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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/secureboot/base/purge.C $ */
/* */
/* IBM CONFIDENTIAL */
/* */
/* COPYRIGHT International Business Machines Corp. 2013 */
/* */
/* p1 */
/* */
/* Object Code Only (OCO) source materials */
/* Licensed Internal Code Source Materials */
/* IBM HostBoot Licensed Internal Code */
/* */
/* The source code for this program is not published or otherwise */
/* divested of its trade secrets, irrespective of what has been */
/* deposited with the U.S. Copyright Office. */
/* */
/* Origin: 30 */
/* */
/* 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 Attemped 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());
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.
* @devdesc Purge operation never completed.
*/
l_errl =
new ERRORLOG::ErrlEntry(ERRORLOG::ERRL_SEV_UNRECOVERABLE,
MOD_SECURE_BLINDPURGE,
RC_PURGEOP_FAIL_COMPLETE,
data);
break;
}
} while(0);
return l_errl;
}
}
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