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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
------------------------------------------- */
#include <ArchKit/ArchKit.h>
#ifdef __NE_AMD64__
#include <HALKit/AMD64/Paging.h>
#elif defined(__NE_ARM64__)
#include <HALKit/ARM64/Paging.h>
#endif
#include <NewKit/Defines.h>
#include <NewKit/KernelPanic.h>
#define kBitMapMagic (0x10210U)
#define kBitMapPadSize (mib_cast(16))
#define kBitMapMagIdx (0U)
#define kBitMapSizeIdx (1U)
#define kBitMapUsedIdx (2U)
namespace NeOS
{
namespace HAL
{
namespace Detail
{
/// \brief Proxy Interface to allocate a bitmap.
class IBitMapProxy final
{
public:
explicit IBitMapProxy() = default;
~IBitMapProxy() = default;
NE_COPY_DELETE(IBitMapProxy);
auto IsBitMap(VoidPtr page_ptr) -> Bool
{
if (!page_ptr)
return No;
UIntPtr* ptr_bit_set = reinterpret_cast<UIntPtr*>(page_ptr);
if (!ptr_bit_set[kBitMapMagIdx] ||
ptr_bit_set[kBitMapMagIdx] != kBitMapMagic)
return No;
return Yes;
}
auto FreeBitMap(VoidPtr page_ptr) -> Bool
{
if (this->IsBitMap(page_ptr) == No)
return No;
UIntPtr* ptr_bit_set = reinterpret_cast<UIntPtr*>(page_ptr);
ptr_bit_set[kBitMapMagIdx] = kBitMapMagic;
ptr_bit_set[kBitMapUsedIdx] = No;
this->GetBitMapStatus(ptr_bit_set);
return Yes;
}
UInt32 MakeMMFlags(Bool wr, Bool user)
{
UInt32 flags = kMMFlagsPresent;
if (wr)
flags |= kMMFlagsWr;
if (user)
flags |= kMMFlagsUser;
return flags;
}
/// @brief Iterate over availables pages for a free one.
/// @return The new address which was found.
auto FindBitMap(VoidPtr base_ptr, SizeT size, Bool wr, Bool user) -> VoidPtr
{
if (!size)
return nullptr;
VoidPtr base = reinterpret_cast<VoidPtr>(((UIntPtr)base_ptr) + kPageSize);
static SizeT biggest_block = 0UL;
while (YES)
{
UIntPtr* ptr_bit_set = reinterpret_cast<UIntPtr*>(base);
if (ptr_bit_set[kBitMapMagIdx] == kBitMapMagic &&
ptr_bit_set[kBitMapSizeIdx] == size)
{
if (ptr_bit_set[kBitMapUsedIdx] == No)
{
ptr_bit_set[kBitMapSizeIdx] = size;
ptr_bit_set[kBitMapUsedIdx] = Yes;
this->GetBitMapStatus(ptr_bit_set);
UInt32 flags = this->MakeMMFlags(wr, user);
mm_map_page(ptr_bit_set, ptr_bit_set, flags);
if (biggest_block < size)
biggest_block = size;
return (VoidPtr)ptr_bit_set;
}
}
else if (ptr_bit_set[kBitMapMagIdx] != kBitMapMagic)
{
ptr_bit_set[kBitMapMagIdx] = kBitMapMagic;
ptr_bit_set[kBitMapSizeIdx] = size;
ptr_bit_set[kBitMapUsedIdx] = Yes;
this->GetBitMapStatus(ptr_bit_set);
UInt32 flags = this->MakeMMFlags(wr, user);
mm_map_page(ptr_bit_set, ptr_bit_set, flags);
if (biggest_block < size)
biggest_block = size;
return (VoidPtr)ptr_bit_set;
}
base = reinterpret_cast<VoidPtr>(reinterpret_cast<UIntPtr>(base) + ((ptr_bit_set[kBitMapMagIdx] != kBitMapMagic) ? (size) : ptr_bit_set[kBitMapSizeIdx]));
}
return nullptr;
}
/// @brief Print Bitmap status
auto GetBitMapStatus(UIntPtr* ptr_bit_set) -> Void
{
if (!this->IsBitMap(ptr_bit_set))
{
kout << "Not a BitMap: " << hex_number((UIntPtr)ptr_bit_set) << endl;
return;
}
kout << "Magic Number: " << hex_number(ptr_bit_set[kBitMapMagIdx]) << endl;
kout << "Is Allocated: " << (ptr_bit_set[kBitMapUsedIdx] ? "Yes" : "No") << endl;
kout << "Size of BitMap (B): " << number(ptr_bit_set[kBitMapSizeIdx]) << endl;
kout << "Size of BitMap (KIB): " << number(KIB(ptr_bit_set[kBitMapSizeIdx])) << endl;
kout << "Size of BitMap (MIB): " << number(MIB(ptr_bit_set[kBitMapSizeIdx])) << endl;
kout << "Size of BitMap (GIB): " << number(GIB(ptr_bit_set[kBitMapSizeIdx])) << endl;
kout << "Size of BitMap (TIB): " << number(TIB(ptr_bit_set[kBitMapSizeIdx])) << endl;
kout << "Address Of BitMap Header: " << hex_number((UIntPtr)ptr_bit_set) << endl;
}
};
} // namespace Detail
auto mm_is_bitmap(VoidPtr ptr) -> Bool
{
Detail::IBitMapProxy bitmp;
return bitmp.IsBitMap(ptr);
}
/// @brief Allocate a new page to be used by the OS.
/// @param wr read/write bit.
/// @param user user bit.
/// @return a new bitmap allocated pointer.
auto mm_alloc_bitmap(Boolean wr, Boolean user, SizeT size, Bool is_page) -> VoidPtr
{
VoidPtr ptr_new = nullptr;
Detail::IBitMapProxy bitmp;
ptr_new = bitmp.FindBitMap(kKernelBitMpStart, size, wr, user);
MUST_PASS(ptr_new);
return (UIntPtr*)ptr_new;
}
/// @brief Free Bitmap, and mark it as absent.
/// @param ptr the pointer to free.
auto mm_free_bitmap(VoidPtr ptr) -> Bool
{
if (!ptr)
return No;
Detail::IBitMapProxy bitmp;
Bool ret = bitmp.FreeBitMap(ptr);
return ret;
}
} // namespace HAL
} // namespace NeOS
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