Function KernelAllocate4KPages

Kernel/src/arch/x86_64/paging.cpp:348–429

	}

	void* KernelAllocate4KPages(uint64_t amount){
		uint64_t offset = 0;
		uint64_t pageDirOffset = 0;
		uint64_t counter = 0;
		uintptr_t address = 0;

		uint64_t pml4Index = KERNEL_HEAP_PML4_INDEX;
		uint64_t pdptIndex = KERNEL_HEAP_PDPT_INDEX;

		/* Attempt 1: Already Allocated Page Tables*/
		for(int i = 0; i < TABLES_PER_DIR; i++){
			if(kernelHeapDir[i] & 0x1 && !(kernelHeapDir[i] & 0x80)){
				for(int j = 0; j < TABLES_PER_DIR; j++){
					if(kernelHeapDirTables[i][j] & 0x1){
						pageDirOffset = i;
						offset = j+1;
						counter = 0;
						continue;
					}

					counter++;

					if(counter >= amount){
						address = (PDPT_SIZE * pml4Index) + (pdptIndex * PAGE_SIZE_1G) + (pageDirOffset * PAGE_SIZE_2M) + (offset*PAGE_SIZE_4K);
						address |= 0xFFFF000000000000;
						while(counter--){
							if(offset >= 512){
								pageDirOffset++;
								offset = 0;
							}
							kernelHeapDirTables[pageDirOffset][offset] = 0x3;
							offset++;
						}

						return (void*)address;
					}
				}
			} else {
				pageDirOffset = i+1;
				offset = 0;
				counter = 0;
			}
		}
		
		pageDirOffset = 0;
		offset = 0;
		counter = 0;

		/* Attempt 2: Allocate Page Tables*/
		for(int i = 0; i < TABLES_PER_DIR; i++){
			if(!(kernelHeapDir[i] & 0x1)){
				counter += 512;

				if(counter >= amount){
					address = (PDPT_SIZE * pml4Index) + (pdptIndex * PAGE_SIZE_1G) + (pageDirOffset * PAGE_SIZE_2M) + (offset*PAGE_SIZE_4K);
					address |= 0xFFFF000000000000;
					//kernelHeapDir[i] = (PAGE_FRAME & ((uintptr_t)&(kernelHeapDirTables[i]) - KERNEL_VIRTUAL_BASE)) | 0x3;
					SetPageFrame(&(kernelHeapDir[pageDirOffset]),((uintptr_t)&(kernelHeapDirTables[pageDirOffset]) - KERNEL_VIRTUAL_BASE));