Leaked source code of windows server 2003
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
title "pae";++;; Copyright (c) 1989, 2000 Microsoft Corporation;; Module Name:;; pae.asm;; Abstract:;; This module implements the code necessary to swap PTEs on a PAE system.;; Author:;; Landy Wang (landyw) 15-Nov-1998;; Environment:;; Kernel mode only.;; Revision History:;;--
.586p .xlistinclude callconv.incFPOFRAME macro a, b.FPO ( a, b, 0, 0, 0, 0 )endm .list
_TEXT$00 SEGMENT PARA PUBLIC 'CODE' ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
page , 132 subttl "Interlocked Swap PTE"
;++;; VOID; InterlockedExchangePte (; IN OUT PMMPTE Destination,; IN ULONGLONG Exchange; );; Routine Description:;; This function performs an interlocked swap of a PTE. This is only needed; for the PAE architecture where the PTE width is larger than the register; width.;; Both PTEs must be valid or a careful write would have been done instead.;; Arguments:;; PtePointer - Address of PTE to update with new value.;; NewPteContents - The new value to put in the PTE.;; Return Value:;; None.;;--
cPublicProc _InterlockedExchangePte ,3
push ebx push esi
mov ebx, [esp] + 16 ; ebx = NewPteContents lowpart mov ecx, [esp] + 20 ; ebx = NewPteContents highpart
mov esi, [esp] + 12 ; esi = PtePointer
mov edx, [esi] + 4 mov eax, [esi] ; edx:eax = target pte contents
swapagain:
; ; cmpxchg loads edx:eax with the new contents of the target quadword ; in the event of failure ;
lock cmpxchg8b qword ptr [esi] ; compare and exchange
jnz short swapagain ; if z clear, exchange failed
pop esi pop ebx
stdRET _InterlockedExchangePtestdENDP _InterlockedExchangePte
_TEXT$00 ends
end
|
