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.h (4734B)

      1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
      2/*
      3 * PPS API header
      4 *
      5 * Copyright (C) 2005-2009   Rodolfo Giometti <giometti@linux.it>
      6 *
      7 *   This program is free software; you can redistribute it and/or modify
      8 *   it under the terms of the GNU General Public License as published by
      9 *   the Free Software Foundation; either version 2 of the License, or
     10 *   (at your option) any later version.
     11 *
     12 *   This program is distributed in the hope that it will be useful,
     13 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 *   GNU General Public License for more details.
     16 *
     17 *   You should have received a copy of the GNU General Public License
     18 *   along with this program; if not, write to the Free Software
     19 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     20 */
     21
     22
     23#ifndef _PPS_H_
     24#define _PPS_H_
     25
     26#include <linux/types.h>
     27
     28#define PPS_VERSION		"5.3.6"
     29#define PPS_MAX_SOURCES		16		/* should be enough... */
     30
     31/* Implementation note: the logical states ``assert'' and ``clear''
     32 * are implemented in terms of the chip register, i.e. ``assert''
     33 * means the bit is set.  */
     34
     35/*
     36 * 3.2 New data structures
     37 */
     38
     39#define PPS_API_VERS_1		1
     40#define PPS_API_VERS		PPS_API_VERS_1	/* we use API version 1 */
     41#define PPS_MAX_NAME_LEN	32
     42
     43/* 32-bit vs. 64-bit compatibility.
     44 *
     45 * 0n i386, the alignment of a uint64_t is only 4 bytes, while on most other
     46 * architectures it's 8 bytes. On i386, there will be no padding between the
     47 * two consecutive 'struct pps_ktime' members of struct pps_kinfo and struct
     48 * pps_kparams. But on most platforms there will be padding to ensure correct
     49 * alignment.
     50 *
     51 * The simple fix is probably to add an explicit padding.
     52 *					 		[David Woodhouse]
     53 */
     54struct pps_ktime {
     55	__s64 sec;
     56	__s32 nsec;
     57	__u32 flags;
     58};
     59
     60struct pps_ktime_compat {
     61	__s64 sec;
     62	__s32 nsec;
     63	__u32 flags;
     64} __attribute__((packed, aligned(4)));
     65#define PPS_TIME_INVALID	(1<<0)	/* used to specify timeout==NULL */
     66
     67struct pps_kinfo {
     68	__u32 assert_sequence;		/* seq. num. of assert event */
     69	__u32 clear_sequence; 		/* seq. num. of clear event */
     70	struct pps_ktime assert_tu;	/* time of assert event */
     71	struct pps_ktime clear_tu;	/* time of clear event */
     72	int current_mode;		/* current mode bits */
     73};
     74
     75struct pps_kinfo_compat {
     76	__u32 assert_sequence;			/* seq. num. of assert event */
     77	__u32 clear_sequence;			/* seq. num. of clear event */
     78	struct pps_ktime_compat assert_tu;	/* time of assert event */
     79	struct pps_ktime_compat clear_tu;	/* time of clear event */
     80	int current_mode;			/* current mode bits */
     81};
     82
     83struct pps_kparams {
     84	int api_version;		/* API version # */
     85	int mode;			/* mode bits */
     86	struct pps_ktime assert_off_tu;	/* offset compensation for assert */
     87	struct pps_ktime clear_off_tu;	/* offset compensation for clear */
     88};
     89
     90/*
     91 * 3.3 Mode bit definitions
     92 */
     93
     94/* Device/implementation parameters */
     95#define PPS_CAPTUREASSERT	0x01	/* capture assert events */
     96#define PPS_CAPTURECLEAR	0x02	/* capture clear events */
     97#define PPS_CAPTUREBOTH		0x03	/* capture assert and clear events */
     98
     99#define PPS_OFFSETASSERT	0x10	/* apply compensation for assert event */
    100#define PPS_OFFSETCLEAR		0x20	/* apply compensation for clear event */
    101
    102#define PPS_CANWAIT		0x100	/* can we wait for an event? */
    103#define PPS_CANPOLL		0x200	/* bit reserved for future use */
    104
    105/* Kernel actions */
    106#define PPS_ECHOASSERT		0x40	/* feed back assert event to output */
    107#define PPS_ECHOCLEAR		0x80	/* feed back clear event to output */
    108
    109/* Timestamp formats */
    110#define PPS_TSFMT_TSPEC		0x1000	/* select timespec format */
    111#define PPS_TSFMT_NTPFP		0x2000	/* select NTP format */
    112
    113/*
    114 * 3.4.4 New functions: disciplining the kernel timebase
    115 */
    116
    117/* Kernel consumers */
    118#define PPS_KC_HARDPPS		0	/* hardpps() (or equivalent) */
    119#define PPS_KC_HARDPPS_PLL	1	/* hardpps() constrained to
    120					   use a phase-locked loop */
    121#define PPS_KC_HARDPPS_FLL	2	/* hardpps() constrained to
    122					   use a frequency-locked loop */
    123/*
    124 * Here begins the implementation-specific part!
    125 */
    126
    127struct pps_fdata {
    128	struct pps_kinfo info;
    129	struct pps_ktime timeout;
    130};
    131
    132struct pps_fdata_compat {
    133	struct pps_kinfo_compat info;
    134	struct pps_ktime_compat timeout;
    135};
    136
    137struct pps_bind_args {
    138	int tsformat;	/* format of time stamps */
    139	int edge;	/* selected event type */
    140	int consumer;	/* selected kernel consumer */
    141};
    142
    143#include <linux/ioctl.h>
    144
    145#define PPS_GETPARAMS		_IOR('p', 0xa1, struct pps_kparams *)
    146#define PPS_SETPARAMS		_IOW('p', 0xa2, struct pps_kparams *)
    147#define PPS_GETCAP		_IOR('p', 0xa3, int *)
    148#define PPS_FETCH		_IOWR('p', 0xa4, struct pps_fdata *)
    149#define PPS_KC_BIND		_IOW('p', 0xa5, struct pps_bind_args *)
    150
    151#endif /* _PPS_H_ */