1 // SPDX-License-Identifier: GPL-2.0-only
2 // dump_psb. (c) 2004, Dave Jones, Red Hat Inc.
3
4 #include <fcntl.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <unistd.h>
9
10 #define _GNU_SOURCE
11 #include <getopt.h>
12
13 #include <sys/mman.h>
14
15 #define LEN (0x100000 - 0xc0000)
16 #define OFFSET (0xc0000)
17
18 #ifndef __packed
19 #define __packed __attribute((packed))
20 #endif
21
22 static long relevant;
23
24 static const int fid_to_mult[32] = {
25 110, 115, 120, 125, 50, 55, 60, 65,
26 70, 75, 80, 85, 90, 95, 100, 105,
27 30, 190, 40, 200, 130, 135, 140, 210,
28 150, 225, 160, 165, 170, 180, -1, -1,
29 };
30
31 static const int vid_to_voltage[32] = {
32 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
33 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
34 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
35 1075, 1050, 1024, 1000, 975, 950, 925, 0,
36 };
37
38 struct psb_header {
39 char signature[10];
40 u_char version;
41 u_char flags;
42 u_short settlingtime;
43 u_char res1;
44 u_char numpst;
45 } __packed;
46
47 struct pst_header {
48 u_int32_t cpuid;
49 u_char fsb;
50 u_char maxfid;
51 u_char startvid;
52 u_char numpstates;
53 } __packed;
54
55 static u_int fsb;
56 static u_int sgtc;
57
58 static int
59 decode_pst(char *p, int npstates)
60 {
61 int i;
62 int freq, fid, vid;
63
64 for (i = 0; i < npstates; ++i) {
65 fid = *p++;
66 vid = *p++;
67 freq = 100 * fid_to_mult[fid] * fsb;
68
69 printf(" %2d %8dkHz FID %02x (%2d.%01d) VID %02x (%4dmV)\n",
70 i,
71 freq,
72 fid, fid_to_mult[fid]/10, fid_to_mult[fid]%10,
73 vid, vid_to_voltage[vid]);
74 }
75
76 return 0;
77 }
78
79 static
80 void decode_psb(char *p, int numpst)
81 {
82 int i;
83 struct psb_header *psb;
84 struct pst_header *pst;
85
86 psb = (struct psb_header*) p;
87
88 if (psb->version != 0x12)
89 return;
90
91 printf("PSB version: %hhx flags: %hhx settling time %hhuus res1 %hhx num pst %hhu\n",
92 psb->version,
93 psb->flags,
94 psb->settlingtime,
95 psb->res1,
96 psb->numpst);
97 sgtc = psb->settlingtime * 100;
98
99 if (sgtc < 10000)
100 sgtc = 10000;
101
102 p = ((char *) psb) + sizeof(struct psb_header);
103
104 if (numpst < 0)
105 numpst = psb->numpst;
106 else
107 printf("Overriding number of pst :%d\n", numpst);
108
109 for (i = 0; i < numpst; i++) {
110 pst = (struct pst_header*) p;
111
112 if (relevant != 0) {
113 if (relevant!= pst->cpuid)
114 goto next_one;
115 }
116
117 printf(" PST %d cpuid %.3x fsb %hhu mfid %hhx svid %hhx numberstates %hhu\n",
118 i+1,
119 pst->cpuid,
120 pst->fsb,
121 pst->maxfid,
122 pst->startvid,
123 pst->numpstates);
124
125 fsb = pst->fsb;
126 decode_pst(p + sizeof(struct pst_header), pst->numpstates);
127
128 next_one:
129 p += sizeof(struct pst_header) + 2*pst->numpstates;
130 }
131
132 }
133
134 static struct option info_opts[] = {
135 {"numpst", no_argument, NULL, 'n'},
136 };
137
138 void print_help(void)
139 {
140 printf ("Usage: dump_psb [options]\n");
141 printf ("Options:\n");
142 printf (" -n, --numpst Set number of PST tables to scan\n");
143 printf (" -r, --relevant Only display PSTs relevant to cpuid N\n");
144 }
145
146 int
147 main(int argc, char *argv[])
148 {
149 int fd;
150 int numpst=-1;
151 int ret=0, cont=1;
152 char *mem = NULL;
153 char *p;
154
155 do {
156 ret = getopt_long(argc, argv, "hr:n:", info_opts, NULL);
157 switch (ret){
158 case '?':
159 case 'h':
160 print_help();
161 cont = 0;
162 break;
163 case 'r':
164 relevant = strtol(optarg, NULL, 16);
165 break;
166 case 'n':
167 numpst = strtol(optarg, NULL, 10);
168 break;
169 case -1:
170 cont = 0;
171 break;
172 }
173
174 } while(cont);
175
176 fd = open("/dev/mem", O_RDONLY);
177 if (fd < 0) {
178 printf ("Couldn't open /dev/mem. Are you root?\n");
179 exit(1);
180 }
181
182 mem = mmap(mem, 0x100000 - 0xc0000, PROT_READ, MAP_SHARED, fd, 0xc0000);
183 close(fd);
184
185 for (p = mem; p - mem < LEN; p+=16) {
186 if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
187 decode_psb(p, numpst);
188 break;
189 }
190 }
191
192 munmap(mem, LEN);
193 return 0;
194 }
195
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