diff options
Diffstat (limited to 'SecurityPkg/Tcg/TcgPei/TisPei.c')
| -rw-r--r-- | SecurityPkg/Tcg/TcgPei/TisPei.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/SecurityPkg/Tcg/TcgPei/TisPei.c b/SecurityPkg/Tcg/TcgPei/TisPei.c new file mode 100644 index 0000000000..97d9628bda --- /dev/null +++ b/SecurityPkg/Tcg/TcgPei/TisPei.c @@ -0,0 +1,160 @@ +/** @file
+ TIS (TPM Interface Specification) functions used by TPM PEI driver.
+
+Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <IndustryStandard/Tpm12.h>
+#include <IndustryStandard/UefiTcgPlatform.h>
+#include <Library/TpmCommLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseLib.h>
+#include <Library/IoLib.h>
+#include <Library/BaseMemoryLib.h>
+
+/**
+ Send a command to TPM for execution and return response data.
+
+ @param[in] PeiServices Describes the list of possible PEI Services.
+ @param[in] TisReg TPM register space base address.
+ @param[in] BufferIn Buffer for command data.
+ @param[in] SizeIn Size of command data.
+ @param[in, out] BufferOut Buffer for response data.
+ @param[in, out] SizeOut Size of response data.
+
+ @retval EFI_SUCCESS Operation completed successfully.
+ @retval EFI_TIMEOUT The register can't run into the expected status in time.
+ @retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
+ @retval EFI_DEVICE_ERROR Unexpected device behavior.
+
+**/
+EFI_STATUS
+TisTpmCommand (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN TIS_PC_REGISTERS_PTR TisReg,
+ IN UINT8 *BufferIn,
+ IN UINT32 SizeIn,
+ IN OUT UINT8 *BufferOut,
+ IN OUT UINT32 *SizeOut
+ )
+{
+ EFI_STATUS Status;
+ UINT16 BurstCount;
+ UINT32 Index;
+ UINT32 TpmOutSize;
+ UINT16 Data16;
+ UINT32 Data32;
+
+ Status = TisPcPrepareCommand (TisReg);
+ if (EFI_ERROR (Status)){
+ DEBUG ((DEBUG_ERROR, "Tpm is not ready for command!\n"));
+ return Status;
+ }
+ //
+ // Send the command data to Tpm
+ //
+ Index = 0;
+ while (Index < SizeIn) {
+ Status = TisPcReadBurstCount (TisReg, &BurstCount);
+ if (EFI_ERROR (Status)) {
+ Status = EFI_TIMEOUT;
+ goto Exit;
+ }
+ for (; BurstCount > 0 && Index < SizeIn; BurstCount--) {
+ MmioWrite8((UINTN)&TisReg->DataFifo, *(BufferIn + Index));
+ Index++;
+ }
+ }
+ //
+ // Check the Tpm status STS_EXPECT change from 1 to 0
+ //
+ Status = TisPcWaitRegisterBits (
+ &TisReg->Status,
+ (UINT8) TIS_PC_VALID,
+ TIS_PC_STS_EXPECT,
+ TIS_TIMEOUT_C
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "The send buffer too small!\n"));
+ Status = EFI_BUFFER_TOO_SMALL;
+ goto Exit;
+ }
+ //
+ // Executed the TPM command and waiting for the response data ready
+ //
+ MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_GO);
+ Status = TisPcWaitRegisterBits (
+ &TisReg->Status,
+ (UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),
+ 0,
+ TIS_TIMEOUT_B
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "Wait for Tpm response data time out!!\n"));
+ Status = EFI_TIMEOUT;
+ goto Exit;
+ }
+ //
+ // Get response data header
+ //
+ Index = 0;
+ BurstCount = 0;
+ while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {
+ Status = TisPcReadBurstCount (TisReg, &BurstCount);
+ if (EFI_ERROR (Status)) {
+ Status = EFI_TIMEOUT;
+ goto Exit;
+ }
+ for (; BurstCount > 0; BurstCount--) {
+ *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
+ Index++;
+ if (Index == sizeof (TPM_RSP_COMMAND_HDR)) break;
+ }
+ }
+ //
+ // Check the reponse data header (tag,parasize and returncode )
+ //
+ CopyMem (&Data16, BufferOut, sizeof (UINT16));
+ if (SwapBytes16 (Data16) != TPM_TAG_RSP_COMMAND ) {
+ Status = EFI_DEVICE_ERROR;
+ goto Exit;
+ }
+
+ CopyMem (&Data32, (BufferOut + 2), sizeof (UINT32));
+ TpmOutSize = SwapBytes32 (Data32);
+ if (*SizeOut < TpmOutSize) {
+ Status = EFI_BUFFER_TOO_SMALL;
+ goto Exit;
+ }
+ *SizeOut = TpmOutSize;
+ //
+ // Continue reading the remaining data
+ //
+ while ( Index < TpmOutSize ) {
+ for (; BurstCount > 0; BurstCount--) {
+ *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
+ Index++;
+ if (Index == TpmOutSize) {
+ Status = EFI_SUCCESS;
+ goto Exit;
+ }
+ }
+ Status = TisPcReadBurstCount (TisReg, &BurstCount);
+ if (EFI_ERROR (Status)) {
+ Status = EFI_TIMEOUT;
+ goto Exit;
+ }
+ }
+Exit:
+ MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);
+ return Status;
+}
+
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