arch/x86/cpu/coreboot/tables.c

   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
  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
  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
  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
  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
  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
  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
  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
 102 static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
 103 {
 104         info->framebuffer = (struct cb_framebuffer *)ptr;
 105 }
 106
 107 static void cb_parse_string(unsigned char *ptr, char **info)
 108 {
 109         *info = (char *)((struct cb_string *)ptr)->string;
 110 }
 111
 112 __weak void cb_parse_unhandled(u32 tag, unsigned char *ptr)
 113 {
 114 }
 115
 116 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 117 {
 118         struct cb_header *header;
 119         unsigned char *ptr = (unsigned char *)addr;
 120         int i;
 121
 122         for (i = 0; i < len; i += 16, ptr += 16) {
 123                 header = (struct cb_header *)ptr;
 124                 if (!strncmp((const char *)header->signature, "LBIO", 4))
 125                         break;
 126         }
 127
 128         /* We walked the entire space and didn't find anything. */
 129         if (i >= len)
 130                 return -1;
 131
 132         if (!header->table_bytes)
 133                 return 0;
 134
 135         /* Make sure the checksums match. */
 136         if (!ip_checksum_ok(header, sizeof(*header)))
 137                 return -1;
 138
 139         if (compute_ip_checksum(ptr + sizeof(*header), header->table_bytes) !=
 140             header->table_checksum)
 141                 return -1;
 142
 143         /* Now, walk the tables. */
 144         ptr += header->header_bytes;
 145
 146         /* Inintialize some fields to sentinel values. */
 147         info->vbnv_start = info->vbnv_size = (uint32_t)(-1);
 148
 149         for (i = 0; i < header->table_entries; i++) {
 150                 struct cb_record *rec = (struct cb_record *)ptr;
 151
 152                 /* We only care about a few tags here (maybe more later). */
 153                 switch (rec->tag) {
 154                 case CB_TAG_FORWARD:
 155                         return cb_parse_header(
 156                                 (void *)(unsigned long)
 157                                 ((struct cb_forward *)rec)->forward,
 158                                 len, info);
 159                         continue;
 160                 case CB_TAG_MEMORY:
 161                         cb_parse_memory(ptr, info);
 162                         break;
 163                 case CB_TAG_SERIAL:
 164                         cb_parse_serial(ptr, info);
 165                         break;
 166                 case CB_TAG_VERSION:
 167                         cb_parse_string(ptr, &info->version);
 168                         break;
 169                 case CB_TAG_EXTRA_VERSION:
 170                         cb_parse_string(ptr, &info->extra_version);
 171                         break;
 172                 case CB_TAG_BUILD:
 173                         cb_parse_string(ptr, &info->build);
 174                         break;
 175                 case CB_TAG_COMPILE_TIME:
 176                         cb_parse_string(ptr, &info->compile_time);
 177                         break;
 178                 case CB_TAG_COMPILE_BY:
 179                         cb_parse_string(ptr, &info->compile_by);
 180                         break;
 181                 case CB_TAG_COMPILE_HOST:
 182                         cb_parse_string(ptr, &info->compile_host);
 183                         break;
 184                 case CB_TAG_COMPILE_DOMAIN:
 185                         cb_parse_string(ptr, &info->compile_domain);
 186                         break;
 187                 case CB_TAG_COMPILER:
 188                         cb_parse_string(ptr, &info->compiler);
 189                         break;
 190                 case CB_TAG_LINKER:
 191                         cb_parse_string(ptr, &info->linker);
 192                         break;
 193                 case CB_TAG_ASSEMBLER:
 194                         cb_parse_string(ptr, &info->assembler);
 195                         break;
 196                 /*
 197                  * FIXME we should warn on serial if coreboot set up a
 198                  * framebuffer buf the payload does not know about it.
 199                  */
 200                 case CB_TAG_FRAMEBUFFER:
 201                         cb_parse_framebuffer(ptr, info);
 202                         break;
 203                 case CB_TAG_GPIO:
 204                         cb_parse_gpios(ptr, info);
 205                         break;
 206                 case CB_TAG_VDAT:
 207                         cb_parse_vdat(ptr, info);
 208                         break;
 209                 case CB_TAG_TIMESTAMPS:
 210                         cb_parse_tstamp(ptr, info);
 211                         break;
 212                 case CB_TAG_CBMEM_CONSOLE:
 213                         cb_parse_cbmem_cons(ptr, info);
 214                         break;
 215                 case CB_TAG_VBNV:
 216                         cb_parse_vbnv(ptr, info);
 217                         break;
 218                 default:
 219                         cb_parse_unhandled(rec->tag, ptr);
 220                         break;
 221                 }
 222
 223                 ptr += rec->size;
 224         }
 225
 226         return 1;
 227 }
 228
 229 /* == Architecture specific == */
 230 /* This is the x86 specific stuff. */
 231
 232 int get_coreboot_info(struct sysinfo_t *info)
 233 {
 234         int ret = cb_parse_header((void *)0x00000000, 0x1000, info);
 235
 236         if (ret != 1)
 237                 ret = cb_parse_header((void *)0x000f0000, 0x1000, info);
 238
 239         return (ret == 1) ? 0 : -1;
 240 }