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38 * @(#)param.h 8.3 (Berkeley) 4/4/95
39 * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $
40 * $DragonFly: src/sys/sys/param.h,v 1.37 2006/09/10 01:26:40 dillon Exp $
46 #define BSD 200307 /* XXX kern.osrevision */
47 #define BSD4_3 1 /* XXX obsolete */
48 #define BSD4_4 1 /* XXX obsolete */
51 * __DragonFly_version number. Note that the name and comment are pattern
52 * searched from conf/newvers.sh.
54 * Version changes should be documented in:
55 * doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
57 * 170000 - base development version after 1.6 branch
59 #undef __DragonFly_version
60 #define __DragonFly_version 170000 /* Master, propagated to newvers */
64 * __FreeBSD_version numbers for source compatibility. This is temporary
65 * along with the __FreeBSD__ define in gcc2. Note that gcc3 does not
66 * define __FreeBSD__ by default, only __DragonFly__.
68 #undef __FreeBSD_version
69 #define __FreeBSD_version 480101
77 #include <sys/types.h>
81 * Machine-independent constants (some used in following include files).
82 * Redefined constants are from POSIX 1003.1 limits file.
84 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
85 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
87 #include <sys/syslimits.h>
89 #define MAXCOMLEN 16 /* max command name remembered */
90 #define MAXINTERP 32 /* max interpreter file name length */
91 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */
92 #define MAXUPRC CHILD_MAX /* max simultaneous processes */
93 #define NCARGS ARG_MAX /* max bytes for an exec function */
94 #define NGROUPS NGROUPS_MAX /* max number groups */
95 #define NOFILE OPEN_MAX /* max open files per process */
96 #define NOGROUP 65535 /* marker for empty group set member */
97 #define MAXHOSTNAMELEN 256 /* max hostname size */
99 /* More types and definitions used throughout the kernel. */
101 #include <sys/cdefs.h>
102 #include <sys/errno.h>
103 #include <sys/time.h>
111 #include <sys/signal.h>
114 /* Machine type dependent parameters. */
115 #include <machine/param.h>
117 #include <machine/limits.h>
120 #define PCATCH 0x00000100 /* tsleep checks signals */
121 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */
122 #define PNORESCHED 0x00000400 /* No reschedule on wakeup */
123 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */
124 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */
125 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */
126 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */
127 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */
128 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu))
129 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK)
131 #define NZERO 0 /* default "nice" */
133 #define NBPW sizeof(int) /* number of bytes per word (integer) */
135 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
136 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
137 #define NOCDEV (cdev_t)(-1) /* non-existent device */
138 #define NOUDEV (udev_t)(-1) /* non-existent device */
139 #define NOMAJ 256 /* non-existent device */
143 #define NODEV (dev_t)(-1) /* non-existent device */
147 * File system parameters and macros.
149 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
150 * per block. MAXBSIZE may be made larger without effecting
151 * any existing filesystems as long as it does not exceed MAXPHYS,
152 * and may be made smaller at the risk of not being able to use
153 * filesystems which require a block size exceeding MAXBSIZE.
155 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
156 * minimum KVM memory reservation the kernel is willing to make.
157 * Filesystems can of course request smaller chunks. Actual
158 * backing memory uses a chunk size of a page (PAGE_SIZE).
160 * If you make BKVASIZE too small you risk seriously fragmenting
161 * the buffer KVM map which may slow things down a bit. If you
162 * make it too big the kernel will not be able to optimally use
163 * the KVM memory reserved for the buffer cache and will wind
164 * up with too-few buffers.
166 * The default is 16384, roughly 2x the block size used by a
167 * normal UFS filesystem.
169 #define MAXBSIZE 65536 /* must be power of 2 */
170 #define BKVASIZE 16384 /* must be power of 2 */
171 #define BKVAMASK (BKVASIZE-1)
175 * MAXPATHLEN defines the longest permissible path length after expanding
176 * symbolic links. It is used to allocate a temporary buffer from the buffer
177 * pool in which to do the name expansion, hence should be a power of two,
178 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
179 * maximum number of symbolic links that may be expanded in a path name.
180 * It should be set high enough to allow all legitimate uses, but halt
181 * infinite loops reasonably quickly.
183 #define MAXPATHLEN PATH_MAX
184 #define MAXSYMLINKS 32
186 /* Bit map related macros. */
187 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
188 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
189 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
190 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
192 /* Macros for counting and rounding. */
194 #define howmany(x, y) (((x)+((y)-1))/(y))
196 #define rounddown(x, y) (((x)/(y))*(y))
197 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
198 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
199 #define powerof2(x) ((((x)-1)&(x))==0)
201 /* Macros for min/max. */
202 #define MIN(a,b) (((a)<(b))?(a):(b))
203 #define MAX(a,b) (((a)>(b))?(a):(b))
206 * Constants for setting the parameters of the kernel memory allocator.
208 * 2 ** MINBUCKET is the smallest unit of memory that will be
209 * allocated. It must be at least large enough to hold a pointer.
211 * Units of memory less or equal to MAXALLOCSAVE will permanently
212 * allocate physical memory; requests for these size pieces of
213 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
214 * always allocate and free physical memory; requests for these
215 * size allocations should be done infrequently as they will be slow.
217 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
218 * MAXALLOCSIZE must be a power of two.
220 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
221 #define MAXALLOCSAVE (2 * PAGE_SIZE)
224 * Scale factor for scaled integers used to count %cpu time and load avgs.
226 * The number of CPU `tick's that map to a unique `%age' can be expressed
227 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
228 * can be calculated (assuming 32 bits) can be closely approximated using
229 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
231 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
232 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
234 #define FSHIFT 11 /* bits to right of fixed binary point */
235 #define FSCALE (1<<FSHIFT)
237 #define dbtoc(db) /* calculates devblks to pages */ \
238 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
240 #define ctodb(db) /* calculates pages to devblks */ \
241 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
245 * Make this available for most of the kernel. There were too many
246 * things that included sys/systm.h just for panic().
249 void panic (const char *, ...) __dead2 __printflike(1, 2);
253 #define htonl(x) __htonl(x)
256 #define htons(x) __htons(x)
259 #define ntohl(x) __ntohl(x)
262 #define ntohs(x) __ntohs(x)
265 #endif /* _SYS_PARAM_H_ */