cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

noaudio.c (3906B)

      1/*
      2 * QEMU Timer based audio emulation
      3 *
      4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "qemu/host-utils.h"
     27#include "qemu/module.h"
     28#include "audio.h"
     29#include "qemu/timer.h"
     30
     31#define AUDIO_CAP "noaudio"
     32#include "audio_int.h"
     33
     34typedef struct NoVoiceOut {
     35    HWVoiceOut hw;
     36    RateCtl rate;
     37} NoVoiceOut;
     38
     39typedef struct NoVoiceIn {
     40    HWVoiceIn hw;
     41    RateCtl rate;
     42} NoVoiceIn;
     43
     44static size_t no_write(HWVoiceOut *hw, void *buf, size_t len)
     45{
     46    NoVoiceOut *no = (NoVoiceOut *) hw;
     47    return audio_rate_get_bytes(&hw->info, &no->rate, len);
     48}
     49
     50static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
     51{
     52    NoVoiceOut *no = (NoVoiceOut *) hw;
     53
     54    audio_pcm_init_info (&hw->info, as);
     55    hw->samples = 1024;
     56    audio_rate_start(&no->rate);
     57    return 0;
     58}
     59
     60static void no_fini_out (HWVoiceOut *hw)
     61{
     62    (void) hw;
     63}
     64
     65static void no_enable_out(HWVoiceOut *hw, bool enable)
     66{
     67    NoVoiceOut *no = (NoVoiceOut *) hw;
     68
     69    if (enable) {
     70        audio_rate_start(&no->rate);
     71    }
     72}
     73
     74static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
     75{
     76    NoVoiceIn *no = (NoVoiceIn *) hw;
     77
     78    audio_pcm_init_info (&hw->info, as);
     79    hw->samples = 1024;
     80    audio_rate_start(&no->rate);
     81    return 0;
     82}
     83
     84static void no_fini_in (HWVoiceIn *hw)
     85{
     86    (void) hw;
     87}
     88
     89static size_t no_read(HWVoiceIn *hw, void *buf, size_t size)
     90{
     91    NoVoiceIn *no = (NoVoiceIn *) hw;
     92    int64_t bytes = audio_rate_get_bytes(&hw->info, &no->rate, size);
     93
     94    audio_pcm_info_clear_buf(&hw->info, buf, bytes / hw->info.bytes_per_frame);
     95    return bytes;
     96}
     97
     98static void no_enable_in(HWVoiceIn *hw, bool enable)
     99{
    100    NoVoiceIn *no = (NoVoiceIn *) hw;
    101
    102    if (enable) {
    103        audio_rate_start(&no->rate);
    104    }
    105}
    106
    107static void *no_audio_init(Audiodev *dev)
    108{
    109    return &no_audio_init;
    110}
    111
    112static void no_audio_fini (void *opaque)
    113{
    114    (void) opaque;
    115}
    116
    117static struct audio_pcm_ops no_pcm_ops = {
    118    .init_out = no_init_out,
    119    .fini_out = no_fini_out,
    120    .write    = no_write,
    121    .run_buffer_out = audio_generic_run_buffer_out,
    122    .enable_out = no_enable_out,
    123
    124    .init_in  = no_init_in,
    125    .fini_in  = no_fini_in,
    126    .read     = no_read,
    127    .run_buffer_in = audio_generic_run_buffer_in,
    128    .enable_in = no_enable_in
    129};
    130
    131static struct audio_driver no_audio_driver = {
    132    .name           = "none",
    133    .descr          = "Timer based audio emulation",
    134    .init           = no_audio_init,
    135    .fini           = no_audio_fini,
    136    .pcm_ops        = &no_pcm_ops,
    137    .can_be_default = 1,
    138    .max_voices_out = INT_MAX,
    139    .max_voices_in  = INT_MAX,
    140    .voice_size_out = sizeof (NoVoiceOut),
    141    .voice_size_in  = sizeof (NoVoiceIn)
    142};
    143
    144static void register_audio_none(void)
    145{
    146    audio_driver_register(&no_audio_driver);
    147}
    148type_init(register_audio_none);