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[edk2,v4,1/3] ArmVExpressPkg: use PSCI for system reset at runtime

Message ID 1430719471-16998-2-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel May 4, 2015, 6:04 a.m. UTC 
Since the default EfiResetSystemLib for VExpress cannot be used at
runtime (due to the fact that its MMIO registers need to be owned
by the OS and so cannot be runtime remapped), instead use PSCI calls
into EL3 at runtime.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPlatformPkg/ArmVExpressPkg/ArmVExpress.dsc.inc | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress.dsc.inc b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress.dsc.inc
index 8dd20ca0abc2..7a8bb8ecd0dd 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress.dsc.inc
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress.dsc.inc
@@ -215,6 +215,15 @@ 
   ReportStatusCodeLib|IntelFrameworkModulePkg/Library/DxeReportStatusCodeLibFramework/DxeReportStatusCodeLib.inf
   CapsuleLib|MdeModulePkg/Library/DxeCapsuleLibNull/DxeCapsuleLibNull.inf
 
+  #
+  # PSCI support in EL3 may not be available if we are not running under a PSCI
+  # compliant secure firmware, but since the default VExpress EfiResetSystemLib
+  # cannot be supported at runtime (due to the fact that the syscfg MMIO registers
+  # cannot be runtime remapped), it is our best bet to get ResetSystem functionality
+  # on these platforms.
+  #
+  EfiResetSystemLib|ArmPkg/Library/ArmPsciResetSystemLib/ArmPsciResetSystemLib.inf
+
 [LibraryClasses.ARM, LibraryClasses.AARCH64]
   #
   # It is not possible to prevent the ARM compiler for generic intrinsic functions.