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:
25
OvmfPkg/Library/XenHypercallLib/Ia32/hypercall.nasm
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25
OvmfPkg/Library/XenHypercallLib/Ia32/hypercall.nasm
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SECTION .text
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; INTN
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; EFIAPI
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; __XenHypercall2 (
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; IN VOID *HypercallAddr,
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; IN OUT INTN Arg1,
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; IN OUT INTN Arg2
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; );
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global ASM_PFX(__XenHypercall2)
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ASM_PFX(__XenHypercall2):
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; Save only ebx, ecx is supposed to be a scratch register and needs to be
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; saved by the caller
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push ebx
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; Copy HypercallAddr to eax
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mov eax, [esp + 8]
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; Copy Arg1 to the register expected by Xen
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mov ebx, [esp + 12]
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; Copy Arg2 to the register expected by Xen
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mov ecx, [esp + 16]
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; Call HypercallAddr
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call eax
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pop ebx
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ret
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26
OvmfPkg/Library/XenHypercallLib/X64/hypercall.nasm
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26
OvmfPkg/Library/XenHypercallLib/X64/hypercall.nasm
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DEFAULT REL
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SECTION .text
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; INTN
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; EFIAPI
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; __XenHypercall2 (
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; IN VOID *HypercallAddr,
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; IN OUT INTN Arg1,
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; IN OUT INTN Arg2
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; );
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global ASM_PFX(__XenHypercall2)
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ASM_PFX(__XenHypercall2):
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push rdi
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push rsi
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; Copy HypercallAddr to rax
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mov rax, rcx
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; Copy Arg1 to the register expected by Xen
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mov rdi, rdx
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; Copy Arg2 to the register expected by Xen
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mov rsi, r8
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; Call HypercallAddr
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call rax
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pop rsi
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pop rdi
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ret
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63
OvmfPkg/Library/XenHypercallLib/XenHypercall.c
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63
OvmfPkg/Library/XenHypercallLib/XenHypercall.c
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/** @file
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Functions to make Xen hypercalls.
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Copyright (C) 2014, Citrix Ltd.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <IndustryStandard/Xen/hvm/params.h>
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#include <IndustryStandard/Xen/memory.h>
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#include <Library/DebugLib.h>
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#include <Library/XenHypercallLib.h>
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UINT64
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XenHypercallHvmGetParam (
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IN UINT32 Index
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)
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{
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xen_hvm_param_t Parameter;
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INTN Error;
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Parameter.domid = DOMID_SELF;
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Parameter.index = Index;
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Error = XenHypercall2 (__HYPERVISOR_hvm_op,
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HVMOP_get_param, (INTN) &Parameter);
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if (Error != 0) {
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DEBUG ((EFI_D_ERROR,
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"XenHypercall: Error %d trying to get HVM parameter %d\n",
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Error, Index));
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return 0;
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}
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return Parameter.value;
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}
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INTN
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XenHypercallMemoryOp (
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IN UINTN Operation,
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IN OUT VOID *Arguments
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)
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{
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return XenHypercall2 (__HYPERVISOR_memory_op,
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Operation, (INTN) Arguments);
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}
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INTN
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XenHypercallEventChannelOp (
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IN INTN Operation,
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IN OUT VOID *Arguments
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)
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{
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return XenHypercall2 (__HYPERVISOR_event_channel_op,
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Operation, (INTN) Arguments);
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}
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77
OvmfPkg/Library/XenHypercallLib/XenHypercallIntel.c
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OvmfPkg/Library/XenHypercallLib/XenHypercallIntel.c
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/** @file
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Xen Hypercall Library implementation for Intel architecture
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Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <Library/HobLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/XenInfo.h>
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STATIC VOID *HyperPage;
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//
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// Interface exposed by the ASM implementation of the core hypercall
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//
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INTN
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EFIAPI
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__XenHypercall2 (
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IN VOID *HypercallAddr,
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IN OUT INTN Arg1,
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IN OUT INTN Arg2
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);
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/**
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Library constructor: retrieves the Hyperpage address
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from the gEfiXenInfoGuid HOB
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**/
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RETURN_STATUS
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EFIAPI
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XenHypercallLibIntelInit (
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VOID
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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EFI_XEN_INFO *XenInfo;
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GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
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if (GuidHob == NULL) {
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return RETURN_NOT_FOUND;
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}
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XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
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HyperPage = XenInfo->HyperPages;
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return RETURN_SUCCESS;
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}
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/**
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This function will put the two arguments in the right place (registers) and
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invoke the hypercall identified by HypercallID.
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@param HypercallID The symbolic ID of the hypercall to be invoked
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@param Arg1 First argument.
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@param Arg2 Second argument.
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@return Return 0 if success otherwise it return an errno.
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**/
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INTN
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EFIAPI
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XenHypercall2 (
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IN UINTN HypercallID,
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IN OUT INTN Arg1,
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IN OUT INTN Arg2
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)
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{
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ASSERT (HyperPage != NULL);
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return __XenHypercall2 ((UINT8*)HyperPage + HypercallID * 32, Arg1, Arg2);
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}
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52
OvmfPkg/Library/XenHypercallLib/XenHypercallLibIntel.inf
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52
OvmfPkg/Library/XenHypercallLib/XenHypercallLibIntel.inf
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## @file
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# Xen Hypercall abstraction lib for Intel architecture
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#
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# Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = XenHypercallLibIntel
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FILE_GUID = B5EE9A32-CA5A-49A8-82E3-ADA4CCB77C7C
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MODULE_TYPE = BASE
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VERSION_STRING = 1.0
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LIBRARY_CLASS = XenHypercallLib|DXE_DRIVER UEFI_DRIVER
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CONSTRUCTOR = XenHypercallLibIntelInit
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64
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#
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[Sources]
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XenHypercallIntel.c
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[Sources.IA32]
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Ia32/hypercall.nasm
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[Sources.X64]
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X64/hypercall.nasm
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[Sources]
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XenHypercall.c
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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[LibraryClasses]
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BaseLib
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HobLib
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DebugLib
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[Guids]
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gEfiXenInfoGuid
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