2 * Copyright (c) 1990 The Regents of the University of California.
3 * Copyright (c) 2008 The DragonFly Project.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
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 $
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.
47 #ifndef _NO_NAMESPACE_POLLUTION
52 * Machine dependent constants for x86_64.
54 #ifndef _CPU_PARAM_H1_
55 #define _CPU_PARAM_H1_
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.
63 #define _ALIGNBYTES (sizeof(long) - 1)
66 #define _ALIGN(p) (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
70 #define _MACHINE x86_64
73 #define _MACHINE_ARCH x86_64
76 #endif /* _CPU_PARAM_H1_ */
78 #ifndef _NO_NAMESPACE_POLLUTION
81 #define MACHINE "x86_64"
84 #define MACHINE_ARCH "x86_64"
88 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
89 * remain compatible between UP and SMP builds.
93 #define MAXCPU SMP_MAXCPU
98 #define ALIGNBYTES _ALIGNBYTES
99 #define ALIGN(p) _ALIGN(p)
101 /* JG license? from fbsd/src/sys/amd64/include/param.h */
102 /* level 1 == page table */
103 #define NPTEPGSHIFT 9 /* LOG2(NPTEPG) */
104 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
105 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
106 #define PAGE_MASK (PAGE_SIZE-1)
107 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
109 /* level 2 == page directory */
110 #define NPDEPGSHIFT 9 /* LOG2(NPDEPG) */
111 #define PDRSHIFT 21 /* LOG2(NBPDR) */
112 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
113 #define PDRMASK (NBPDR-1)
114 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
116 /* level 3 == page directory pointer table */
117 #define NPDPEPGSHIFT 9 /* LOG2(NPDPEPG) */
118 #define PDPSHIFT 30 /* LOG2(NBPDP) */
119 #define NBPDP (1<<PDPSHIFT) /* bytes/page dir ptr table */
120 #define PDPMASK (NBPDP-1)
121 #define NPDPEPG (PAGE_SIZE/(sizeof (pdp_entry_t)))
124 #define NPML4EPGSHIFT 9 /* LOG2(NPML4EPG) */
125 #define PML4SHIFT 39 /* LOG2(NPML4) */
126 #define NPML4 (1UL<<PML4SHIFT)/* bytes/page map level4 table */
127 #define NBPML4 (1ul<<PML4SHIFT)/* bytes/page map lev4 table */
128 #define PML4MASK (NPML4-1)
129 #define NPML4EPG (PAGE_SIZE/(sizeof (pml4_entry_t)))
133 #define SEG_SIZE (1<<SEG_SHIFT) /* bytes per mmu segment (level 1) */
134 #define SEG_MASK (SEG_SIZE-1)
136 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
137 #define DEV_BSIZE (1<<DEV_BSHIFT)
138 #define DEV_BMASK (DEV_BSIZE - 1)
140 #ifndef BLKDEV_IOSIZE
141 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
143 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
144 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
145 #define MAXDUMPPGS (MAXPHYS/PAGE_SIZE)
147 #define IOPAGES 2 /* pages of i/o permission bitmap */
148 #define UPAGES 4 /* pages of u-area */
151 * Ceiling on amount of swblock kva space, can be changed via
152 * kern.maxswzone /boot/loader.conf variable. On 64 bit machines
153 * the kernel has a 512G address space so reserving 512M of KVM
156 * Approximately (size / 160 x 32 x PAGE_SIZE) bytes of swap. This
157 * comes to approximately 1GB of swap space per 1MB of kernel memory.
158 * Actually using 512G of swap will tie up a big chunk (512M) of physical
161 #ifndef VM_SWZONE_SIZE_MAX
162 #define VM_SWZONE_SIZE_MAX (512L * 1024 * 1024)
166 * Ceiling on size of buffer cache (really only effects write queueing,
167 * the VM page cache is not effected), can be changed via
168 * kern.maxbcache /boot/loader.conf variable.
170 * On x86_64 boxes this can also improve HAMMER's flushing and cache
171 * performance so use a much higher value than i386.
173 #ifndef VM_BCACHE_SIZE_MAX
174 #define VM_BCACHE_SIZE_MAX (1000L * 1024 * 1024)
178 * Some macros for units conversion
181 /* clicks to bytes */
182 #define ctob(x) ((x)<<PAGE_SHIFT)
184 /* bytes to clicks */
185 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
188 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
189 * want to shift an unsigned type to avoid sign extension and we don't
190 * want to widen `bytes' unnecessarily. Assume that the result fits in
193 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
194 (sizeof (bytes) > sizeof(long) \
195 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
196 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
198 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
199 ((off_t)(db) << DEV_BSHIFT)
202 * Mach derived conversion macros
204 #define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(unsigned long)(PAGE_MASK))
205 #define trunc_page(x) ((unsigned long)(x) & ~(unsigned long)(PAGE_MASK))
206 #define trunc_2mpage(x) ((unsigned long)(x) & ~(unsigned long)PDRMASK)
207 #define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~(unsigned long)PDRMASK)
209 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
210 #define atop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
212 #define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
214 #define x86_64_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
215 #define x86_64_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
217 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
222 * We put here the definition of two debugging macros/function which
223 * are very convenient to have available.
224 * The macro is called TSTMP() and is used to timestamp events in the
225 * kernel using the TSC register, and export them to userland through
226 * the sysctl variable debug.timestamp, which is a circular buffer
227 * holding pairs of u_int32_t variables <timestamp, argument> .
228 * They can be retrieved with something like
230 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
232 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
233 * try to grab any locks or block interrupts or identify which CPU it
234 * is running on. You are supposed to know what to do if you use it.
236 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
237 * config file, otherwise they default to an empty block.
240 #ifdef KERN_TIMESTAMP
241 extern void _TSTMP(u_int32_t argument);
242 #define TSTMP(class, unit, event, par) _TSTMP( \
243 (((class) & 0x0f) << 28 ) | \
244 (((unit) & 0x0f) << 24 ) | \
245 (((event) & 0xff) << 16 ) | \
246 (((par) & 0xffff) ) )
248 #else /* !KERN_TIMESTAMP */
250 #define TSTMP(class, unit, event, par) _TSTMP(0)
251 #endif /* !KERN_TIMESTAMP */
254 #endif /* !_NO_NAMESPACE_POLLUTION */
255 #endif /* !_CPU_PARAM_H_ */