tilelink: split Acquire into Acquire{Block,Perm} (#1030)
We had planned for a while to add an 'Overwrite' message which obtains permissions without requiring retrieval of data. This is useful whenever a master knows it will completely replace the contents of a cache block. Instead of calling it Overwrite, we decided to split the Acquire type. If you AcquirePerm, you MUST Release and ProbeAck with Data.
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@ -22,7 +22,8 @@ object TLMessages
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def LogicalData = UInt(3) // . . => AccessAckData
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def Get = UInt(4) // . . => AccessAckData
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def Hint = UInt(5) // . . => HintAck
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def Acquire = UInt(6) // . => Grant[Data]
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def AcquireBlock = UInt(6) // . => Grant[Data]
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def AcquirePerm = UInt(7) // . => Grant[Data]
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def Probe = UInt(6) // . => ProbeAck[Data]
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def AccessAck = UInt(0) // . .
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def AccessAckData = UInt(1) // . .
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@ -36,7 +37,7 @@ object TLMessages
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def ReleaseAck = UInt(6) // .
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def GrantAck = UInt(0) // .
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def isA(x: UInt) = x <= Acquire
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def isA(x: UInt) = x <= AcquirePerm
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def isB(x: UInt) = x <= Probe
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def isC(x: UInt) = x <= ReleaseData
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def isD(x: UInt) = x <= ReleaseAck
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