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IDEDiskDevice: Add support for DMA reads.

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I've only tested this with the PIIX3 chipset QEMU emulates, but it works
pretty well here. GCC compile times are cut roughly in half :^)
This commit is contained in:
Andreas Kling 2019-05-19 03:46:50 +02:00
parent 1fd90b09f8
commit c818773983
2 changed files with 186 additions and 1 deletions
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16
Kernel/Devices/IDEDiskDevice.h
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@ -3,9 +3,19 @@
#include <Kernel/Lock.h>
#include <AK/RetainPtr.h>
#include <Kernel/Devices/DiskDevice.h>
#include "IRQHandler.h"
#include <Kernel/IRQHandler.h>
#include <Kernel/PCI.h>
#include <Kernel/PhysicalAddress.h>
#include <Kernel/VM/PhysicalPage.h>
struct PhysicalRegionDescriptor {
PhysicalAddress offset;
word size { 0 };
word end_of_table { 0 };
};
class IDEDiskDevice final : public IRQHandler, public DiskDevice {
AK_MAKE_ETERNAL
public:
static Retained<IDEDiskDevice> create();
virtual ~IDEDiskDevice() override;
@ -27,6 +37,7 @@ private:
void initialize();
bool wait_for_irq();
bool read_sector_with_dma(dword sector, byte*);
bool read_sectors(dword start_sector, word count, byte* buffer);
bool write_sectors(dword start_sector, word count, const byte* data);
@ -37,5 +48,8 @@ private:
volatile bool m_interrupted { false };
volatile byte m_device_error { 0 };
PCI::Address m_pci_address;
PhysicalRegionDescriptor m_prdt;
word m_bus_master_base { 0 };
};