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1.1 root 1: /* param.h 4.12 81/06/11 */
2:
3: /*
4: * Tunable variables which do not usually vary per system.
5: *
6: * The sizes of most system tables are configured
7: * into each system description. The file system buffer
8: * cache size is assigned based on available memory.
9: * The tables whose sizes don't vary often are given here.
10: */
11:
12: #define NMOUNT 15 /* number of mountable file systems */
13: #define MSWAPX 15 /* pseudo mount table index for swapdev */
14: #define MAXUPRC 25 /* max processes per user */
15: #define SSIZE 4 /* initial stack size (*512 bytes) */
16: #define SINCR 4 /* increment of stack (*512 bytes) */
17: #define NOFILE 20 /* max open files per process */
18: /* NOFILE MUST NOT BE >= 31; SEE pte.h */
19: #define CANBSIZ 256 /* max size of typewriter line */
20: #define NCARGS 10240 /* # characters in exec arglist */
21:
22: /*
23: * priorities
24: * probably should not be
25: * altered too much
26: */
27:
28: #define PSWP 0
29: #define PINOD 10
30: #define PRIBIO 20
31: #define PRIUBA 24
32: #define PZERO 25
33: #define PPIPE 26
34: #define PWAIT 30
35: #define PSLEP 40
36: #define PUSER 50
37:
38: #define NZERO 20
39:
40: /*
41: * signals
42: * dont change
43: */
44:
45: #ifndef NSIG
46: #include <signal.h>
47: #endif
48:
49: /*
50: * Return values from tsleep().
51: */
52: #define TS_OK 0 /* normal wakeup */
53: #define TS_TIME 1 /* timed-out wakeup */
54: #define TS_SIG 2 /* asynchronous signal wakeup */
55:
56: /*
57: * fundamental constants of the implementation--
58: * cannot be changed easily.
59: */
60:
61: #define NBBY 8 /* number of bits in a byte */
62: #define NBPW sizeof(int) /* number of bytes in an integer */
63: #define NBPG 512
64: #define PGOFSET (NBPG-1) /* byte offset into page */
65: #define PGSHIFT 9 /* LOG2(NBPG) */
66:
67: #define UPAGES 8 /* pages of u-area */
68: #define NULL 0
69: #define CMASK 0 /* default mask for file creation */
70: #define NODEV (dev_t)(-1)
71: #define ROOTINO ((ino_t)2) /* i number of all roots */
72: #define SUPERB ((daddr_t)1) /* block number of the super block */
73: #define DIRSIZ 14 /* max characters per directory */
74:
75: /*
76: * Clustering of hardware pages on machines with ridiculously small
77: * page sizes is done here. The paging subsystem deals with units of
78: * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must
79: * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
80: * deals with the same size blocks that the file system uses.
81: *
82: * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
83: */
84: #define CLSIZE 2
85: #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
86:
87: /* give the base virtual address (first of CLSIZE) */
88: #define clbase(i) ((i) &~ (CLSIZE-1))
89:
90: /* round a number of clicks up to a whole cluster */
91: #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
92:
93: #if CLSIZE==1
94: #define BSIZE 512 /* size of secondary block (bytes) */
95: #define INOPB 8 /* 8 inodes per block */
96: #define BMASK 0777 /* BSIZE-1 */
97: #define BSHIFT 9 /* LOG2(BSIZE) */
98: #define NMASK 0177 /* NINDIR-1 */
99: #define NSHIFT 7 /* LOG2(NINDIR) */
100: #define NICINOD 100 /* number of superblock inodes */
101: #define NICFREE 50 /* number of superblock free blocks */
102:
103: #endif
104:
105: #if CLSIZE==2
106: #define BSIZE 1024
107: #define INOPB 16
108: #define BMASK 01777
109: #define BSHIFT 10
110: #define NMASK 0377
111: #define NSHIFT 8
112: #define NICINOD 100
113: #define NICFREE 178
114: #endif
115:
116: #if CLSIZE==4
117: #define BSIZE 2048
118: #define INOPB 32
119: #define BMASK 03777
120: #define BSHIFT 11
121: #define NMASK 0777
122: #define NSHIFT 9
123: #define NICINOD 100
124: #define NICFREE 434
125: #endif
126:
127: #ifndef INTRLVE
128: /* macros replacing interleaving functions */
129: #define dkblock(bp) ((bp)->b_blkno)
130: #define dkunit(bp) (minor((bp)->b_dev) >> 3)
131: #endif
132:
133: /* inumber to disk address and inumber to disk offset */
134: #define itod(x) ((daddr_t)((((unsigned)(x)+2*INOPB-1)/INOPB)))
135: #define itoo(x) ((int)(((x)+2*INOPB-1)%INOPB))
136:
137: /* file system blocks to disk blocks and back */
138: #define fsbtodb(b) ((b)*CLSIZE)
139: #define dbtofsb(b) ((b)/CLSIZE)
140:
141: #define NINDIR (BSIZE/sizeof(daddr_t))
142:
143: #define CBSIZE 28 /* number of chars in a clist block */
144: #define CROUND 0x1F /* clist rounding; sizeof(int *) + CBSIZE -1*/
145:
146: /*
147: * Macros for fast min/max
148: */
149: #define MIN(a,b) (((a)<(b))?(a):(b))
150: #define MAX(a,b) (((a)>(b))?(a):(b))
151:
152: /*
153: * Some macros for units conversion
154: */
155: /* Core clicks (512 bytes) to segments and vice versa */
156: #define ctos(x) (x)
157: #define stoc(x) (x)
158:
159: /* Core clicks (512 bytes) to disk blocks */
160: #define ctod(x) (x)
161:
162: /* clicks to bytes */
163: #define ctob(x) ((x)<<9)
164:
165: /* bytes to clicks */
166: #define btoc(x) ((((unsigned)(x)+511)>>9))
167:
168: #ifndef KERNEL
169: #include <sys/types.h>
170: #else
171: #include "../h/types.h"
172: #endif
173:
174: /*
175: * Machine-dependent bits and macros
176: */
177: #define UMODE PSL_CURMOD /* usermode bits */
178: #define USERMODE(ps) (((ps) & UMODE) == UMODE)
179:
180: #define BASEPRI(ps) (((ps) & PSL_IPL) != 0)
181:
182: /*
183: * Provide about n microseconds of delay
184: */
185: #define DELAY(n) { register int N = (n); while (--N > 0); }
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