/*
* Copyright (c) 2001 Wind River Systems, Inc.
* All rights reserved.
* Written by: John Baldwin <jhb@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_PCPU_H_
#define _SYS_PCPU_H_
#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif
#ifdef LOCORE
#error "no assembler-serviceable parts inside"
#endif
#include <sys/queue.h>
#include <sys/vmmeter.h>
#include <machine/pcpu.h>
struct pcb;
struct thread;
/*
* This structure maps out the global data that needs to be kept on a
* per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
* macros defined in <machine/pcpu.h>. Machine dependent fields are
* defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
*/
struct pcpu {
struct thread *pc_curthread; /* Current thread */
struct thread *pc_idlethread; /* Idle thread */
struct thread *pc_fpcurthread; /* Fp state owner */
struct thread *pc_deadthread; /* Zombie thread or NULL */
struct pcb *pc_curpcb; /* Current pcb */
struct bintime pc_switchtime;
int pc_switchticks;
u_int pc_cpuid; /* This cpu number */
u_int pc_cpumask; /* This cpu mask */
u_int pc_other_cpus; /* Mask of all other cpus */
SLIST_ENTRY(pcpu) pc_allcpu;
struct lock_list_entry *pc_spinlocks;
#ifdef KTR_PERCPU
int pc_ktr_idx; /* Index into trace table */
char *pc_ktr_buf;
#endif
PCPU_MD_FIELDS;
struct vmmeter pc_cnt; /* VM stats counters */
};
SLIST_HEAD(cpuhead, pcpu);
extern struct cpuhead cpuhead;
#define CURPROC (curthread->td_proc)
#define curkse (curthread->td_kse)
#define curksegrp (curthread->td_ksegrp)
#define curproc (curthread->td_proc)
#define curthread PCPU_GET(curthread)
/*
* MI PCPU support functions
*
* PCPU_LAZY_INC() - Lazily increment a per-cpu stats counter, without
* guarenteeing atomicity or even necessarily consistency.
*
* XXX we need to create MD primitives to support
* this to guarentee at least some level of consistency,
* i.e., to prevent us from totally corrupting the
* counters due to preemption in a multi-instruction
* increment sequence for architectures that do not
* support single-instruction memory increments.
*/
#define PCPU_LAZY_INC(var) (++*PCPU_PTR(var))
/*
* Machine dependent callouts. cpu_pcpu_init() is responsible for
* initializing machine dependent fields of struct pcpu, and
* db_show_mdpcpu() is responsible for handling machine dependent
* fields for the DDB 'show pcpu' command.
*/
void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
void db_show_mdpcpu(struct pcpu *pcpu);
void pcpu_destroy(struct pcpu *pcpu);
struct pcpu *pcpu_find(u_int cpuid);
void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
#endif /* !_SYS_PCPU_H_ */
