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/** @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, Power7 (4 threads).
#define KERNEL_MAX_SUPPORTED_CPUS (4 * 8 * 4) // Sockets, cores, threads.
class Scheduler;
/** @struct cpu_t
* @brief Stores per-CPU kernel information.
*/
struct cpu_t
{
/** Stack to use while in kernel mode. */
void* kernel_stack;
/** ID of the CPU (PIR value) */
cpuid_t cpu;
/** If the CPU is the master */
bool master;
/** 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;
/** Pointer to the idle task for this CPU */
task_t* idle_task;
/** XSCOM mutex to serialize access per CPU */
mutex_t xscom_mutex;
};
/** @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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