freebsd-dev/sys/alpha/include/globaldata.h
Jason Evans 0384fff8c5 Major update to the way synchronization is done in the kernel. Highlights
include:

* Mutual exclusion is used instead of spl*().  See mutex(9).  (Note: The
  alpha port is still in transition and currently uses both.)

* Per-CPU idle processes.

* Interrupts are run in their own separate kernel threads and can be
  preempted (i386 only).

Partially contributed by:	BSDi (BSD/OS)
Submissions by (at least):	cp, dfr, dillon, grog, jake, jhb, sheldonh
2000-09-07 01:33:02 +00:00

80 lines
3.0 KiB
C

/*-
* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
* All rights reserved.
*
* 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.
*
* 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 _MACHINE_GLOBALDATA_H_
#define _MACHINE_GLOBALDATA_H_
#ifdef _KERNEL
#include <sys/queue.h>
/*
* This structure maps out the global data that needs to be kept on a
* per-cpu basis. genassym uses this to generate offsets for the assembler
* code, which also provides external symbols so that C can get at them as
* though they were really globals. This structure is pointed to by
* the per-cpu system value (see alpha_pal_rdval() and alpha_pal_wrval()).
* Inside the kernel, the globally reserved register t7 is used to
* point at the globaldata structure.
*/
struct globaldata {
struct alpha_pcb gd_idlepcb; /* pcb for idling */
struct proc *gd_curproc; /* current process */
struct proc *gd_idleproc; /* idle process */
struct proc *gd_fpcurproc; /* fp state owner */
struct pcb *gd_curpcb; /* current pcb */
struct timeval gd_switchtime;
int gd_switchticks;
u_int gd_cpuno; /* this cpu number */
u_int gd_other_cpus; /* all other cpus */
int gd_inside_intr;
u_int64_t gd_idlepcbphys; /* pa of gd_idlepcb */
u_int64_t gd_pending_ipis; /* pending IPI events */
u_int32_t gd_next_asn; /* next ASN to allocate */
u_int32_t gd_current_asngen; /* ASN rollover check */
u_int32_t gd_intr_nesting_level; /* interrupt recursion */
u_int gd_astpending;
SLIST_ENTRY(globaldata) gd_allcpu;
#ifdef KTR_PERCPU
volatile int gd_ktr_idx; /* Index into trace table */
char *gd_ktr_buf;
char gd_ktr_buf_data[0];
#endif
};
SLIST_HEAD(cpuhead, globaldata);
extern struct cpuhead cpuhead;
void globaldata_init(struct globaldata *pcpu, int cpuno, size_t sz);
struct globaldata *globaldata_find(int cpuno);
#endif /* _KERNEL */
#endif /* !_MACHINE_GLOBALDATA_H_ */