physical disk operation in EDK NT32 platform

libeili · 发表于 2009-3-23 18:00:26

在EDK source中提供了对physical 和vitural disk的operation
参数设置：EDK_SOURCE\sample\platform\NT32\build中的system.cmd文件
set EFI_WIN_NT_PHYSICAL_DISKS=a:RW;2880;512!//设置一个软盘，大小为1.44M，block size=512
当我们在跑EDK的时候，可以去访问该软盘。其实在EDK中去追踪该代码的时候，会发现，其实质上是在WinNtBlockIoDriver中调用WIN api进行读写，源代码如下：
// set disk type,Physical or Virtual disk? and get the name
if (DiskType == EfiWinNtVirtualDisks) {
WinNtIo->WinNtThunk->SPrintf (
                        Buffer,
                        L"Diskfile%d",
                        WinNtIo->InstanceNumber
                        );
  } else {
if (*Str >= 'A' && *Str <= 'Z' || *Str >= 'a' && *Str <= 'z') {
   WinNtIo->WinNtThunk->SPrintf (Buffer, L"\\\\.\\%c:", *Str);
} else {
   WinNtIo->WinNtThunk->SPrintf (Buffer, L"\\\\.\\PHYSICALDRIVE%c", *Str);
}
//create mapping
Status = WinNtBlockIoCreateMapping (
                  WinNtIo,
                  Handle,
                  Buffer,
                  WriteProtected,
                  RemovableMedia,
                  NumberOfBlocks,
                  BlockSize,
                  DiskType
                  );
//register read or write blocks function
BlockIo->ReadBlocks = WinNtBlockIoReadBlocks;
BlockIo->WriteBlocks = WinNtBlockIoWriteBlocks;

//in the WinNtBlockIoReadBlocks,read file API
Flag = Private->WinNtThunk->ReadFile (Private->NtHandle, Buffer, (DWORD) BufferSize, (LPDWORD) &BytesRead, NULL);

问题如下：
EDK 的NT32下应该是不能对物理设备进行访问的，但是现在却可以访问一个物理disk，试问当connect controller to driver的时候，物理disk controller handle是怎么得到？希望高手解释一下啊

[ 本帖最后由 libeili 于 2009-3-23 18:01 编辑 ]

srcore · 发表于 2009-3-24 16:52:44

没有物理disk controller handle，Win NT bus driver为所有virtual NT thunk device创建device handle.

参见 WinNtBusDriverBindingStart()

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physical disk operation in EDK NT32 platform

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