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