DCB_cd_entry

#include <dcb.h>

typedef struct  _DCB_cd_entry { /* */
    PVOID  DCB_cd_io_address;   // address of request routine
    ULONG  DCB_cd_flags;        // demand bits; see below
    ULONG  DCB_cd_ddb;          // driver's DDB pointer
    ULONG  DCB_cd_next;         // address of next cd entry
    USHORT DCB_cd_expan_off;    // offset of expansion area
    UCHAR  DCB_cd_layer_flags;  // flags for layer's use
    UCHAR  DCB_cd_lgn;          // load group number
} DCB_cd_entry, *pDCB_cd_entry;

Contains information about a calldown entry.

DCB_cd_flags

Can be one of these values:

DCB_dmd_srb_cdb	There must be an SRB and CDB for each IOR.
DCB_dmd_rsrv_1	Reserved; must be zero.
DCB_dmd_logical	Media address must be logical and DCB must be for a logical device.
DCB_dmd_physical	Media adresses must be physical and DCB must be for a physical device.
DCB_dmd_small_memory	Data buffers must reside in in low 16M.
DCB_dmd_rsrv_2	Reserved; must be zero.
DCB_dmd_rsrv_3	Reserved; must be zero.
DCB_dmd_rsrv_4	Reserved; must be zero.
DCB_dmd_not_512	Sector size on the media is not 512 bytes.
DCB_dmd_word_align	Data buffers must be word aligned.
DCB_dmd_dword_align	Data buffers must be doubleword aligned.
DCB_dmd_phys_sgd	Scatter/gather descriptors must contain physical addresses (they will contain linear addresses if this demand bit is not set).
DCB_dmd_phys_sgd_ptr	Address of the first scatter/gather descriptor (IOR_sgd_lin_phys member of the IOR structure) must be a physical address (it will be a linear addresses if this demand bit is not set).
DCB_dmd_do_a_b_toggling	For single floppy drive system, voltrack needs to do the toggling between A and B when accesses are made to these drive letters.
DCB_dmd_query_remov	Lower level must be called to check if media is removeable/has changed.
DCB_dmd_request_sns	Port driver cannot perform autosense.
DCB_dmd_lock_unlock_media	Media supports software locking.
DCB_dmd_load_eject_media	Media supports electronic eject.
DCB_dmd_clear_media_chg	Command to clear media change.
DCB_dmd_serialize	Layer requires request serialization.
DCB_dmd_prot_mode	Override real mode checks for this device i.e. ATAPI cdrom.
DCB_dmd_no_xclusive	Indicates exclusive access is not required for abs write.
DCB_dmd_pageability	Indicates that access to this volume can cause paging.