Register keyword removal
[dragonfly.git] / sys / ddb / db_access.c
CommitLineData
984263bc
MD
1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 *
26 * $FreeBSD: src/sys/ddb/db_access.c,v 1.15 1999/08/28 00:41:04 peter Exp $
ad0290bd 27 * $DragonFly: src/sys/ddb/db_access.c,v 1.3 2003/07/26 14:18:51 rob Exp $
984263bc
MD
28 */
29
30/*
31 * Author: David B. Golub, Carnegie Mellon University
32 * Date: 7/90
33 */
34#include <sys/param.h>
35
36#include <ddb/ddb.h>
37#include <ddb/db_access.h>
38
39/*
40 * Access unaligned data items on aligned (longword)
41 * boundaries.
42 */
43
44static unsigned db_extend[] = { /* table for sign-extending */
45 0,
46 0xFFFFFF80U,
47 0xFFFF8000U,
48 0xFF800000U
49};
50
51db_expr_t
52db_get_value(addr, size, is_signed)
53 db_addr_t addr;
ad0290bd 54 int size;
984263bc
MD
55 boolean_t is_signed;
56{
57 char data[sizeof(int)];
ad0290bd
RG
58 db_expr_t value;
59 int i;
984263bc
MD
60
61 db_read_bytes(addr, size, data);
62
63 value = 0;
64#if BYTE_MSF
65 for (i = 0; i < size; i++)
66#else /* BYTE_LSF */
67 for (i = size - 1; i >= 0; i--)
68#endif
69 {
70 value = (value << 8) + (data[i] & 0xFF);
71 }
72
73 if (size < 4) {
74 if (is_signed && (value & db_extend[size]) != 0)
75 value |= db_extend[size];
76 }
77 return (value);
78}
79
80void
81db_put_value(addr, size, value)
82 db_addr_t addr;
ad0290bd
RG
83 int size;
84 db_expr_t value;
984263bc
MD
85{
86 char data[sizeof(int)];
ad0290bd 87 int i;
984263bc
MD
88
89#if BYTE_MSF
90 for (i = size - 1; i >= 0; i--)
91#else /* BYTE_LSF */
92 for (i = 0; i < size; i++)
93#endif
94 {
95 data[i] = value & 0xFF;
96 value >>= 8;
97 }
98
99 db_write_bytes(addr, size, data);
100}
101