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From: Michael Zimmermann <sigmaepsilon92@gmail.com>
To: edk2-devel@lists.01.org
Cc: Leif Lindholm <leif.lindholm@linaro.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH] ArmPkg/Library/ArmLib: add ArmWriteSctlr
Date: Wed, 10 Jan 2018 07:38:23 +0100	[thread overview]
Message-ID: <20180110063823.19911-1-sigmaepsilon92@gmail.com> (raw)

This currently isn't needed by anything in the edk2 tree but
it's useful for externally maintained platforms which have
to set this register e.g. to disable alignment aborts.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael Zimmermann <sigmaepsilon92@gmail.com>
---
 ArmPkg/Include/Library/ArmLib.h             | 6 ++++++
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S   | 4 ++++
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 24e84c7a1965..ffda50e9d767 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -558,6 +558,12 @@ ArmReadSctlr (
   VOID
   );
 
+VOID
+EFIAPI
+ArmWriteSctlr (
+  IN  UINT32   Value
+  );
+
 UINTN
 EFIAPI
 ArmReadHVBar (
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
index a0b5ed500298..149b57e059ee 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
@@ -153,6 +153,10 @@ ASM_FUNC(ArmReadSctlr)
   mrc     p15, 0, r0, c1, c0, 0      @ Read SCTLR into R0 (Read control register configuration data)
   bx      lr
 
+ASM_FUNC(ArmWriteSctlr)
+  mcr     p15, 0, r0, c1, c0, 0
+  bx      lr
+
 ASM_FUNC(ArmReadCpuActlr)
   mrc     p15, 0, r0, c1, c0, 1
   bx      lr
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
index 85b0feee20d4..219140c22b13 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
@@ -155,6 +155,9 @@
   mrc     p15, 0, r0, c1, c0, 0      // Read SCTLR into R0 (Read control register configuration data)
   bx      lr
 
+ RVCT_ASM_EXPORT ArmWriteSctlr
+  mcr     p15, 0, r0, c1, c0, 0
+  bx      lr
 
  RVCT_ASM_EXPORT ArmReadCpuActlr
   mrc     p15, 0, r0, c1, c0, 1
-- 
2.15.1



             reply	other threads:[~2018-01-10  6:33 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-10  6:38 Michael Zimmermann [this message]
2018-01-12  8:42 ` [PATCH] ArmPkg/Library/ArmLib: add ArmWriteSctlr Ard Biesheuvel

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