mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-11 14:28:08 +01:00
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/** @file
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Copyright (c) 2014-2018, Linaro Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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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/UefiBootServicesTableLib.h>
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#include <Library/VirtNorFlashPlatformLib.h>
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#include <Protocol/FdtClient.h>
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#define QEMU_NOR_BLOCK_SIZE SIZE_256KB
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#define MAX_FLASH_BANKS 4
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EFI_STATUS
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VirtNorFlashPlatformInitialization (
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VOID
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)
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{
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return EFI_SUCCESS;
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}
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STATIC VIRT_NOR_FLASH_DESCRIPTION mNorFlashDevices[MAX_FLASH_BANKS];
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EFI_STATUS
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VirtNorFlashPlatformGetDevices (
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OUT VIRT_NOR_FLASH_DESCRIPTION **NorFlashDescriptions,
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OUT UINT32 *Count
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)
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{
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FDT_CLIENT_PROTOCOL *FdtClient;
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INT32 Node;
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EFI_STATUS Status;
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EFI_STATUS FindNodeStatus;
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CONST UINT32 *Reg;
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UINT32 PropSize;
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UINT32 Num;
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UINT64 Base;
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UINT64 Size;
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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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Num = 0;
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for (FindNodeStatus = FdtClient->FindCompatibleNode (
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FdtClient,
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"cfi-flash",
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&Node
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);
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!EFI_ERROR (FindNodeStatus) && Num < MAX_FLASH_BANKS;
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FindNodeStatus = FdtClient->FindNextCompatibleNode (
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FdtClient,
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"cfi-flash",
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Node,
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&Node
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))
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{
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Status = FdtClient->GetNodeProperty (
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FdtClient,
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Node,
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"reg",
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(CONST VOID **)&Reg,
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&PropSize
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_ERROR,
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"%a: GetNodeProperty () failed (Status == %r)\n",
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__FUNCTION__,
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Status
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));
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continue;
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}
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ASSERT ((PropSize % (4 * sizeof (UINT32))) == 0);
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while (PropSize >= (4 * sizeof (UINT32)) && Num < MAX_FLASH_BANKS) {
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Base = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[0]));
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Size = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[2]));
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Reg += 4;
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PropSize -= 4 * sizeof (UINT32);
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//
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// Disregard any flash devices that overlap with the primary FV.
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// The firmware is not updatable from inside the guest anyway.
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//
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if ((PcdGet64 (PcdFvBaseAddress) + PcdGet32 (PcdFvSize) > Base) &&
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((Base + Size) > PcdGet64 (PcdFvBaseAddress)))
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{
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continue;
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}
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mNorFlashDevices[Num].DeviceBaseAddress = (UINTN)Base;
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mNorFlashDevices[Num].RegionBaseAddress = (UINTN)Base;
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mNorFlashDevices[Num].Size = (UINTN)Size;
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mNorFlashDevices[Num].BlockSize = QEMU_NOR_BLOCK_SIZE;
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Num++;
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}
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//
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// UEFI takes ownership of the NOR flash, and exposes its functionality
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// through the UEFI Runtime Services GetVariable, SetVariable, etc. This
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// means we need to disable it in the device tree to prevent the OS from
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// attaching its device driver as well.
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// Note that this also hides other flash banks, but the only other flash
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// bank we expect to encounter is the one that carries the UEFI executable
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// code, which is not intended to be guest updatable, and is usually backed
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// in a readonly manner by QEMU anyway.
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//
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Status = FdtClient->SetNodeProperty (
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FdtClient,
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Node,
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"status",
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"disabled",
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sizeof ("disabled")
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_WARN, "Failed to set NOR flash status to 'disabled'\n"));
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}
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}
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*NorFlashDescriptions = mNorFlashDevices;
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*Count = Num;
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return EFI_SUCCESS;
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}
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