1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* $OpenBSD: smpprobe.c,v 1.6 2004/03/09 19:12:13 tom Exp $ */
/*
* Copyright (c) 1997 Tobias Weingartner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/param.h>
#include <machine/biosvar.h>
#include "libsa.h"
extern int debug;
extern u_int cnvmem, extmem;
#define MP_FLOAT_SIG 0x5F504D5F /* _MP_ */
#define MP_CONF_SIG 0x504D4350 /* PCMP */
typedef struct _mp_float {
u_int32_t signature;
u_int32_t conf_addr;
u_int8_t length;
u_int8_t spec_rev;
u_int8_t checksum;
u_int8_t feature[5];
} mp_float_t;
static __inline int
mp_checksum(u_int8_t *ptr, int len)
{
register int i, sum = 0;
#ifdef DEBUG
printf("Checksum %p for %d\n", ptr, len);
#endif
for (i = 0; i < len; i++)
sum += *(ptr + i);
return (!(sum & 0xff));
}
static mp_float_t *
mp_probefloat(u_int8_t *ptr, int len)
{
mp_float_t *mpp = NULL;
int i;
#ifdef DEBUG
if (debug)
printf("Checking %p for %d\n", ptr, len);
#endif
for (i = 0; i < 1024; i++) {
mp_float_t *tmp = (mp_float_t*)(ptr + i);
if (tmp->signature == MP_FLOAT_SIG) {
printf("Found possible MP signature at: %p\n", ptr);
mpp = tmp;
break;
}
if ((tmp->signature == MP_FLOAT_SIG) &&
mp_checksum((u_int8_t *)tmp, tmp->length*16)) {
#ifdef DEBUG
if (debug)
printf("Found valid MP signature at: %p\n",
ptr);
#endif
mpp = tmp;
break;
}
}
return mpp;
}
void
smpprobe(void)
{
mp_float_t *mp = NULL;
/* Check EBDA */
if (!(mp = mp_probefloat((void *)((*((u_int32_t*)0x4e)) * 16), 1024)) &&
/* Check BIOS ROM 0xE0000 - 0xFFFFF */
!(mp = mp_probefloat((void *)(0xE0000), 0x1FFFF)) &&
/* Check last 1K of base RAM */
!(mp = mp_probefloat((void *)(cnvmem * 1024), 1024)) &&
/* Check last 1K of extended RAM XXX */
!(mp = mp_probefloat((void *)(extmem * 1024 - 1024), 1024))) {
/* No valid MP signature found */
#if DEBUG
if (debug)
printf("No valid MP signature found.\n");
#endif
return;
}
/* Valid MP signature found */
printf(" smp");
#if DEBUG
if (debug)
printf("Floating Structure:\n"
"\tSignature: %x\n"
"\tConfig at: %x\n"
"\tLength: %d\n"
"\tRev: 1.%d\n"
"\tFeature: %x %x %x %x %x\n",
mp->signature, mp->conf_addr, mp->length, mp->spec_rev,
mp->feature[0], mp->feature[1], mp->feature[2],
mp->feature[3], mp->feature[4]);
#endif
}
|
