haiku/headers/private/kernel/vm/VMArea.h
Ingo Weinhold 3b0c1b5227 * VMArea: Made memory_type private and added setter and getter methods.
* Don't set the VMArea's memory type in arch_vm_set_memory_type(), but let the
  callers do that.
* vm_set_area_memory_type(): Does nothing, if the memory type doesn't change.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36573 a95241bf-73f2-0310-859d-f6bbb57e9c96
2010-05-01 20:41:57 +00:00

230 lines
5.1 KiB
C++

/*
* Copyright 2009-2010, 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 <vm_defs.h>
#include <lock.h>
#include <util/DoublyLinkedList.h>
#include <util/SinglyLinkedList.h>
#include <util/OpenHashTable.h>
#include <vm/vm_types.h>
struct VMAddressSpace;
struct VMCache;
struct VMKernelAddressSpace;
struct VMUserAddressSpace;
struct VMAreaUnwiredWaiter
: public DoublyLinkedListLinkImpl<VMAreaUnwiredWaiter> {
VMArea* area;
addr_t base;
size_t size;
ConditionVariable condition;
ConditionVariableEntry waitEntry;
};
typedef DoublyLinkedList<VMAreaUnwiredWaiter> VMAreaUnwiredWaiterList;
struct VMAreaWiredRange : SinglyLinkedListLinkImpl<VMAreaWiredRange> {
VMArea* area;
addr_t base;
size_t size;
bool writable;
bool implicit; // range created automatically
VMAreaUnwiredWaiterList waiters;
VMAreaWiredRange()
{
}
VMAreaWiredRange(addr_t base, size_t size, bool writable, bool implicit)
:
area(NULL),
base(base),
size(size),
writable(writable),
implicit(implicit)
{
}
void SetTo(addr_t base, size_t size, bool writable, bool implicit)
{
this->area = NULL;
this->base = base;
this->size = size;
this->writable = writable;
this->implicit = implicit;
}
bool IntersectsWith(addr_t base, size_t size) const
{
return this->base + this->size - 1 >= base
&& base + size - 1 >= this->base;
}
};
typedef SinglyLinkedList<VMAreaWiredRange> VMAreaWiredRangeList;
struct VMPageWiringInfo {
VMAreaWiredRange range;
addr_t physicalAddress;
// the actual physical address corresponding to
// the virtual address passed to vm_wire_page()
// (i.e. with in-page offset)
vm_page* page;
};
struct VMArea {
char* name;
area_id id;
uint32 protection;
uint16 wiring;
private:
uint16 memory_type; // >> shifted by MEMORY_TYPE_SHIFT
public:
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; }
inline uint32 MemoryType() const;
inline void SetMemoryType(uint32 memoryType);
bool ContainsAddress(addr_t address) const
{ return address >= fBase
&& address <= fBase + (fSize - 1); }
bool IsWired() const
{ return !fWiredRanges.IsEmpty(); }
bool IsWired(addr_t base, size_t size) const;
void Wire(VMAreaWiredRange* range);
void Unwire(VMAreaWiredRange* range);
VMAreaWiredRange* Unwire(addr_t base, size_t size, bool writable);
bool AddWaiterIfWired(VMAreaUnwiredWaiter* waiter);
bool AddWaiterIfWired(VMAreaUnwiredWaiter* waiter,
addr_t base, size_t size,
VMAreaWiredRange* ignoreRange = NULL);
protected:
VMArea(VMAddressSpace* addressSpace,
uint32 wiring, uint32 protection);
~VMArea();
status_t Init(const char* name, uint32 allocationFlags);
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;
VMAreaWiredRangeList fWiredRanges;
};
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;
};
uint32
VMArea::MemoryType() const
{
return (uint32)memory_type << MEMORY_TYPE_SHIFT;
}
void
VMArea::SetMemoryType(uint32 memoryType)
{
memory_type = memoryType >> MEMORY_TYPE_SHIFT;
}
#endif // _KERNEL_VM_VM_AREA_H