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ArmPkg/ArmV7Lib: add function to test for presence of MP extensions

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Some MMU manipulation is dependent on the presence of the multiprocessing
extensions. So add a function that returns this information.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18895 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-11-18 15:58:46 +00:00
committed by abiesheuvel
parent 63dbd62964
commit 2ea66ed9f9
3 changed files with 20 additions and 0 deletions
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7
ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm
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@@ -15,6 +15,7 @@
EXPORT ArmIsMpCore
EXPORT ArmHasMpExtensions
EXPORT ArmEnableAsynchronousAbort
EXPORT ArmDisableAsynchronousAbort
EXPORT ArmEnableIrq
@@ -43,6 +44,12 @@ ArmIsMpCore
movne R0, #0
bx LR
ArmHasMpExtensions
mrc p15,0,R0,c0,c0,5
// Get Multiprocessing extension (bit31)
lsr R0, R0, #31
bx LR
ArmEnableAsynchronousAbort
cpsie a
isb