10597 would like a way to set NMI behavior at boot
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Andy Fiddaman <andy@omniosce.org>

*** 21,31 ****
  /*
   * Copyright (c) 2012 Gary Mills
   *
   * Copyright (c) 1993, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2011 by Delphix. All rights reserved.
!  * Copyright 2018 Joyent, Inc.
   */
  /*
   * Copyright (c) 2010, Intel Corporation.
   * All rights reserved.
   */
--- 21,31 ----
  /*
   * Copyright (c) 2012 Gary Mills
   *
   * Copyright (c) 1993, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2011 by Delphix. All rights reserved.
!  * Copyright 2019, Joyent, Inc.
   */
  /*
   * Copyright (c) 2010, Intel Corporation.
   * All rights reserved.
   */
*** 59,68 ****
--- 59,70 ----
  #include <sys/boot_console.h>
  #include <sys/kdi_machimpl.h>
  #include <sys/archsystm.h>
  #include <sys/promif.h>
  #include <sys/pci_cfgspace.h>
+ #include <sys/apic.h>
+ #include <sys/apic_common.h>
  #include <sys/bootvfs.h>
  #include <sys/tsc.h>
  #ifdef __xpv
  #include <sys/hypervisor.h>
  #else
*** 77,86 ****
--- 79,90 ----
  extern uint32_t cpuid_feature_ecx_include;
  extern uint32_t cpuid_feature_ecx_exclude;
  extern uint32_t cpuid_feature_edx_include;
  extern uint32_t cpuid_feature_edx_exclude;
  
+ nmi_action_t nmi_action = NMI_ACTION_UNSET;
+ 
  /*
   * Set console mode
   */
  static void
  set_console_mode(uint8_t val)
*** 101,110 ****
--- 105,115 ----
   */
  void
  mlsetup(struct regs *rp)
  {
          u_longlong_t prop_value;
+         char prop_str[BP_MAX_STRLEN];
          extern struct classfuncs sys_classfuncs;
          extern disp_t cpu0_disp;
          extern char t0stack[];
          extern int post_fastreboot;
          extern uint64_t plat_dr_options;
*** 147,156 ****
--- 152,174 ----
                  cpuid_feature_edx_exclude = 0;
          else
                  cpuid_feature_edx_exclude = (uint32_t)prop_value;
  
  #if !defined(__xpv)
+         if (bootprop_getstr("nmi", prop_str, sizeof (prop_str)) == 0) {
+                 if (strcmp(prop_str, "ignore") == 0) {
+                         nmi_action = NMI_ACTION_IGNORE;
+                 } else if (strcmp(prop_str, "panic") == 0) {
+                         nmi_action = NMI_ACTION_PANIC;
+                 } else if (strcmp(prop_str, "kmdb") == 0) {
+                         nmi_action = NMI_ACTION_KMDB;
+                 } else {
+                         prom_printf("unix: ignoring unknown nmi=%s\n",
+                             prop_str);
+                 }
+         }
+ 
          /*
           * Check to see if KPTI has been explicitly enabled or disabled.
           * We have to check this before init_desctbls().
           */
          if (bootprop_getval("kpti", &prop_value) == 0) {