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/*
* ========================================================
*
* HCore
* Copyright Mahrouss Logic, all rights reserved.
*
* ========================================================
*/
#include <HALKit/AMD64/HalPageAlloc.hpp>
#include <NewKit/Defines.hpp>
#include <NewKit/RuntimeCheck.hpp>
// this files handles paging.
static HCore::UIntPtr kPagePtr = kPagePtrAddress;
static HCore::SizeT kPageCnt = 0UL;
namespace HCore {
namespace HAL {
static auto hal_try_alloc_new_page(SizeT sz, Boolean rw, Boolean user)
-> PageTable64 * {
char *ptr = &(reinterpret_cast<char *>(kPagePtr))[kPageCnt + 1];
PageTable64 *pte = reinterpret_cast<PageTable64 *>(ptr);
pte->Rw = rw;
pte->User = user;
pte->Present = true;
return pte;
}
auto hal_alloc_page(SizeT sz, Boolean rw, Boolean user) -> PageTable64 * {
for (SizeT i = 0; i < kPageCnt; ++i) {
PageTable64 *pte = (reinterpret_cast<PageTable64 *>(&kPagePtr) + i);
if (!pte->Present) {
pte->User = user;
pte->Rw = rw;
pte->Present = true;
return pte;
}
}
return hal_try_alloc_new_page(sz, rw, user);
}
auto hal_create_page(Boolean rw, Boolean user) -> UIntPtr {
PageTable64 *new_pte = hal_alloc_page(sizeof(PageTable64), rw, user);
MUST_PASS(new_pte);
return reinterpret_cast<UIntPtr>(new_pte);
}
} // namespace HAL
} // namespace HCore
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