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IDEDiskDevice: Add sysctl variable for turning DMA on/off.

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This commit is contained in:
Andreas Kling 2019-05-19 15:54:33 +02:00
parent 29863d3815
commit 5f26f83451
Notes: sideshowbarker 2024-07-19 14:01:07 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/5f26f83451e
2 changed files with 6 additions and 2 deletions
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7
Kernel/Devices/IDEDiskDevice.cpp
View file

@ -7,6 +7,7 @@
#include "PIC.h"
#include <Kernel/Lock.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/FileSystem/ProcFS.h>
//#define DISK_DEBUG
@ -110,6 +111,8 @@ Retained<IDEDiskDevice> IDEDiskDevice::create()
IDEDiskDevice::IDEDiskDevice()
: IRQHandler(IRQ_FIXED_DISK)
{
m_dma_enabled.resource() = true;
ProcFS::the().add_sys_bool("ide_dma", m_dma_enabled);
initialize();
}
@ -129,14 +132,14 @@ unsigned IDEDiskDevice::block_size() const
bool IDEDiskDevice::read_blocks(unsigned index, word count, byte* out)
{
if (m_bus_master_base)
if (m_bus_master_base && m_dma_enabled.resource())
return read_sectors_with_dma(index, count, out);
return read_sectors(index, count, out);
}
bool IDEDiskDevice::read_block(unsigned index, byte* out) const
{
if (m_bus_master_base)
if (m_bus_master_base && const_cast<IDEDiskDevice*>(this)->m_dma_enabled.resource())
return const_cast<IDEDiskDevice&>(*this).read_sectors_with_dma(index, 1, out);
return const_cast<IDEDiskDevice&>(*this).read_sectors(index, 1, out);
}

1
Kernel/Devices/IDEDiskDevice.h
View file

@ -53,5 +53,6 @@ private:
PhysicalRegionDescriptor m_prdt;
RetainPtr<PhysicalPage> m_dma_buffer_page;
word m_bus_master_base { 0 };
Lockable<bool> m_dma_enabled;
};