src/soc/amd/stoneyridge/finalize.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2018 Advanced Micro Devices, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <cpu/x86/mp.h>
  17 #include <cpu/x86/msr.h>
  18 #include <cpu/amd/msr.h>
  19 #include <bootstate.h>
  20 #include <timer.h>
  21 #include <console/console.h>
  22
  23 static void per_core_finalize(void *unused)
  24 {
  25         msr_t hwcr, mask;
  26
  27         /* Finalize SMM settings */
  28         hwcr = rdmsr(HWCR_MSR);
  29         if (hwcr.lo & SMM_LOCK) /* Skip if already locked, avoid GPF */
  30                 return;
  31
  32         if (IS_ENABLED(CONFIG_SMM_TSEG)) {
  33                 mask = rdmsr(SMM_MASK_MSR);
  34                 mask.lo |= SMM_TSEG_VALID;
  35                 wrmsr(SMM_MASK_MSR, mask);
  36         }
  37
  38         hwcr.lo |= SMM_LOCK;
  39         wrmsr(HWCR_MSR, hwcr);
  40 }
  41
  42 static void finalize_cores(void)
  43 {
  44         int r;
  45         printk(BIOS_SPEW, "Lock SMM configuration\n");
  46
  47         r = mp_run_on_all_cpus(per_core_finalize, NULL, 10 * USECS_PER_MSEC);
  48         if (r)
  49                 printk(BIOS_WARNING, "Failed to finalize all cores\n");
  50 }
  51
  52 static void soc_finalize(void *unused)
  53 {
  54         finalize_cores();
  55
  56         post_code(POST_OS_BOOT);
  57 }
  58
  59 BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, soc_finalize, NULL);
  60 BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, soc_finalize, NULL);