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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2012,2014 */
/* [+] 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 */
/**
* @file utils.H
*
* @brief Defines common utility elements for FAPI2 use.
*/
#ifndef FAPI2_UTILS_H_
#define FAPI2_UTILS_H_
#include <return_code.H>
#ifdef __ASSEMBLER__
#ifndef ULL
#define ULL(x) x
#endif
#else
#ifndef ULL
#define ULL(x) x##ull
#endif
#endif // __ASSEMBLER
/// Create a multi-bit mask of \a n bits starting at bit \a b
#ifndef BITS
#define BITS(b, n) ((ULL(0xffffffffffffffff) << (64 - (n))) >> (b))
#endif
/// Create a single bit mask at bit \a b
#ifndef BIT
#define BIT(b) BITS((b), 1)
#endif
#ifdef _BIG_ENDIAN
#define revle16(x) x
#define revle32(x) x
#define revle64(x) x
#else
uint16_t revle16(uint16_t i_x);
uint32_t revle32(uint32_t i_x);
uint64_t revle64(uint64_t i_x);
#endif
namespace fapi2
{
///
/// @brief Delay this thread. Hostboot will use the nanoseconds parameter
/// and make a syscall to nanosleep. While in the syscall, the hostboot
/// kernel will continue to consume CPU cycles as it looks for a runnable
/// task. When the delay time expires, the task becomes runnable and will soon
/// return from the syscall. Callers of delay() in the hostboot environment
/// will likely have to know the mHz clock speed they are running on and
/// compute a non-zero value for i_nanoSeconds.
///
/// On the FSP, it was sometimes acceptable to just provide zero for the
/// sleep delay time, causing the task to yield its time slice. By the
/// time the calling task could run again, it was pretty certain enough
/// host cycles had past. This is probably not acceptable in
/// the hostboot environment. Callers should calculate and provide a
/// sleep value in nanoseconds relative to host clock speed.
///
/// On FSP when VBU is the target, then the i_simCycles parameter will be
/// used instead. The FSP needs to use the simdispatcher client/server
/// API and issue a command to the awan to advance the simulation the
/// specified number of cycles.
///
/// On SBE when __FAPI_DELAY_SIM__ is defined, then the i_simCycles parameter
/// will be used instead and will use the number passed. The build parameter
/// __FAPI_DELAY_SIM_CYCLES__ allows the delay to adjust for the number of
/// simulation cycles that the PPE engine is running at. The delay algorithm
/// takes the i_simCycles parameter, subtracts the loop overhead instructions
/// times __FAPI_DELAY_SIM_CYCLES__ and then divides the remainder by the
/// number of loop instructions times __FAPI_DELAY_SIM_CYCLES__.
///
/// On SBE when __FAPI_DELAY_SIM__ is NOT defined, the nanoseconds parameter
/// will bus used to loop on the a call to pk_timebase32_get() function to
/// determine the elapsed time. pk_sleep() is NOT used as there are not
/// other threads to dispatch.
///
/// @param[in] i_nanoSeconds nanoseconds to sleep
/// @param[in] i_simCycles count of Awan cycles to advance
/// @param[in] i_fixed Determination, for DFT, if this time is
/// fixed or not. Defaults to non-fixed
///
/// @return ReturnCode. Zero on success, else platform specified error.
///
ReturnCode delay(uint64_t i_nanoSeconds,
uint64_t i_simCycles,
bool i_fixed = false);
}
#endif // FAPI2_UTILS_H_
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