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. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
34 * $FreeBSD: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
41 * Machine dependent constants for x86_64.
45 * Round p (pointer or byte index) up to a correctly-aligned value
46 * for all data types (int, long, ...). The result is unsigned int
47 * and must be cast to any desired pointer type.
50 #define _ALIGNBYTES (sizeof(long) - 1)
53 #define _ALIGN(p) (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
57 #define _MACHINE x86_64
60 #define _MACHINE_ARCH x86_64
64 #define MACHINE "x86_64"
67 #define MACHINE_ARCH "x86_64"
71 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
72 * remain compatible between UP and SMP builds.
74 * WARNING! CPUMASK macros in include/cpumask.h must also be adjusted,
75 * as well as any assembly. Be sure that _CPUMASK_ELEMENTS
76 * is always correct so incompatible assembly #error's out
77 * during the kernel compile.
79 * WARNING! To raise SMP_MAXCPU further we probably need to reserve
80 * more KVM space via MPPTDI (platform/pc64/include/pmap.h),
81 * depends on SMP_MAXCPU * sizeof(struct privatedata).
83 #define SMP_MAXCPU 256
84 #define MAXCPU SMP_MAXCPU
86 #define ALIGNBYTES _ALIGNBYTES
87 #define ALIGN(p) _ALIGN(p)
89 /* JG license? from fbsd/src/sys/amd64/include/param.h */
90 /* level 1 == page table */
91 #define NPTEPGSHIFT 9 /* LOG2(NPTEPG) */
92 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
93 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
94 #define PAGE_MASK (PAGE_SIZE-1)
95 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
97 /* level 2 == page directory */
98 #define NPDEPGSHIFT 9 /* LOG2(NPDEPG) */
99 #define PDRSHIFT 21 /* LOG2(NBPDR) */
100 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
101 #define PDRMASK (NBPDR-1)
102 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
104 /* level 3 == page directory pointer table */
105 #define NPDPEPGSHIFT 9 /* LOG2(NPDPEPG) */
106 #define PDPSHIFT 30 /* LOG2(NBPDP) */
107 #define NBPDP (1<<PDPSHIFT) /* bytes/page dir ptr table */
108 #define PDPMASK (NBPDP-1)
109 #define NPDPEPG (PAGE_SIZE/(sizeof (pdp_entry_t)))
112 #define NPML4EPGSHIFT 9 /* LOG2(NPML4EPG) */
113 #define PML4SHIFT 39 /* LOG2(NPML4) */
114 #define NPML4 (1UL<<PML4SHIFT)/* bytes/page map level4 table */
115 #define NBPML4 (1ul<<PML4SHIFT)/* bytes/page map lev4 table */
116 #define PML4MASK (NPML4-1)
117 #define NPML4EPG (PAGE_SIZE/(sizeof (pml4_entry_t)))
120 * Virtual address sign-extension and mask. If bit 47 is set then
121 * set all higher bits.
123 #define PML4_SIGNMASK 0xFFFF800000000000LU
127 #define SEG_SIZE (1<<SEG_SHIFT) /* bytes per mmu segment (level 1) */
128 #define SEG_MASK (SEG_SIZE-1)
130 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
131 #define DEV_BSIZE (1<<DEV_BSHIFT)
132 #define DEV_BMASK (DEV_BSIZE - 1)
134 #ifndef BLKDEV_IOSIZE
135 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
137 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
138 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
139 #define MAXDUMPPGS (MAXPHYS/PAGE_SIZE)
141 #define IOPAGES 2 /* pages of i/o permission bitmap */
142 #define UPAGES 4 /* pages of u-area */
145 * Ceiling on amount of swblock kva space, can be changed via
146 * kern.maxswzone /boot/loader.conf variable. On 64 bit machines
147 * the kernel has a 512G address space, and we do not want to allow
148 * more than half of that to be used for this purpose.
150 * Approximately (size / 192 x 16 x PAGE_SIZE) bytes of swap. This
151 * comes to approximately 1GB of swap space per 1MB of kernel memory.
152 * Actually using 512G of swap will tie up a big chunk (512M) of physical
155 #ifndef VM_SWZONE_SIZE_MAX
156 #define VM_SWZONE_SIZE_MAX (256L * 1024L * 1024 * 1024)
160 * Ceiling on size of buffer cache (really only effects write queueing,
161 * the VM page cache is not effected), can be changed via
162 * kern.maxbcache /boot/loader.conf variable.
164 * This value is unbounded on 64-bit boxes, boot code will limit the
165 * buffer cache size to a portion of available physical memory.
167 #ifndef VM_BCACHE_SIZE_MAX
168 #define VM_BCACHE_SIZE_MAX 0
172 * Some macros for units conversion
175 /* clicks to bytes */
176 #define ctob(x) ((x)<<PAGE_SHIFT)
178 /* bytes to clicks */
179 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
182 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
183 * want to shift an unsigned type to avoid sign extension and we don't
184 * want to widen `bytes' unnecessarily. Assume that the result fits in
187 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
188 (sizeof (bytes) > sizeof(long) \
189 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
190 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
192 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
193 ((off_t)(db) << DEV_BSHIFT)
196 * Mach derived conversion macros
198 #define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(unsigned long)(PAGE_MASK))
199 #define trunc_page(x) ((unsigned long)(x) & ~(unsigned long)(PAGE_MASK))
200 #define trunc_2mpage(x) ((unsigned long)(x) & ~(unsigned long)PDRMASK)
201 #define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~(unsigned long)PDRMASK)
203 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
204 #define atop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
206 #define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
208 #define x86_64_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
209 #define x86_64_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
211 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
216 * We put here the definition of two debugging macros/function which
217 * are very convenient to have available.
218 * The macro is called TSTMP() and is used to timestamp events in the
219 * kernel using the TSC register, and export them to userland through
220 * the sysctl variable debug.timestamp, which is a circular buffer
221 * holding pairs of u_int32_t variables <timestamp, argument> .
222 * They can be retrieved with something like
224 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
226 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
227 * try to grab any locks or block interrupts or identify which CPU it
228 * is running on. You are supposed to know what to do if you use it.
230 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
231 * config file, otherwise they default to an empty block.
234 #ifdef KERN_TIMESTAMP
235 extern void _TSTMP(u_int32_t argument);
236 #define TSTMP(class, unit, event, par) _TSTMP( \
237 (((class) & 0x0f) << 28 ) | \
238 (((unit) & 0x0f) << 24 ) | \
239 (((event) & 0xff) << 16 ) | \
240 (((par) & 0xffff) ) )
242 #else /* !KERN_TIMESTAMP */
244 #define TSTMP(class, unit, event, par) _TSTMP(0)
245 #endif /* !KERN_TIMESTAMP */
248 #endif /* !_CPU_PARAM_H_ */