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+/** @file
+*
+* Copyright (c) 2012-2014, ARM Limited. All rights reserved.
+*
+* This program and the accompanying materials
+* are licensed and made available under the terms and conditions of the BSD License
+* which accompanies this distribution. The full text of the license may be found at
+* http://opensource.org/licenses/bsd-license.php
+*
+* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#ifndef __ARM_HVC_LIB__
+#define __ARM_HVC_LIB__
+
+/**
+ * The size of the HVC arguments are different between AArch64 and AArch32.
+ * The native size is used for the arguments.
+ */
+typedef struct {
+ UINTN Arg0;
+ UINTN Arg1;
+ UINTN Arg2;
+ UINTN Arg3;
+} ARM_HVC_ARGS;
+
+/**
+ Trigger an HVC call
+
+ HVC calls can take up to 4 arguments and return up to 4 return values.
+ Therefore, the 4 first fields in the ARM_HVC_ARGS structure are used
+ for both input and output values.
+
+**/
+VOID
+ArmCallHvc (
+ IN OUT ARM_HVC_ARGS *Args
+ );
+
+#endif
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+//
+// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
+// Copyright (c) 2014, Linaro Limited. All rights reserved.
+//
+// This program and the accompanying materials
+// are licensed and made available under the terms and conditions of the BSD License
+// which accompanies this distribution. The full text of the license may be found at
+// http://opensource.org/licenses/bsd-license.php
+//
+// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//
+
+.text
+.align 3
+
+GCC_ASM_EXPORT(ArmCallHvc)
+
+ASM_PFX(ArmCallHvc):
+ // Push x0 on the stack
+ str x0, [sp, #-8]!
+
+ // Load the HVC arguments values into the appropriate registers
+ ldp x2, x3, [x0, #16]
+ ldp x0, x1, [x0, #0]
+
+ hvc #0
+
+ // Pop the ARM_HVC_ARGS structure address from the stack into x9
+ ldr x9, [sp], #8
+
+ // Store the HVC returned values into the appropriate registers
+ // A HVC call can return up to 4 values
+ stp x2, x3, [x9, #16]
+ stp x0, x1, [x9, #0]
+
+ ret
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+//
+// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
+// Copyright (c) 2014, Linaro Limited. All rights reserved.
+//
+// This program and the accompanying materials
+// are licensed and made available under the terms and conditions of the BSD License
+// which accompanies this distribution. The full text of the license may be found at
+// http://opensource.org/licenses/bsd-license.php
+//
+// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//
+
+.text
+.align 3
+.arch_extension virt
+
+GCC_ASM_EXPORT(ArmCallHvc)
+
+ASM_PFX(ArmCallHvc):
+ // r0 will be popped just after the HVC call
+ push {r0}
+
+ // Load the HVC arguments values into the appropriate registers
+ ldr r3, [r0, #12]
+ ldr r2, [r0, #8]
+ ldr r1, [r0, #4]
+ ldr r0, [r0, #0]
+
+ hvc #0
+
+ // Pop the ARM_HVC_ARGS structure address from the stack into ip
+ pop {ip}
+
+ // Load the HVC returned values into the appropriate registers
+ // A HVC call can return up to 4 values
+ str r3, [ip, #12]
+ str r2, [ip, #8]
+ str r1, [ip, #4]
+ str r0, [ip, #0]
+
+ bx lr
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+//
+// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
+// Copyright (c) 2014, Linaro Limited. All rights reserved.
+//
+// This program and the accompanying materials
+// are licensed and made available under the terms and conditions of the BSD License
+// which accompanies this distribution. The full text of the license may be found at
+// http://opensource.org/licenses/bsd-license.php
+//
+// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//
+
+ EXPORT ArmCallHvc
+
+ AREA ArmHvc, CODE, READONLY
+
+ArmCallHvc
+ // r0 will be popped just after the HVC call
+ pop {r0}
+
+ // Load the HVC arguments values into the appropriate registers
+ ldr r3, [r0, #12]
+ ldr r2, [r0, #8]
+ ldr r1, [r0, #4]
+ ldr r0, [r0, #0]
+
+ hvc #0
+
+ // Pop the ARM_HVC_ARGS structure address from the stack into ip
+ pop {ip}
+
+ // Load the HVC returned values into the appropriate registers
+ // A HVC call can return up to 4 values
+ str r3, [ip, #12]
+ str r2, [ip, #8]
+ str r1, [ip, #4]
+ str r0, [ip, #0]
+
+ bx lr
+
+ END
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+#/** @file
+#
+# Copyright (c) 2012-2013, ARM Ltd. All rights reserved.<BR>
+# Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#**/
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = ArmHvcLib
+ FILE_GUID = E594959A-D150-44D3-963B-BA90329D3D9A
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = ArmHvcLib
+
+[Sources.ARM]
+ Arm/ArmHvc.asm | RVCT
+ Arm/ArmHvc.S | GCC
+
+[Sources.AARCH64]
+ AArch64/ArmHvc.S
+
+[Packages]
+ MdePkg/MdePkg.dec
+ ArmPkg/ArmPkg.dec
This is a utility library closely modeled after ArmSmcLib, that allows hypervisor call (HVC) instructions to be issued from C code. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- ArmPkg/Include/Library/ArmHvcLib.h | 42 ++++++++++++++++++++++++++++++ ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S | 38 +++++++++++++++++++++++++++ ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S | 43 +++++++++++++++++++++++++++++++ ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm | 43 +++++++++++++++++++++++++++++++ ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf | 32 +++++++++++++++++++++++ 5 files changed, 198 insertions(+) create mode 100644 ArmPkg/Include/Library/ArmHvcLib.h create mode 100644 ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S create mode 100644 ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S create mode 100644 ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm create mode 100644 ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf