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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pps_kernel.h (2966B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * PPS API kernel header
      4 *
      5 * Copyright (C) 2009   Rodolfo Giometti <giometti@linux.it>
      6 */
      7
      8#ifndef LINUX_PPS_KERNEL_H
      9#define LINUX_PPS_KERNEL_H
     10
     11#include <linux/pps.h>
     12#include <linux/cdev.h>
     13#include <linux/device.h>
     14#include <linux/time.h>
     15
     16/*
     17 * Global defines
     18 */
     19
     20struct pps_device;
     21
     22/* The specific PPS source info */
     23struct pps_source_info {
     24	char name[PPS_MAX_NAME_LEN];		/* symbolic name */
     25	char path[PPS_MAX_NAME_LEN];		/* path of connected device */
     26	int mode;				/* PPS allowed mode */
     27
     28	void (*echo)(struct pps_device *pps,
     29			int event, void *data);	/* PPS echo function */
     30
     31	struct module *owner;
     32	struct device *dev;		/* Parent device for device_create */
     33};
     34
     35struct pps_event_time {
     36#ifdef CONFIG_NTP_PPS
     37	struct timespec64 ts_raw;
     38#endif /* CONFIG_NTP_PPS */
     39	struct timespec64 ts_real;
     40};
     41
     42/* The main struct */
     43struct pps_device {
     44	struct pps_source_info info;		/* PSS source info */
     45
     46	struct pps_kparams params;		/* PPS current params */
     47
     48	__u32 assert_sequence;			/* PPS assert event seq # */
     49	__u32 clear_sequence;			/* PPS clear event seq # */
     50	struct pps_ktime assert_tu;
     51	struct pps_ktime clear_tu;
     52	int current_mode;			/* PPS mode at event time */
     53
     54	unsigned int last_ev;			/* last PPS event id */
     55	wait_queue_head_t queue;		/* PPS event queue */
     56
     57	unsigned int id;			/* PPS source unique ID */
     58	void const *lookup_cookie;		/* For pps_lookup_dev() only */
     59	struct cdev cdev;
     60	struct device *dev;
     61	struct fasync_struct *async_queue;	/* fasync method */
     62	spinlock_t lock;
     63};
     64
     65/*
     66 * Global variables
     67 */
     68
     69extern const struct attribute_group *pps_groups[];
     70
     71/*
     72 * Internal functions.
     73 *
     74 * These are not actually part of the exported API, but this is a
     75 * convenient header file to put them in.
     76 */
     77
     78extern int pps_register_cdev(struct pps_device *pps);
     79extern void pps_unregister_cdev(struct pps_device *pps);
     80
     81/*
     82 * Exported functions
     83 */
     84
     85extern struct pps_device *pps_register_source(
     86		struct pps_source_info *info, int default_params);
     87extern void pps_unregister_source(struct pps_device *pps);
     88extern void pps_event(struct pps_device *pps,
     89		struct pps_event_time *ts, int event, void *data);
     90/* Look up a pps_device by magic cookie */
     91struct pps_device *pps_lookup_dev(void const *cookie);
     92
     93static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
     94		struct timespec64 ts)
     95{
     96	kt->sec = ts.tv_sec;
     97	kt->nsec = ts.tv_nsec;
     98}
     99
    100static inline void pps_get_ts(struct pps_event_time *ts)
    101{
    102	struct system_time_snapshot snap;
    103
    104	ktime_get_snapshot(&snap);
    105	ts->ts_real = ktime_to_timespec64(snap.real);
    106#ifdef CONFIG_NTP_PPS
    107	ts->ts_raw = ktime_to_timespec64(snap.raw);
    108#endif
    109}
    110
    111/* Subtract known time delay from PPS event time(s) */
    112static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
    113{
    114	ts->ts_real = timespec64_sub(ts->ts_real, delta);
    115#ifdef CONFIG_NTP_PPS
    116	ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
    117#endif
    118}
    119
    120#endif /* LINUX_PPS_KERNEL_H */