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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/sbefw/sbeSecureMemRegionManager.C $ */
/* */
/* OpenPOWER sbe Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2017 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include "sbeSecureMemRegionManager.H"
#include "sbetrace.H"
#include "sbeutil.H"
#include "sbeglobals.H"
#ifndef __SBEFW_SEEPROM__
SBESecureMemRegionManager mainStoreSecMemRegionManager(
&SBE_GLOBAL->mainMemRegions[0],
MAX_MAIN_STORE_REGIONS);
SBEOccSramSecMemRegionManager occSramSecRegionManager(
&SBE_GLOBAL->occSramRegions[0],
MAX_OCC_SRAM_REGIONS);
secureMemRegion_t SBESecureMemRegionManager::getPartialRegionSize(
const secureMemRegion_t i_region)
{
secureMemRegion_t ret = {};
for(size_t i = 0; i < iv_regionsOpenCnt; i++)
{
uint64_t minStartAddr = i_region.startAddress < iv_memRegions[i].startAddress ?
i_region.startAddress : iv_memRegions[i].startAddress;
uint64_t iRegionEndAddress = i_region.startAddress + i_region.size - 1;
uint64_t existingRegionEndAddress = iv_memRegions[i].startAddress + iv_memRegions[i].size - 1;
uint64_t maxEndAddr = iRegionEndAddress >= existingRegionEndAddress ?
iRegionEndAddress : existingRegionEndAddress;
// detect overlap
if((maxEndAddr - minStartAddr + 1) < (i_region.size + iv_memRegions[i].size))
{
ret = iv_memRegions[i];
// Give preference to first region
if(i_region.startAddress >= iv_memRegions[i].startAddress &&
i_region.startAddress < (iv_memRegions[i].startAddress +
iv_memRegions[i].size))
{
// Return the existing window to the extent of input window
ret.startAddress = i_region.startAddress;
ret.size = iv_memRegions[i].startAddress + iv_memRegions[i].size
- i_region.startAddress;
if(ret.size > i_region.size)
ret.size = i_region.size;
break;
}
}
}
return ret;
}
#endif //__SBEFW_SEEPROM__
#ifdef __SBEFW_SEEPROM__
// Public functions
sbeSecondaryResponse SBESecureMemRegionManager::add(const uint64_t i_startAddr,
const uint32_t i_size,
const uint8_t i_mode)
{
#define SBE_FUNC "SBESecureMemRegionManager::add"
sbeSecondaryResponse rc = SBE_SEC_OPERATION_SUCCESSFUL;
do
{
if(getPartialRegionSize({i_startAddr, i_size, i_mode}).mode)
{
SBE_ERROR(SBE_FUNC" SBE_SEC_MEM_REGION_AMEND_ATTEMPTED");
rc = SBE_SEC_MEM_REGION_AMEND_ATTEMPTED;
break;
}
if(iv_regionsOpenCnt >= iv_maxRegions)
{
SBE_ERROR(SBE_FUNC" SBE_SEC_MAXIMUM_MEM_REGION_EXCEEDED");
rc = SBE_SEC_MAXIMUM_MEM_REGION_EXCEEDED;
break;
}
SBE_INFO(SBE_FUNC" Adding region Mem[0x%08X%08X], size[0x%08X]",
SBE::higher32BWord(i_startAddr),
SBE::lower32BWord(i_startAddr),
i_size);
iv_memRegions[iv_regionsOpenCnt++] = {i_startAddr, i_size, i_mode};
SBE_INFO(SBE_FUNC" after addition iv_regionsOpenCnt [%d]",
iv_regionsOpenCnt);
} while(0);
return rc;
#undef SBE_FUNC
}
sbeSecondaryResponse SBESecureMemRegionManager::remove(const uint64_t i_startAddr)
{
#define SBE_FUNC "SBESecureMemRegionManager::remove";
size_t i = 0;
sbeSecondaryResponse rc = SBE_SEC_OPERATION_SUCCESSFUL;
for(; i < iv_regionsOpenCnt; i++)
{
if(i_startAddr == iv_memRegions[i].startAddress)
{
break;
}
}
if(i < iv_regionsOpenCnt)
{
SBE_INFO(SBE_FUNC" Deleting region i[%d], Mem[0x%08X%08X], size[0x%08X]",
i,
SBE::higher32BWord(iv_memRegions[i].startAddress),
SBE::lower32BWord(iv_memRegions[i].startAddress),
iv_memRegions[i].size);
// Remove the empty slot and maintain contiguous list
for(size_t j = i; j < iv_regionsOpenCnt-1; j++)
{
iv_memRegions[j].startAddress = iv_memRegions[j+1].startAddress;
iv_memRegions[j].size = iv_memRegions[j+1].size;
iv_memRegions[j].mode = iv_memRegions[j+1].mode;
}
iv_regionsOpenCnt--;
SBE_INFO(SBE_FUNC" After deletion : iv_regionsOpenCnt[%d]", iv_regionsOpenCnt);
}
else
{
SBE_ERROR(SBE_FUNC" SBE_SEC_MEM_REGION_NOT_FOUND");
rc = SBE_SEC_MEM_REGION_NOT_FOUND;
}
return rc;
#undef SBE_FUNC
}
#endif //__SBEFW_SEEPROM__
#ifndef __SBEFW_SEEPROM__
sbeSecondaryResponse SBESecureMemRegionManager::isAccessAllowed(
secureMemRegion_t i_region)
{
#define SBE_FUNC "SBESecureMemRegionManager::isAccessAllowed"
sbeSecondaryResponse rc = SBE_SEC_OPERATION_SUCCESSFUL;
if(SBE_GLOBAL->sbeFWSecurityEnabled)
{
while(i_region.size > 0)
{
secureMemRegion_t foundregion = getPartialRegionSize(i_region);
// Check if the found region has allowable access level
// and that the region overlap is from the beginning itself
if((i_region.mode & foundregion.mode) &&
(i_region.startAddress == foundregion.startAddress))
{
SBE_INFO(SBE_FUNC" foundRegion Mem[0x%08X%08X], size[0x%08X]",
SBE::higher32BWord(foundregion.startAddress),
SBE::lower32BWord(foundregion.startAddress),
foundregion.size);
i_region.size -= foundregion.size;
i_region.startAddress += foundregion.size;
}
else
{
SBE_ERROR(SBE_FUNC" Non secure access to memory blocked "
"Addr[0x%08X%08X] Size[0x%08X]",
SBE::higher32BWord(i_region.startAddress),
SBE::lower32BWord(i_region.startAddress),
i_region.size);
rc = SBE_SEC_BLACKLISTED_MEM_ACCESS;
break;
}
}
}
return rc;
#undef SBE_FUNC
}
#endif //__SBEFW_SEEPROM__
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