physmemworks.asm

来自「用汇编语言编写Windows驱动程序的工具」· 汇编 代码 · 共 123 行

;@echo off
;goto make

.386
.model flat, stdcall
option casemap:none

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;                                  I N C L U D E   F I L E S                                        
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include \masm32\include\w2k\ntddk.inc
include \masm32\include\w2k\ntstatus.inc

include \masm32\include\kernel32.inc
include \masm32\include\w2k\ntdll.inc

includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\w2k\ntdll.lib

include \masm32\Macros\Strings.mac

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include protos.inc

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;                                     C O N S T A N T S                                             
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.const
CCOUNTED_UNICODE_STRING	"\\Device\\PhysicalMemory", g_usPhysicalMemory, 4

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;                                       C O D E                                                     
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.code

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;                                    NtStatusToDosError                                             
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NtStatusToDosError proc status:NTSTATUS

	invoke RtlNtStatusToDosError, status
	ret

NtStatusToDosError endp

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;                                    OpenPhysicalMemory                                             
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OpenPhysicalMemory proc

local status:NTSTATUS
local hPhysMem:HANDLE
local oa:OBJECT_ATTRIBUTES

	and hPhysMem, NULL

	lea ecx, oa
	InitializeObjectAttributes ecx, offset g_usPhysicalMemory, OBJ_CASE_INSENSITIVE, NULL, NULL

	invoke NtOpenSection, addr hPhysMem, SECTION_MAP_READ, ecx

	mov eax, hPhysMem
	ret

OpenPhysicalMemory endp

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;                                       MapPhysicalMemory                                           
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MapPhysicalMemory proc hPhysMem:HANDLE, pdwAddress:PDWORD, pdwLength:PDWORD, pdwBaseAddress:PDWORD

local status:NTSTATUS
local SectionOffset:PHYSICAL_ADDRESS

	mov eax, pdwBaseAddress
	and dword ptr [eax], 0

	and SectionOffset.HighPart, 0
	mov eax, pdwAddress
	push dword ptr [eax]
	pop SectionOffset.LowPart

	mov ecx, pdwLength
	mov ecx, [ecx]
	invoke NtMapViewOfSection, hPhysMem, -1, pdwBaseAddress, 0, ecx, addr SectionOffset, pdwLength, ViewShare, 0, PAGE_READONLY

	.if eax == STATUS_SUCCESS
		mov ecx, pdwAddress
		push SectionOffset.LowPart
		pop dword ptr [ecx]
	.endif

	ret

MapPhysicalMemory endp

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;                                     UnmapPhysicalMemory                                           
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UnmapPhysicalMemory proc dwBaseAddress:DWORD

	invoke NtUnmapViewOfSection, -1, dwBaseAddress

	ret

UnmapPhysicalMemory endp

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;                                                                                                   
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end