void readPhysicalMemoryMap( HANDLE hPhysMem, u8 *buffer, u64 offset, unsigned int length)
{
unsigned int totalBytes = 0;
unsigned int originalSize = length;
unsigned int pageSize = length;
if(!hPhysMem)
{
throw AccessErrorImpl( _("Handle to physical memory was not set or could not be opened.") );
}
if(0 == buffer)
{
throw AccessErrorImpl( _("Error accessing buffer.") );
}
while(totalBytes != originalSize )
{
DWORD BaseAddr;
DWORD PhysAddr = static_cast<DWORD>(offset);
// OK, first get the page that has the requested offset. This
// function will round-down physaddr to the nearest page boundary,
// and the pageSize will change to the size of the page
if (!MapMem(hPhysMem, (PVOID) &BaseAddr, &PhysAddr, reinterpret_cast<PDWORD>(&pageSize)))
{
throw AccessErrorImpl( _("Error mapping physical memory.") );
}
//Find the index into the page based on requested offset
unsigned int index = static_cast<DWORD>(offset) - PhysAddr;
// Only continue to copy if the index is within the pageSize and
// we still need bytes
while( index < pageSize && totalBytes != originalSize)
{
u64 tmp = BaseAddr + index; // extra tmp to satisfy vc++ /w4
buffer[totalBytes] = *reinterpret_cast<u8 *>(tmp);
index++;
totalBytes++;
}
u64 tmp = BaseAddr; // extra tmp to satisfy vc++ /w4
if (!UnMapMem(reinterpret_cast<PVOID>(tmp)))
{
throw AccessErrorImpl( _("Error unmapping physical memory."));
}
// If the inner while loop exited due to the end of the page, we
// need to update the offset and the remaining size and map
// another page
offset = PhysAddr + index;
pageSize = originalSize-totalBytes;
}
}
/*
* MapVGA --
*
* Map the VGA memory window (0xA0000-0xAFFFF) as read/write memory for
* the process for use in probing memory.
*/
Byte *MapVGA()
{
return( MapMem(0xA0000,0x10000) );
}