LXR uboot/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-coreboot/ipchecksum.h>
  12#include <asm/arch-coreboot/sysinfo.h>
  13#include <asm/arch-coreboot/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 */
  21struct 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
  33static 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
  60static 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
  66static 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
  74static 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
  86static 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
  94static 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
  99static 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
 104static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
 105{
 106        info->framebuffer = (struct cb_framebuffer *)ptr;
 107}
 108
 109static void cb_parse_string(unsigned char *ptr, char **info)
 110{
 111        *info = (char *)((struct cb_string *)ptr)->string;
 112}
 113
 114static 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
 227int 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}
 236