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