Intel Extensible Firmware Interface, Specification

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32/64-bit UNDI Specification
Version 1.02 12/12/00 409
G.3.5 Compound Types
All PXE structures must be byte packed.
G.3.5.1 PXE_HW_UNDI
This section defines the C structures and #defines for the !PXE H/W UNDI interface.
#pragma pack(1)
typedef struct s_pxe_hw_undi {
PXE_UINT32 Signature; // PXE_ROMID_SIGNATURE
PXE_UINT8 Len; // sizeof(PXE_HW_UNDI)
PXE_UINT8 Fudge; // makes 8-bit cksum equal zero
PXE_UINT8 Rev; // PXE_ROMID_REV
PXE_UINT8 IFcnt; // physical connector count
PXE_UINT8 MajorVer; // PXE_ROMID_MAJORVER
PXE_UINT8 MinorVer; // PXE_ROMID_MINORVER
PXE_UINT16 reserved; // zero, not used
PXE_UINT32 Implementation; // implementation flags
} PXE_HW_UNDI;
#pragma pack()
// Status port bit definitions
// UNDI operation state
#define PXE_HWSTAT_STATE_MASK 0xC0000000
#define PXE_HWSTAT_BUSY 0xC0000000
#define PXE_HWSTAT_INITIALIZED 0x80000000
#define PXE_HWSTAT_STARTED 0x40000000
#define PXE_HWSTAT_STOPPED 0x00000000