VioGetPhysBuf

typedef struct _VIOPHYSBUF {   /* viopb */
  PBYTE    pBuf;               /* Buffer start address */
  ULONG    cb;                 /* Buffer length */
  SEL      asel[1];            /* Selector list */
} VIOPHYSBUF;

#define INCL_VIO

USHORT  rc = VioGetPhysBuf(Structure, Reserved);

PVIOPHYSBUF      Structure;     /* Data structure */
USHORT           Reserved;      /* Reserved (must be zero) */

USHORT           rc;            /* return code */