cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gpio-chip-info.c (1191B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * GPIO character device helper for reading chip information.
      4 *
      5 * Copyright (C) 2021 Bartosz Golaszewski <brgl@bgdev.pl>
      6 */
      7
      8#include <fcntl.h>
      9#include <linux/gpio.h>
     10#include <stdio.h>
     11#include <stdlib.h>
     12#include <string.h>
     13#include <sys/ioctl.h>
     14#include <sys/types.h>
     15
     16static void print_usage(void)
     17{
     18	printf("usage:\n");
     19	printf("  gpio-chip-info <chip path> [name|label|num-lines]\n");
     20}
     21
     22int main(int argc, char **argv)
     23{
     24	struct gpiochip_info info;
     25	int fd, ret;
     26
     27	if (argc != 3) {
     28		print_usage();
     29		return EXIT_FAILURE;
     30	}
     31
     32	fd = open(argv[1], O_RDWR);
     33	if (fd < 0) {
     34		perror("unable to open the GPIO chip");
     35		return EXIT_FAILURE;
     36	}
     37
     38	memset(&info, 0, sizeof(info));
     39	ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &info);
     40	if (ret) {
     41		perror("chip info ioctl failed");
     42		return EXIT_FAILURE;
     43	}
     44
     45	if (strcmp(argv[2], "name") == 0) {
     46		printf("%s\n", info.name);
     47	} else if (strcmp(argv[2], "label") == 0) {
     48		printf("%s\n", info.label);
     49	} else if (strcmp(argv[2], "num-lines") == 0) {
     50		printf("%u\n", info.lines);
     51	} else {
     52		fprintf(stderr, "unknown command: %s\n", argv[2]);
     53		return EXIT_FAILURE;
     54	}
     55
     56	return EXIT_SUCCESS;
     57}