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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/secureboot/base/purge.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* COPYRIGHT International Business Machines Corp. 2013,2014 */
/* */
/* 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 <stdint.h>
#include <sys/task.h>
#include <sys/time.h>
#include <devicefw/userif.H>
#include <secureboot/secure_reasoncodes.H>
#include "purge.H"
namespace SECUREBOOT
{
errlHndl_t issueBlindPurge()
{
static const uint64_t PURGE_REG = 0x1001080e;
// Bits : Value
// 0 : 0b1 = Initiate Purge
// 1:4 : 0b0100 = Full Blind Purge
// 13:28 : 0x1000 = CGC is (512k / 128 byte line size)
// CGC means "Congruence Class", ie. cache row.
static const uint64_t PURGE_VALUE = 0xa000800000000000;
// Bit 0 - Purge Pending.
static const uint64_t PURGE_PENDING = 0x8000000000000000;
static const size_t RETRY_COUNT = 100;
static const size_t RETRY_WAIT_NS = ONE_CTX_SWITCH_NS;
errlHndl_t l_errl = NULL;
do
{
size_t coreId = (task_getcpuid() / 8) & 0xF;
uint64_t regAddr = PURGE_REG + 0x01000000 * coreId;
uint64_t data = 0;
size_t size = sizeof(data);
// Read purge register to ensure no operation is pending.
l_errl =
deviceRead(TARGETING::MASTER_PROCESSOR_CHIP_TARGET_SENTINEL,
&data, size,
DEVICE_SCOM_ADDRESS(regAddr));
if (l_errl)
{
break;
}
if (data & PURGE_PENDING)
{
/*@
* @errortype
* @moduleid SECUREBOOT::MOD_SECURE_BLINDPURGE
* @reasoncode SECUREBOOT::RC_PURGEOP_PENDING
* @userdata1 SCOM value.
* @userdata2 CPU ID (PIR) encountering failure.
* @devdesc Attempted to purge cache while purge operation
* was pending.
*/
l_errl =
new ERRORLOG::ErrlEntry(ERRORLOG::ERRL_SEV_UNRECOVERABLE,
MOD_SECURE_BLINDPURGE,
RC_PURGEOP_PENDING,
data, task_getcpuid());
// Probably a code bug
l_errl->addProcedureCallout( HWAS::EPUB_PRC_HB_CODE,
HWAS::SRCI_PRIORITY_HIGH );
// But there might be something wrong with the chip
// or the SBE image
l_errl->addHwCallout(
TARGETING::MASTER_PROCESSOR_CHIP_TARGET_SENTINEL,
HWAS::SRCI_PRIORITY_LOW,
HWAS::NO_DECONFIG,
HWAS::GARD_NULL );
break;
}
// Initiate purge operation
data = PURGE_VALUE;
l_errl =
deviceWrite(TARGETING::MASTER_PROCESSOR_CHIP_TARGET_SENTINEL,
&data, size,
DEVICE_SCOM_ADDRESS(regAddr));
if (l_errl)
{
break;
}
// Wait for purge to complete.
for(size_t i = 0; i < RETRY_COUNT; i++)
{
l_errl =
deviceRead(TARGETING::MASTER_PROCESSOR_CHIP_TARGET_SENTINEL,
&data, size,
DEVICE_SCOM_ADDRESS(regAddr));
if ((l_errl) || !(data & PURGE_PENDING))
{
break;
}
nanosleep(0, RETRY_WAIT_NS);
}
if (l_errl)
{
break;
}
if (data & PURGE_PENDING) // Ensure op did complete.
{
/*@
* @errortype
* @moduleid SECUREBOOT::MOD_SECURE_BLINDPURGE
* @reasoncode SECUREBOOT::RC_PURGEOP_FAIL_COMPLETE
* @userdata1 SCOM value of Reg 0x1001080E
* @devdesc Purge operation never completed.
*/
l_errl =
new ERRORLOG::ErrlEntry(ERRORLOG::ERRL_SEV_UNRECOVERABLE,
MOD_SECURE_BLINDPURGE,
RC_PURGEOP_FAIL_COMPLETE,
data);
// Most likely a hardware issue of some sort
l_errl->addHwCallout(
TARGETING::MASTER_PROCESSOR_CHIP_TARGET_SENTINEL,
HWAS::SRCI_PRIORITY_HIGH,
HWAS::NO_DECONFIG,
HWAS::GARD_NULL );
// Could also be a code bug
l_errl->addProcedureCallout( HWAS::EPUB_PRC_HB_CODE,
HWAS::SRCI_PRIORITY_MED );
break;
}
} while(0);
return l_errl;
}
}
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