Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / platform / pc32 / include / globaldata.h
CommitLineData
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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 * $FreeBSD: src/sys/i386/include/globaldata.h,v 1.11.2.1 2000/05/16 06:58:10 dillon 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 struct segment_descriptor gd_common_tssd;
50 struct segment_descriptor *gd_tss_gdt;
51#ifdef USER_LDT
52 int gd_currentldt;
53#endif
54#ifdef SMP
55 u_int gd_cpuid;
56 u_int gd_cpu_lockid;
57 u_int gd_other_cpus;
58 int gd_inside_intr;
59 u_int gd_ss_eflags;
60 pt_entry_t *gd_prv_CMAP1;
61 pt_entry_t *gd_prv_CMAP2;
62 pt_entry_t *gd_prv_CMAP3;
63 pt_entry_t *gd_prv_PMAP1;
64 caddr_t gd_prv_CADDR1;
65 caddr_t gd_prv_CADDR2;
66 caddr_t gd_prv_CADDR3;
67 unsigned *gd_prv_PADDR1;
68#endif
69 u_int gd_astpending;
70};
71
72#ifdef SMP
73/*
74 * This is the upper (0xff800000) address space layout that is per-cpu.
75 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
76 * each AP. genassym helps export this to the assembler code.
77 */
78struct privatespace {
79 /* page 0 - data page */
80 struct globaldata globaldata;
81 char __filler0[PAGE_SIZE - sizeof(struct globaldata)];
82
83 /* page 1..4 - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */
84 char CPAGE1[PAGE_SIZE];
85 char CPAGE2[PAGE_SIZE];
86 char CPAGE3[PAGE_SIZE];
87 char PPAGE1[PAGE_SIZE];
88
89 /* page 5..4+UPAGES - idle stack (UPAGES pages) */
90 char idlestack[UPAGES * PAGE_SIZE];
91};
92
93extern struct privatespace SMP_prvspace[];
94
95#endif