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Diffstat (limited to 'board/cr50/tpm2/NVMem.c')
| -rw-r--r-- | board/cr50/tpm2/NVMem.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/board/cr50/tpm2/NVMem.c b/board/cr50/tpm2/NVMem.c deleted file mode 100644 index e1a14b4536..0000000000 --- a/board/cr50/tpm2/NVMem.c +++ /dev/null @@ -1,190 +0,0 @@ -/* Copyright 2015 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. - * - * The function prototypes were extracted from the TCG Published - * Trusted Platform Module Library - * Part 4: Supporting Routines - * Family "2.0" - * Level 00 Revision 01.16 - * October 30, 2014 - */ - -#include <string.h> - -#include "Platform.h" -#include "PlatformData.h" -#include "TpmError.h" -#include "assert.h" -#include "nvmem.h" - -/* Local state */ -static struct { - BOOL s_NvIsAvailable; - BOOL s_NV_unrecoverable; - BOOL s_NV_recoverable; -} local_state __attribute__((section(".bss.Tpm2_common"))); -/* - * This function is used by the simulator to set the error flags in the NV - * subsystem to simulate an error in the NV loading process. - */ -void _plat__NvErrors(BOOL recoverable, BOOL unrecoverable) -{ - local_state.s_NV_unrecoverable = unrecoverable; - local_state.s_NV_recoverable = recoverable; -} - -/* - * This function should retrieve and verify the integrity of the saved context. - * On success, the NV content has been copied into local RAM for fast access. - * - * The recovery from an integrity failure depends on where the error occurred. - * It it was in the state that is discarded by TPM Reset, then the error is - * recoverable if the TPM is reset. Otherwise, the TPM must go into failure - * mode. - * - * Return Value Meaning - * - * 0 if success - * >0 if receive recoverable error - * <0 if unrecoverable error - */ -int _plat__NVEnable(void *platParameter) -{ - local_state.s_NV_unrecoverable = FALSE; - local_state.s_NV_recoverable = FALSE; - - /* TODO: Need to define what is recoverable and unrecoverable - * conditions with regards to NvMem module. For now, the only - * requirement is that at Cr50 board initialization time, the - * nvmem_init() function either detects a valid partition, or - * determines that NvMem is fully erased and configures a valid - * partition. Setting both variables TRUE if NvMem is not available - */ - local_state.s_NV_recoverable = nvmem_get_error_state() != 0; - local_state.s_NV_unrecoverable = local_state.s_NV_recoverable; - - if (local_state.s_NV_unrecoverable) - return -1; - return local_state.s_NV_recoverable; -} - -void _plat__NVDisable(void) -{ - /* nothing yet */ -} - -/* - * Check if NV is available - * - * Return Value Meaning - * - * 0 NV is available - * 1 NV not available due to write failure - * 2 NV not available due to rate limit - */ -int _plat__IsNvAvailable(void) -{ - - int rv; - - /* - * sNv_IsAvailable is a state variable that can be accesed by the - * simmulator to control access to NvMemory. This variable and - * the on chip NvMem area must be in the correct state for NvMem - * to be in 'NV is available' state. - */ - rv = !local_state.s_NvIsAvailable || nvmem_get_error_state(); - return rv; -} - -/* - * Read a chunk of NV memory - */ -void _plat__NvMemoryRead(unsigned int startOffset, - unsigned int size, - void *data) -{ - if (_plat__NvOffsetIsVirtual(startOffset)) { - _plat__NvVirtualMemoryRead(startOffset, size, data); - return; - } - - assert(startOffset + size <= NV_MEMORY_SIZE); - /* Copy the data from the NV image */ - nvmem_read(startOffset, size, data, NVMEM_TPM); - return; -} - -/* - * This function tests to see if the NV is different from the test value. - * Returns true if different, false if not. - */ -BOOL -_plat__NvIsDifferent(unsigned int startOffset, - unsigned int size, - void *data) -{ - return (nvmem_is_different(startOffset, size, data, NVMEM_TPM) != 0); -} - -/* - * This function is used to update NV memory. The write is to a memory copy of - * NV. At the end of the current command, any changes are written to the actual - * NV memory. - */ -void _plat__NvMemoryWrite(unsigned int startOffset, - unsigned int size, - void *data) -{ - assert(startOffset + size <= NV_MEMORY_SIZE); - /* Copy the data to the NV image */ - nvmem_write(startOffset, size, data, NVMEM_TPM); -} - -/* - * Function: Move a chunk of NV memory from source to destination, - * handling overlap correctly. - */ -void _plat__NvMemoryMove(unsigned int sourceOffset, - unsigned int destOffset, - unsigned int size) -{ - assert(sourceOffset + size <= NV_MEMORY_SIZE); - assert(destOffset + size <= NV_MEMORY_SIZE); - nvmem_move(sourceOffset, destOffset, size, NVMEM_TPM); - return; -} - -/* - * Commit the local RAM copy to NV storage. - * - * Return Value Meaning - * - * 0 NV write success - * non-0 NV write fail - */ -int _plat__NvCommit(void) -{ - return nvmem_commit(); -} - -/* - * Set the current NV state to available. This function is for testing purpose - * only. It is not part of the platform NV logic - */ -void _plat__SetNvAvail(void) -{ - local_state.s_NvIsAvailable = TRUE; - return; -} - -/* - * Set the current NV state to unavailable. This function is for testing - * purpose only. It is not part of the platform NV logic - */ -void _plat__ClearNvAvail(void) -{ - local_state.s_NvIsAvailable = FALSE; - return; -} |