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.biesheu...@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 diff --git a/ArmPkg/Include/Library/ArmHvcLib.h b/ArmPkg/Include/Library/ArmHvcLib.h new file mode 100644 index 000000000000..b5c3d81cdf3d --- /dev/null +++ b/ArmPkg/Include/Library/ArmHvcLib.h @@ -0,0 +1,42 @@ +/** @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 diff --git a/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S b/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S new file mode 100644 index 000000000000..156e5554cf5b --- /dev/null +++ b/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S @@ -0,0 +1,38 @@ +// +// 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 diff --git a/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S b/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S new file mode 100644 index 000000000000..e48f2ebc2032 --- /dev/null +++ b/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S @@ -0,0 +1,43 @@ +// +// 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 diff --git a/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm b/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm new file mode 100644 index 000000000000..1275f590c8aa --- /dev/null +++ b/ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm @@ -0,0 +1,43 @@ +// +// 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 diff --git a/ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf b/ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf new file mode 100644 index 000000000000..92efac5741c8 --- /dev/null +++ b/ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf @@ -0,0 +1,32 @@ +#/** @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 -- 1.8.3.2 ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. 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