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Date: Mon, 08 Nov 2004 18:00:40 +0100
From: Filip Navara <xnavara@volny.cz>
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Subject: Re: [Qemu-devel] Windows NT page allocation
References: <418F56FF.9060204@bellard.org>
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To: qemu-devel@nongnu.org

Fabrice Bellard wrote:

> Does someone know how to allocate a single 4 KB page of memory in 
> Windows NT ?

In user mode you can allocate one page using
    SYSTEM_INFO SystemInfo;
    GetSystemInfo(&SystemInfo);
    Address = VirtualAlloc(NULL, SystemInfo.dwPageSize, MEM_COMMIT | 
MEM_RESERVE*, *PAGE_EXECUTE_READWRITE);
The problem is that the granuality of VirtualAlloc is 64Kb, so if you 
allocate 4Kb page this way you will end up with the rest 60Kb unusable 
(strictly speaking the memory can be still allocated using different 
mechanisms). It's possible to reserve more memory and then commit 
individual pages from the reserved region though. See 
http://msdn.microsoft.com/library/en-us/memory/base/reserving_and_committing_memory.asp 
for details.

Can you be more specific about the usage you intend? Maybe I would be 
able to suggest you better solution...

Regards,
Filip