mirror of https://github.com/acidanthera/audk.git
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/** @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 <Library/HobLib.h>
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#include <Guid/XenInfo.h>
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#include "XenBusDxe.h"
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#include "XenHypercall.h"
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#include <IndustryStandard/Xen/hvm/params.h>
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#include <IndustryStandard/Xen/memory.h>
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EFI_STATUS
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XenHyperpageInit (
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IN OUT XENBUS_DEVICE *Dev
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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 EFI_NOT_FOUND;
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}
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XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
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Dev->Hyperpage = XenInfo->HyperPages;
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return EFI_SUCCESS;
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}
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UINT64
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XenHypercallHvmGetParam (
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IN XENBUS_DEVICE *Dev,
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IN INTN 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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ASSERT (Dev->Hyperpage != NULL);
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Parameter.domid = DOMID_SELF;
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Parameter.index = Index;
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Error = XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_hvm_op * 32,
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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 XENBUS_DEVICE *Dev,
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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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ASSERT (Dev->Hyperpage != NULL);
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return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_memory_op * 32,
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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 XENBUS_DEVICE *Dev,
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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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ASSERT (Dev->Hyperpage != NULL);
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return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_event_channel_op * 32,
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Operation, (INTN) Arguments);
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}
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EFI_STATUS
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XenGetSharedInfoPage (
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IN OUT XENBUS_DEVICE *Dev
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)
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{
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xen_add_to_physmap_t Parameter;
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ASSERT (Dev->SharedInfo == NULL);
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Parameter.domid = DOMID_SELF;
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Parameter.space = XENMAPSPACE_shared_info;
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Parameter.idx = 0;
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//
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// using reserved page because the page is not released when Linux is
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// starting because of the add_to_physmap. QEMU might try to access the
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// page, and fail because it have no right to do so (segv).
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//
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Dev->SharedInfo = AllocateReservedPages (1);
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Parameter.gpfn = (UINTN) Dev->SharedInfo >> EFI_PAGE_SHIFT;
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if (XenHypercallMemoryOp (Dev, XENMEM_add_to_physmap, &Parameter) != 0) {
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FreePages (Dev->SharedInfo, 1);
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Dev->SharedInfo = NULL;
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return EFI_LOAD_ERROR;
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}
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return EFI_SUCCESS;
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}
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