OEMKDIoControl (Windows Embedded CE 6.0)

1/5/2010

This function is implemented by the OEM to support requests from the kernel debugger.

Syntax

BOOL OEMKDIoControl(
  DWORD dwIoControlCode, 
  LPVOID lpBuf, 
  DWORD nBufSize 
);

Parameters

• dwIoControlCode
  [in] Specifies the function requested by the kernel debugger.

  This parameter can be set to one of the values listed in the following table.

  Control code	Value	Description
  KD_IOCTL_INIT	0x00000000	Initializes the kernel debugger.
  KD_IOCTL_SET_CBP	0x00000001	Sets a code breakpoint. The ulAddress member of the KD_BPINFO structure is set to the address to write the breakpoint. The OEM sets the ulHandle member to the handle of the breakpoint.
  KD_IOCTL_CLEAR_CBP	0x00000002	Clears a code breakpoint. The OEM sets the ulHandle member of KD_BPINFO to the handle of the breakpoint to be cleared.
  KD_IOCTL_QUERY_CBP	0x00000003	Queries the number of code breakpoints available. The OEM sets the ulCount member of KD_BPINFO to the number of code breakpoints available.
  KD_IOCTL_ENUM_CBP	0x00000004	Enumerates the code breakpoints that are set. The ulCount member of KD_BPINFO is incremented from 0 to n, where n is the number of available breakpoints.
  KD_IOCTL_SET_DBP	0x00000010	Sets a data breakpoint. The ulAddress member of KD_BPINFO is set to the address to write the breakpoint. The OEM sets the ulHandle member of KD_BPINFO to the handle of the breakpoint.
  KD_IOCTL_CLEAR_DBP	0x00000011	Clears a data breakpoint. The OEM sets the ulHandle member of KD_BPINFO to the handle of the breakpoint to be cleared.
  KD_IOCTL_QUERY_DBP	0x00000012	Queries the number of data breakpoints available. The OEM sets the ulCount parameter to the number of code breakpoints available.
  KD_IOCTL_ENUM_DBP	0x00000013	Enumerates the data breakpoints that are set. The ulCount parameter is incremented from 0 to n, where n is the number of available breakpoints.
  KD_IOCTL_MAP_EXCEPTION	0x00000020	Maps an exception code to a different code.
  KD_IOCTL_RESET	0x00000030	Resets the kernel debugger.
  KD_IOCTL_JIT_NOTIF	0x00000040	Notifies the JIT debugger.
  KD_IOCTL_DMPGEN_START	0x00000050	Starts error report dump generation.
  KD_IOCTL_DMPGEN_END	0x00000051	Ends error report dump generation.
  KD_IOCTL_MEMORY_INACCESSIBLE	0x00000060	Indicates that memory is inaccessible.

  For more information, see Kernel Debugger IOCTLs.

• lpBuf
  [out] Pointer to a buffer that allocates space for a KD_BPINFO structure.

• nBufSize
  [in] Size of the buffer pointed to by lpInBuf.

  This is set to the size of the KD_BPINFO structure.

Return Value

If this function succeeds, it returns TRUE.

If this function fails, it returns FALSE.

Remarks

This is a restrictive form of the KernelIoControl routine. The context in which the kernel debugger calls this function requires that the OEM operates on the hardware only and does not perform system calls.

The kernel debugger exports a function pointer called pKDIoControl. The OEM must assign the address of the function that handles the IOCTL to this pointer. The assignment must occur immediately when OEMInit is called.

The OEMKDIoControl function is not exposed to any application. The functionality is currently restricted to the kernel debugger.

The following code example shows OEMKDIoControl in the SHx platform code.

extern pKDIoControl;
BOOL OEMKDIoControl(
DWORD dwIoControlCode, 
LPVOID lpBuf, 
DWORD nBufSize,
)
switch ( dwIoControlCode ) {
case KD_IOCTL_SET_CBP:
case KD_IOCTL_CLEAR_CBP:
case KD_IOCTL_QUERY_CBP:
case KD_IOCTL_ENUM_CBP:
case KD_IOCTL_SET_DBP:
case KD_IOCTL_CLEAR_DBP:
case KD_IOCTL_QUERY_DBP:
case KD_IOCTL_ENUM_DBP:
{
PKD_BPINFO *pbp = (PKD_BPINFO)lpBuf;
}
default:
return(FALSE);
}
}
void OEMinit()
{
...
pKDIoControl = OEMKDIoControl;
}

Requirements

See Also

Reference

Optional OAL Functions
OEMInit
KD_BPINFO

Other Resources

KernelIoControl