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/*
* ========================================================
*
* HCore
* Copyright Mahrouss Logic, all rights reserved.
*
* ========================================================
*/
#include <NewKit/PageManager.hpp>
#include <NewKit/UserHeap.hpp>
/// @file Heap.cxx
/// @brief Heap Manager, user mode allocator.
/// @note if you want to look at kernel allocs, please look for KHeap.cxx
/// bugs: 0
namespace HCore {
class HeapManager final {
public:
static SizeT& GetCount() { return s_NumPools; }
static Ref<Pmm>& GetPmm() { return s_Pmm; }
static Boolean& IsEnabled() { return s_PoolsAreEnabled; }
static Array<Ref<PTEWrapper*>, kPoolMaxSz>& The() { return s_Pool; }
private:
static Size s_NumPools;
static Ref<Pmm> s_Pmm;
private:
static Boolean s_PoolsAreEnabled;
static Array<Ref<PTEWrapper*>, kPoolMaxSz> s_Pool;
};
//! declare fields
SizeT HeapManager::s_NumPools = 0UL;
Ref<Pmm> HeapManager::s_Pmm;
Boolean HeapManager::s_PoolsAreEnabled = true;
Array<Ref<PTEWrapper*>, kPoolMaxSz> HeapManager::s_Pool;
static voidPtr ke_find_unused_heap(Int flags);
static void ke_free_heap_internal(voidPtr vaddr);
static voidPtr ke_make_heap(voidPtr vaddr, Int flags);
static bool ke_check_and_free_heap(const SizeT& index, voidPtr ptr);
static voidPtr ke_find_unused_heap(Int flags) {
for (SizeT index = 0; index < kPoolMaxSz; ++index) {
if (HeapManager::The()[index] &&
!HeapManager::The()[index].Leak().Leak().Leak()->Present()) {
HeapManager::GetPmm().Leak().TogglePresent(
HeapManager::The()[index].Leak().Leak(), true);
kcout << "[ke_find_unused_heap] Done, trying now to make a pool\r\n";
return ke_make_heap((voidPtr)HeapManager::The()[index]
.Leak()
.Leak()
.Leak()
->VirtualAddress(),
flags);
}
}
return nullptr;
}
static voidPtr ke_make_heap(voidPtr virtualAddress, Int flags) {
if (virtualAddress) {
HeapHeader* pool_hdr = reinterpret_cast<HeapHeader*>(virtualAddress);
if (!pool_hdr->Free) {
kcout << "[ke_make_heap] pool_hdr->Free, Pool already exists\n";
return nullptr;
}
pool_hdr->Flags = flags;
pool_hdr->Magic = kPoolMag;
pool_hdr->Free = false;
kcout << "[ke_make_heap] New allocation has been done.\n";
return reinterpret_cast<voidPtr>(
(reinterpret_cast<UIntPtr>(virtualAddress) + sizeof(HeapHeader)));
}
kcout << "[ke_make_heap] Address is invalid";
return nullptr;
}
static void ke_free_heap_internal(voidPtr virtualAddress) {
HeapHeader* pool_hdr = reinterpret_cast<HeapHeader*>(
reinterpret_cast<UIntPtr>(virtualAddress) - sizeof(HeapHeader));
if (pool_hdr->Magic == kPoolMag) {
pool_hdr->Free = false;
pool_hdr->Flags = 0;
kcout << "[ke_free_heap_internal] Successfully marked header as free!\r\n";
}
}
static bool ke_check_and_free_heap(const SizeT& index, voidPtr ptr) {
if (HeapManager::The()[index]) {
// ErrorOr<>::operator bool
if (!HeapManager::The()[index].Leak().Leak().IsStrong()) {
// we want them to be weak
// because we allocated it.
if (HeapManager::The()[index].Leak().Leak().Leak()->VirtualAddress() ==
(UIntPtr)ptr) {
HeapManager::GetPmm().Leak().FreePage(
HeapManager::The()[index].Leak().Leak());
--HeapManager::GetCount();
ke_free_heap_internal(ptr);
ptr = nullptr;
return true;
}
}
}
return false;
}
/// @brief Creates a new pool pointer.
/// @param flags the flags attached to it.
/// @return a pool pointer with selected permissions.
voidPtr ke_new_heap(Int32 flags) {
if (!HeapManager::IsEnabled()) return nullptr;
if (HeapManager::GetCount() > kPoolMaxSz) return nullptr;
if (voidPtr ret = ke_find_unused_heap(flags)) return ret;
// this wasn't set to true
auto ref_page = HeapManager::GetPmm().Leak().RequestPage(
((flags & kPoolUser)), (flags & kPoolRw));
if (ref_page) {
///! reserve page.
HeapManager::The()[HeapManager::GetCount()].Leak() = ref_page;
auto& ref = HeapManager::GetCount();
++ref; // increment the number of addresses we have now.
kcout << "[ke_new_heap] New Address found!\r\n";
// finally make the pool address.
return ke_make_heap(
reinterpret_cast<voidPtr>(ref_page.Leak()->VirtualAddress()), flags);
}
return nullptr;
}
/// @brief free a pool pointer.
/// @param ptr The pool pointer to free.
/// @return status code
Int32 ke_free_heap(voidPtr ptr) {
if (!HeapManager::IsEnabled()) return -1;
if (ptr) {
SizeT base = HeapManager::GetCount();
if (ke_check_and_free_heap(base, ptr)) return 0;
for (SizeT index = 0; index < kPoolMaxSz; ++index) {
if (ke_check_and_free_heap(index, ptr)) return 0;
--base;
}
}
return -1;
}
/// @brief Init HeapManager, set GetCount to zero and IsEnabled to true.
/// @return
Void ke_init_heap() {
HeapManager::GetCount() = 0UL;
HeapManager::IsEnabled() = true;
}
} // namespace HCore
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