1 /*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * All advertising materials mentioning features or use of this software
10 * must display the following acknowledgement:
11 * This product includes software developed by the University of
12 * California, Lawrence Berkeley Laboratory.
13 *
14 * %sccs.include.redist.c%
15 *
16 * @(#)param.h 8.3 (Berkeley) 05/14/95
17 *
18 * from: $Header: param.h,v 1.13 92/11/26 02:04:38 torek Exp $ (LBL)
19 */
20
21 /*
22 * Machine dependent constants for Sun-4c (SPARCstation)
23 */
24 #define MACHINE "sparc"
25 #define NCPUS 1
26
27 #ifdef KERNEL /* XXX */
28 #include <machine/cpu.h> /* XXX */
29 #endif /* XXX */
30
31 /*
32 * Round p (pointer or byte index) up to a correctly-aligned value for
33 * the machine's strictest data type. The result is u_int and must be
34 * cast to any desired pointer type.
35 */
36 #define ALIGNBYTES 7
37 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
38
39 #define NBPG 4096 /* bytes/page */
40 #define PGOFSET (NBPG-1) /* byte offset into page */
41 #define PGSHIFT 12 /* log2(NBPG) */
42
43 #define KERNBASE 0xf8000000 /* start of kernel virtual space */
44 #define KERNTEXTOFF 0xf8004000 /* start of kernel text */
45 #define BTOPKERNBASE ((u_long)KERNBASE >> PG_SHIFT)
46
47 #define DEV_BSIZE 512
48 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
49 #define BLKDEV_IOSIZE 2048
50 #define MAXPHYS (64 * 1024)
51
52 #define CLSIZE 1
53 #define CLSIZELOG2 0
54
55 /* NOTE: SSIZE and UPAGES must be multiples of CLSIZE */
56 #define SSIZE 1 /* initial stack size/NBPG */
57 #define UPAGES 2 /* pages of u-area */
58
59 /*
60 * Constants related to network buffer management.
61 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
62 * on machines that exchange pages of input or output buffers with mbuf
63 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
64 * of the hardware page size.
65 */
66 #define MSIZE 128 /* size of an mbuf */
67 #define MCLBYTES 2048 /* enough for whole Ethernet packet */
68 #define MCLSHIFT 11 /* log2(MCLBYTES) */
69 #define MCLOFSET (MCLBYTES - 1)
70
71 #ifndef NMBCLUSTERS
72 #ifdef GATEWAY
73 #define NMBCLUSTERS 512 /* map size, max cluster allocation */
74 #else
75 #define NMBCLUSTERS 256 /* map size, max cluster allocation */
76 #endif
77 #endif
78
79 /*
80 * Size of kernel malloc arena in CLBYTES-sized logical pages.
81 */
82 #ifndef NKMEMCLUSTERS
83 #define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES)
84 #endif
85
86 /* pages ("clicks") (4096 bytes) to disk blocks */
87 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
88 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
89 #define dtob(x) ((x) << DEV_BSHIFT)
90
91 /* pages to bytes */
92 #define ctob(x) ((x) << PGSHIFT)
93
94 /* bytes to pages */
95 #define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT)
96
97 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
98 ((bytes) >> DEV_BSHIFT)
99 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
100 ((db) << DEV_BSHIFT)
101
102 /*
103 * Map a ``block device block'' to a file system block.
104 * This should be device dependent, and should use the bsize
105 * field from the disk label.
106 * For now though just use DEV_BSIZE.
107 */
108 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
109
110 #ifdef KERNEL
111 #ifndef LOCORE
112 #define DELAY(n) delay(n)
113 #endif
114 #else
115 #define DELAY(n) { register volatile int N = (n); while (--N > 0); }
116 #endif
117
118 #ifndef _SIMPLELOCK_H_
119 #define _SIMPLELOCK_H_
120 /*
121 * A simple spin lock.
122 *
123 * This structure only sets one bit of data, but is sized based on the
124 * minimum word size that can be operated on by the hardware test-and-set
125 * instruction. It is only needed for multiprocessors, as uniprocessors
126 * will always run to completion or a sleep. It is an error to hold one
127 * of these locks while a process is sleeping.
128 */
129 struct simplelock {
130 int lock_data;
131 };
132
133 #if !defined(DEBUG) && NCPUS > 1
134 /*
135 * The simple-lock routines are the primitives out of which the lock
136 * package is built. The machine-dependent code must implement an
137 * atomic test_and_set operation that indivisibly sets the simple lock
138 * to non-zero and returns its old value. It also assumes that the
139 * setting of the lock to zero below is indivisible. Simple locks may
140 * only be used for exclusive locks.
141 */
142 static __inline void
simple_lock_init(lkp)143 simple_lock_init(lkp)
144 struct simplelock *lkp;
145 {
146
147 lkp->lock_data = 0;
148 }
149
150 static __inline void
simple_lock(lkp)151 simple_lock(lkp)
152 __volatile struct simplelock *lkp;
153 {
154
155 while (test_and_set(&lkp->lock_data))
156 continue;
157 }
158
159 static __inline int
simple_lock_try(lkp)160 simple_lock_try(lkp)
161 __volatile struct simplelock *lkp;
162 {
163
164 return (!test_and_set(&lkp->lock_data))
165 }
166
167 static __inline void
168 simple_unlock(lkp)
169 __volatile struct simplelock *lkp;
170 {
171
172 lkp->lock_data = 0;
173 }
174 #endif /* NCPUS > 1 */
175 #endif /* !_SIMPLELOCK_H_ */
176