haiku/headers/private/kernel/vm/VMArea.h
Ingo Weinhold 2c1886aeae * Added VMArea subclasses VM{Kernel,User}Area and moved the address space list
link to them.
* VM{Kernel,User}AddressSpace manage the respective VMArea subclass now, and
  VMAddressSpace has grown factory methods {Create,Delete}Area.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34493 a95241bf-73f2-0310-859d-f6bbb57e9c96
2009-12-04 17:07:16 +00:00

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2.8 KiB
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/*
* Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
* Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
* Distributed under the terms of the NewOS License.
*/
#ifndef _KERNEL_VM_VM_AREA_H
#define _KERNEL_VM_VM_AREA_H
#include <lock.h>
#include <util/DoublyLinkedList.h>
#include <util/OpenHashTable.h>
#include <vm/vm_types.h>
struct VMAddressSpace;
struct VMCache;
struct VMKernelAddressSpace;
struct VMUserAddressSpace;
struct VMArea {
char* name;
area_id id;
uint32 protection;
uint16 wiring;
uint16 memory_type;
VMCache* cache;
vint32 no_cache_change;
off_t cache_offset;
uint32 cache_type;
VMAreaMappings mappings;
uint8* page_protections;
struct VMAddressSpace* address_space;
struct VMArea* cache_next;
struct VMArea* cache_prev;
struct VMArea* hash_next;
addr_t Base() const { return fBase; }
size_t Size() const { return fSize; }
bool ContainsAddress(addr_t address) const
{ return address >= fBase
&& address <= fBase + (fSize - 1); }
protected:
VMArea(VMAddressSpace* addressSpace,
uint32 wiring, uint32 protection);
~VMArea();
status_t Init(const char* name);
protected:
friend class VMAddressSpace;
friend class VMKernelAddressSpace;
friend class VMUserAddressSpace;
protected:
void SetBase(addr_t base) { fBase = base; }
void SetSize(size_t size) { fSize = size; }
protected:
addr_t fBase;
size_t fSize;
};
struct VMAreaHashDefinition {
typedef area_id KeyType;
typedef VMArea ValueType;
size_t HashKey(area_id key) const
{
return key;
}
size_t Hash(const VMArea* value) const
{
return HashKey(value->id);
}
bool Compare(area_id key, const VMArea* value) const
{
return value->id == key;
}
VMArea*& GetLink(VMArea* value) const
{
return value->hash_next;
}
};
typedef BOpenHashTable<VMAreaHashDefinition> VMAreaHashTable;
struct VMAreaHash {
static status_t Init();
static status_t ReadLock()
{ return rw_lock_read_lock(&sLock); }
static void ReadUnlock()
{ rw_lock_read_unlock(&sLock); }
static status_t WriteLock()
{ return rw_lock_write_lock(&sLock); }
static void WriteUnlock()
{ rw_lock_write_unlock(&sLock); }
static VMArea* LookupLocked(area_id id)
{ return sTable.Lookup(id); }
static VMArea* Lookup(area_id id);
static area_id Find(const char* name);
static void Insert(VMArea* area);
static void Remove(VMArea* area);
static VMAreaHashTable::Iterator GetIterator()
{ return sTable.GetIterator(); }
private:
static rw_lock sLock;
static VMAreaHashTable sTable;
};
#endif // _KERNEL_VM_VM_AREA_H