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/*
* Copyright 2016 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*/
#include "driver.h"
#include "compat.h"
static MapIoSpaceFunc DetectMapIoSpace;
MapIoSpaceFunc *MapIoSpace = DetectMapIoSpace;
typedef NTKERNELAPI PVOID MmMapIoSpaceExFunc(
_In_ PHYSICAL_ADDRESS PhysicalAddress,
_In_ SIZE_T NumberOfBytes,
_In_ ULONG Protect
);
static MmMapIoSpaceExFunc *pMmMapIoSpaceEx;
// all functions in this module are paged
#pragma code_seg("PAGE")
// we call MmMapIoSpace only if MmMapIoSpaceEx is not present
// so disable the warning
#pragma warning(push)
#pragma warning(disable:30029)
static PVOID OldMapIoSpace(
_In_ PHYSICAL_ADDRESS PhysicalAddress,
_In_ SIZE_T NumberOfBytes,
_In_ MEMORY_CACHING_TYPE CacheType,
_In_ ULONG Protect
)
{
PAGED_CODE();
return MmMapIoSpace(PhysicalAddress, NumberOfBytes, CacheType);
}
#pragma warning(pop)
static PVOID NewMapIoSpace(
_In_ PHYSICAL_ADDRESS PhysicalAddress,
_In_ SIZE_T NumberOfBytes,
_In_ MEMORY_CACHING_TYPE CacheType,
_In_ ULONG Protect
)
{
PAGED_CODE();
return pMmMapIoSpaceEx(PhysicalAddress, NumberOfBytes, Protect);
}
static PVOID DetectMapIoSpace(
_In_ PHYSICAL_ADDRESS PhysicalAddress,
_In_ SIZE_T NumberOfBytes,
_In_ MEMORY_CACHING_TYPE CacheType,
_In_ ULONG Protect
)
{
PAGED_CODE();
UNICODE_STRING name;
RtlInitUnicodeString(&name, L"MmMapIoSpaceEx");
pMmMapIoSpaceEx = (MmMapIoSpaceExFunc*)MmGetSystemRoutineAddress(&name);
if (pMmMapIoSpaceEx) {
MapIoSpace = NewMapIoSpace;
} else {
MapIoSpace = OldMapIoSpace;
}
return MapIoSpace(PhysicalAddress, NumberOfBytes, CacheType, Protect);
}
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