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* [PATCH 1/1] ArmPkg: Add SMC helper functions
@ 2021-10-19 20:35 Rebecca Cran
  2021-10-22 15:08 ` Ard Biesheuvel
  0 siblings, 1 reply; 3+ messages in thread
From: Rebecca Cran @ 2021-10-19 20:35 UTC (permalink / raw)
  To: Sami Mujawar, Ard Biesheuvel, Gerd Hoffmann, Samer El-Haj-Mahmoud,
	Leif Lindholm, devel
  Cc: Rebecca Cran

Add functions ArmCallSmc0/1/2/3 to do SMC calls with 0, 1, 2 or 3
arguments.
The functions return up to 3 values.

Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
---
 ArmPkg/Include/Library/ArmSmcLib.h           |  73 ++++++++++++
 ArmPkg/Library/ArmSmcLib/ArmSmc.c            | 122 ++++++++++++++++++++
 ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf       |   3 +
 ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.c |  85 ++++++++++++++
 4 files changed, 283 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmSmcLib.h b/ArmPkg/Include/Library/ArmSmcLib.h
index ced60b3c1147..343ae7f40ad2 100644
--- a/ArmPkg/Include/Library/ArmSmcLib.h
+++ b/ArmPkg/Include/Library/ArmSmcLib.h
@@ -1,5 +1,6 @@
 /** @file
 *
+*  Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
 *  Copyright (c) 2012-2014, ARM Limited. All rights reserved.
 *
 *  SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -37,4 +38,76 @@ ArmCallSmc (
   IN OUT ARM_SMC_ARGS *Args
   );
 
+/** Trigger an SMC call with 3 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Argument/result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc3 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+  IN OUT UINTN *Arg3
+  );
+
+/** Trigger an SMC call with 2 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc2 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  );
+
+/** Trigger an SMC call with 1 argument.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc1 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  );
+
+/** Trigger an SMC call with 0 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc0 (
+  IN     UINTN Function,
+     OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  );
+
 #endif // ARM_SMC_LIB_H_
diff --git a/ArmPkg/Library/ArmSmcLib/ArmSmc.c b/ArmPkg/Library/ArmSmcLib/ArmSmc.c
new file mode 100644
index 000000000000..d596003a857e
--- /dev/null
+++ b/ArmPkg/Library/ArmSmcLib/ArmSmc.c
@@ -0,0 +1,122 @@
+/** @file
+  SMC helper functions.
+
+  Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/ArmSmcLib.h>
+
+/** Triggers an SMC call with 3 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Argument/result.
+
+  @return The SMC error code.
+**/
+UINTN
+ArmCallSmc3 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+  IN OUT UINTN *Arg3
+  )
+{
+  ARM_SMC_ARGS Args;
+  UINTN        ErrorCode;
+
+  Args.Arg0 = Function;
+
+  if (Arg1 != NULL) {
+    Args.Arg1 = *Arg1;
+  }
+  if (Arg2 != NULL) {
+    Args.Arg2 = *Arg2;
+  }
+  if (Arg3 != NULL) {
+    Args.Arg3 = *Arg3;
+  }
+
+  ArmCallSmc (&Args);
+
+  ErrorCode = Args.Arg0;
+
+  if (Arg1 != NULL) {
+    *Arg1 = Args.Arg1;
+  }
+  if (Arg2 != NULL) {
+    *Arg2 = Args.Arg2;
+  }
+  if (Arg3 != NULL) {
+    *Arg3 = Args.Arg3;
+  }
+
+  return ErrorCode;
+}
+
+/** Trigger an SMC call with 2 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc2 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return ArmCallSmc3 (Function, Arg1, Arg2, Arg3);
+}
+
+/** Trigger an SMC call with 1 argument.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc1 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return ArmCallSmc3 (Function, Arg1, Arg2, Arg3);
+}
+
+/** Trigger an SMC call with 0 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc0 (
+  IN     UINTN Function,
+     OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return ArmCallSmc3 (Function, Arg1, Arg2, Arg3);
+}
diff --git a/ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf b/ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
index 4f4b09f4528a..a89f9203fb7e 100644
--- a/ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
+++ b/ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
@@ -20,6 +20,9 @@
 [Sources.AARCH64]
   AArch64/ArmSmc.S
 
+[Sources]
+  ArmSmc.c
+
 [Packages]
   MdePkg/MdePkg.dec
   ArmPkg/ArmPkg.dec
diff --git a/ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.c b/ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.c
index 2d79aadaf1fa..ca1b8830a119 100644
--- a/ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.c
+++ b/ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.c
@@ -1,4 +1,5 @@
 //
+//  Copyright (c) 2021, NUVIA Inc. All rights reserved.
 //  Copyright (c) 2016, Linaro Limited. All rights reserved.
 //
 //  SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -7,6 +8,7 @@
 
 #include <Base.h>
 #include <Library/ArmSmcLib.h>
+#include <IndustryStandard/ArmStdSmc.h>
 
 VOID
 ArmCallSmc (
@@ -14,3 +16,86 @@ ArmCallSmc (
   )
 {
 }
+
+/** Triggers an SMC call with 3 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Argument/result.
+
+  @return The SMC error code.
+**/
+UINTN
+ArmCallSmc3 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+  IN OUT UINTN *Arg3
+  )
+{
+  return SMC_ARCH_CALL_NOT_SUPPORTED;
+}
+
+/** Trigger an SMC call with 2 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Argument/result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc2 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+  IN OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return SMC_ARCH_CALL_NOT_SUPPORTED;
+}
+
+/** Trigger an SMC call with 1 argument.
+
+  @param Function The SMC function.
+  @param Arg1     Argument/result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc1 (
+  IN     UINTN Function,
+  IN OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return SMC_ARCH_CALL_NOT_SUPPORTED;
+}
+
+/** Trigger an SMC call with 0 arguments.
+
+  @param Function The SMC function.
+  @param Arg1     Result.
+  @param Arg2     Result.
+  @param Arg3     Result.
+
+  @return The SMC error code.
+
+**/
+UINTN
+ArmCallSmc0 (
+  IN     UINTN Function,
+     OUT UINTN *Arg1,
+     OUT UINTN *Arg2,
+     OUT UINTN *Arg3
+  )
+{
+  return SMC_ARCH_CALL_NOT_SUPPORTED;
+}
-- 
2.31.1


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2021-10-19 20:35 [PATCH 1/1] ArmPkg: Add SMC helper functions Rebecca Cran
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