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.biesheu...@linaro.org>
---
ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.S | 7 +++++++
ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm | 7 +++++++
ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h | 6 ++++++
3 files changed, 20 insertions(+)
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.S
b/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.S
index b94239f785c7..d9e3c86b6907 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.S
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.S
@@ -19,6 +19,7 @@
.align 2
GCC_ASM_EXPORT(ArmIsMpCore)
+GCC_ASM_EXPORT(ArmHasMpExtensions)
GCC_ASM_EXPORT(ArmEnableAsynchronousAbort)
GCC_ASM_EXPORT(ArmDisableAsynchronousAbort)
GCC_ASM_EXPORT(ArmEnableIrq)
@@ -44,6 +45,12 @@ ASM_PFX(ArmIsMpCore):
movne R0, #0
bx LR
+ASM_PFX(ArmHasMpExtensions):
+ mrc p15,0,R0,c0,c0,5
+ // Get Multiprocessing extension (bit31)
+ lsr R0, R0, #31
+ bx LR
+
ASM_PFX(ArmEnableAsynchronousAbort):
cpsie a
isb
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm
b/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm
index 82daa3ce1698..817923225353 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmLibSupportV7.asm
@@ -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
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
index df770cf7d798..e138613ca548 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
@@ -28,5 +28,11 @@ ArmReadIdMmfr0 (
VOID
);
+BOOLEAN
+EFIAPI
+ArmHasMpExtensions (
+ VOID
+ );
+
#endif // __ARM_V7_LIB_H__
--
1.9.1
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