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/* -------------------------------------------
Copyright SoftwareLabs
------------------------------------------- */
#include <KernelKit/DebugOutput.hpp>
#include <NewKit/PageManager.hpp>
#ifdef __x86_64__
#include <HALKit/AMD64/HalPageAlloc.hpp>
#endif // ifdef __x86_64__
//! null deref will throw (Page Zero detected, aborting app!)
#define kProtectedRegionEnd (512)
namespace NewOS
{
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()
{
}
/// @brief Flush virtual address.
/// @param VirtAddr
void PageManager::FlushTLB(UIntPtr VirtAddr)
{
if (VirtAddr == kBadAddress)
return;
hal_flush_tlb();
}
/// @brief Reclaim freed page.
/// @return
bool PTEWrapper::Reclaim()
{
if (!this->fPresent)
{
this->fPresent = true;
return true;
}
return false;
}
/// @brief Request a PTE.
/// @param Rw r/w?
/// @param User user mode?
/// @param ExecDisable disable execution on page?
/// @return
PTEWrapper PageManager::Request(Boolean Rw, Boolean User, Boolean ExecDisable, SizeT Sz)
{
// Store PTE wrapper right after PTE.
VoidPtr ptr = NewOS::HAL::hal_alloc_page(Rw, User, Sz);
return PTEWrapper{Rw, User, ExecDisable, reinterpret_cast<UIntPtr>(ptr)};
}
/// @brief Disable PTE.
/// @param wrapper the wrapper.
/// @return
bool PageManager::Free(Ref<PTEWrapper*>& wrapper)
{
if (wrapper)
{
if (!Detail::page_disable(wrapper->VirtualAddress()))
return false;
return true;
}
return false;
}
/// @brief Virtual PTE address.
/// @return The virtual address of the page.
const 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)
{
this->fExecDisable = enable;
}
const bool& PTEWrapper::NoExecute()
{
return this->fExecDisable;
}
} // namespace NewOS
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