![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to param.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [CSRG BSD Unix] / 43BSDTahoe / sys / h|
Return to param.h CVS log | Up to [CSRG BSD Unix] / 43BSDTahoe / sys / h |
1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: *
6: * @(#)param.h 7.5 (Berkeley) 6/5/87
7: */
8:
9: #define BSD 43 /* 4.3 * 10, as cpp doesn't do floats */
10: #define BSD4_3 1
11:
12: /*
13: * Machine-independent constants
14: */
15: #define NMOUNT 20 /* number of mountable file systems */
16: /* NMOUNT must be <= 255 unless c_mdev (cmap.h) is expanded */
17: #define MSWAPX NMOUNT /* pseudo mount table index for swapdev */
18: #define MAXUPRC 40 /* max processes per user */
19: #define NOFILE 64 /* max open files per process */
20: #define CANBSIZ 256 /* max size of typewriter line */
21: #define NCARGS 20480 /* # characters in exec arglist */
22: #define MAXINTERP 32 /* maximum interpreter file name length */
23: #define NGROUPS 16 /* max number groups */
24: #define MAXHOSTNAMELEN 64 /* maximum hostname size */
25:
26: #define NOGROUP 65535 /* marker for empty group set member */
27:
28: /*
29: * Priorities
30: */
31: #define PSWP 0
32: #define PINOD 10
33: #define PRIBIO 20
34: #define PRIUBA 24
35: #define PZERO 25
36: #define PPIPE 26
37: #define PWAIT 30
38: #define PLOCK 35
39: #define PSLEP 40
40: #define PUSER 50
41:
42: #define NZERO 0
43:
44: #ifndef KERNEL
45: #include <sys/types.h>
46: #else
47: #ifndef LOCORE
48: #include "types.h"
49: #endif
50: #endif
51:
52: /*
53: * Signals
54: */
55: #ifdef KERNEL
56: #include "signal.h"
57: #else
58: #include <signal.h>
59: #endif
60:
61: #define ISSIG(p) \
62: ((p)->p_sig && ((p)->p_flag&STRC || \
63: ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig())
64:
65: /*
66: * Machine type dependent parameters.
67: */
68: #ifdef KERNEL
69: #include "../machine/machparam.h"
70: #else
71: #include <machine/machparam.h>
72: #endif
73:
74: #define NBPW sizeof(int) /* number of bytes in an integer */
75:
76: #define NULL 0
77: #define CMASK 022 /* default mask for file creation */
78: #define NODEV (dev_t)(-1)
79:
80: /*
81: * Clustering of hardware pages on machines with ridiculously small
82: * page sizes is done here. The paging subsystem deals with units of
83: * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each.
84: *
85: * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
86: */
87: #define CLBYTES (CLSIZE*NBPG)
88: #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
89: #define claligned(x) ((((int)(x))&CLOFSET)==0)
90: #define CLOFF CLOFSET
91: #define CLSHIFT (PGSHIFT+CLSIZELOG2)
92:
93: #if CLSIZE==1
94: #define clbase(i) (i)
95: #define clrnd(i) (i)
96: #else
97: /* give the base virtual address (first of CLSIZE) */
98: #define clbase(i) ((i) &~ (CLSIZE-1))
99: /* round a number of clicks up to a whole cluster */
100: #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
101: #endif
102:
103: /* CBLOCK is the size of a clist block, must be power of 2 */
104: #define CBLOCK 64
105: #define CBSIZE (CBLOCK - sizeof(struct cblock *)) /* data chars/clist */
106: #define CROUND (CBLOCK - 1) /* clist rounding */
107:
108: /*
109: * File system parameters and macros.
110: *
111: * The file system is made out of blocks of at most MAXBSIZE units,
112: * with smaller units (fragments) only in the last direct block.
113: * MAXBSIZE primarily determines the size of buffers in the buffer
114: * pool. It may be made larger without any effect on existing
115: * file systems; however making it smaller make make some file
116: * systems unmountable.
117: *
118: * Note that the blocked devices are assumed to have DEV_BSIZE
119: * "sectors" and that fragments must be some multiple of this size.
120: * Block devices are read in BLKDEV_IOSIZE units. This number must
121: * be a power of two and in the range of
122: * DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE
123: * This size has no effect upon the file system, but is usually set
124: * to the block size of the root file system, so as to maximize the
125: * speed of ``fsck''.
126: */
127: #define MAXBSIZE 8192
128: #define MAXFRAG 8
129:
130: /*
131: * MAXPATHLEN defines the longest permissable path length
132: * after expanding symbolic links. It is used to allocate
133: * a temporary buffer from the buffer pool in which to do the
134: * name expansion, hence should be a power of two, and must
135: * be less than or equal to MAXBSIZE.
136: * MAXSYMLINKS defines the maximum number of symbolic links
137: * that may be expanded in a path name. It should be set high
138: * enough to allow all legitimate uses, but halt infinite loops
139: * reasonably quickly.
140: */
141: #define MAXPATHLEN 1024
142: #define MAXSYMLINKS 8
143:
144: /*
145: * Constants for setting the parameters of the kernel memory allocator.
146: *
147: * 2 ** MINBUCKET is the smallest unit of memory that will be
148: * allocated. It must be at least large enough to hold a pointer.
149: *
150: * Units of memory less or equal to MAXALLOCSAVE will permanently
151: * allocate physical memory; requests for these size pieces of
152: * memory are quite fast. Allocations greater than MAXALLOCSAVE must
153: * always allocate and free physical memory; requests for these
154: * size allocations should be done infrequently as they will be slow.
155: * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14)
156: * and MAXALLOCSIZE must be a power of two.
157: */
158: #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
159: #define MAXALLOCSAVE (2 * CLBYTES)
160:
161: /*
162: * bit map related macros
163: */
164: #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
165: #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
166: #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
167: #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
168:
169: /*
170: * Macros for fast min/max.
171: */
172: #define MIN(a,b) (((a)<(b))?(a):(b))
173: #define MAX(a,b) (((a)>(b))?(a):(b))
174:
175: /*
176: * Macros for counting and rounding.
177: */
178: #ifndef howmany
179: #define howmany(x, y) (((x)+((y)-1))/(y))
180: #endif
181: #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
182: #define powerof2(x) ((((x)-1)&(x))==0)
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.