pcpu.h revision 47081 
1/*-
2 * Copyright (c) Peter Wemm <peter@netplex.com.au>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $Id: globaldata.h,v 1.8 1999/04/28 01:04:00 luoqi Exp $
27 */
28
29/*
30 * This structure maps out the global data that needs to be kept on a
31 * per-cpu basis.  genassym uses this to generate offsets for the assembler
32 * code, which also provides external symbols so that C can get at them as
33 * though they were really globals.
34 *
35 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
36 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
37 * The reason for doing it via a struct is so that an array of pointers
38 * to each CPU's data can be set up for things like "check curproc on all
39 * other processors"
40 */
41struct globaldata {
42	struct privatespace *gd_prvspace;	/* self-reference */
43	struct proc	*gd_curproc;
44	struct proc	*gd_npxproc;
45	struct pcb	*gd_curpcb;
46	struct timeval	gd_switchtime;
47	struct i386tss	gd_common_tss;
48	int		gd_switchticks;
49#ifdef VM86
50	struct segment_descriptor gd_common_tssd;
51	struct segment_descriptor *gd_tss_gdt;
52#endif
53#ifdef USER_LDT
54	int		gd_currentldt;
55#endif
56#ifdef SMP
57	u_int		gd_cpuid;
58	u_int		gd_cpu_lockid;
59	u_int		gd_other_cpus;
60	int		gd_inside_intr;
61	u_int		gd_ss_eflags;
62	pt_entry_t	*gd_prv_CMAP1;
63	pt_entry_t	*gd_prv_CMAP2;
64	pt_entry_t	*gd_prv_CMAP3;
65	pt_entry_t	*gd_prv_PMAP1;
66	caddr_t		gd_prv_CADDR1;
67	caddr_t		gd_prv_CADDR2;
68	caddr_t		gd_prv_CADDR3;
69	unsigned	*gd_prv_PADDR1;
70#endif
71};
72
73#ifdef SMP
74/*
75 * This is the upper (0xff800000) address space layout that is per-cpu.
76 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
77 * each AP.  genassym helps export this to the assembler code.
78 */
79struct privatespace {
80	/* page 0 - data page */
81	struct globaldata globaldata;
82	char		__filler0[PAGE_SIZE - sizeof(struct globaldata)];
83
84	/* page 1..4 - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */
85	char		CPAGE1[PAGE_SIZE];
86	char		CPAGE2[PAGE_SIZE];
87	char		CPAGE3[PAGE_SIZE];
88	char		PPAGE1[PAGE_SIZE];
89
90	/* page 5..4+UPAGES - idle stack (UPAGES pages) */
91	char		idlestack[UPAGES * PAGE_SIZE];
92};
93
94extern struct privatespace SMP_prvspace[];
95
96#endif
97