kernel: Make SMP support default (and non-optional).
[dragonfly.git] / sys / cpu / x86_64 / include / param.h
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1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
c8fe38ae 3 * Copyright (c) 2008 The DragonFly Project.
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4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * William Jolitz.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
38 * $FreeBSD: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
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39 */
40
41#ifndef _CPU_PARAM_H_
42
43/*
44 * Do not prevent re-includes of <machine/param.h> if the file was included
45 * with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
46 */
47#ifndef _NO_NAMESPACE_POLLUTION
48#define _CPU_PARAM_H_
49#endif
50
51/*
02fc0ba7 52 * Machine dependent constants for x86_64.
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53 */
54#ifndef _CPU_PARAM_H1_
55#define _CPU_PARAM_H1_
56
57/*
58 * Round p (pointer or byte index) up to a correctly-aligned value
59 * for all data types (int, long, ...). The result is unsigned int
60 * and must be cast to any desired pointer type.
61 */
62#ifndef _ALIGNBYTES
63#define _ALIGNBYTES (sizeof(long) - 1)
64#endif
65#ifndef _ALIGN
66#define _ALIGN(p) (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
67#endif
68
02fc0ba7 69#ifndef _MACHINE
b2b3ffcd 70#define _MACHINE x86_64
fc3f9779 71#endif
02fc0ba7 72#ifndef _MACHINE_ARCH
b2b3ffcd 73#define _MACHINE_ARCH x86_64
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74#endif
75
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76#endif /* _CPU_PARAM_H1_ */
77
78#ifndef _NO_NAMESPACE_POLLUTION
79
02fc0ba7 80#ifndef MACHINE
b2b3ffcd 81#define MACHINE "x86_64"
fc3f9779 82#endif
02fc0ba7 83#ifndef MACHINE_ARCH
b2b3ffcd 84#define MACHINE_ARCH "x86_64"
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85#endif
86
87/*
88 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
89 * remain compatible between UP and SMP builds.
90 */
da23a592 91#define SMP_MAXCPU 63
fc3f9779 92#define MAXCPU SMP_MAXCPU
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93
94#define ALIGNBYTES _ALIGNBYTES
95#define ALIGN(p) _ALIGN(p)
96
c8fe38ae 97/* JG license? from fbsd/src/sys/amd64/include/param.h */
fc3f9779 98/* level 1 == page table */
c8fe38ae 99#define NPTEPGSHIFT 9 /* LOG2(NPTEPG) */
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100#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
101#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
102#define PAGE_MASK (PAGE_SIZE-1)
103#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
104
105/* level 2 == page directory */
c8fe38ae 106#define NPDEPGSHIFT 9 /* LOG2(NPDEPG) */
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107#define PDRSHIFT 21 /* LOG2(NBPDR) */
108#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
109#define PDRMASK (NBPDR-1)
110#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
111
112/* level 3 == page directory pointer table */
c8fe38ae 113#define NPDPEPGSHIFT 9 /* LOG2(NPDPEPG) */
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114#define PDPSHIFT 30 /* LOG2(NBPDP) */
115#define NBPDP (1<<PDPSHIFT) /* bytes/page dir ptr table */
116#define PDPMASK (NBPDP-1)
117#define NPDPEPG (PAGE_SIZE/(sizeof (pdp_entry_t)))
118
119/* level 4 */
c8fe38ae 120#define NPML4EPGSHIFT 9 /* LOG2(NPML4EPG) */
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121#define PML4SHIFT 39 /* LOG2(NPML4) */
122#define NPML4 (1UL<<PML4SHIFT)/* bytes/page map level4 table */
c8fe38ae 123#define NBPML4 (1ul<<PML4SHIFT)/* bytes/page map lev4 table */
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124#define PML4MASK (NPML4-1)
125#define NPML4EPG (PAGE_SIZE/(sizeof (pml4_entry_t)))
126
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127/*
128 * Virtual address sign-extension and mask. If bit 47 is set then
129 * set all higher bits.
130 */
131#define PML4_SIGNMASK 0xFFFF800000000000LU
132
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133/* for vkernel */
134#define SEG_SHIFT 21
135#define SEG_SIZE (1<<SEG_SHIFT) /* bytes per mmu segment (level 1) */
136#define SEG_MASK (SEG_SIZE-1)
137
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138#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
139#define DEV_BSIZE (1<<DEV_BSHIFT)
140#define DEV_BMASK (DEV_BSIZE - 1)
141
142#ifndef BLKDEV_IOSIZE
143#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
144#endif
1743f68f 145#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
fc3f9779 146#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
d83666e0 147#define MAXDUMPPGS (MAXPHYS/PAGE_SIZE)
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148
149#define IOPAGES 2 /* pages of i/o permission bitmap */
e40cfbd7 150#define UPAGES 4 /* pages of u-area */
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151
152/*
153 * Ceiling on amount of swblock kva space, can be changed via
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154 * kern.maxswzone /boot/loader.conf variable. On 64 bit machines
155 * the kernel has a 512G address space so reserving 512M of KVM
156 * is not a big deal.
79634a66 157 *
392e8d79 158 * Approximately (size / 160 x 32 x PAGE_SIZE) bytes of swap. This
79634a66 159 * comes to approximately 1GB of swap space per 1MB of kernel memory.
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160 * Actually using 512G of swap will tie up a big chunk (512M) of physical
161 * memory.
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162 */
163#ifndef VM_SWZONE_SIZE_MAX
392e8d79 164#define VM_SWZONE_SIZE_MAX (512L * 1024 * 1024)
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165#endif
166
167/*
168 * Ceiling on size of buffer cache (really only effects write queueing,
169 * the VM page cache is not effected), can be changed via
170 * kern.maxbcache /boot/loader.conf variable.
948209ce 171 *
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172 * This value is unbounded on 64-bit boxes, boot code will limit the
173 * buffer cache size to a portion of available physical memory.
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174 */
175#ifndef VM_BCACHE_SIZE_MAX
74d62460 176#define VM_BCACHE_SIZE_MAX 0
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177#endif
178
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179/*
180 * Some macros for units conversion
181 */
182
183/* clicks to bytes */
184#define ctob(x) ((x)<<PAGE_SHIFT)
185
186/* bytes to clicks */
187#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
188
189/*
190 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
191 * want to shift an unsigned type to avoid sign extension and we don't
192 * want to widen `bytes' unnecessarily. Assume that the result fits in
193 * a daddr_t.
194 */
195#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
196 (sizeof (bytes) > sizeof(long) \
197 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
198 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
199
200#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
201 ((off_t)(db) << DEV_BSHIFT)
202
203/*
204 * Mach derived conversion macros
205 */
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206#define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(unsigned long)(PAGE_MASK))
207#define trunc_page(x) ((unsigned long)(x) & ~(unsigned long)(PAGE_MASK))
208#define trunc_2mpage(x) ((unsigned long)(x) & ~(unsigned long)PDRMASK)
209#define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~(unsigned long)PDRMASK)
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210
211#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
c8fe38ae 212#define atop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
fc3f9779 213#endif
c8fe38ae 214#define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
fc3f9779 215
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216#define x86_64_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
217#define x86_64_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
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218
219#define pgtok(x) ((x) * (PAGE_SIZE / 1024))
220
221#ifdef _KERNEL
222
223/*
224 * We put here the definition of two debugging macros/function which
225 * are very convenient to have available.
226 * The macro is called TSTMP() and is used to timestamp events in the
227 * kernel using the TSC register, and export them to userland through
228 * the sysctl variable debug.timestamp, which is a circular buffer
229 * holding pairs of u_int32_t variables <timestamp, argument> .
230 * They can be retrieved with something like
231 *
232 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
233 *
234 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
235 * try to grab any locks or block interrupts or identify which CPU it
236 * is running on. You are supposed to know what to do if you use it.
237 *
238 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
239 * config file, otherwise they default to an empty block.
240 */
241
242#ifdef KERN_TIMESTAMP
243extern void _TSTMP(u_int32_t argument);
244#define TSTMP(class, unit, event, par) _TSTMP( \
245 (((class) & 0x0f) << 28 ) | \
246 (((unit) & 0x0f) << 24 ) | \
247 (((event) & 0xff) << 16 ) | \
248 (((par) & 0xffff) ) )
249
250#else /* !KERN_TIMESTAMP */
251#define _TSTMP(x) {}
252#define TSTMP(class, unit, event, par) _TSTMP(0)
253#endif /* !KERN_TIMESTAMP */
254#endif /* _KERNEL */
255
256#endif /* !_NO_NAMESPACE_POLLUTION */
257#endif /* !_CPU_PARAM_H_ */