LadybirdBrowser/ladybird
1
1
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-12-28 05:35:52 +03:00
Code Issues Packages Projects Releases Wiki Activity

Kernel: Use a WaitQueue in the SoundBlaster 16 driver

Browse Source 
Instead of waking up to check for IRQ's regularly, use a WaitQueue and
wake it up in the IRQ handler.
This commit is contained in:
Andreas Kling 2019-12-01 12:53:19 +01:00
parent 8b129476b1
commit 7126a42d4d
Notes: sideshowbarker 2024-07-19 11:00:34 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/7126a42d4d2
2 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Kernel/Devices/SB16.cpp
View File

@ -65,6 +65,8 @@ SB16& SB16::the()
void SB16::initialize()
{
disable_irq();
IO::out8(0x226, 1);
IO::delay();
IO::out8(0x226, 0);
@ -81,7 +83,6 @@ void SB16::initialize()
auto vmin = dsp_read();
kprintf("SB16: found version %d.%d\n", m_major_version, vmin);
enable_irq();
}
bool SB16::can_read(const FileDescription&) const
@ -134,16 +135,15 @@ void SB16::handle_irq()
if (m_major_version >= 4)
IO::in8(DSP_R_ACK); // 16 bit interrupt
m_interrupted = true;
m_irq_queue.wake_all();
}
void SB16::wait_for_irq()
{
// Well, we have no way of knowing how much got written. So just hope all of
// it did, even if we're interrupted.
(void)current->block_until("Interrupting", [this] {
return m_interrupted;
});
cli();
enable_irq();
current->wait_on(m_irq_queue);
disable_irq();
}
ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
@ -162,7 +162,6 @@ ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
u8 mode = (u8)SampleFormat::Signed | (u8)SampleFormat::Stereo;
disable_irq();
const int sample_rate = 44100;
set_sample_rate(sample_rate);
memcpy(m_dma_buffer_page->paddr().as_ptr(), data, length);
@ -183,8 +182,6 @@ ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
dsp_write((u8)sample_count);
dsp_write((u8)(sample_count >> 8));
m_interrupted = false;
enable_irq();
wait_for_irq();
return length;
}

4
Kernel/Devices/SB16.h
View File

@ -5,6 +5,7 @@
#include <Kernel/IRQHandler.h>
#include <Kernel/VM/PhysicalAddress.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/WaitQueue.h>
class SB16;
@ -37,6 +38,7 @@ private:
u8 dsp_read();
RefPtr<PhysicalPage> m_dma_buffer_page;
bool m_interrupted { false };
int m_major_version { 0 };
WaitQueue m_irq_queue;
};