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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mmtimer.h (2117B)

      1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
      2/*
      3 * Intel Multimedia Timer device interface
      4 *
      5 * This file is subject to the terms and conditions of the GNU General Public
      6 * License.  See the file "COPYING" in the main directory of this archive
      7 * for more details.
      8 *
      9 * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All rights reserved.
     10 *
     11 * This file should define an interface compatible with the IA-PC Multimedia
     12 * Timers Draft Specification (rev. 0.97) from Intel.  Note that some
     13 * hardware may not be able to safely export its registers to userspace,
     14 * so the ioctl interface should support all necessary functionality.
     15 *
     16 * 11/01/01 - jbarnes - initial revision
     17 * 9/10/04 - Christoph Lameter - remove interrupt support
     18 * 9/17/04 - jbarnes - remove test program, move some #defines to the driver
     19 */
     20
     21#ifndef _LINUX_MMTIMER_H
     22#define _LINUX_MMTIMER_H
     23
     24/*
     25 * Breakdown of the ioctl's available.  An 'optional' next to the command
     26 * indicates that supporting this command is optional, while 'required'
     27 * commands must be implemented if conformance is desired.
     28 *
     29 * MMTIMER_GETOFFSET - optional
     30 *   Should return the offset (relative to the start of the page where the
     31 *   registers are mapped) for the counter in question.
     32 *
     33 * MMTIMER_GETRES - required
     34 *   The resolution of the clock in femto (10^-15) seconds
     35 *
     36 * MMTIMER_GETFREQ - required
     37 *   Frequency of the clock in Hz
     38 *
     39 * MMTIMER_GETBITS - required
     40 *   Number of bits in the clock's counter
     41 *
     42 * MMTIMER_MMAPAVAIL - required
     43 *   Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
     44 *
     45 * MMTIMER_GETCOUNTER - required
     46 *   Gets the current value in the counter
     47 */
     48#define MMTIMER_IOCTL_BASE 'm'
     49
     50#define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
     51#define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
     52#define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
     53#define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
     54#define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
     55#define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)
     56
     57#endif /* _LINUX_MMTIMER_H */