thread stage 6: Move thread stack management from the proc structure to
[dragonfly.git] / sys / platform / pc32 / include / globaldata.h
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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 $
7e1d4bf4 27 * $DragonFly: src/sys/platform/pc32/include/globaldata.h,v 1.7 2003/06/19 06:26:08 dillon Exp $
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28 */
29
30/*
31 * This structure maps out the global data that needs to be kept on a
32 * per-cpu basis. genassym uses this to generate offsets for the assembler
33 * code, which also provides external symbols so that C can get at them as
34 * though they were really globals.
35 *
36 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
37 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
38 * The reason for doing it via a struct is so that an array of pointers
39 * to each CPU's data can be set up for things like "check curproc on all
40 * other processors"
41 */
42struct globaldata {
43 struct privatespace *gd_prvspace; /* self-reference */
84b592ba 44 struct thread *gd_curthread;
af0bff84 45 struct thread *gd_npxthread;
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46 struct timeval gd_switchtime;
47 struct i386tss gd_common_tss;
48 int gd_switchticks;
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49 int gd_freethreadcnt; /* YYY */
50 TAILQ_HEAD(,thread) gd_freethreads; /* YYY */
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51 struct segment_descriptor gd_common_tssd;
52 struct segment_descriptor *gd_tss_gdt;
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 u_int gd_astpending;
84b592ba 72 struct thread gd_idlethread;
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73};
74
75#ifdef SMP
76/*
77 * This is the upper (0xff800000) address space layout that is per-cpu.
78 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
79 * each AP. genassym helps export this to the assembler code.
80 */
81struct privatespace {
82 /* page 0 - data page */
83 struct globaldata globaldata;
84 char __filler0[PAGE_SIZE - sizeof(struct globaldata)];
85
86 /* page 1..4 - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */
87 char CPAGE1[PAGE_SIZE];
88 char CPAGE2[PAGE_SIZE];
89 char CPAGE3[PAGE_SIZE];
90 char PPAGE1[PAGE_SIZE];
91
92 /* page 5..4+UPAGES - idle stack (UPAGES pages) */
93 char idlestack[UPAGES * PAGE_SIZE];
94};
95
96extern struct privatespace SMP_prvspace[];
97
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98#else
99
100extern struct globaldata UP_globaldata;
101
984263bc 102#endif
3020e3be 103