payloads/libpayload/arch/x86/coreboot.c

   1 /*
   2  *
   3  * Copyright (C) 2008 Advanced Micro Devices, Inc.
   4  * Copyright (C) 2009 coresystems GmbH
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <libpayload-config.h>
  31 #include <libpayload.h>
  32 #include <coreboot_tables.h>
  33
  34 /*
  35  * Some of this is x86 specific, and the rest of it is generic. Right now,
  36  * since we only support x86, we'll avoid trying to make lots of infrastructure
  37  * we don't need. If in the future, we want to use coreboot on some other
  38  * architecture, then take out the generic parsing code and move it elsewhere.
  39  */
  40
  41 /* === Parsing code === */
  42 /* This is the generic parsing code. */
  43
  44 static void cb_parse_x86_rom_var_mtrr(void *ptr, struct sysinfo_t *info)
  45 {
  46         struct cb_x86_rom_mtrr *rom_mtrr = ptr;
  47         info->x86_rom_var_mtrr_index = rom_mtrr->index;
  48 }
  49
  50 int cb_parse_arch_specific(struct cb_record *rec, struct sysinfo_t *info)
  51 {
  52         switch(rec->tag) {
  53         case CB_TAG_X86_ROM_MTRR:
  54                 cb_parse_x86_rom_var_mtrr(rec, info);
  55                 break;
  56         default:
  57                 return 0;
  58         }
  59         return 1;
  60 }
  61
  62 /* This pointer gets set in head.S and is passed in from coreboot. */
  63 void *cb_header_ptr;
  64
  65 int get_coreboot_info(struct sysinfo_t *info)
  66 {
  67         int ret;
  68
  69         /* Ensure the variable range MTRR index covering the ROM is set to
  70          * an invalid value. */
  71         info->x86_rom_var_mtrr_index = -1;
  72
  73         ret = cb_parse_header(cb_header_ptr, 1, info);
  74
  75         if (ret)
  76                 ret = cb_parse_header(phys_to_virt(0x00000000), 0x1000, info);
  77
  78         if (ret)
  79                 ret = cb_parse_header(phys_to_virt(0x000f0000), 0x1000, info);
  80
  81         return ret;
  82 }