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/* ========================================
Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
======================================== */
#include <KernelKit/DebugOutput.h>
#include <NeKit/PageMgr.h>
#ifdef __NE_AMD64__
#include <HALKit/AMD64/Paging.h>
#elif defined(__NE_ARM64__)
#include <HALKit/ARM64/Paging.h>
#endif // ifdef __NE_AMD64__ || defined(__NE_ARM64__)
namespace Kernel {
PTEWrapper::PTEWrapper(Boolean Rw, Boolean User, Boolean ExecDisable, UIntPtr VirtAddr)
: fRw(Rw),
fUser(User),
fExecDisable(ExecDisable),
fVirtAddr(VirtAddr),
fCache(false),
fShareable(false),
fWt(false),
fPresent(true),
fAccessed(false) {}
PTEWrapper::~PTEWrapper() = default;
/// @brief Flush virtual address.
/// @param VirtAddr
Void PageMgr::FlushTLB() {
#ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
hal_flush_tlb();
#endif // !__NE_VIRTUAL_MEMORY_SUPPORT__
}
/// @brief Reclaim freed page.
/// @return
Bool PTEWrapper::Reclaim() {
if (!this->fPresent) {
this->fPresent = true;
return true;
}
return false;
}
/// @brief Request a PTE.
/// @param Rw Is it read write? or is it read only?
/// @param User user mode?
/// @param ExecDisable disable execution on page?
/// @return
PTEWrapper PageMgr::Request(Boolean Rw, Boolean User, Boolean ExecDisable, SizeT Sz, SizeT Pad) {
// Store PTE wrapper right after PTE.
VoidPtr ptr = Kernel::HAL::mm_alloc_bitmap(Rw, User, Sz, NO, Pad);
return PTEWrapper{Rw, User, ExecDisable, reinterpret_cast<UIntPtr>(ptr)};
}
/// @brief Disable BitMap.
/// @param wrapper the wrapper.
/// @return If the page bitmap was cleared or not.
Bool PageMgr::Free(Ref<PTEWrapper>& wrapper) {
if (!Kernel::HAL::mm_free_bitmap((VoidPtr) wrapper.Leak().VirtualAddress())) return false;
return true;
}
/// @brief Virtual PTE address.
/// @return The virtual address of the page.
UIntPtr PTEWrapper::VirtualAddress() {
return (fVirtAddr);
}
Bool PTEWrapper::Shareable() {
return fShareable;
}
Bool PTEWrapper::Present() {
return fPresent;
}
Bool PTEWrapper::Access() {
return fAccessed;
}
Void PTEWrapper::NoExecute(const bool enable) {
fExecDisable = enable;
}
Bool PTEWrapper::NoExecute() {
return fExecDisable;
}
} // namespace Kernel
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