bbc3758ab5
This refactors the Xen hypercall implementation that is part of the XenBusDxe driver, in preparation of splitting it off entirely into a XenHypercallLib library. This involves: - removing the dependency on XENBUS_DEVICE* pointers in the XenHypercall() prototypes - moving the discovered hyperpage address to a global variable - moving XenGetSharedInfoPage() to its only user XenBusDxe.c (the shared info page is not strictly part of the Xen hypercall interface, and is not used by other expected users of XenHypercallLib such as the Xen console version of SerialPortLib - reimplement XenHypercall2() in C and move the indexing of the hyperpage there; the existing asm implementations are renamed to __XenHypercall2() and invoked from the new C implementation. Contributed-under: TianoCore Contribution Agreement 1.0 Acked-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@16969 6f19259b-4bc3-4df7-8a09-765794883524
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/** @file
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Event Channel function implementation.
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Event channel are use to notify of an event that happend in a shared
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structure for example.
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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 "EventChannel.h"
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#include "XenHypercall.h"
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UINT32
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XenEventChannelNotify (
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IN XENBUS_DEVICE *Dev,
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IN evtchn_port_t Port
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)
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{
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INTN ReturnCode;
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evtchn_send_t Send;
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Send.port = Port;
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ReturnCode = XenHypercallEventChannelOp (EVTCHNOP_send, &Send);
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return (UINT32)ReturnCode;
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}
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UINT32
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EFIAPI
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XenBusEventChannelAllocate (
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IN XENBUS_PROTOCOL *This,
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IN domid_t DomainId,
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OUT evtchn_port_t *Port
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)
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{
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evtchn_alloc_unbound_t Parameter;
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UINT32 ReturnCode;
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Parameter.dom = DOMID_SELF;
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Parameter.remote_dom = DomainId;
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ReturnCode = (UINT32)XenHypercallEventChannelOp (
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EVTCHNOP_alloc_unbound,
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&Parameter);
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if (ReturnCode != 0) {
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DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
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return ReturnCode;
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}
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*Port = Parameter.port;
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return ReturnCode;
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}
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UINT32
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EFIAPI
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XenBusEventChannelNotify (
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IN XENBUS_PROTOCOL *This,
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IN evtchn_port_t Port
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)
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{
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XENBUS_PRIVATE_DATA *Private;
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Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
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return XenEventChannelNotify (Private->Dev, Port);
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}
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UINT32
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EFIAPI
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XenBusEventChannelClose (
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IN XENBUS_PROTOCOL *This,
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IN evtchn_port_t Port
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)
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{
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evtchn_close_t Close;
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Close.port = Port;
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return (UINT32)XenHypercallEventChannelOp (EVTCHNOP_close, &Close);
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}
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