kernel - Introduce lightweight buffers
[dragonfly.git] / sys / platform / vkernel / 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 * Only machine-dependant code should ever include this file. MI
27 * code and header files do NOT include this file. e.g. sys/globaldata.h
28 * should not include this file.
29 *
30 * $FreeBSD: src/sys/i386/include/globaldata.h,v 1.11.2.1 2000/05/16 06:58:10 dillon Exp $
eec2b734 31 * $DragonFly: src/sys/platform/vkernel/include/globaldata.h,v 1.8 2008/04/28 07:05:07 dillon Exp $
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32 */
33
34#ifndef _MACHINE_GLOBALDATA_H_
35#define _MACHINE_GLOBALDATA_H_
36
37#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
38
39#ifndef _SYS_GLOBALDATA_H_
40#include <sys/globaldata.h> /* struct globaldata */
41#endif
42#ifndef _SYS_THREAD_H_
43#include <sys/thread.h> /* struct thread */
44#endif
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45#ifndef _SYS_VKERNEL_H_
46#include <sys/vkernel.h> /* vpte_t */
47#endif
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48#ifndef _MACHINE_SEGMENTS_H_
49#include <machine/segments.h> /* struct segment_descriptor */
50#endif
51#ifndef _MACHINE_TSS_H_
52#include <machine/tss.h> /* struct i386tss */
53#endif
54#ifndef _MACHINE_NPX_H_
55#include <machine/npx.h>
56#endif
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57#ifndef _CPU_LWBUF_H_
58#include <cpu/lwbuf.h>
59#endif
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60
61/*
62 * Note on interrupt control. Pending interrupts not yet dispatched are
63 * marked in gd_fpending, gd_ipending, or gd_spending. Once dispatched
64 * the interrupt's pending bit is cleared and the interrupt is masked.
65 * Upon completion the interrupt is unmasked.
66 *
67 * For edge triggered interrupts interrupts may be enabled again at this
68 * point and if they occur before the interrupt service routine is complete
69 * the service routine will loop.
70 *
71 * The current thread's cpl is stored in the thread structure.
72 *
73 * Note: the embedded globaldata and/or the mdglobaldata structure
74 * may exceed the size of a page.
75 */
76struct mdglobaldata {
77 struct globaldata mi;
78 struct segment_descriptor gd_common_tssd;
79 struct segment_descriptor *gd_tss_gdt;
80 struct thread *gd_npxthread;
81 struct i386tss gd_common_tss;
5c5185ae 82 struct lwbuf_free_kvp_list gd_lwbuf_fpages; /* lwbuf: free kva */
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83 union savefpu gd_savefpu; /* fast bcopy/zero temp fpu save area */
84 int gd_fpu_lock; /* fast bcopy/zero cpu lock */
85 int gd_fpending; /* fast interrupt pending */
86 int gd_ipending; /* normal interrupt pending */
87 int gd_spending; /* software interrupt pending */
88 int gd_sdelayed; /* delayed software ints */
89 int gd_currentldt;
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90 int unused003;
91 int unused002;
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92 u_int unused001;
93 u_int gd_other_cpus;
94 u_int gd_ss_eflags;
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95 vpte_t *gd_CMAP1; /* pointer to pte for CADDR1 */
96 vpte_t *gd_CMAP2;
97 vpte_t *gd_CMAP3;
98 vpte_t *gd_PMAP1;
99
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100 caddr_t gd_CADDR1;
101 caddr_t gd_CADDR2;
102 caddr_t gd_CADDR3;
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103 vpte_t *gd_PADDR1;
104
105 /*
106 * Page table mappings, see get_ptbase()
107 */
108 vpte_t *gd_PT1map; /* points into privatedata */
109 vpte_t *gd_PT1pdir; /* KVA of page directory */
110 vpte_t *gd_PT1pde; /* pointer to pde */
111 vpte_t *gd_PT2map;
112 vpte_t *gd_PT2pdir;
113 vpte_t *gd_PT2pde;
114 int gd_PTflip;
115
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116 vpte_t *gd_PT3map; /* used from preemptive interrupt */
117 vpte_t *gd_PT3pdir;
118 vpte_t *gd_PT3pde;
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119};
120
121#define MDGLOBALDATA_BASEALLOC_SIZE \
122 ((sizeof(struct mdglobaldata) + PAGE_MASK) & ~PAGE_MASK)
123#define MDGLOBALDATA_BASEALLOC_PAGES \
124 (MDGLOBALDATA_BASEALLOC_SIZE / PAGE_SIZE)
125#define MDGLOBALDATA_PAD \
126 (MDGLOBALDATA_BASEALLOC_SIZE - sizeof(struct mdglobaldata))
127
128/*
129 * This is the upper (0xff800000) address space layout that is per-cpu.
130 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
131 * each AP. genassym helps export this to the assembler code.
132 *
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133 * WARNING! This structure must be segment-aligned and portions within the
134 * structure must also be segment-aligned. The structure typically
135 * takes 3 segments per cpu (12MB).
a7231bde 136 */
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137#define PRIVATESPACE_SEGPAD \
138 (SEG_SIZE - \
139 ((sizeof(struct mdglobaldata) + MDGLOBALDATA_PAD + PAGE_SIZE * 4 + \
140 UPAGES * PAGE_SIZE) % SEG_SIZE)) \
141
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142struct privatespace {
143 /* main data page */
144 struct mdglobaldata mdglobaldata;
145 char __filler0[MDGLOBALDATA_PAD];
146
147 /* mapping pages - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */
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148 char CPAGE1[PAGE_SIZE];
149 char CPAGE2[PAGE_SIZE];
150 char CPAGE3[PAGE_SIZE];
151 vpte_t PPAGE1[PAGE_SIZE / sizeof(vpte_t)];
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152
153 /* idle stack (UPAGES pages) */
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154 char idlestack[UPAGES * PAGE_SIZE];
155
156 /* we must PAD to SEG_SIZE */
157 char __filler1[PRIVATESPACE_SEGPAD];
158 vpte_t PT1MAP[SEG_SIZE / sizeof(vpte_t)];
159 vpte_t PT2MAP[SEG_SIZE / sizeof(vpte_t)];
eec2b734 160 vpte_t PT3MAP[SEG_SIZE / sizeof(vpte_t)];
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161};
162#define mdcpu ((struct mdglobaldata *)_get_mycpu())
163
164#endif
165
166#ifdef _KERNEL
167
8a9d8995 168extern struct privatespace *CPU_prvspace;
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169
170#endif
171
172#endif