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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
File: HalPagingMgr.cc
Purpose: Platform Paging Manager.
------------------------------------------- */
#include <HALKit/ARM64/Paging.h>
#include <HALKit/ARM64/Processor.h>
namespace Kernel::HAL {
typedef UInt32 PageTableIndex;
/// \brief Page store type.
struct NE_PAGE_STORE final {
struct {
PDE* fPde{nullptr};
PTE* fPte{nullptr};
VoidPtr fVAddr{nullptr};
} fInternalStore;
Bool fStoreOp{No}; // Store operation in progress.
static NE_PAGE_STORE& The() {
static NE_PAGE_STORE the;
return the;
}
};
/// \brief Retrieve the page status of a PTE.
STATIC Void mmi_page_status(PTE* pte) {
NE_UNUSED(pte);
}
STATIC Int32 mmi_map_page_table_entry(VoidPtr virtual_address, UInt32 flags, PTE* pt_entry);
/// @brief Maps or allocates a page from virtual_address.
/// @param virtual_address a valid virtual address.
/// @param phys_addr point to physical address.
/// @param flags the flags to put on the page.
/// @return Status code of page manipulation process.
EXTERN_C Int32 mm_map_page(VoidPtr virtual_address, VoidPtr physical_address, UInt32 flags) {
if (!virtual_address || !flags) return kErrorSuccess;
NE_PAGE_STORE& page_store = NE_PAGE_STORE::The();
while (page_store.fStoreOp);
page_store.fStoreOp = Yes;
if (page_store.fInternalStore.fVAddr == virtual_address) {
page_store.fStoreOp = No;
return mmi_map_page_table_entry(page_store.fInternalStore.fVAddr, flags,
page_store.fInternalStore.fPte);
}
return kErrorSuccess;
}
/// @brief Maps flags for a specific pte.
/// @internal Internal function.
STATIC Int32 mmi_map_page_table_entry(VoidPtr virtual_address, UInt32 flags, PTE* pt_entry) {
NE_PAGE_STORE& page_store = NE_PAGE_STORE::The();
// Update internal store, and tlbi the virtual address.
page_store.fInternalStore.fPde = nullptr;
page_store.fInternalStore.fPte = pt_entry;
page_store.fInternalStore.fVAddr = virtual_address;
page_store.fStoreOp = No;
return kErrorSuccess;
}
} // namespace Kernel::HAL
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