1 /* 2 * Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de. 3 * Copyright 2005-2009, Axel Dörfler, axeld@pinc-software.de. 4 * Distributed under the terms of the MIT License. 5 * 6 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved. 7 * Distributed under the terms of the NewOS License. 8 */ 9 #ifndef KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H 10 #define KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H 11 12 13 #include <SupportDefs.h> 14 15 #include <heap.h> 16 17 #include <smp.h> 18 19 20 struct X86PagingStructures : DeferredDeletable { 21 phys_addr_t pgdir_phys; 22 int32 ref_count; 23 CPUSet active_on_cpus; 24 // mask indicating on which CPUs the map is currently used 25 26 X86PagingStructures(); 27 virtual ~X86PagingStructures(); 28 29 inline void AddReference(); 30 inline void RemoveReference(); 31 32 virtual void Delete() = 0; 33 }; 34 35 36 inline void 37 X86PagingStructures::AddReference() 38 { 39 atomic_add(&ref_count, 1); 40 } 41 42 43 inline void 44 X86PagingStructures::RemoveReference() 45 { 46 if (atomic_add(&ref_count, -1) == 1) 47 Delete(); 48 } 49 50 51 #endif // KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H 52