MmAllocateContiguousMemory&&MmGetPhysicalAddress

最新推荐文章于 2024-04-22 07:10:06 发布

Iqian1314

最新推荐文章于 2024-04-22 07:10:06 发布

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分类专栏： driver_code 文章标签： buffer reference null

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本文介绍了如何使用MmAllocateContiguousMemory和MmGetPhysicalAddress函数来申请全局物理连续内存并获取其物理地址。详细解释了函数参数及返回值，并展示了申请连续内存的具体应用场景。

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/////////////////////// 申请全局物理连续内存，用于D1预览及原始视频/////////////////////

RtlZeroMemory(&g_DriverInfo,sizeof(g_DriverInfo));

PHYSICAL_ADDRESS pa; //物理地址
pa.QuadPart = 0xFFFFFFFFFFFFFFFF; //@最大的可用的物理地址

// g_DriverInfo.vaD1Buffer = MmAllocateContiguousMemory(MAX_DMA_PVBUF,pa);
// if ( g_DriverInfo.vaD1Buffer != NULL )
// {
// g_DriverInfo.paD1Buffer = MmGetPhysicalAddress(g_DriverInfo.vaD1Buffer);
// }

g_DriverInfo.vaOvBuffer = MmAllocateContiguousMemory(MAX_DMA_OVBUF,pa);//@原始视频虚拟地址
if ( g_DriverInfo.vaOvBuffer != NULL )//@虚拟地址分配成功
{
g_DriverInfo.paOvBuffer = MmGetPhysicalAddress(g_DriverInfo.vaOvBuffer);//@返回虚拟地址对应的物理地址
}
///////////////////////20080218-END////////////////////////////////////////////////////////////

用到的函数：

1、MmAllocateContiguousMemory

函数原型：

PVOID
MmAllocateContiguousMemory(
IN ULONG NumberOfBytes,
IN PHYSICAL_ADDRESS HighestAcceptableAddress
);

2、MmGetPhysicalAddress（）

MmGetPhysicalAddress

PHYSICAL_ADDRESS
  MmGetPhysicalAddress(
  IN PVOID BaseAddress
  );

MmGetPhysicalAddress returns the physical address corresponding to a valid virtual address.

Parameters

BaseAddress

Points to the virtual address for which to return the physical address.

Include

ntddk.h

Return Value

MmGetPhysicalAddress returns the physical address that corresponds to the given virtual address.

Comments

Callers of MmGetPhysicalAddress can be running at any IRQL, provided that the BaseAddress value is valid.

MmAllocateContiguousMemory allocates a range of physically contiguous, cache-aligned memory from nonpaged pool.

Parameters

NumberOfBytes

Specifies the size in bytes of the block of contiguous memory to be allocated.

HighestAcceptableAddress

Specifies the highest valid physical address the driver can use. For example, if a device can only reference physical memory in the lower 16MB, this value would be set to 0x00000000FFFFFF.