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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pcsp.h (2276B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * PC-Speaker driver for Linux
      4 *
      5 * Copyright (C) 1993-1997  Michael Beck
      6 * Copyright (C) 1997-2001  David Woodhouse
      7 * Copyright (C) 2001-2008  Stas Sergeev
      8 */
      9
     10#ifndef __PCSP_H__
     11#define __PCSP_H__
     12
     13#include <linux/hrtimer.h>
     14#include <linux/i8253.h>
     15#include <linux/timex.h>
     16
     17#define PCSP_SOUND_VERSION 0x400	/* read 4.00 */
     18#define PCSP_DEBUG 0
     19
     20/* default timer freq for PC-Speaker: 18643 Hz */
     21#define DIV_18KHZ 64
     22#define MAX_DIV DIV_18KHZ
     23#define CALC_DIV(d) (MAX_DIV >> (d))
     24#define CUR_DIV() CALC_DIV(chip->treble)
     25#define PCSP_MAX_TREBLE 1
     26
     27/* unfortunately, with hrtimers 37KHz does not work very well :( */
     28#define PCSP_DEFAULT_TREBLE 0
     29#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
     30
     31/* wild guess */
     32#define PCSP_MIN_LPJ 1000000
     33#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
     34#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
     35#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
     36#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
     37#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
     38#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
     39#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
     40#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
     41#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
     42#define PCSP_CALC_NS(div) ({ \
     43	u64 __val = 1000000000ULL * (div); \
     44	do_div(__val, PIT_TICK_RATE); \
     45	__val; \
     46})
     47#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
     48
     49#define PCSP_MAX_PERIOD_SIZE	(64*1024)
     50#define PCSP_MAX_PERIODS	512
     51#define PCSP_BUFFER_SIZE	(128*1024)
     52
     53struct snd_pcsp {
     54	struct snd_card *card;
     55	struct snd_pcm *pcm;
     56	struct input_dev *input_dev;
     57	struct hrtimer timer;
     58	unsigned short port, irq, dma;
     59	spinlock_t substream_lock;
     60	struct snd_pcm_substream *playback_substream;
     61	unsigned int fmt_size;
     62	unsigned int is_signed;
     63	size_t playback_ptr;
     64	size_t period_ptr;
     65	atomic_t timer_active;
     66	int thalf;
     67	u64 ns_rem;
     68	unsigned char val61;
     69	int enable;
     70	int max_treble;
     71	int treble;
     72	int pcspkr;
     73};
     74
     75extern struct snd_pcsp pcsp_chip;
     76
     77extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
     78extern void pcsp_sync_stop(struct snd_pcsp *chip);
     79
     80extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
     81extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
     82
     83#endif