Annotation of sys/arch/amd64/include/param.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: param.h,v 1.14 2007/05/28 21:02:49 thib Exp $ */
2:
3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * William Jolitz.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. Neither the name of the University nor the names of its contributors
19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
34: * @(#)param.h 5.8 (Berkeley) 6/28/91
35: */
36:
37: #ifdef _KERNEL
38: #ifdef _LOCORE
39: #include <machine/psl.h>
40: #else
41: #include <machine/cpu.h>
42: #endif
43: #endif
44:
45: #define _MACHINE amd64
46: #define MACHINE "amd64"
47: #define _MACHINE_ARCH amd64
48: #define MACHINE_ARCH "amd64"
49: #define MID_MACHINE MID_AMD64
50:
51: /*
52: * Round p (pointer or byte index) up to a correctly-aligned value
53: * for all data types (int, long, ...). The result is u_long and
54: * must be cast to any desired pointer type.
55: *
56: * ALIGNED_POINTER is a boolean macro that checks whether an address
57: * is valid to fetch data elements of type t from on this architecture.
58: * This does not reflect the optimal alignment, just the possibility
59: * (within reasonable limits).
60: *
61: */
62: #define ALIGNBYTES (sizeof(long) - 1)
63: #define ALIGN(p) (((u_long)(p) + ALIGNBYTES) &~ALIGNBYTES)
64: #define ALIGNED_POINTER(p,t) 1
65:
66: #define PGSHIFT 12 /* LOG2(NBPG) */
67: #define NBPG (1 << PGSHIFT) /* bytes/page */
68: #define PGOFSET (NBPG-1) /* byte offset into page */
69:
70: #define PAGE_SHIFT 12
71: #define PAGE_SIZE (1 << PAGE_SHIFT)
72: #define PAGE_MASK (PAGE_SIZE - 1)
73:
74: #define NPTEPG (NBPG/(sizeof (pt_entry_t)))
75:
76: #define KERNBASE 0xffffffff80000000 /* start of kernel virtual space */
77: #define KERNTEXTOFF (KERNBASE+0x100000) /* start of kernel text */
78:
79: #define KERNTEXTOFF_HI 0xffffffff
80: #define KERNTEXTOFF_LO 0x80100000
81:
82: #define KERNBASE_HI 0xffffffff
83: #define KERNBASE_LO 0x80000000
84:
85: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
86: #define DEV_BSIZE (1 << DEV_BSHIFT)
87: #define BLKDEV_IOSIZE 2048
88: #ifndef MAXPHYS
89: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
90: #endif
91:
92: #define UPAGES 5 /* pages of u-area */
93: #define USPACE (UPAGES * NBPG) /* total size of u-area */
94: #define USPACE_ALIGN (0) /* u-area alignment 0-none */
95:
96: #ifndef MSGBUFSIZE
97: #define MSGBUFSIZE 4*NBPG /* default message buffer size */
98: #endif
99:
100: /*
101: * Constants related to network buffer management.
102: */
103: #define NMBCLUSTERS 6144 /* map size, max cluster allocation */
104:
105: /*
106: * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
107: * logical pages.
108: */
109: #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
110: #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
111:
112: /* pages ("clicks") to disk blocks */
113: #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
114: #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
115:
116: /* bytes to pages */
117: #define ctob(x) ((x) << PGSHIFT)
118: #define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
119:
120: /* bytes to disk blocks */
121: #define dbtob(x) ((x) << DEV_BSHIFT)
122: #define btodb(x) ((x) >> DEV_BSHIFT)
123:
124: /*
125: * Mach derived conversion macros
126: */
127: #define x86_round_pdr(x) \
128: ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
129: #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1))
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