1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2020 Oxide Computer Company 14 */ 15 16 /* 17 * Read and write to the AMD SMN. 18 */ 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <unistd.h> 23 #include <err.h> 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 #include <errno.h> 28 #include <usmn.h> 29 30 static boolean_t 31 usmn_read(int fd, const char *addr) 32 { 33 unsigned long long l; 34 char *eptr; 35 usmn_reg_t usr; 36 37 errno = 0; 38 l = strtoull(addr, &eptr, 16); 39 if (errno != 0 || *eptr != '\0' || l > UINT32_MAX) { 40 warnx("failed to parse %s: invalid string or address", addr); 41 return (B_FALSE); 42 } 43 44 usr.usr_addr = (uint32_t)l; 45 usr.usr_data = 0; 46 47 if (ioctl(fd, USMN_READ, &usr) != 0) { 48 warn("failed to read SMN at 0x%x", usr.usr_addr); 49 return (B_FALSE); 50 } 51 52 (void) printf("0x%x: 0x%x\n", usr.usr_addr, usr.usr_data); 53 return (B_TRUE); 54 } 55 56 int 57 main(int argc, char *argv[]) 58 { 59 int i, c, fd, ret; 60 const char *device = NULL; 61 62 while ((c = getopt(argc, argv, "d:")) != -1) { 63 switch (c) { 64 case 'd': 65 device = optarg; 66 break; 67 default: 68 (void) fprintf(stderr, "Usage: usmn -d device addr " 69 "[addr]...\n" 70 "Note: All addresses are interpreted as hex\n"); 71 return (2); 72 } 73 } 74 75 if (device == NULL) { 76 errx(EXIT_FAILURE, "missing required device"); 77 } 78 79 argc -= optind; 80 argv += optind; 81 82 if (argc == 0) { 83 errx(EXIT_FAILURE, "missing registers to read"); 84 } 85 86 if ((fd = open(device, O_RDONLY)) < 0) { 87 err(EXIT_FAILURE, "failed to open %s", device); 88 } 89 90 ret = EXIT_SUCCESS; 91 for (i = 0; i < argc; i++) { 92 if (!usmn_read(fd, argv[i])) { 93 ret = EXIT_FAILURE; 94 } 95 } 96 97 (void) close(fd); 98 99 return (ret); 100 } 101