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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/runtime/fakepayload.H $ */
/* */
/* 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 */
#ifndef __RUNTIME_FAKEPAYLOAD_H
#define __RUNTIME_FAKEPAYLOAD_H
/** @file fakepayload.H
* @brief Interfaces for loading a 'fake' payload when a payload is not
* present.
*
* The purpose of the fake payload is to be able to exercise the Hostboot
* shutdown path, even when there is not a real payload.
*
* This payload will simply nap all of the processors.
*/
#include <stdint.h>
#include <arch/ppc.H>
namespace RUNTIME
{
/** @class FakePayload
*
* @brief Handles loading of the fake payload.
*
* Places the payload into the area of memory determined by the
* PAYLOAD_BASE / PAYLOAD_ENTRY attributes.
*
* @note This class does not perform verification that the addresses
* in the attributes are actually reasonable values. It is assumed
* that attribute verification (ex. for SecureBoot) will be done
* elsewhere in a central place for all payloads.
*/
class FakePayload
{
public:
/** Load payload into memory. */
static void load();
private:
/** The fake payload itself. */
static void payload()
__attribute__((no_instrument_function));
/** Size of the payload (in bytes). */
static const size_t size;
/** @brief Size of memory to securely erase before loading
* the payload.
*
* For SecureBoot we cannot trust anything the FSP has left in
* memory. While we're loading a payload function into memory,
* the FSP had access to memory and could have loaded exception
* handlers. We need to clear out at least this much space in
* order to ensure that none of the interrupt handlers could be
* residing in memory.
*/
static const size_t safeClearArea;
};
}
#endif
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