_COUNT(mem);
35 int i;
36
37 if (count > SYSINFO_MAX_MEM_RANGES)
38 count = SYSINFO_MAX_MEM_RANGES;
39
40 info->n_memranges = 0;
41
42 for (i = 0; i < count; i++) {
43 struct cb_memory_range *range =
44 (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
45
46 info->memrange[info->n_memranges].base =
47 UNPACK_CB64(range->start);
48
49 info->memrange[info->n_memranges].size =
50 UNPACK_CB64(range->size);
51
52 info->memrange[info->n_memranges].type = range->type;
53
54 info->n_memranges++;
55 }
56 }
57
cb_parse_serial(unsigned char * ptr,struct sysinfo_t * info)58 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
59 {
60 struct cb_serial *ser = (struct cb_serial *)ptr;
61 info->serial = ser;
62 }
63
cb_parse_vbnv(unsigned char * ptr,struct sysinfo_t * info)64 static void cb_parse_vbnv(unsigned char *ptr, struct sysinfo_t *info)
65 {
66 struct cb_vbnv *vbnv = (struct cb_vbnv *)ptr;
67
68 info->vbnv_start = vbnv->vbnv_start;
69 info->vbnv_size = vbnv->vbnv_size;
70 }
71
cb_parse_gpios(unsigned char * ptr,struct sysinfo_t * info)72 static void cb_parse_gpios(unsigned char *ptr, struct sysinfo_t *info)
73 {
74 int i;
75 struct cb_gpios *gpios = (struct cb_gpios *)ptr;
76
77 info->num_gpios = (gpios->count < SYSINFO_MAX_GPIOS) ?
78 (gpios->count) : SYSINFO_MAX_GPIOS;
79
80 for (i = 0; i < info->num_gpios; i++)
81 info->gpios[i] = gpios->gpios[i];
82 }
83
cb_parse_vdat(unsigned char * ptr,struct sysinfo_t * info)84 static void cb_parse_vdat(unsigned char *ptr, struct sysinfo_t *info)
85 {
86 struct cb_vdat *vdat = (struct cb_vdat *) ptr;
87
88 info->vdat_addr = vdat->vdat_addr;
89 info->vdat_size = vdat->vdat_size;
90 }
91
cb_parse_tstamp(unsigned char * ptr,struct sysinfo_t * info)92 static void cb_parse_tstamp(unsigned char *ptr, struct sysinfo_t *info)
93 {
94 info->tstamp_table = ((struct cb_cbmem_tab *)ptr)->cbmem_tab;
95 }
96
cb_parse_cbmem_cons(unsigned char * ptr,struct sysinfo_t * info)97 static void cb_parse_cbmem_cons(unsigned char *ptr, struct sysinfo_t *info)
98 {
99 info->cbmem_cons = ((struct cb_cbmem_tab *)ptr)->cbmem_tab;
100 }
101
cb_parse_framebuffer(unsigned char * ptr,struct sysinfo_t * info)102 static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
103 {
104 info->framebuffer = (struct cb_framebuffer *)ptr;
105 }
106
cb_parse_string(unsigned char * ptr,char ** info)107 static void cb_parse_string(unsigned char *ptr, char **info)
108 {
109 *info = (char *)((struct cb_string *)ptr)->string;
110 }
111
cb_parse_header(void * addr,int len,struct sysinfo_t * info)112 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
113 {
114 struct cb_header *header;
115 unsigned char *ptr = (unsigned char *)addr;
116 int i;
117
118 for (i = 0; i < len; i += 16, ptr += 16) {
119 header = (struct cb_header *)ptr;
120 if (!strncmp((const char *)header->signature, "LBIO", 4))
121 break;
122 }
123
124 /* We walked the entire space and didn't find anything. */
125 if (i >= len)
126 return -1;
127
128 if (!header->table_bytes)
129 return 0;
130
131 /* Make sure the checksums match. */
132 if (!ip_checksum_ok(header, sizeof(*header)))
133 return -1;
134
135 if (compute_ip_checksum(ptr + sizeof(*header), header->table_bytes) !=
136 header->table_checksum)
137 return -1;
138
139 /* Now, walk the tables. */
140 ptr += header->header_bytes;
141
142 /* Inintialize some fields to sentinel values. */
143 info->vbnv_start = info->vbnv_size = (uint32_t)(-1);
144
145 for (i = 0; i < header->table_entries; i++) {
146 struct cb_record *rec = (struct cb_record *)ptr;
147
148 /* We only care about a few tags here (maybe more later). */
149 switch (rec->tag) {
150 case CB_TAG_FORWARD:
151 return cb_parse_header(
152 (void *)(unsigned long)
153 ((struct cb_forward *)rec)->forward,
154 len, info);
155 continue;
156 case CB_TAG_MEMORY:
157 cb_parse_memory(ptr, info);
158 break;
159 case CB_TAG_SERIAL:
160 cb_parse_serial(ptr, info);
161 break;
162 case CB_TAG_VERSION:
163 cb_parse_string(ptr, &info->version);
164 break;
165 case CB_TAG_EXTRA_VERSION:
166 cb_parse_string(ptr, &info->extra_version);
167 break;
168 case CB_TAG_BUILD:
169 cb_parse_string(ptr, &info->build);
170 break;
171 case CB_TAG_COMPILE_TIME:
172 cb_parse_string(ptr, &info->compile_time);
173 break;
174 case CB_TAG_COMPILE_BY:
175 cb_parse_string(ptr, &info->compile_by);
176 break;
177 case CB_TAG_COMPILE_HOST:
178 cb_parse_string(ptr, &info->compile_host);
179 break;
180 case CB_TAG_COMPILE_DOMAIN:
181 cb_parse_string(ptr, &info->compile_domain);
182 break;
183 case CB_TAG_COMPILER:
184 cb_parse_string(ptr, &info->compiler);
185 break;
186 case CB_TAG_LINKER:
187 cb_parse_string(ptr, &info->linker);
188 break;
189 case CB_TAG_ASSEMBLER:
190 cb_parse_string(ptr, &info->assembler);
191 break;
192 /*
193 * FIXME we should warn on serial if coreboot set up a
194 * framebuffer buf the payload does not know about it.
195 */
196 case CB_TAG_FRAMEBUFFER:
197 cb_parse_framebuffer(ptr, info);
198 break;
199 case CB_TAG_GPIO:
200 cb_parse_gpios(ptr, info);
201 break;
202 case CB_TAG_VDAT:
203 cb_parse_vdat(ptr, info);
204 break;
205 case CB_TAG_TIMESTAMPS:
206 cb_parse_tstamp(ptr, info);
207 break;
208 case CB_TAG_CBMEM_CONSOLE:
209 cb_parse_cbmem_cons(ptr, info);
210 break;
211 case CB_TAG_VBNV:
212 cb_parse_vbnv(ptr, info);
213 break;
214 }
215
216 ptr += rec->size;
217 }
218
219 return 1;
220 }
221
222 /* == Architecture specific == */
223 /* This is the x86 specific stuff. */
224
get_coreboot_info(struct sysinfo_t * info)225 int get_coreboot_info(struct sysinfo_t *info)
226 {
227 int ret = cb_parse_header((void *)0x00000000, 0x1000, info);
228
229 if (ret != 1)
230 ret = cb_parse_header((void *)0x000f0000, 0x1000, info);
231
232 return (ret == 1) ? 0 : -1;
233 }
234