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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * William Jolitz.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * @(#)param.h 5.8 (Berkeley) 6/28/91
37: */
38:
39: /*
40: * Machine dependent constants for Intel 386.
41: */
42:
43: #define MACHINE "i386"
44:
45: /*
46: * Round p (pointer or byte index) up to a correctly-aligned value
47: * for all data types (int, long, ...). The result is u_int and
48: * must be cast to any desired pointer type.
49: */
50: #define ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1))
51:
52: #define NBPG 4096 /* bytes/page */
53: #define PGOFSET (NBPG-1) /* byte offset into page */
54: #define PGSHIFT 12 /* LOG2(NBPG) */
55: #define NPTEPG (NBPG/(sizeof (struct pte)))
56:
57: #define NBPDR (1024*NBPG) /* bytes/page dir */
58: #define PDROFSET (NBPDR-1) /* byte offset into page dir */
59: #define PDRSHIFT 22 /* LOG2(NBPDR) */
60:
61: #define KERNBASE 0xFE000000 /* start of kernel virtual */
62: #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
63:
64: #define DEV_BSIZE 512
65: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
66: #define BLKDEV_IOSIZE 2048
67: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
68:
69: #define CLSIZE 1
70: #define CLSIZELOG2 0
71:
72: /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
73: #define SSIZE 1 /* initial stack size/NBPG */
74: #define SINCR 1 /* increment of stack/NBPG */
75:
76: #define UPAGES 2 /* pages of u-area */
77:
78: /*
79: * Constants related to network buffer management.
80: * MCLBYTES must be no larger than CLBYTES (the software page size), and,
81: * on machines that exchange pages of input or output buffers with mbuf
82: * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
83: * of the hardware page size.
84: */
85: #define MSIZE 128 /* size of an mbuf */
86: #define MCLBYTES 1024
87: #define MCLSHIFT 10
88: #define MCLOFSET (MCLBYTES - 1)
89: #ifndef NMBCLUSTERS
90: #ifdef GATEWAY
91: #define NMBCLUSTERS 512 /* map size, max cluster allocation */
92: #else
93: #define NMBCLUSTERS 256 /* map size, max cluster allocation */
94: #endif
95: #endif
96:
97: /*
98: * Size of kernel malloc arena in CLBYTES-sized logical pages
99: */
100: #ifndef NKMEMCLUSTERS
101: #define NKMEMCLUSTERS (2048*1024/CLBYTES)
102: #endif
103: /*
104: * Some macros for units conversion
105: */
106: /* Core clicks (4096 bytes) to segments and vice versa */
107: #define ctos(x) (x)
108: #define stoc(x) (x)
109:
110: /* Core clicks (4096 bytes) to disk blocks */
111: #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
112: #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
113: #define dtob(x) ((x)<<DEV_BSHIFT)
114:
115: /* clicks to bytes */
116: #define ctob(x) ((x)<<PGSHIFT)
117:
118: /* bytes to clicks */
119: #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
120:
121: #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
122: ((unsigned)(bytes) >> DEV_BSHIFT)
123: #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
124: ((unsigned)(db) << DEV_BSHIFT)
125:
126: /*
127: * Map a ``block device block'' to a file system block.
128: * This should be device dependent, and will be if we
129: * add an entry to cdevsw/bdevsw for that purpose.
130: * For now though just use DEV_BSIZE.
131: */
132: #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
133:
134: /*
135: * Mach derived conversion macros
136: */
137: #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1))
138: #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1))
139: #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
140: #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
141: #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT)
142: #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT)
143: #define i386_btop(x) ((unsigned)(x) >> PGSHIFT)
144: #define i386_ptob(x) ((unsigned)(x) << PGSHIFT)
145:
146: #ifdef KERNEL
147: #ifndef LOCORE
148: int cpuspeed;
149: #endif
150: #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); }
151:
152: #else
153: #define DELAY(n) { register int N = (n); while (--N > 0); }
154: #endif
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