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/** @file
Functions to make Xen hypercalls.
Copyright (C) 2014, Citrix Ltd.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <IndustryStandard/Xen/hvm/params.h>
#include <IndustryStandard/Xen/memory.h>
#include <Library/DebugLib.h>
#include <Library/XenHypercallLib.h>
RETURN_STATUS
EFIAPI
XenHypercallLibConstruct (
VOID
)
{
XenHypercallLibInit ();
//
// We don't fail library construction, since that has catastrophic
// consequences for client modules (whereas those modules may easily be
// running on a non-Xen platform). Instead, XenHypercallIsAvailable()
// will return FALSE.
//
return RETURN_SUCCESS;
}
UINT64
EFIAPI
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 ((
DEBUG_ERROR,
"XenHypercall: Error %Ld trying to get HVM parameter %d\n",
(INT64)Error,
Index
));
return 0;
}
return Parameter.value;
}
INTN
EFIAPI
XenHypercallMemoryOp (
IN UINTN Operation,
IN OUT VOID *Arguments
)
{
return XenHypercall2 (
__HYPERVISOR_memory_op,
Operation,
(INTN)Arguments
);
}
INTN
EFIAPI
XenHypercallEventChannelOp (
IN INTN Operation,
IN OUT VOID *Arguments
)
{
return XenHypercall2 (
__HYPERVISOR_event_channel_op,
Operation,
(INTN)Arguments
);
}
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