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aarch64 haskell+design: update exec spec to use semi-lazy FPU switching
Signed-off-by: Corey Lewis <[email protected]>
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(* | ||
* Copyright 2024, Proofcraft Pty Ltd | ||
* | ||
* SPDX-License-Identifier: GPL-2.0-only | ||
*) | ||
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chapter "FPU" | ||
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theory FPU_H | ||
imports | ||
Hardware_H | ||
TCBDecls_H | ||
begin | ||
context Arch begin arch_global_naming (H) | ||
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#INCLUDE_HASKELL SEL4/Object/FPU/AARCH64.hs CONTEXT AARCH64_H ArchInv=Arch | ||
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end | ||
end |
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-- | ||
-- Copyright 2024, Proofcraft Pty Ltd | ||
-- | ||
-- SPDX-License-Identifier: GPL-2.0-only | ||
-- | ||
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{-# LANGUAGE CPP #-} | ||
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module SEL4.Object.FPU.AARCH64 where | ||
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import SEL4.Machine | ||
import SEL4.Model | ||
import SEL4.Object.Structures | ||
import SEL4.Machine.Hardware.AARCH64 | ||
import SEL4.Machine.RegisterSet.AARCH64 | ||
import SEL4.Model.StateData.AARCH64 | ||
import {-# SOURCE #-} SEL4.Object.TCB(asUser, threadGet) | ||
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import Data.Bits | ||
import Data.Maybe | ||
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saveFpuState :: PPtr TCB -> Kernel () | ||
saveFpuState tcbPtr = do | ||
fpuState <- doMachineOp readFpuState | ||
asUser tcbPtr (setFPUState fpuState) | ||
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loadFpuState :: PPtr TCB -> Kernel () | ||
loadFpuState tcbPtr = do | ||
fpuState <- asUser tcbPtr getFPUState | ||
doMachineOp (writeFpuState fpuState) | ||
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switchLocalFpuOwner :: Maybe (PPtr TCB) -> Kernel () | ||
switchLocalFpuOwner newOwner = do | ||
doMachineOp enableFpu | ||
curFpuOwner <- gets (armKSCurFPUOwner . ksArchState) | ||
when (isJust curFpuOwner) (saveFpuState (fromJust curFpuOwner)) | ||
if isJust newOwner | ||
then loadFpuState (fromJust newOwner) | ||
else doMachineOp disableFpu | ||
modifyArchState (\s -> s { armKSCurFPUOwner = newOwner }) | ||
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fpuRelease :: PPtr TCB -> Kernel () | ||
fpuRelease tcbPtr = do | ||
curFpuOwner <- gets (armKSCurFPUOwner . ksArchState) | ||
when (curFpuOwner /= Just tcbPtr) (switchLocalFpuOwner Nothing) | ||
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lazyFpuRestore :: PPtr TCB -> Kernel () | ||
lazyFpuRestore tcbPtr = do | ||
flags <- threadGet tcbFlags tcbPtr | ||
if (tcbFlagToWord (ArchFlag FpuDisabled) .&. flags /= 0) | ||
then doMachineOp disableFpu | ||
else do | ||
doMachineOp enableFpu | ||
switchLocalFpuOwner (Just tcbPtr) |
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