xref: /openbmc/u-boot/arch/x86/cpu/coreboot/tables.c (revision 83d290c56fab2d38cd1ab4c4cc7099559c1d5046)
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