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
decode_pst(char * p,int npstates)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
decode_psb(char * p,int numpst)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 
print_help(void)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
main(int argc,char * argv[])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