-- RTQuanta.Mesa
-- last edited June 24, 1980  3:54 PM by Willie Sue

-- last edited May 20, 1982 10:22 am by Paul Rovner

DIRECTORY
  Inline USING[LongNumber];

RTQuanta: DEFINITIONS
= BEGIN

-- CONSTANTS
  LASTAddress: LONG CARDINAL = 17777777B;  -- nonsense, would like LAST[Address]
  PagesPerQuantum: CARDINAL = 4;
  QuantumSize: CARDINAL = PagesPerQuantum*256;

	-- *** NOTE the assumption that LASTAddress/QuantumSize fits in 16 bits
  LASTQuantum: CARDINAL = LOOPHOLE[LASTAddress/QuantumSize,
                                                   Inline.LongNumber].lowbits;
  QuantumIndex: TYPE = [0..LASTQuantum];
  QuantumCount: TYPE = [0..LASTQuantum+1];

-- addresses are stored with the low order 16 bits first
 FullAddress: TYPE = MACHINE DEPENDENT RECORD
  [ qnl: [0..LAST[CARDINAL]/QuantumSize], --QuantumNumberLow
    qOff: [0..QuantumSize), --QuantumNumberOffset
    unused: [0..LAST[CARDINAL]/QuantumSize],
    qnh: [0..QuantumSize) --QuantumNumberHigh
  ];

 QuantumNumber: TYPE = MACHINE DEPENDENT RECORD
  [ qnh: [0..QuantumSize), --QuantumNumberHigh
    qnl: [0..LAST[CARDINAL]/QuantumSize] --QuantumNumberLow
  ];

-- PROCEDURES

  QtmIndexToPtr: PROC[q: QuantumIndex] RETURNS[LONG POINTER] =
  INLINE
  { ptr: LONG POINTER;
    LOOPHOLE[ptr, FullAddress].qnh _ LOOPHOLE[q, QuantumNumber].qnh;
    LOOPHOLE[ptr, FullAddress].qnl _ LOOPHOLE[q, QuantumNumber].qnl;
    LOOPHOLE[ptr, FullAddress].unused _ LOOPHOLE[0];
    LOOPHOLE[ptr, FullAddress].qOff _ LOOPHOLE[0];

   RETURN[ptr];
  };

  PtrToQtmIndex: PROC[ptr: LONG POINTER] RETURNS[QuantumIndex] =
  INLINE
  { q: QuantumIndex;
    LOOPHOLE[q, QuantumNumber].qnh _ LOOPHOLE[ptr, FullAddress].qnh;
    LOOPHOLE[q, QuantumNumber].qnl _ LOOPHOLE[ptr, FullAddress].qnl;
    RETURN[q];
  };

--  just a copy of QtmIndexToPtr
  MapQPtr: PROC[q: QuantumIndex] RETURNS[LONG POINTER] =  INLINE
  { ptr: LONG POINTER;
    LOOPHOLE[ptr, FullAddress].qnh _ LOOPHOLE[q, QuantumNumber].qnh;
    LOOPHOLE[ptr, FullAddress].qnl _ LOOPHOLE[q, QuantumNumber].qnl;
    LOOPHOLE[ptr, FullAddress].unused _ LOOPHOLE[0];
    LOOPHOLE[ptr, FullAddress].qOff _ LOOPHOLE[0];

   RETURN[ptr];
  };

  QuantumSizeMULT: PROC[q: CARDINAL] RETURNS[LONG CARDINAL] =
  INLINE
  { ptr: LONG CARDINAL;
    LOOPHOLE[ptr, FullAddress].qnh _ LOOPHOLE[q, QuantumNumber].qnh;
    LOOPHOLE[ptr, FullAddress].qnl _ LOOPHOLE[q, QuantumNumber].qnl;
    LOOPHOLE[ptr, FullAddress].unused _ LOOPHOLE[0];
    LOOPHOLE[ptr, FullAddress].qOff _ LOOPHOLE[0];

   RETURN[ptr];
  };

  QuantumSizeDIV: PROC[ptr: LONG CARDINAL] RETURNS[QuantumIndex] =
  INLINE
  { q: QuantumIndex;
    LOOPHOLE[q, QuantumNumber].qnh _ LOOPHOLE[ptr, FullAddress].qnh;
    LOOPHOLE[q, QuantumNumber].qnl _ LOOPHOLE[ptr, FullAddress].qnl;
    RETURN[q];
  };

  QuantumSizeMOD: PROC[ptr: LONG CARDINAL] RETURNS[CARDINAL] =
  INLINE { RETURN[LOOPHOLE[ptr, FullAddress].qOff] };

END.