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/*-
* Copyright (c) Peter Wemm <peter@netplex.com.au>
* 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 <machine/segments.h>
#include <machine/tss.h>
/* XXX */
#ifdef KTR_PERCPU
#include <sys/ktr.h>
#endif
/*
* 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.
*
* The SMP parts are setup in pmap.c and locore.s for the BSP, and
* mp_machdep.c sets up the data for the AP's to "see" when they awake.
* The reason for doing it via a struct is so that an array of pointers
* to each CPU's data can be set up for things like "check curproc on all
* other processors"
*/
struct globaldata {
struct globaldata *gd_prvspace; /* self-reference */
struct proc *gd_curproc; /* current process */
struct proc *gd_idleproc; /* idle process */
struct proc *gd_npxproc;
struct pcb *gd_curpcb; /* current pcb */
struct timeval gd_switchtime;
struct i386tss gd_common_tss;
int gd_switchticks;
struct segment_descriptor gd_common_tssd;
struct segment_descriptor *gd_tss_gdt;
int gd_currentldt;
u_int gd_cpuid; /* this cpu number */
u_int gd_other_cpus; /* all other cpus */
SLIST_ENTRY(globaldata) gd_allcpu;
struct lock_list_entry *gd_spinlocks;
#ifdef KTR_PERCPU
volatile int gd_ktr_idx; /* Index into trace table */
char *gd_ktr_buf;
char gd_ktr_buf_data[KTR_SIZE];
#endif
};
#ifdef SMP
/*
* This is the upper (0xff800000) address space layout that is per-cpu.
* It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
* each AP. genassym helps export this to the assembler code.
*/
struct privatespace {
/* page 0 - data page */
struct globaldata globaldata;
char __filler0[PAGE_SIZE - sizeof(struct globaldata)];
/* page 1 - idle stack (UPAGES pages) */
char idlestack[UPAGES * PAGE_SIZE];
/* page 1+UPAGES... */
};
extern struct privatespace SMP_prvspace[];
#endif
#endif /* _KERNEL */
#endif /* ! _MACHINE_GLOBALDATA_H_ */
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