Annotation of sys/arch/sh/include/param.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: param.h,v 1.4 2007/05/28 21:02:49 thib Exp $ */
2: /* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */
3:
4: /*-
5: * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
6: * Copyright (c) 1990 The Regents of the University of California.
7: * All rights reserved.
8: *
9: * This code is derived from software contributed to Berkeley by
10: * William Jolitz.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. 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: * SuperH dependent constants.
41: */
42:
43: #ifndef _SH_PARAM_H_
44: #define _SH_PARAM_H_
45:
46: #define _MACHINE_ARCH sh
47: #define MACHINE_ARCH "sh"
48:
49: #ifndef MID_MACHINE
50: #define MID_MACHINE MID_SH3
51: #endif
52:
53: #if defined(_KERNEL) && !defined(_LOCORE)
54: #include <sh/cpu.h>
55: #endif
56:
57: /*
58: * We use 4K pages on the sh3/sh4. Override the PAGE_* definitions
59: * to be compile-time constants.
60: */
61: #define PAGE_SHIFT 12
62: #define PAGE_SIZE (1 << PAGE_SHIFT)
63: #define PAGE_MASK (PAGE_SIZE - 1)
64:
65: #define PGSHIFT PAGE_SHIFT
66: #define NBPG PAGE_SIZE
67: #define PGOFSET PAGE_MASK
68:
69: /*
70: * Round p (pointer or byte index) up to a correctly-aligned value
71: * for all data types (int, long, ...). The result is u_int and
72: * must be cast to any desired pointer type.
73: *
74: * ALIGNED_POINTER is a boolean macro that checks whether an address
75: * is valid to fetch data elements of type t from on this architecture.
76: * This does not reflect the optimal alignment, just the possibility
77: * (within reasonable limits).
78: *
79: */
80: #define ALIGNBYTES (sizeof(int) - 1)
81: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
82: #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
83:
84: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
85: #define DEV_BSIZE (1 << DEV_BSHIFT)
86: #define BLKDEV_IOSIZE 2048
87: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
88:
89: /*
90: * u-space.
91: */
92: #define UPAGES 3 /* pages of u-area */
93: #define USPACE (UPAGES * NBPG) /* total size of u-area */
94: #define USPACE_ALIGN (0)
95: #if UPAGES == 1
96: #error "too small u-area"
97: #elif UPAGES == 2
98: #define P1_STACK /* kernel stack is P1-area */
99: #else
100: #undef P1_STACK /* kernel stack is P3-area */
101: #endif
102:
103: #ifndef MSGBUFSIZE
104: #define MSGBUFSIZE NBPG /* default message buffer size */
105: #endif
106:
107: /* pages to bytes */
108: #define btoc(x) (((x) + PAGE_MASK) >> PAGE_SHIFT)
109: #define ctob(x) ((x) << PAGE_SHIFT)
110:
111: /* pages to disk blocks */
112: #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT))
113: #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
114:
115: /* bytes to disk blocks */
116: #define btodb(x) ((x) >> DEV_BSHIFT)
117: #define dbtob(x) ((x) << DEV_BSHIFT)
118:
119: /*
120: * Constants related to network buffer management.
121: */
122: #define NMBCLUSTERS 4096 /* map size, max cluster allocation */
123:
124: /*
125: * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
126: * logical pages.
127: */
128: #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT)
129: #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT)
130:
131: #endif /* !_SH3_PARAM_H_ */
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