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/* IBM_PROLOG_BEGIN_TAG
* This is an automatically generated prolog.
*
* $Source: src/include/kernel/cpu.H $
*
* IBM CONFIDENTIAL
*
* COPYRIGHT International Business Machines Corp. 2010-2012
*
* 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 other-
* wise divested of its trade secrets, irrespective of what has
* been deposited with the U.S. Copyright Office.
*
* Origin: 30
*
* IBM_PROLOG_END_TAG
*/
/** @file cpu.H
* @brief Defines kernel information and functions about CPUs.
*
* In this kernel the term CPU refers to a hardware thread (SMT), not core.
*/
#ifndef __KERNEL_CPU_H
#define __KERNEL_CPU_H
#include <kernel/types.h>
#include <arch/ppc.H>
#include <builtins.h>
#include <sys/sync.h>
// Thread ID support only, Power8 (8 threads).
#define KERNEL_MAX_SUPPORTED_CPUS (8 * 16 * 8) // Sockets, cores, threads.
class Scheduler;
/** @struct cpu_t
* @brief Stores per-CPU kernel information.
*
* @note kernel_stack and master need to be at fixed locations in this
* structure due to usages in start.S (see ppcconsts.S).
*
* - kernel_stack is a double-word at cpu_t[0 bytes].
* - master is a byte at cpu_t[12 bytes].
*/
struct cpu_t
{
/** Stack to use while in kernel mode. */
void* kernel_stack;
/** ID of the CPU (PIR value) */
cpuid_t cpu;
struct
{
/** If the CPU is the master */
bool master:1;
/** If the CPU is active */
bool active:1;
/** If the CPU is winkled */
bool winkled:1;
/** Ensure alignment of master attribute for asm code. */
uint64_t __reserved_master:29;
} PACKED;
/** Pointer to the scheduler for this CPU (may not be unique) */
Scheduler* scheduler;
/** Location for scheduler to store per-CPU data, currently used
* for the local run-queue for processor affinity.
*/
void* scheduler_extra;
/** Location for task delay-list, managed by TimeManager. */
void* delay_list;
/** Pointer to the idle task for this CPU */
task_t* idle_task;
/** XSCOM mutex to serialize access per CPU */
mutex_t xscom_mutex;
/** counter for executePeriodics */
size_t periodic_count;
/** Sequence ID of CPU initialization. */
uint64_t cpu_start_seqid;
};
/** @fn getCpuId
* @brief Read the PIR value to determine the cpuid_t of this CPU.
*/
ALWAYS_INLINE
inline cpuid_t getCpuId()
{
return getPIR() & (KERNEL_MAX_SUPPORTED_CPUS - 1);
}
#endif
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