Intel Extensible Firmware Interface Specification page 432

Extensible Firmware Interface Specification
G.3.5.4 PXE_CDB
PXE UNDI command descriptor block.
#pragma pack(1)
typedef struct s_pxe_cdb {
PXE_OPCODE OpCode;
PXE_OPFLAGS OpFlags;
PXE_UINT16 CPBsize;
PXE_UINT16 DBsize;
PXE_UINT64 CPBaddr;
PXE_UINT64 DBaddr;
PXE_STATCODE StatCode;
PXE_STATFLAGS StatFlags;
PXE_UINT16 IFnum;
PXE_CONTROL Control;
} PXE_CDB;
#pragma pack()
G.3.5.5 PXE_IP_ADDR
This storage type is always big endian (network order) not little endian (Intel order).
#pragma pack(1)
typedef union u_pxe_ip_addr {
PXE_IPV6 IPv6;
PXE_IPV4 IPv4;
} PXE_IP_ADDR;
#pragma pack()
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