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// SPDX-License-Identifier: GPL-2.0-only
// dump_psb. (c) 2004, Dave Jones, Red Hat Inc.
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define _GNU_SOURCE
#include <getopt.h>
#include <sys/mman.h>
#define LEN (0x100000 - 0xc0000)
#define OFFSET (0xc0000)
#ifndef __packed
#define __packed __attribute((packed))
#endif
static long relevant;
static const int fid_to_mult[32] = {
110, 115, 120, 125, 50, 55, 60, 65,
70, 75, 80, 85, 90, 95, 100, 105,
30, 190, 40, 200, 130, 135, 140, 210,
150, 225, 160, 165, 170, 180, -1, -1,
};
static const int vid_to_voltage[32] = {
2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
1075, 1050, 1024, 1000, 975, 950, 925, 0,
};
struct psb_header {
char signature[10];
u_char version;
u_char flags;
u_short settlingtime;
u_char res1;
u_char numpst;
} __packed;
struct pst_header {
u_int32_t cpuid;
u_char fsb;
u_char maxfid;
u_char startvid;
u_char numpstates;
} __packed;
static u_int fsb;
static u_int sgtc;
static int
decode_pst(char *p, int npstates)
{
int i;
int freq, fid, vid;
for (i = 0; i < npstates; ++i) {
fid = *p++;
vid = *p++;
freq = 100 * fid_to_mult[fid] * fsb;
printf(" %2d %8dkHz FID %02x (%2d.%01d) VID %02x (%4dmV)\n",
i,
freq,
fid, fid_to_mult[fid]/10, fid_to_mult[fid]%10,
vid, vid_to_voltage[vid]);
}
return 0;
}
static
void decode_psb(char *p, int numpst)
{
int i;
struct psb_header *psb;
struct pst_header *pst;
psb = (struct psb_header*) p;
if (psb->version != 0x12)
return;
printf("PSB version: %hhx flags: %hhx settling time %hhuus res1 %hhx num pst %hhu\n",
psb->version,
psb->flags,
psb->settlingtime,
psb->res1,
psb->numpst);
sgtc = psb->settlingtime * 100;
if (sgtc < 10000)
sgtc = 10000;
p = ((char *) psb) + sizeof(struct psb_header);
if (numpst < 0)
numpst = psb->numpst;
else
printf("Overriding number of pst :%d\n", numpst);
for (i = 0; i < numpst; i++) {
pst = (struct pst_header*) p;
if (relevant != 0) {
if (relevant!= pst->cpuid)
goto next_one;
}
printf(" PST %d cpuid %.3x fsb %hhu mfid %hhx svid %hhx numberstates %hhu\n",
i+1,
pst->cpuid,
pst->fsb,
pst->maxfid,
pst->startvid,
pst->numpstates);
fsb = pst->fsb;
decode_pst(p + sizeof(struct pst_header), pst->numpstates);
next_one:
p += sizeof(struct pst_header) + 2*pst->numpstates;
}
}
static struct option info_opts[] = {
{"numpst", no_argument, NULL, 'n'},
};
void print_help(void)
{
printf ("Usage: dump_psb [options]\n");
printf ("Options:\n");
printf (" -n, --numpst Set number of PST tables to scan\n");
printf (" -r, --relevant Only display PSTs relevant to cpuid N\n");
}
int
main(int argc, char *argv[])
{
int fd;
int numpst=-1;
int ret=0, cont=1;
char *mem = NULL;
char *p;
do {
ret = getopt_long(argc, argv, "hr:n:", info_opts, NULL);
switch (ret){
case '?':
case 'h':
print_help();
cont = 0;
break;
case 'r':
relevant = strtol(optarg, NULL, 16);
break;
case 'n':
numpst = strtol(optarg, NULL, 10);
break;
case -1:
cont = 0;
break;
}
} while(cont);
fd = open("/dev/mem", O_RDONLY);
if (fd < 0) {
printf ("Couldn't open /dev/mem. Are you root?\n");
exit(1);
}
mem = mmap(mem, 0x100000 - 0xc0000, PROT_READ, MAP_SHARED, fd, 0xc0000);
close(fd);
for (p = mem; p - mem < LEN; p+=16) {
if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
decode_psb(p, numpst);
break;
}
}
munmap(mem, LEN);
return 0;
}
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