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/********************************************************************************/
/* */
/* I/O Buffers */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: IoBuffers.c 1311 2018-08-23 21:39:29Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
/* information on specification licensing rights available through TCG */
/* membership agreements. */
/* */
/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */
/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */
/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */
/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */
/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */
/* */
/* - Without limitation, TCG and its members and licensors disclaim all */
/* liability, including liability for infringement of any proprietary */
/* rights, relating to use of information in this specification and to the */
/* implementation of this specification, and TCG disclaims all liability for */
/* cost of procurement of substitute goods or services, lost profits, loss */
/* of use, loss of data or any incidental, consequential, direct, indirect, */
/* or special damages, whether under contract, tort, warranty or otherwise, */
/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 - 2018 */
/* */
/********************************************************************************/
/* 9.7 IoBuffers.c */
/* 9.7.1 Includes and Data Definitions */
/* This definition allows this module to see the values that are private to this module but kept in
Global.c for ease of state migration. */
#define IO_BUFFER_C
#include "Tpm.h"
#include "IoBuffers_fp.h"
/* 9.7.2 Buffers and Functions */
/* These buffers are set aside to hold command and response values. In this implementation, it is
not guaranteed that the code will stop accessing the s_actionInputBuffer before starting to put
values in the s_actionOutputBuffer so different buffers are required. */
/* 9.7.2.1 MemoryIoBufferAllocationReset() */
/* This function is used to reset the allocation of buffers. */
void
MemoryIoBufferAllocationReset(
void
)
{
s_actionIoAllocation = 0;
}
/* 9.7.2.2 MemoryIoBufferZero() */
/* Function zeros the action I/O buffer at the end of a command. Calling this is not mandatory for
proper functionality. */
void
MemoryIoBufferZero(
void
)
{
memset(s_actionIoBuffer, 0, s_actionIoAllocation);
}
/* 9.7.2.3 MemoryGetInBuffer() */
/* This function returns the address of the buffer into which the command parameters will be
unmarshaled in preparation for calling the command actions. */
BYTE *
MemoryGetInBuffer(
UINT32 size // Size, in bytes, required for the input
// unmarshaling
)
{
pAssert(size <= sizeof(s_actionIoBuffer));
// In this implementation, a static buffer is set aside for the command action
// buffers. The buffer is shared between input and output. This is because
// there is no need to allocate for the worst case input and worst case output
// at the same time.
// Round size up
#define UoM (sizeof(s_actionIoBuffer[0]))
size = (size + (UoM - 1)) & (UINT32_MAX - (UoM - 1));
memset(s_actionIoBuffer, 0, size);
s_actionIoAllocation = size;
return (BYTE *)&s_actionIoBuffer[0];
}
/* 9.7.2.4 MemoryGetOutBuffer() */
/* This function returns the address of the buffer into which the command action code places its
output values. */
BYTE *
MemoryGetOutBuffer(
UINT32 size // required size of the buffer
)
{
BYTE *retVal = (BYTE *)(&s_actionIoBuffer[s_actionIoAllocation / UoM]);
pAssert((size + s_actionIoAllocation) < (sizeof(s_actionIoBuffer)));
// In this implementation, a static buffer is set aside for the command action
// output buffer.
memset(retVal, 0, size);
s_actionIoAllocation += size;
return retVal;
}
/* 9.7.2.5 IsLabelProperlyFormatted() */
/* This function checks that a label is a null-terminated string. */
/* NOTE: this function is here because there was no better place for it. */
/* Return Value Meaning */
/* FALSE string is not null terminated */
/* TRUE string is null terminated */
BOOL
IsLabelProperlyFormatted(
TPM2B *x
)
{
return (((x)->size == 0) || ((x)->buffer[(x)->size - 1] == 0));
}
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