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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
#ifndef SWAPKIT_DISKSWAP_H
#define SWAPKIT_DISKSWAP_H
#include <CompilerKit/CompilerKit.h>
#include <NeKit/Config.h>
#include <hint/CompilerHint.h>
#define kSwapPageFilePath "/boot/pagefile.sys"
#define kSwapPageFilePathU8 u8"/boot/pagefile.sys"
/// @file SwapDisk.h
/// @brief Virtual memory swap disk.
namespace Kernel {
struct SwapDiskHdr;
class IDiskSwap;
/// @brief Virtual memory interface to swap memory chunks onto disk.
/// @note The class only supports the NeFS as of right now, as it is using forks to write data into
/// disk.
class IDiskSwap final {
public:
IDiskSwap() = default;
~IDiskSwap() = default;
NE_COPY_DEFAULT(IDiskSwap)
public:
/***********************************************************************************/
/// @brief Write memory chunk onto disk.
/// @param data the data packet.
/// @return Number of bytes written to swap.
/***********************************************************************************/
_Output Int64 Write(SwapDiskHdr* data);
/***********************************************************************************/
/// @brief Read memory chunk from disk.
/// @param data the data packet length.
/// @return Whether the swap was fetched to disk, or not.
/***********************************************************************************/
_Output SwapDiskHdr* Read(const UIntPtr offset, SizeT data_len);
};
/// @brief Swap disk header, containing information about the held virtual memory.
/// @param fMagic Ident number.
/// @param fHeaderSz This header size.
/// @param fTeamID Process Team ID.
/// @param fProcessID Process ID.
/// @param fVirtualAddress Virtual address pointed by data.
/// @param fBlobSz Blob's size.
/// @param fBlob Data blob.
typedef struct SwapDiskHdr {
UInt32 fMagic;
SizeT fHeaderSz;
UInt64 fTeamID;
UInt64 fProcessID;
UIntPtr fOffset;
UInt64 fVirtualAddress;
SizeT fBlobSz;
UInt8 fBlob[1];
} PACKED ALIGN(8) SwapDiskHdr;
} // namespace Kernel
#endif
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