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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Oxide Computer Company
*/
/*
* Read and write to the AMD SMN.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <usmn.h>
static boolean_t
usmn_read(int fd, const char *addr)
{
unsigned long long l;
char *eptr;
usmn_reg_t usr;
errno = 0;
l = strtoull(addr, &eptr, 16);
if (errno != 0 || *eptr != '\0' || l > UINT32_MAX) {
warnx("failed to parse %s: invalid string or address", addr);
return (B_FALSE);
}
usr.usr_addr = (uint32_t)l;
usr.usr_data = 0;
if (ioctl(fd, USMN_READ, &usr) != 0) {
warn("failed to read SMN at 0x%x", usr.usr_addr);
return (B_FALSE);
}
(void) printf("0x%x: 0x%x\n", usr.usr_addr, usr.usr_data);
return (B_TRUE);
}
int
main(int argc, char *argv[])
{
int i, c, fd, ret;
const char *device = NULL;
while ((c = getopt(argc, argv, "d:")) != -1) {
switch (c) {
case 'd':
device = optarg;
break;
default:
(void) fprintf(stderr, "Usage: usmn -d device addr "
"[addr]...\n"
"Note: All addresses are interpreted as hex\n");
return (2);
}
}
if (device == NULL) {
errx(EXIT_FAILURE, "missing required device");
}
argc -= optind;
argv += optind;
if (argc == 0) {
errx(EXIT_FAILURE, "missing registers to read");
}
if ((fd = open(device, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "failed to open %s", device);
}
ret = EXIT_SUCCESS;
for (i = 0; i < argc; i++) {
if (!usmn_read(fd, argv[i])) {
ret = EXIT_FAILURE;
}
}
(void) close(fd);
return (ret);
}
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