LXR uboot/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 */
  19struct 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
  31static 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
  58static 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
  64static 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
  72static 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
  84static 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
  92static 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
  97static 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
 102static void cb_parse_framebuffer(unsigned char *ptr, struct sysinfo_t *info)
 103{
 104        info->framebuffer = (struct cb_framebuffer *)ptr;
 105}
 106
 107static void cb_parse_string(unsigned char *ptr, char **info)
 108{
 109        *info = (char *)((struct cb_string *)ptr)->string;
 110}
 111
 112static 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
 225int 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