mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
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/** @file
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* Xenio FDT client protocol driver for xen,xen DT node
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*
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* Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/XenIoMmioLib.h>
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#include <Protocol/FdtClient.h>
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EFI_STATUS
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EFIAPI
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InitializeXenioFdtDxe (
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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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EFI_STATUS Status;
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FDT_CLIENT_PROTOCOL *FdtClient;
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CONST UINT64 *Reg;
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UINT32 RegSize;
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UINTN AddressCells, SizeCells;
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EFI_HANDLE Handle;
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UINT64 RegBase;
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Status = gBS->LocateProtocol (
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&gFdtClientProtocolGuid,
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NULL,
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(VOID **)&FdtClient
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);
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ASSERT_EFI_ERROR (Status);
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Status = FdtClient->FindCompatibleNodeReg (
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FdtClient,
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"xen,xen",
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(CONST VOID **)&Reg,
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&AddressCells,
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&SizeCells,
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&RegSize
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_WARN,
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"%a: No 'xen,xen' compatible DT node found\n",
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__FUNCTION__
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));
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return EFI_UNSUPPORTED;
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}
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ASSERT (AddressCells == 2);
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ASSERT (SizeCells == 2);
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ASSERT (RegSize == 2 * sizeof (UINT64));
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//
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// Retrieve the reg base from this node and wire it up to the
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// MMIO flavor of the XenBus root device I/O protocol
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//
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RegBase = SwapBytes64 (Reg[0]);
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Handle = NULL;
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Status = XenIoMmioInstall (&Handle, RegBase);
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if (EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_ERROR,
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"%a: XenIoMmioInstall () failed on a new handle "
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"(Status == %r)\n",
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__FUNCTION__,
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Status
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));
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return Status;
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}
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DEBUG ((DEBUG_INFO, "Found Xen node with Grant table @ 0x%Lx\n", RegBase));
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return EFI_SUCCESS;
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}
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