Ovmf/Xen: move XenBusDxe hypercall code to separate library

This moves all of the Xen hypercall code that was private to XenBusDxe
to a new library class XenHypercallLib. This will allow us to reimplement
it for ARM, and to export the Xen hypercall functionality to other parts
of the code, such as a Xen console SerialPortLib driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16970 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-02-28 20:32:39 +00:00
committed by lersek
parent bbc3758ab5
commit cd8ff8fdda
15 changed files with 149 additions and 84 deletions

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SECTION .text
; INTN
; EFIAPI
; __XenHypercall2 (
; IN VOID *HypercallAddr,
; IN OUT INTN Arg1,
; IN OUT INTN Arg2
; );
global ASM_PFX(__XenHypercall2)
ASM_PFX(__XenHypercall2):
; Save only ebx, ecx is supposed to be a scratch register and needs to be
; saved by the caller
push ebx
; Copy HypercallAddr to eax
mov eax, [esp + 8]
; Copy Arg1 to the register expected by Xen
mov ebx, [esp + 12]
; Copy Arg2 to the register expected by Xen
mov ecx, [esp + 16]
; Call HypercallAddr
call eax
pop ebx
ret

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DEFAULT REL
SECTION .text
; INTN
; EFIAPI
; __XenHypercall2 (
; IN VOID *HypercallAddr,
; IN OUT INTN Arg1,
; IN OUT INTN Arg2
; );
global ASM_PFX(__XenHypercall2)
ASM_PFX(__XenHypercall2):
push rdi
push rsi
; Copy HypercallAddr to rax
mov rax, rcx
; Copy Arg1 to the register expected by Xen
mov rdi, rdx
; Copy Arg2 to the register expected by Xen
mov rsi, r8
; Call HypercallAddr
call rax
pop rsi
pop rdi
ret

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/** @file
Functions to make Xen hypercalls.
Copyright (C) 2014, Citrix Ltd.
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.
**/
#include <PiDxe.h>
#include <IndustryStandard/Xen/hvm/params.h>
#include <IndustryStandard/Xen/memory.h>
#include <Library/DebugLib.h>
#include <Library/XenHypercallLib.h>
UINT64
XenHypercallHvmGetParam (
IN UINT32 Index
)
{
xen_hvm_param_t Parameter;
INTN Error;
Parameter.domid = DOMID_SELF;
Parameter.index = Index;
Error = XenHypercall2 (__HYPERVISOR_hvm_op,
HVMOP_get_param, (INTN) &Parameter);
if (Error != 0) {
DEBUG ((EFI_D_ERROR,
"XenHypercall: Error %d trying to get HVM parameter %d\n",
Error, Index));
return 0;
}
return Parameter.value;
}
INTN
XenHypercallMemoryOp (
IN UINTN Operation,
IN OUT VOID *Arguments
)
{
return XenHypercall2 (__HYPERVISOR_memory_op,
Operation, (INTN) Arguments);
}
INTN
XenHypercallEventChannelOp (
IN INTN Operation,
IN OUT VOID *Arguments
)
{
return XenHypercall2 (__HYPERVISOR_event_channel_op,
Operation, (INTN) Arguments);
}

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/** @file
Xen Hypercall Library implementation for Intel architecture
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 that 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.
**/
#include <PiDxe.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Guid/XenInfo.h>
STATIC VOID *HyperPage;
//
// Interface exposed by the ASM implementation of the core hypercall
//
INTN
EFIAPI
__XenHypercall2 (
IN VOID *HypercallAddr,
IN OUT INTN Arg1,
IN OUT INTN Arg2
);
/**
Library constructor: retrieves the Hyperpage address
from the gEfiXenInfoGuid HOB
**/
RETURN_STATUS
EFIAPI
XenHypercallLibIntelInit (
VOID
)
{
EFI_HOB_GUID_TYPE *GuidHob;
EFI_XEN_INFO *XenInfo;
GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
if (GuidHob == NULL) {
return RETURN_NOT_FOUND;
}
XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
HyperPage = XenInfo->HyperPages;
return RETURN_SUCCESS;
}
/**
This function will put the two arguments in the right place (registers) and
invoke the hypercall identified by HypercallID.
@param HypercallID The symbolic ID of the hypercall to be invoked
@param Arg1 First argument.
@param Arg2 Second argument.
@return Return 0 if success otherwise it return an errno.
**/
INTN
EFIAPI
XenHypercall2 (
IN UINTN HypercallID,
IN OUT INTN Arg1,
IN OUT INTN Arg2
)
{
ASSERT (HyperPage != NULL);
return __XenHypercall2 ((UINT8*)HyperPage + HypercallID * 32, Arg1, Arg2);
}

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## @file
# Xen Hypercall abstraction lib for Intel architecture
#
# 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 = XenHypercallLibIntel
FILE_GUID = B5EE9A32-CA5A-49A8-82E3-ADA4CCB77C7C
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = XenHypercallLib|DXE_DRIVER UEFI_DRIVER
CONSTRUCTOR = XenHypercallLibIntelInit
#
# The following information is for reference only and not required by the build tools.
#
# VALID_ARCHITECTURES = IA32 X64
#
[Sources]
XenHypercallIntel.c
[Sources.IA32]
Ia32/hypercall.nasm
[Sources.X64]
X64/hypercall.nasm
[Sources]
XenHypercall.c
[Packages]
MdePkg/MdePkg.dec
OvmfPkg/OvmfPkg.dec
[LibraryClasses]
BaseLib
HobLib
DebugLib
[Guids]
gEfiXenInfoGuid