arch/x86/cpu/coreboot/tables.c

   1 /*
   2  * This file is part of the libpayload project.
   3  *
   4  * Copyright (C) 2008 Advanced Micro Devices, Inc.
   5  * Copyright (C) 2009 coresystems GmbH
   6  *
   7  * SPDX-License-Identifier:     BSD-3-Clause
   8  */
   9
  10 #include <common.h>
  11 #include <asm/arch/ipchecksum.h>
  12 #include <asm/arch/sysinfo.h>
  13 #include <asm/arch/tables.h>
  14
  15 /*
  16  * This needs to be in the .data section so that it's copied over during
  17  * relocation. By default it's put in the .bss section which is simply filled
  18  * with zeroes when transitioning from "ROM", which is really RAM, to other
  19  * RAM.
  20  */
  21 struct sysinfo_t lib_sysinfo __attribute__((section(".data")));
  22
  23 /*
  24  * Some of this is x86 specific, and the rest of it is generic. Right now,
  25  * since we only support x86, we'll avoid trying to make lots of infrastructure
  26  * we don't need. If in the future, we want to use coreboot on some other
  27  * architecture, then take out the generic parsing code and move it elsewhere.
  28  */
  29
  30 /* === Parsing code === */
  31 /* This is the generic parsing code. */
  32
  33 static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info)
  34 {
  35         struct cb_memory *mem = (struct cb_memory *)ptr;
  36         int count = MEM_RANGE_COUNT(mem);
  37         int i;
  38
  39         if (count > SYSINFO_MAX_MEM_RANGES)
  40                 count = SYSINFO_MAX_MEM_RANGES;
  41
  42         info->n_memranges = 0;
  43
  44         for (i = 0; i < count; i++) {
  45                 struct cb_memory_range *range =
  46                     (struct cb_memory_range *)MEM_RANGE_PTR(mem, i);
  47
  48                 info->memrange[info->n_memranges].base =
  49                     UNPACK_CB64(range->start);
  50
  51                 info->memrange[info->n_memranges].size =
  52                     UNPACK_CB64(range->size);
  53
  54                 info->memrange[info->n_memranges].type = range->type;
  55
  56                 info->n_memranges++;
  57         }
  58 }
  59
  60 static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info)
  61 {
  62         struct cb_serial *ser = (struct cb_serial *)ptr;
  63         info->serial = ser;
  64 }
  65
  66 static void cb_parse_vbnv(unsigned char *ptr, struct sysinfo_t *info)
  67 {
  68         struct cb_vbnv *vbnv = (struct cb_vbnv *)ptr;
  69
  70         info->vbnv_start = vbnv->vbnv_start;
  71         info->vbnv_size = vbnv->vbnv_size;
  72 }
  73
  74 static void cb_parse_gpios(unsigned char *ptr, struct sysinfo_t *info)
  75 {
  76         int i;
  77         struct cb_gpios *gpios = (struct cb_gpios *)ptr;
  78
  79         info->num_gpios = (gpios->count < SYSINFO_MAX_GPIOS) ?
  80                                 (gpios->count) : SYSINFO_MAX_GPIOS;
  81
  82         for (i = 0; i < info->num_gpios; i++)
  83                 info->gpios[i] = gpios->gpios[i];
  84 }
  85
  86 static void cb_parse_vdat(unsigned char *ptr, struct sysinfo_t *info)
  87 {
  88         struct cb_vdat *vdat = (struct cb_vdat *) ptr;
  89
  90         info->vdat_addr = vdat->vdat_addr;
  91         info->vdat_size = vdat->vdat_size;
  92 }
  93
  94 static void cb_parse_tstamp(unsigned char *ptr, struct sysinfo_t *info)
  95 {
  96         info->tstamp_table = ((struct cb_cbmem_tab *)ptr)->cbmem_tab;
  97 }
  98
  99 static void cb_parse_cbmem_cons(unsigned char *ptr, struct sysinfo_t *info)
 100 {
 101         info->cbmem_cons = ((struct cb_cbmem_tab *)ptr)->cbmem_tab;
 102 }
 103
 104 static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
 105 {
 106         info->framebuffer = (struct cb_framebuffer *)ptr;
 107 }
 108
 109 static void cb_parse_string(unsigned char *ptr, char **info)
 110 {
 111         *info = (char *)((struct cb_string *)ptr)->string;
 112 }
 113
 114 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
 115 {
 116         struct cb_header *header;
 117         unsigned char *ptr = (unsigned char *)addr;
 118         int i;
 119
 120         for (i = 0; i < len; i += 16, ptr += 16) {
 121                 header = (struct cb_header *)ptr;
 122                 if (!strncmp((const char *)header->signature, "LBIO", 4))
 123                         break;
 124         }
 125
 126         /* We walked the entire space and didn't find anything. */
 127         if (i >= len)
 128                 return -1;
 129
 130         if (!header->table_bytes)
 131                 return 0;
 132
 133         /* Make sure the checksums match. */
 134         if (ipchksum((u16 *) header, sizeof(*header)) != 0)
 135                 return -1;
 136
 137         if (ipchksum((u16 *) (ptr + sizeof(*header)),
 138                      header->table_bytes) != header->table_checksum)
 139                 return -1;
 140
 141         /* Now, walk the tables. */
 142         ptr += header->header_bytes;
 143
 144         /* Inintialize some fields to sentinel values. */
 145         info->vbnv_start = info->vbnv_size = (uint32_t)(-1);
 146
 147         for (i = 0; i < header->table_entries; i++) {
 148                 struct cb_record *rec = (struct cb_record *)ptr;
 149
 150                 /* We only care about a few tags here (maybe more later). */
 151                 switch (rec->tag) {
 152                 case CB_TAG_FORWARD:
 153                         return cb_parse_header(
 154                                 (void *)(unsigned long)
 155                                 ((struct cb_forward *)rec)->forward,
 156                                 len, info);
 157                         continue;
 158                 case CB_TAG_MEMORY:
 159                         cb_parse_memory(ptr, info);
 160                         break;
 161                 case CB_TAG_SERIAL:
 162                         cb_parse_serial(ptr, info);
 163                         break;
 164                 case CB_TAG_VERSION:
 165                         cb_parse_string(ptr, &info->version);
 166                         break;
 167                 case CB_TAG_EXTRA_VERSION:
 168                         cb_parse_string(ptr, &info->extra_version);
 169                         break;
 170                 case CB_TAG_BUILD:
 171                         cb_parse_string(ptr, &info->build);
 172                         break;
 173                 case CB_TAG_COMPILE_TIME:
 174                         cb_parse_string(ptr, &info->compile_time);
 175                         break;
 176                 case CB_TAG_COMPILE_BY:
 177                         cb_parse_string(ptr, &info->compile_by);
 178                         break;
 179                 case CB_TAG_COMPILE_HOST:
 180                         cb_parse_string(ptr, &info->compile_host);
 181                         break;
 182                 case CB_TAG_COMPILE_DOMAIN:
 183                         cb_parse_string(ptr, &info->compile_domain);
 184                         break;
 185                 case CB_TAG_COMPILER:
 186                         cb_parse_string(ptr, &info->compiler);
 187                         break;
 188                 case CB_TAG_LINKER:
 189                         cb_parse_string(ptr, &info->linker);
 190                         break;
 191                 case CB_TAG_ASSEMBLER:
 192                         cb_parse_string(ptr, &info->assembler);
 193                         break;
 194                 /*
 195                  * FIXME we should warn on serial if coreboot set up a
 196                  * framebuffer buf the payload does not know about it.
 197                  */
 198                 case CB_TAG_FRAMEBUFFER:
 199                         cb_parse_framebuffer(ptr, info);
 200                         break;
 201                 case CB_TAG_GPIO:
 202                         cb_parse_gpios(ptr, info);
 203                         break;
 204                 case CB_TAG_VDAT:
 205                         cb_parse_vdat(ptr, info);
 206                         break;
 207                 case CB_TAG_TIMESTAMPS:
 208                         cb_parse_tstamp(ptr, info);
 209                         break;
 210                 case CB_TAG_CBMEM_CONSOLE:
 211                         cb_parse_cbmem_cons(ptr, info);
 212                         break;
 213                 case CB_TAG_VBNV:
 214                         cb_parse_vbnv(ptr, info);
 215                         break;
 216                 }
 217
 218                 ptr += rec->size;
 219         }
 220
 221         return 1;
 222 }
 223
 224 /* == Architecture specific == */
 225 /* This is the x86 specific stuff. */
 226
 227 int get_coreboot_info(struct sysinfo_t *info)
 228 {
 229         int ret = cb_parse_header((void *)0x00000000, 0x1000, info);
 230
 231         if (ret != 1)
 232                 ret = cb_parse_header((void *)0x000f0000, 0x1000, info);
 233
 234         return (ret == 1) ? 0 : -1;
 235 }