utility/tlcl_generator.c - mirrors/cros/chromiumos/platform/vboot_reference - Git at Google

 /* Copyright (c) 2010 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.
  */

 /* This program generates partially filled TPM datagrams and other compile-time
  * constants (e.g. structure sizes and offsets).  Compile this file---and ONLY
  * this file---with -fpack-struct.  We take advantage of the fact that the
  * (packed) TPM structures layout (mostly) match the TPM request and response
  * datagram layout.  When they don't completely match, some fixing is necessary
  * (see PCR_SELECTION_FIX below).
  */

 #include <assert.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <tss/tcs.h>

 #include "sysincludes.h"
 #include "tlcl_internal.h"
 #include "tpmextras.h"

 /* See struct Command below.  This structure represent a field in a TPM
  * command.  [name] is the field name.  [visible] is 1 if the field is
  * modified by the run-time.  Non-visible fields are initialized at build time
  * and remain constant.  [size] is the field size in bytes.  [value] is the
  * fixed value of non-visible fields.
  */
 typedef struct Field {
   const char* name;
   int visible;
   int offset;
   int size;
   uint32_t value;     /* large enough for all initializers */
   struct Field* next;
 } Field;

 /* This structure is used to build (at build time) and manipulate (at firmware
  * or emulation run time) buffers containing TPM datagrams.  [name] is the name
  * of a TPM command.  [size] is the size of the command buffer in bytes, when
  * known.  [max_size] is the maximum size allowed for variable-length commands
  * (such as Read and Write).  [fields] is a link-list of command fields.
  */
 typedef struct Command {
   const char* name;
   int size;
   int max_size;
   Field* fields;
   struct Command* next;
 } Command;

 /* Adds a field to a command, and makes its offset visible.  The fields must be
  * added at increasing offsets.
  */
 static void AddVisibleField(Command* cmd, const char* name, int offset) {
   Field* fld = (Field*) malloc(sizeof(Field));
   if (cmd->fields != NULL) {
     assert(offset > fn->offset);
   }
   fld->next = cmd->fields;
   cmd->fields = fld;
   fld->name = name;
   fld->visible = 1;
   fld->offset = offset;
 }

 /* Adds a constant field with its value.  The fields must be added at
  * increasing offsets.
  */
 static void AddInitializedField(Command* cmd, int offset,
                                 int size, uint32_t value) {
   Field* fld = (Field*) malloc(sizeof(Field));
   fld->next = cmd->fields;
   cmd->fields = fld;
   fld->name = NULL;
   fld->visible = 0;
   fld->size = size;
   fld->offset = offset;
   fld->value = value;
 }

 /* Create a structure representing a TPM command datagram.
  */
 Command* newCommand(TPM_COMMAND_CODE code, int size) {
   Command* cmd = (Command*) malloc(sizeof(Command));
   cmd->size = size;
   AddInitializedField(cmd, 0, sizeof(TPM_TAG), TPM_TAG_RQU_COMMAND);
   AddInitializedField(cmd, sizeof(TPM_TAG), sizeof(uint32_t), size);
   AddInitializedField(cmd, sizeof(TPM_TAG) + sizeof(uint32_t),
                       sizeof(TPM_COMMAND_CODE), code);
   return cmd;
 }

 /* The TPM_PCR_SELECTION structure in /usr/include/tss/tpm.h contains a pointer
  * instead of an array[3] of bytes, so we need to adjust sizes and offsets
  * accordingly.
  */
 #define PCR_SELECTION_FIX (3 - sizeof(char *))

 /* BuildXXX builds TPM command XXX.
  */
 Command* BuildDefineSpaceCommand(void) {
   int nv_data_public = kTpmRequestHeaderLength;
   int nv_index = nv_data_public + offsetof(TPM_NV_DATA_PUBLIC, nvIndex);
   int nv_pcr_info_read = nv_data_public +
     offsetof(TPM_NV_DATA_PUBLIC, pcrInfoRead);
   /*
    * Here we need to carefully add PCR_SELECTION_FIX (or twice that much) in
    * all the places where the offset calculation would be wrong without it.
    * The mismatch occurs in the TPM_PCR_SELECTION structure, and it must be
    * accounted for in all the structures that include it, directly or
    * indirectly.
    */
   int read_locality = nv_pcr_info_read +
     offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
   int nv_pcr_info_write = nv_data_public +
     offsetof(TPM_NV_DATA_PUBLIC, pcrInfoWrite) + PCR_SELECTION_FIX;
   int write_locality = nv_pcr_info_write +
     offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
   int nv_permission = nv_data_public +
     offsetof(TPM_NV_DATA_PUBLIC, permission) + 2 * PCR_SELECTION_FIX;
   int nv_permission_tag =
     nv_permission + offsetof(TPM_NV_ATTRIBUTES, tag);
   int nv_permission_attributes =
     nv_permission + offsetof(TPM_NV_ATTRIBUTES, attributes);
   int nv_datasize = nv_data_public +
     offsetof(TPM_NV_DATA_PUBLIC, dataSize) + 2 * PCR_SELECTION_FIX;

   int size = kTpmRequestHeaderLength + sizeof(TPM_NV_DATA_PUBLIC) +
     2 * PCR_SELECTION_FIX + kEncAuthLength;
   Command* cmd = newCommand(TPM_ORD_NV_DefineSpace, size);
   cmd->name = "tpm_nv_definespace_cmd";

   AddVisibleField(cmd, "index", nv_index);
   AddVisibleField(cmd, "perm", nv_permission_attributes);
   AddVisibleField(cmd, "size", nv_datasize);

   AddInitializedField(cmd, nv_data_public, sizeof(uint16_t),
                       TPM_TAG_NV_DATA_PUBLIC);
   AddInitializedField(cmd, nv_pcr_info_read, sizeof(uint16_t), 3);
   AddInitializedField(cmd, read_locality, sizeof(TPM_LOCALITY_SELECTION),
                       TPM_ALL_LOCALITIES);
   AddInitializedField(cmd, nv_pcr_info_write, sizeof(uint16_t), 3);
   AddInitializedField(cmd, write_locality, sizeof(TPM_LOCALITY_SELECTION),
                       TPM_ALL_LOCALITIES);
   AddInitializedField(cmd, nv_permission_tag, sizeof(TPM_STRUCTURE_TAG),
                       TPM_TAG_NV_ATTRIBUTES);
   return cmd;
 }

 /* BuildXXX builds TPM command XXX.
  */
 Command* BuildWriteCommand(void) {
   Command* cmd = newCommand(TPM_ORD_NV_WriteValue, 0);
   cmd->name = "tpm_nv_write_cmd";
   cmd->max_size = TPM_LARGE_ENOUGH_COMMAND_SIZE;
   AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
   AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
   AddVisibleField(cmd, "data", kTpmRequestHeaderLength + 12);
   return cmd;
 }

 Command* BuildReadCommand(void) {
   int size = kTpmRequestHeaderLength + kTpmReadInfoLength;
   Command* cmd = newCommand(TPM_ORD_NV_ReadValue, size);
   cmd->name = "tpm_nv_read_cmd";
   AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
   AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
   return cmd;
 }

 Command* BuildPPAssertCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
   Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
   cmd->name = "tpm_ppassert_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_PHYSICAL_PRESENCE),
                       TPM_PHYSICAL_PRESENCE_PRESENT);
   return cmd;
 }

 Command* BuildPPEnableCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
   Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
   cmd->name = "tpm_ppenable_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_PHYSICAL_PRESENCE),
                       TPM_PHYSICAL_PRESENCE_CMD_ENABLE);
   return cmd;
 }

 Command* BuildFinalizePPCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
   Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
   cmd->name = "tpm_finalizepp_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_PHYSICAL_PRESENCE),
                       TPM_PHYSICAL_PRESENCE_CMD_ENABLE |
                       TPM_PHYSICAL_PRESENCE_HW_DISABLE |
                       TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK);
   return cmd;
 }

 Command* BuildPPLockCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
   Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
   cmd->name = "tpm_pplock_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_PHYSICAL_PRESENCE),
                       TPM_PHYSICAL_PRESENCE_LOCK);
   return cmd;
 }

 Command* BuildStartupCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
   Command* cmd = newCommand(TPM_ORD_Startup, size);
   cmd->name = "tpm_startup_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_STARTUP_TYPE),
                       TPM_ST_CLEAR);
   return cmd;
 }

 Command* BuildSaveStateCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_SaveState, size);
   cmd->name = "tpm_savestate_cmd";
   return cmd;
 }

 Command* BuildResumeCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
   Command* cmd = newCommand(TPM_ORD_Startup, size);
   cmd->name = "tpm_resume_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_STARTUP_TYPE),
                       TPM_ST_STATE);
   return cmd;
 }

 Command* BuildSelftestfullCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_SelfTestFull, size);
   cmd->name = "tpm_selftestfull_cmd";
   return cmd;
 }

 Command* BuildContinueSelfTestCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_ContinueSelfTest, size);
   cmd->name = "tpm_continueselftest_cmd";
   return cmd;
 }

 Command* BuildReadPubekCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(TPM_NONCE);
   Command* cmd = newCommand(TPM_ORD_ReadPubek, size);
   cmd->name = "tpm_readpubek_cmd";
   return cmd;
 }

 Command* BuildForceClearCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_ForceClear, size);
   cmd->name = "tpm_forceclear_cmd";
   return cmd;
 }

 Command* BuildPhysicalEnableCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_PhysicalEnable, size);
   cmd->name = "tpm_physicalenable_cmd";
   return cmd;
 }

 Command* BuildPhysicalDisableCommand(void) {
   int size = kTpmRequestHeaderLength;
   Command* cmd = newCommand(TPM_ORD_PhysicalDisable, size);
   cmd->name = "tpm_physicaldisable_cmd";
   return cmd;
 }

 Command* BuildPhysicalSetDeactivatedCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(uint8_t);
   Command* cmd = newCommand(TPM_ORD_PhysicalSetDeactivated, size);
   cmd->name = "tpm_physicalsetdeactivated_cmd";
   AddVisibleField(cmd, "deactivated", kTpmRequestHeaderLength);
   return cmd;
 }

 Command* BuildExtendCommand(void) {
   int size = kTpmRequestHeaderLength + sizeof(uint32_t) + kPcrDigestLength;
   Command* cmd = newCommand(TPM_ORD_Extend, size);
   cmd->name = "tpm_extend_cmd";
   AddVisibleField(cmd, "pcrNum", kTpmRequestHeaderLength);
   AddVisibleField(cmd, "inDigest", kTpmRequestHeaderLength + sizeof(uint32_t));
   return cmd;
 }

 Command* BuildGetFlagsCommand(void) {
   int size = (kTpmRequestHeaderLength +
               sizeof(TPM_CAPABILITY_AREA) +   /* capArea */
               sizeof(uint32_t) +              /* subCapSize */
               sizeof(uint32_t));              /* subCap */

   Command* cmd = newCommand(TPM_ORD_GetCapability, size);
   cmd->name = "tpm_getflags_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
   AddInitializedField(cmd, kTpmRequestHeaderLength +
                       sizeof(TPM_CAPABILITY_AREA),
                       sizeof(uint32_t), sizeof(uint32_t));
   AddInitializedField(cmd, kTpmRequestHeaderLength +
                       sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
                       sizeof(uint32_t), TPM_CAP_FLAG_PERMANENT);
   return cmd;
 }

 Command* BuildGetSTClearFlagsCommand(void) {
   int size = (kTpmRequestHeaderLength +
               sizeof(TPM_CAPABILITY_AREA) +   /* capArea */
               sizeof(uint32_t) +              /* subCapSize */
               sizeof(uint32_t));              /* subCap */

   Command* cmd = newCommand(TPM_ORD_GetCapability, size);
   cmd->name = "tpm_getstclearflags_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
   AddInitializedField(cmd, kTpmRequestHeaderLength +
                       sizeof(TPM_CAPABILITY_AREA),
                       sizeof(uint32_t), sizeof(uint32_t));
   AddInitializedField(cmd, kTpmRequestHeaderLength +
                       sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
                       sizeof(uint32_t), TPM_CAP_FLAG_VOLATILE);
   return cmd;
 }

 Command* BuildGetPermissionsCommand(void) {
   int size = (kTpmRequestHeaderLength +
               sizeof(TPM_CAPABILITY_AREA) +   /* capArea */
               sizeof(uint32_t) +              /* subCapSize */
               sizeof(uint32_t));              /* subCap */

   Command* cmd = newCommand(TPM_ORD_GetCapability, size);
   cmd->name = "tpm_getpermissions_cmd";
   AddInitializedField(cmd, kTpmRequestHeaderLength,
                       sizeof(TPM_CAPABILITY_AREA), TPM_CAP_NV_INDEX);
   AddInitializedField(cmd, kTpmRequestHeaderLength +
                       sizeof(TPM_CAPABILITY_AREA),
                       sizeof(uint32_t), sizeof(uint32_t));
   AddVisibleField(cmd, "index", kTpmRequestHeaderLength +
                   sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t));
   return cmd;
 }

 /* Output the fields of a structure.
  */
 void OutputFields(Field* fld) {
   /*
    * Field order is reversed.
    */
   if (fld != NULL) {
     OutputFields(fld->next);
     if (fld->visible) {
       printf("  uint16_t %s;\n", fld->name);
     }
   }
 }

 /* Outputs a structure initializer.
  */
 int OutputBytes_(Command* cmd, Field* fld) {
   int cursor = 0;
   int i;
   /*
    * Field order is reversed.
    */
   if (fld != NULL) {
     cursor = OutputBytes_(cmd, fld->next);
   } else {
     return 0;
   }
   if (!fld->visible) {
     /*
      * Catch up missing fields.
      */
     assert(fld->offset >= cursor);
     for (i = 0; i < fld->offset - cursor; i++) {
       printf("0, ");
     }
     cursor = fld->offset;
     switch (fld->size) {
     case 1:
       printf("0x%x, ", fld->value);
       cursor += 1;
       break;
     case 2:
       printf("0x%x, 0x%x, ", fld->value >> 8, fld->value & 0xff);
       cursor += 2;
       break;
     case 4:
       printf("0x%x, 0x%x, 0x%x, 0x%x, ", fld->value >> 24,
              (fld->value >> 16) & 0xff,
              (fld->value >> 8) & 0xff,
              fld->value & 0xff);
       cursor += 4;
       break;
     default:
       fprintf(stderr, "invalid field size %d\n", fld->size);
       exit(1);
       break;
     }
   }
   return cursor;
 }

 /* Helper to output a structure initializer.
  */
 void OutputBytes(Command* cmd) {
   (void) OutputBytes_(cmd, cmd->fields);
 }

 void OutputFieldPointers(Command* cmd, Field* fld) {
   if (fld == NULL) {
     return;
   } else {
     OutputFieldPointers(cmd, fld->next);
     if (fld->visible) {
       printf("%d, ", fld->offset);
     }
   }
 }

 /* Outputs the structure initializers for all commands.
  */
 void OutputCommands(Command* cmd) {
   if (cmd == NULL) {
     return;
   } else {
     printf("const struct s_%s{\n  uint8_t buffer[%d];\n",
            cmd->name, cmd->size == 0 ? cmd->max_size : cmd->size);
     OutputFields(cmd->fields);
     printf("} %s = {{", cmd->name);
     OutputBytes(cmd);
     printf("},\n");
     OutputFieldPointers(cmd, cmd->fields);
     printf("};\n\n");
   }
   OutputCommands(cmd->next);
 }

 Command* (*builders[])(void) = {
   BuildDefineSpaceCommand,
   BuildWriteCommand,
   BuildReadCommand,
   BuildPPAssertCommand,
   BuildPPEnableCommand,
   BuildPPLockCommand,
   BuildFinalizePPCommand,
   BuildStartupCommand,
   BuildSaveStateCommand,
   BuildResumeCommand,
   BuildSelftestfullCommand,
   BuildContinueSelfTestCommand,
   BuildReadPubekCommand,
   BuildForceClearCommand,
   BuildPhysicalDisableCommand,
   BuildPhysicalEnableCommand,
   BuildPhysicalSetDeactivatedCommand,
   BuildGetFlagsCommand,
   BuildGetSTClearFlagsCommand,
   BuildGetPermissionsCommand,
   BuildExtendCommand,
 };

 static void FreeFields(Field* fld) {
   if (fld != NULL) {
     Field* next_field = fld->next;
     free(fld);
     FreeFields(next_field);
   }
 }

 static void FreeCommands(Command* cmd) {
   if (cmd != NULL) {
     Command* next_command = cmd->next;
     free(cmd);
     FreeFields(cmd->fields);
     FreeCommands(next_command);
   }
 }

 int main(void) {
   Command* commands = NULL;
   int i;
   for (i = 0; i < sizeof(builders) / sizeof(builders[0]); i++) {
     Command* cmd = builders[i]();
     cmd->next = commands;
     commands = cmd;
   }

   printf("/* This file is automatically generated */\n\n");
   OutputCommands(commands);
   printf("const int kWriteInfoLength = %d;\n", (int) sizeof(TPM_WRITE_INFO));
   printf("const int kNvDataPublicPermissionsOffset = %d;\n",
          (int) (offsetof(TPM_NV_DATA_PUBLIC, permission) +
                 2 * PCR_SELECTION_FIX +
                 offsetof(TPM_NV_ATTRIBUTES, attributes)));

   FreeCommands(commands);
   return 0;
 }
	/* Copyright (c) 2010 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.
	*/

	/* This program generates partially filled TPM datagrams and other compile-time
	* constants (e.g. structure sizes and offsets). Compile this file---and ONLY
	* this file---with -fpack-struct. We take advantage of the fact that the
	* (packed) TPM structures layout (mostly) match the TPM request and response
	* datagram layout. When they don't completely match, some fixing is necessary
	* (see PCR_SELECTION_FIX below).
	*/

	#include <assert.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <tss/tcs.h>

	#include "sysincludes.h"
	#include "tlcl_internal.h"
	#include "tpmextras.h"

	/* See struct Command below. This structure represent a field in a TPM
	* command. [name] is the field name. [visible] is 1 if the field is
	* modified by the run-time. Non-visible fields are initialized at build time
	* and remain constant. [size] is the field size in bytes. [value] is the
	* fixed value of non-visible fields.
	*/
	typedef struct Field {
	const char* name;
	int visible;
	int offset;
	int size;
	uint32_t value; /* large enough for all initializers */
	struct Field* next;
	} Field;

	/* This structure is used to build (at build time) and manipulate (at firmware
	* or emulation run time) buffers containing TPM datagrams. [name] is the name
	* of a TPM command. [size] is the size of the command buffer in bytes, when
	* known. [max_size] is the maximum size allowed for variable-length commands
	* (such as Read and Write). [fields] is a link-list of command fields.
	*/
	typedef struct Command {
	const char* name;
	int size;
	int max_size;
	Field* fields;
	struct Command* next;
	} Command;

	/* Adds a field to a command, and makes its offset visible. The fields must be
	* added at increasing offsets.
	*/
	static void AddVisibleField(Command* cmd, const char* name, int offset) {
	Field* fld = (Field*) malloc(sizeof(Field));
	if (cmd->fields != NULL) {
	assert(offset > fn->offset);
	}
	fld->next = cmd->fields;
	cmd->fields = fld;
	fld->name = name;
	fld->visible = 1;
	fld->offset = offset;
	}

	/* Adds a constant field with its value. The fields must be added at
	* increasing offsets.
	*/
	static void AddInitializedField(Command* cmd, int offset,
	int size, uint32_t value) {
	Field* fld = (Field*) malloc(sizeof(Field));
	fld->next = cmd->fields;
	cmd->fields = fld;
	fld->name = NULL;
	fld->visible = 0;
	fld->size = size;
	fld->offset = offset;
	fld->value = value;
	}

	/* Create a structure representing a TPM command datagram.
	*/
	Command* newCommand(TPM_COMMAND_CODE code, int size) {
	Command* cmd = (Command*) malloc(sizeof(Command));
	cmd->size = size;
	AddInitializedField(cmd, 0, sizeof(TPM_TAG), TPM_TAG_RQU_COMMAND);
	AddInitializedField(cmd, sizeof(TPM_TAG), sizeof(uint32_t), size);
	AddInitializedField(cmd, sizeof(TPM_TAG) + sizeof(uint32_t),
	sizeof(TPM_COMMAND_CODE), code);
	return cmd;
	}

	/* The TPM_PCR_SELECTION structure in /usr/include/tss/tpm.h contains a pointer
	* instead of an array[3] of bytes, so we need to adjust sizes and offsets
	* accordingly.
	*/
	#define PCR_SELECTION_FIX (3 - sizeof(char *))

	/* BuildXXX builds TPM command XXX.
	*/
	Command* BuildDefineSpaceCommand(void) {
	int nv_data_public = kTpmRequestHeaderLength;
	int nv_index = nv_data_public + offsetof(TPM_NV_DATA_PUBLIC, nvIndex);
	int nv_pcr_info_read = nv_data_public +
	offsetof(TPM_NV_DATA_PUBLIC, pcrInfoRead);
	/*
	* Here we need to carefully add PCR_SELECTION_FIX (or twice that much) in
	* all the places where the offset calculation would be wrong without it.
	* The mismatch occurs in the TPM_PCR_SELECTION structure, and it must be
	* accounted for in all the structures that include it, directly or
	* indirectly.
	*/
	int read_locality = nv_pcr_info_read +
	offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
	int nv_pcr_info_write = nv_data_public +
	offsetof(TPM_NV_DATA_PUBLIC, pcrInfoWrite) + PCR_SELECTION_FIX;
	int write_locality = nv_pcr_info_write +
	offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
	int nv_permission = nv_data_public +
	offsetof(TPM_NV_DATA_PUBLIC, permission) + 2 * PCR_SELECTION_FIX;
	int nv_permission_tag =
	nv_permission + offsetof(TPM_NV_ATTRIBUTES, tag);
	int nv_permission_attributes =
	nv_permission + offsetof(TPM_NV_ATTRIBUTES, attributes);
	int nv_datasize = nv_data_public +
	offsetof(TPM_NV_DATA_PUBLIC, dataSize) + 2 * PCR_SELECTION_FIX;

	int size = kTpmRequestHeaderLength + sizeof(TPM_NV_DATA_PUBLIC) +
	2 * PCR_SELECTION_FIX + kEncAuthLength;
	Command* cmd = newCommand(TPM_ORD_NV_DefineSpace, size);
	cmd->name = "tpm_nv_definespace_cmd";

	AddVisibleField(cmd, "index", nv_index);
	AddVisibleField(cmd, "perm", nv_permission_attributes);
	AddVisibleField(cmd, "size", nv_datasize);

	AddInitializedField(cmd, nv_data_public, sizeof(uint16_t),
	TPM_TAG_NV_DATA_PUBLIC);
	AddInitializedField(cmd, nv_pcr_info_read, sizeof(uint16_t), 3);
	AddInitializedField(cmd, read_locality, sizeof(TPM_LOCALITY_SELECTION),
	TPM_ALL_LOCALITIES);
	AddInitializedField(cmd, nv_pcr_info_write, sizeof(uint16_t), 3);
	AddInitializedField(cmd, write_locality, sizeof(TPM_LOCALITY_SELECTION),
	TPM_ALL_LOCALITIES);
	AddInitializedField(cmd, nv_permission_tag, sizeof(TPM_STRUCTURE_TAG),
	TPM_TAG_NV_ATTRIBUTES);
	return cmd;
	}

	/* BuildXXX builds TPM command XXX.
	*/
	Command* BuildWriteCommand(void) {
	Command* cmd = newCommand(TPM_ORD_NV_WriteValue, 0);
	cmd->name = "tpm_nv_write_cmd";
	cmd->max_size = TPM_LARGE_ENOUGH_COMMAND_SIZE;
	AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
	AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
	AddVisibleField(cmd, "data", kTpmRequestHeaderLength + 12);
	return cmd;
	}

	Command* BuildReadCommand(void) {
	int size = kTpmRequestHeaderLength + kTpmReadInfoLength;
	Command* cmd = newCommand(TPM_ORD_NV_ReadValue, size);
	cmd->name = "tpm_nv_read_cmd";
	AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
	AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
	return cmd;
	}

	Command* BuildPPAssertCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
	Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
	cmd->name = "tpm_ppassert_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_PHYSICAL_PRESENCE),
	TPM_PHYSICAL_PRESENCE_PRESENT);
	return cmd;
	}

	Command* BuildPPEnableCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
	Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
	cmd->name = "tpm_ppenable_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_PHYSICAL_PRESENCE),
	TPM_PHYSICAL_PRESENCE_CMD_ENABLE);
	return cmd;
	}

	Command* BuildFinalizePPCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
	Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
	cmd->name = "tpm_finalizepp_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_PHYSICAL_PRESENCE),
	TPM_PHYSICAL_PRESENCE_CMD_ENABLE \|
	TPM_PHYSICAL_PRESENCE_HW_DISABLE \|
	TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK);
	return cmd;
	}

	Command* BuildPPLockCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
	Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
	cmd->name = "tpm_pplock_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_PHYSICAL_PRESENCE),
	TPM_PHYSICAL_PRESENCE_LOCK);
	return cmd;
	}

	Command* BuildStartupCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
	Command* cmd = newCommand(TPM_ORD_Startup, size);
	cmd->name = "tpm_startup_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_STARTUP_TYPE),
	TPM_ST_CLEAR);
	return cmd;
	}

	Command* BuildSaveStateCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_SaveState, size);
	cmd->name = "tpm_savestate_cmd";
	return cmd;
	}

	Command* BuildResumeCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
	Command* cmd = newCommand(TPM_ORD_Startup, size);
	cmd->name = "tpm_resume_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_STARTUP_TYPE),
	TPM_ST_STATE);
	return cmd;
	}

	Command* BuildSelftestfullCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_SelfTestFull, size);
	cmd->name = "tpm_selftestfull_cmd";
	return cmd;
	}

	Command* BuildContinueSelfTestCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_ContinueSelfTest, size);
	cmd->name = "tpm_continueselftest_cmd";
	return cmd;
	}

	Command* BuildReadPubekCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(TPM_NONCE);
	Command* cmd = newCommand(TPM_ORD_ReadPubek, size);
	cmd->name = "tpm_readpubek_cmd";
	return cmd;
	}

	Command* BuildForceClearCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_ForceClear, size);
	cmd->name = "tpm_forceclear_cmd";
	return cmd;
	}

	Command* BuildPhysicalEnableCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_PhysicalEnable, size);
	cmd->name = "tpm_physicalenable_cmd";
	return cmd;
	}

	Command* BuildPhysicalDisableCommand(void) {
	int size = kTpmRequestHeaderLength;
	Command* cmd = newCommand(TPM_ORD_PhysicalDisable, size);
	cmd->name = "tpm_physicaldisable_cmd";
	return cmd;
	}

	Command* BuildPhysicalSetDeactivatedCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(uint8_t);
	Command* cmd = newCommand(TPM_ORD_PhysicalSetDeactivated, size);
	cmd->name = "tpm_physicalsetdeactivated_cmd";
	AddVisibleField(cmd, "deactivated", kTpmRequestHeaderLength);
	return cmd;
	}

	Command* BuildExtendCommand(void) {
	int size = kTpmRequestHeaderLength + sizeof(uint32_t) + kPcrDigestLength;
	Command* cmd = newCommand(TPM_ORD_Extend, size);
	cmd->name = "tpm_extend_cmd";
	AddVisibleField(cmd, "pcrNum", kTpmRequestHeaderLength);
	AddVisibleField(cmd, "inDigest", kTpmRequestHeaderLength + sizeof(uint32_t));
	return cmd;
	}

	Command* BuildGetFlagsCommand(void) {
	int size = (kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + /* capArea */
	sizeof(uint32_t) + /* subCapSize */
	sizeof(uint32_t)); /* subCap */

	Command* cmd = newCommand(TPM_ORD_GetCapability, size);
	cmd->name = "tpm_getflags_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
	AddInitializedField(cmd, kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA),
	sizeof(uint32_t), sizeof(uint32_t));
	AddInitializedField(cmd, kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
	sizeof(uint32_t), TPM_CAP_FLAG_PERMANENT);
	return cmd;
	}

	Command* BuildGetSTClearFlagsCommand(void) {
	int size = (kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + /* capArea */
	sizeof(uint32_t) + /* subCapSize */
	sizeof(uint32_t)); /* subCap */

	Command* cmd = newCommand(TPM_ORD_GetCapability, size);
	cmd->name = "tpm_getstclearflags_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
	AddInitializedField(cmd, kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA),
	sizeof(uint32_t), sizeof(uint32_t));
	AddInitializedField(cmd, kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
	sizeof(uint32_t), TPM_CAP_FLAG_VOLATILE);
	return cmd;
	}

	Command* BuildGetPermissionsCommand(void) {
	int size = (kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + /* capArea */
	sizeof(uint32_t) + /* subCapSize */
	sizeof(uint32_t)); /* subCap */

	Command* cmd = newCommand(TPM_ORD_GetCapability, size);
	cmd->name = "tpm_getpermissions_cmd";
	AddInitializedField(cmd, kTpmRequestHeaderLength,
	sizeof(TPM_CAPABILITY_AREA), TPM_CAP_NV_INDEX);
	AddInitializedField(cmd, kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA),
	sizeof(uint32_t), sizeof(uint32_t));
	AddVisibleField(cmd, "index", kTpmRequestHeaderLength +
	sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t));
	return cmd;
	}

	/* Output the fields of a structure.
	*/
	void OutputFields(Field* fld) {
	/*
	* Field order is reversed.
	*/
	if (fld != NULL) {
	OutputFields(fld->next);
	if (fld->visible) {
	printf(" uint16_t %s;\n", fld->name);
	}
	}
	}

	/* Outputs a structure initializer.
	*/
	int OutputBytes_(Command* cmd, Field* fld) {
	int cursor = 0;
	int i;
	/*
	* Field order is reversed.
	*/
	if (fld != NULL) {
	cursor = OutputBytes_(cmd, fld->next);
	} else {
	return 0;
	}
	if (!fld->visible) {
	/*
	* Catch up missing fields.
	*/
	assert(fld->offset >= cursor);
	for (i = 0; i < fld->offset - cursor; i++) {
	printf("0, ");
	}
	cursor = fld->offset;
	switch (fld->size) {
	case 1:
	printf("0x%x, ", fld->value);
	cursor += 1;
	break;
	case 2:
	printf("0x%x, 0x%x, ", fld->value >> 8, fld->value & 0xff);
	cursor += 2;
	break;
	case 4:
	printf("0x%x, 0x%x, 0x%x, 0x%x, ", fld->value >> 24,
	(fld->value >> 16) & 0xff,
	(fld->value >> 8) & 0xff,
	fld->value & 0xff);
	cursor += 4;
	break;
	default:
	fprintf(stderr, "invalid field size %d\n", fld->size);
	exit(1);
	break;
	}
	}
	return cursor;
	}

	/* Helper to output a structure initializer.
	*/
	void OutputBytes(Command* cmd) {
	(void) OutputBytes_(cmd, cmd->fields);
	}

	void OutputFieldPointers(Command* cmd, Field* fld) {
	if (fld == NULL) {
	return;
	} else {
	OutputFieldPointers(cmd, fld->next);
	if (fld->visible) {
	printf("%d, ", fld->offset);
	}
	}
	}

	/* Outputs the structure initializers for all commands.
	*/
	void OutputCommands(Command* cmd) {
	if (cmd == NULL) {
	return;
	} else {
	printf("const struct s_%s{\n uint8_t buffer[%d];\n",
	cmd->name, cmd->size == 0 ? cmd->max_size : cmd->size);
	OutputFields(cmd->fields);
	printf("} %s = {{", cmd->name);
	OutputBytes(cmd);
	printf("},\n");
	OutputFieldPointers(cmd, cmd->fields);
	printf("};\n\n");
	}
	OutputCommands(cmd->next);
	}

	Command* (*builders[])(void) = {
	BuildDefineSpaceCommand,
	BuildWriteCommand,
	BuildReadCommand,
	BuildPPAssertCommand,
	BuildPPEnableCommand,
	BuildPPLockCommand,
	BuildFinalizePPCommand,
	BuildStartupCommand,
	BuildSaveStateCommand,
	BuildResumeCommand,
	BuildSelftestfullCommand,
	BuildContinueSelfTestCommand,
	BuildReadPubekCommand,
	BuildForceClearCommand,
	BuildPhysicalDisableCommand,
	BuildPhysicalEnableCommand,
	BuildPhysicalSetDeactivatedCommand,
	BuildGetFlagsCommand,
	BuildGetSTClearFlagsCommand,
	BuildGetPermissionsCommand,
	BuildExtendCommand,
	};

	static void FreeFields(Field* fld) {
	if (fld != NULL) {
	Field* next_field = fld->next;
	free(fld);
	FreeFields(next_field);
	}
	}

	static void FreeCommands(Command* cmd) {
	if (cmd != NULL) {
	Command* next_command = cmd->next;
	free(cmd);
	FreeFields(cmd->fields);
	FreeCommands(next_command);
	}
	}

	int main(void) {
	Command* commands = NULL;
	int i;
	for (i = 0; i < sizeof(builders) / sizeof(builders[0]); i++) {
	Command* cmd = builders[i]();
	cmd->next = commands;
	commands = cmd;
	}

	printf("/* This file is automatically generated */\n\n");
	OutputCommands(commands);
	printf("const int kWriteInfoLength = %d;\n", (int) sizeof(TPM_WRITE_INFO));
	printf("const int kNvDataPublicPermissionsOffset = %d;\n",
	(int) (offsetof(TPM_NV_DATA_PUBLIC, permission) +
	2 * PCR_SELECTION_FIX +
	offsetof(TPM_NV_ATTRIBUTES, attributes)));

	FreeCommands(commands);
	return 0;
	}