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// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
// Licensed under the Apache License, Version 2.0 (see LICENSE file)
// Official repository: https://github.com/nekernel-org/nekernel
#include <ArchKit/ArchKit.h>
#include <KernelKit/PCI/Iterator.h>
#include <modules/ATA/ATA.h>
#if defined(__ATA_DMA__)
#define kATADataLen (256)
using namespace Kernel;
using namespace Kernel::HAL;
/// BUGS: 0
STATIC Boolean kATADetected = false;
STATIC Int32 kATADeviceType ATTRIBUTE(unused) = kATADeviceCount;
STATIC UInt16 kATAIdentifyData[kATADataLen] = {0};
STATIC Kernel::PCI::Device kATADevice;
STATIC Char kATADiskModel[50] ATTRIBUTE(unused) = {"GENERIC DMA"};
Boolean drv_std_wait_io(UInt16 IO) {
for (int i = 0; i < 400; i++) rt_in8(IO + ATA_REG_STATUS);
ATAWaitForIO_Retry:
auto status_rdy = rt_in8(IO + ATA_REG_STATUS);
if ((status_rdy & ATA_SR_BSY)) goto ATAWaitForIO_Retry;
ATAWaitForIO_Retry2:
status_rdy = rt_in8(IO + ATA_REG_STATUS);
if (status_rdy & ATA_SR_ERR) return false;
if (!(status_rdy & ATA_SR_DRDY)) goto ATAWaitForIO_Retry2;
return true;
}
Void drv_std_select(UInt16 Bus) {
if (Bus == ATA_PRIMARY_IO)
rt_out8(Bus + ATA_REG_HDDEVSEL, ATA_PRIMARY_SEL);
else
rt_out8(Bus + ATA_REG_HDDEVSEL, ATA_SECONDARY_SEL);
}
Boolean drv_std_init(UInt16 Bus, UInt8 Drive, UInt16& OutBus, UInt8& OutMaster) {
NE_UNUSED(Bus);
NE_UNUSED(Drive);
NE_UNUSED(OutBus);
NE_UNUSED(OutMaster);
PCI::Iterator iterator(Types::PciDeviceKind::MassStorageController);
for (SizeT device_index = 0; device_index < NE_BUS_COUNT; ++device_index) {
kATADevice = iterator[device_index].Leak(); // And then leak the reference.
/// IDE interface
if (kATADevice.Subclass() == 0x01) {
break;
}
}
return NO;
}
namespace Kernel::Detail {
struct PRDEntry final {
UInt32 mAddress;
UInt16 mByteCount;
UInt16 mFlags; /// @param PRD flags, set to 0x8000 to indicate end of prd.
};
} // namespace Kernel::Detail
static UIntPtr kReadAddr = mib_cast(2);
static UIntPtr kWriteAddr = mib_cast(2) + kib_cast(64);
Void drv_std_read(UInt64 Lba, UInt16 IO, UInt8 Master, Char* Buf, SizeT SectorSz, SizeT Size) {
Lba /= SectorSz;
if (Size > kib_cast(64)) return;
UInt8 Command = ((!Master) ? 0xE0 : 0xF0);
rt_copy_memory((VoidPtr) Buf, (VoidPtr) kReadAddr, Size);
drv_std_select(IO);
rt_out8(IO + ATA_REG_HDDEVSEL, (Command) | (((Lba) >> 24) & 0x0F));
rt_out8(IO + ATA_REG_SEC_COUNT0, ((Size + SectorSz - 1) / SectorSz));
rt_out8(IO + ATA_REG_LBA0, (Lba) & 0xFF);
rt_out8(IO + ATA_REG_LBA1, (Lba) >> 8);
rt_out8(IO + ATA_REG_LBA2, (Lba) >> 16);
rt_out8(IO + ATA_REG_LBA3, (Lba) >> 24);
Kernel::Detail::PRDEntry* prd =
(Kernel::Detail::PRDEntry*) (kATADevice.Bar(0x20) + 4); // The PRDEntry is not correct.
prd->mAddress = (UInt32) (UIntPtr) kReadAddr;
prd->mByteCount = Size - 1;
prd->mFlags = 0x8000; // indicate the end of prd.
rt_out32(kATADevice.Bar(0x20) + 0x04, (UInt32) (UIntPtr) prd);
rt_out8(kATADevice.Bar(0x20) + ATA_REG_COMMAND, ATA_CMD_READ_DMA);
rt_out8(kATADevice.Bar(0x20) + 0x00, 0x09); // Start DMA engine
while (rt_in8(kATADevice.Bar(0x20) + ATA_REG_STATUS) & 0x01);
rt_out8(kATADevice.Bar(0x20) + 0x00, 0x00); // Stop DMA engine
rt_copy_memory((VoidPtr) kReadAddr, (VoidPtr) Buf, Size);
delete prd;
prd = nullptr;
}
Void drv_std_write(UInt64 Lba, UInt16 IO, UInt8 Master, Char* Buf, SizeT SectorSz, SizeT Size) {
Lba /= SectorSz;
if (Size > kib_cast(64)) return;
UInt8 Command = ((!Master) ? 0xE0 : 0xF0);
rt_copy_memory((VoidPtr) Buf, (VoidPtr) kWriteAddr, Size);
rt_out8(IO + ATA_REG_HDDEVSEL, (Command) | (((Lba) >> 24) & 0x0F));
rt_out8(IO + ATA_REG_SEC_COUNT0, ((Size + (SectorSz - 1)) / SectorSz));
rt_out8(IO + ATA_REG_LBA0, (Lba) & 0xFF);
rt_out8(IO + ATA_REG_LBA1, (Lba) >> 8);
rt_out8(IO + ATA_REG_LBA2, (Lba) >> 16);
rt_out8(IO + ATA_REG_LBA3, (Lba) >> 24);
Kernel::Detail::PRDEntry* prd = (Kernel::Detail::PRDEntry*) (kATADevice.Bar(0x20) + 4);
prd->mAddress = (UInt32) (UIntPtr) kWriteAddr;
prd->mByteCount = Size - 1;
prd->mFlags = 0x8000;
rt_out32(kATADevice.Bar(0x20) + 0x04, (UInt32) (UIntPtr) prd);
rt_out8(kATADevice.Bar(0x20) + ATA_REG_COMMAND, ATA_CMD_WRITE_DMA);
rt_out8(IO + 0x00, 0x09); // Start DMA engine
while (rt_in8(kATADevice.Bar(0x20) + ATA_REG_STATUS) & 0x01);
rt_out8(kATADevice.Bar(0x20) + 0x00, 0x00); // Stop DMA engine
delete prd;
prd = nullptr;
}
/***********************************************************************************/
/// @brief Is ATA detected?
/***********************************************************************************/
Boolean drv_std_detected(Void) {
return kATADetected;
}
/***********************************************************************************/
/***
@brief Gets the number of sectors inside the drive.
@return Number of sectors, or zero.
*/
/***********************************************************************************/
Kernel::SizeT drv_std_get_sector_count() {
return (kATAIdentifyData[61] << 16) | kATAIdentifyData[60];
}
/***********************************************************************************/
/// @brief Get the size of the current drive.
/***********************************************************************************/
Kernel::SizeT drv_std_get_size() {
return (drv_std_get_sector_count()) * kATASectorSize;
}
#endif /* ifdef __ATA_DMA__ */
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