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ArmPkg: Add ArmHvcLib 

This is a utility library closely modeled after ArmSmcLib, that allows
hypervisor call (HVC) instructions to be issued from C code.

Change-Id: I5f5c65f83e910ff98dbb2f5b031dad8c4f663daa
Contributed-under: TianoCore Contribution Agreement 1.0
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16088 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel 2014-09-10 18:46:23 +00:00 committed by oliviermartin
parent ae9bc0576c
commit 58e92b394e
6 changed files with 229 additions and 1 deletions
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4
ArmPkg/ArmPkg.dsc
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@ -36,7 +36,8 @@
GCC:*_*_ARM_PLATFORM_FLAGS == -march=armv7-a -mfpu=neon
GCC:RELEASE_*_*_CC_FLAGS = -DMDEPKG_NDEBUG
RVCT:*_*_ARM_PLATFORM_FLAGS == --cpu Cortex-A8
# We use A15 to get the Secure and Virtualization extensions
RVCT:*_*_ARM_PLATFORM_FLAGS == --cpu Cortex-A15
RVCT:RELEASE_*_*_CC_FLAGS = -DMDEPKG_NDEBUG
[LibraryClasses.common]
@ -130,6 +131,7 @@
ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
ArmPkg/Library/ArmSmcLibNull/ArmSmcLibNull.inf
ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf
ArmPkg/Filesystem/SemihostFs/SemihostFs.inf

46
ArmPkg/Include/Library/ArmHvcLib.h Normal file
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@ -0,0 +1,46 @@
/** @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;
UINTN Arg4;
UINTN Arg5;
UINTN Arg6;
UINTN Arg7;
} ARM_HVC_ARGS;
/**
Trigger an HVC call
HVC calls can take up to 8 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

42
ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S Normal file
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@ -0,0 +1,42 @@
//
// 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 x6, x7, [x0, #48]
ldp x4, x5, [x0, #32]
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]
mov x0, x9
ret

53
ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.S Normal file
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@ -0,0 +1,53 @@
//
// 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):
push {r4-r8}
// r0 will be popped just after the HVC call
push {r0}
// Load the HVC arguments values into the appropriate registers
ldr r7, [r0, #28]
ldr r6, [r0, #24]
ldr r5, [r0, #20]
ldr r4, [r0, #16]
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 r8
pop {r8}
// Load the HVC returned values into the appropriate registers
// A HVC call can return up to 4 values - we do not need to store back r4-r7.
str r3, [r8, #12]
str r2, [r8, #8]
str r1, [r8, #4]
str r0, [r8, #0]
mov r0, r8
// Restore the registers r4-r8
pop {r4-r8}
bx lr

53
ArmPkg/Library/ArmHvcLib/Arm/ArmHvc.asm Normal file
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@ -0,0 +1,53 @@
//
// 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
push {r4-r8}
// r0 will be popped just after the HVC call
push {r0}
// Load the HVC arguments values into the appropriate registers
ldr r7, [r0, #28]
ldr r6, [r0, #24]
ldr r5, [r0, #20]
ldr r4, [r0, #16]
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 r8
pop {r8}
// Load the HVC returned values into the appropriate registers
// A HVC call can return up to 4 values - we do not need to store back r4-r7.
str r3, [r8, #12]
str r2, [r8, #8]
str r1, [r8, #4]
str r0, [r8, #0]
mov r0, r8
// Restore the registers r4-r8
pop {r4-r8}
bx lr
END

32
ArmPkg/Library/ArmHvcLib/ArmHvcLib.inf Normal file
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@ -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