Add crossystem support for nvram_cleared and kern_nv

host/lib/crossystem.c

 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <stdio.h>
 #include <string.h>
 
 #include "host_common.h"
 
@@ skipping 471 matching lines @@
   else if (!strcasecmp(name,"savedmem_base")) {
     return (-1 == ReadFileInt(ACPI_CHSW_PATH) ? -1 : 0x00F00000);
   } else if (!strcasecmp(name,"savedmem_size")) {
     return (-1 == ReadFileInt(ACPI_CHSW_PATH) ? -1 : 0x00100000);
   }
   /* NV storage values with no defaults for older BIOS. */
   else if (!strcasecmp(name,"tried_fwb")) {
     value = VbGetNvStorage(VBNV_TRIED_FIRMWARE_B);
   } else if (!strcasecmp(name,"kern_nv")) {
     value = VbGetNvStorage(VBNV_KERNEL_FIELD);
+  } else if (!strcasecmp(name,"nvram_cleared")) {
+    value = VbGetNvStorage(VBNV_KERNEL_SETTINGS_RESET);
   }
   /* NV storage values.  If unable to get from NV storage, fall back to the
    * CMOS reboot field used by older BIOS. */
   else if (!strcasecmp(name,"recovery_request")) {
     value = VbGetNvStorage(VBNV_RECOVERY_REQUEST);
     if (-1 == value)
       value = VbGetCmosRebootField(CMOSRF_RECOVERY);
   } else if (!strcasecmp(name,"dbg_reset")) {
     value = VbGetNvStorage(VBNV_DEBUG_RESET_MODE);
     if (-1 == value)
       value = VbGetCmosRebootField(CMOSRF_DEBUG_RESET);
   } else if (!strcasecmp(name,"fwb_tries")) {
     value = VbGetNvStorage(VBNV_TRY_B_COUNT);
     if (-1 == value)
       value = VbGetCmosRebootField(CMOSRF_TRY_B);
   }
   /* Other parameters */
   else if (!strcasecmp(name,"recovery_reason")) {
     return VbGetRecoveryReason();
   } else if (!strcasecmp(name,"fmap_base")) {
     value = ReadFileInt(ACPI_FMAP_PATH);
   }
 
-  /* TODO: implement the following properties:
-   *   nvram_cleared
-   */
-
   return value;
 }
 
 
 /* Read a system property string into a destination buffer of the specified
  * size.
  *
  * Returns the passed buffer, or NULL if error. */
 const char* VbGetSystemPropertyString(const char* name, char* dest, int size) {
 
@@ skipping 38 matching lines @@
     return NULL;
 }
 
 
 /* Set a system property integer.
  *
  * Returns 0 if success, -1 if error. */
 int VbSetSystemPropertyInt(const char* name, int value) {
 
   /* NV storage values with no defaults for older BIOS. */
-  if (!strcasecmp(name,"kern_nv")) {
+  if (!strcasecmp(name,"nvram_cleared")) {
+    /* Can only clear this flag; it's set inside the NV storage library. */
+    return VbSetNvStorage(VBNV_KERNEL_SETTINGS_RESET, 0);
+  } else if (!strcasecmp(name,"kern_nv")) {
     return VbSetNvStorage(VBNV_KERNEL_FIELD, value);
   }
   /* NV storage values.  If unable to get from NV storage, fall back to the
    * CMOS reboot field used by older BIOS. */
   else if (!strcasecmp(name,"recovery_request")) {
     if (0 == VbSetNvStorage(VBNV_RECOVERY_REQUEST, value))
       return 0;
     return VbSetCmosRebootField(CMOSRF_RECOVERY, value);
   } else if (!strcasecmp(name,"dbg_reset")) {
     if (0 == VbSetNvStorage(VBNV_DEBUG_RESET_MODE, value))
       return 0;
     return  VbSetCmosRebootField(CMOSRF_DEBUG_RESET, value);
   } else if (!strcasecmp(name,"fwb_tries")) {
     if (0 == VbSetNvStorage(VBNV_TRY_B_COUNT, value))
       return 0;
     return VbSetCmosRebootField(CMOSRF_TRY_B, value);
   }
 
-  /* TODO: implement the following:
-   *   nvram_cleared
-   */
-
   return -1;
 }
 
 
 /* Set a system property string.
  *
  * Returns 0 if success, -1 if error. */
 int VbSetSystemPropertyString(const char* name, const char* value) {
 
   /* TODO: support setting */
   return -1;
 }