85 lines
2 KiB
C++
85 lines
2 KiB
C++
|
//+-------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Microsoft Windows
|
||
|
|
// Copyright (C) Microsoft Corporation, 1992 - 1992.
|
||
|
|
//
|
||
|
|
// File: PAGEMAN.HXX
|
||
|
|
//
|
||
|
|
// Contents: Page manager.
|
||
|
|
//
|
||
|
|
// History: 06-Aug-92 KyleP Added copyright
|
||
|
|
// 06-Aug-92 KyleP Kernel implementation
|
||
|
|
//
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#define PAGE_SIZE 4096
|
||
|
|
|
||
|
|
//+-------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Class: CPageManager
|
||
|
|
//
|
||
|
|
// Purpose: Manage pages
|
||
|
|
//
|
||
|
|
// History: 25-Dec-92 BartoszM Created
|
||
|
|
//
|
||
|
|
// Notes: Merry Christmas!
|
||
|
|
//
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
class CPageManager
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static void* GetPage( unsigned ccPage = 1 );
|
||
|
|
static void FreePage ( void* page );
|
||
|
|
};
|
||
|
|
|
||
|
|
//+-------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Member: CPageManager::GetPage, public
|
||
|
|
//
|
||
|
|
// Synopsis: Gets a page.
|
||
|
|
//
|
||
|
|
// History: 25-Dec-91 KyleP Created
|
||
|
|
// 02-Aug-93 KyleP Just use heap to allocate memory.
|
||
|
|
//
|
||
|
|
// Notes: The kernel heap is smart enough to allocate large chunks
|
||
|
|
// of memory directly from the memory manager.
|
||
|
|
//
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
inline void* CPageManager::GetPage( unsigned ccPage /* = 1 */ )
|
||
|
|
{
|
||
|
|
void * p = VirtualAlloc ( 0, ccPage * PAGE_SIZE, MEM_COMMIT, PAGE_READWRITE );
|
||
|
|
|
||
|
|
if ( 0 == p )
|
||
|
|
{
|
||
|
|
THROW( CException( STATUS_INSUFFICIENT_RESOURCES ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
return(p);
|
||
|
|
}
|
||
|
|
|
||
|
|
//+-------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Member: CPageManager::FreePage, public
|
||
|
|
//
|
||
|
|
// Synopsis: Frees a page.
|
||
|
|
//
|
||
|
|
// History: 25-Dec-91 KyleP Created
|
||
|
|
//
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
inline void CPageManager::FreePage ( void* page )
|
||
|
|
{
|
||
|
|
if (page == 0)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
VirtualFree ( page, 0, MEM_RELEASE );
|
||
|
|
}
|
||
|
|
|
||
|
|
|