NVME_CONTROLLER_MEMORY_BUFFER_LOCATION union (nvme.h)

Defines the location of the optional Controller Memory Buffer Location register in the CMBLOC field of the NVME_CONTROLLER_REGISTERS structure.

If the Controller Memory Buffer Size CMBSZ field of NVME_CONTROLLER_REGISTERS has a value of 0, this register is reserved.

Syntax

typedef union {
  struct {
    ULONG BIR : 3;
    ULONG Reserved : 9;
    ULONG OFST : 20;
  } DUMMYSTRUCTNAME;
  ULONG  AsUlong;
} NVME_CONTROLLER_MEMORY_BUFFER_LOCATION, *PNVME_CONTROLLER_MEMORY_BUFFER_LOCATION;

Members

DUMMYSTRUCTNAME

DUMMYSTRUCTNAME.BIR

Indicates the Base Address Register (BAR) that contains the Controller Memory Buffer. For a 64-bit BAR, the BAR for the lower 32-bits of the address is specified.

Valid values for this field are: 0h, 2h, 3h, 4h, and 5h.

DUMMYSTRUCTNAME.Reserved

DUMMYSTRUCTNAME.OFST

Indicates the offset of the Controller Memory Buffer in multiples of the Size Unit specified in the CMBSZ field of the NVME_CONTROLLER_REGISTERS structure. This value is 4KB aligned.

AsUlong

Requirements

See also

• NVME_CONTROLLER_REGISTERS
• NVME_CONTROLLER_MEMORY_BUFFER_SIZE