dmachannel.cpp

来自「WinCE 3.0 BSP, 包含Inter SA1110, Intel_815」· C++ 代码 · 共 42 行

// DMAChannel.cpp: implementation of the CDMAChannel class.
//
//////////////////////////////////////////////////////////////////////

#include "includes.h"
#include "DMAChannel.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDMAChannel::CDMAChannel():
	CMemoryBuffer()
{
	FUNCMSG("+CDMAChannel::CDMAChannel()");
}

CDMAChannel::~CDMAChannel()
{
}

PSGD_FORMAT CDMAChannel::GetEntry(UINT uEntry)
{
	if (uEntry >= m_nEntries)
		return NULL;
	return ((PSGD_FORMAT)GetVirtualAddress()) + uEntry;
}

bool CDMAChannel::ReservePhysicalMem(ULONG dwSize)
{
	FUNCMSG1("+CDMAChannel::ReservePhysicalMem(%d)", dwSize);
	if (dwSize < sizeof(SGD_FORMAT))
	{
		ERRMSG("CDMAChannel::ReservePhysicalMem: Can't reserve less than one SGD_FORMAT entry");
		return false;
	}
	if (!CMemoryBuffer::ReservePhysicalMem(dwSize))
		return false;
	m_nEntries = dwSize / sizeof(SGD_FORMAT);
	return true;
}