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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proc.c (2136B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * RTC subsystem, proc interface
      4 *
      5 * Copyright (C) 2005-06 Tower Technologies
      6 * Author: Alessandro Zummo <a.zummo@towertech.it>
      7 *
      8 * based on arch/arm/common/rtctime.c
      9 */
     10
     11#include <linux/module.h>
     12#include <linux/rtc.h>
     13#include <linux/proc_fs.h>
     14#include <linux/seq_file.h>
     15
     16#include "rtc-core.h"
     17
     18#define NAME_SIZE	10
     19
     20#if defined(CONFIG_RTC_HCTOSYS_DEVICE)
     21static bool is_rtc_hctosys(struct rtc_device *rtc)
     22{
     23	int size;
     24	char name[NAME_SIZE];
     25
     26	size = snprintf(name, NAME_SIZE, "rtc%d", rtc->id);
     27	if (size >= NAME_SIZE)
     28		return false;
     29
     30	return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
     31}
     32#else
     33static bool is_rtc_hctosys(struct rtc_device *rtc)
     34{
     35	return (rtc->id == 0);
     36}
     37#endif
     38
     39static int rtc_proc_show(struct seq_file *seq, void *offset)
     40{
     41	int err;
     42	struct rtc_device *rtc = seq->private;
     43	const struct rtc_class_ops *ops = rtc->ops;
     44	struct rtc_wkalrm alrm;
     45	struct rtc_time tm;
     46
     47	err = rtc_read_time(rtc, &tm);
     48	if (err == 0) {
     49		seq_printf(seq,
     50			   "rtc_time\t: %ptRt\n"
     51			   "rtc_date\t: %ptRd\n",
     52			   &tm, &tm);
     53	}
     54
     55	err = rtc_read_alarm(rtc, &alrm);
     56	if (err == 0) {
     57		seq_printf(seq, "alrm_time\t: %ptRt\n", &alrm.time);
     58		seq_printf(seq, "alrm_date\t: %ptRd\n", &alrm.time);
     59		seq_printf(seq, "alarm_IRQ\t: %s\n",
     60			   alrm.enabled ? "yes" : "no");
     61		seq_printf(seq, "alrm_pending\t: %s\n",
     62			   alrm.pending ? "yes" : "no");
     63		seq_printf(seq, "update IRQ enabled\t: %s\n",
     64			   (rtc->uie_rtctimer.enabled) ? "yes" : "no");
     65		seq_printf(seq, "periodic IRQ enabled\t: %s\n",
     66			   (rtc->pie_enabled) ? "yes" : "no");
     67		seq_printf(seq, "periodic IRQ frequency\t: %d\n",
     68			   rtc->irq_freq);
     69		seq_printf(seq, "max user IRQ frequency\t: %d\n",
     70			   rtc->max_user_freq);
     71	}
     72
     73	seq_printf(seq, "24hr\t\t: yes\n");
     74
     75	if (ops->proc)
     76		ops->proc(rtc->dev.parent, seq);
     77
     78	return 0;
     79}
     80
     81void rtc_proc_add_device(struct rtc_device *rtc)
     82{
     83	if (is_rtc_hctosys(rtc))
     84		proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show,
     85					rtc);
     86}
     87
     88void rtc_proc_del_device(struct rtc_device *rtc)
     89{
     90	if (is_rtc_hctosys(rtc))
     91		remove_proc_entry("driver/rtc", NULL);
     92}