/** @file
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Driver for the XenIo protocol
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This driver simply allocate space for the grant tables.
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Copyright (c) 2019, Citrix Systems, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/XenIoMmioLib.h>
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#include <Library/XenPlatformLib.h>
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EFI_STATUS
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EFIAPI
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InitializeXenIoPvhDxe (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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VOID *Allocation;
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EFI_STATUS Status;
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EFI_HANDLE XenIoHandle;
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Allocation = NULL;
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XenIoHandle = NULL;
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if (!XenPvhDetected ()) {
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return EFI_UNSUPPORTED;
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}
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Allocation = AllocateReservedPages (FixedPcdGet32 (PcdXenGrantFrames));
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if (Allocation == NULL) {
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Status = EFI_OUT_OF_RESOURCES;
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goto Error;
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}
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Status = XenIoMmioInstall (&XenIoHandle, (UINTN) Allocation);
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if (EFI_ERROR (Status)) {
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goto Error;
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}
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return EFI_SUCCESS;
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Error:
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if (Allocation != NULL) {
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FreePages (Allocation, FixedPcdGet32 (PcdXenGrantFrames));
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}
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return Status;
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}
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