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 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel