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/** @file
Stateful and implicitly initialized fw_cfg library implementation.
Copyright (C) 2013 - 2014, Red Hat, Inc.
Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/FdtClient.h>
#include "QemuFwCfgLibMmioInternal.h"
STATIC UINTN mFwCfgSelectorAddress;
STATIC UINTN mFwCfgDataAddress;
STATIC UINTN mFwCfgDmaAddress;
/**
To get firmware configure selector address.
@param VOID
@retval firmware configure selector address
**/
UINTN
EFIAPI
QemuGetFwCfgSelectorAddress (
VOID
)
{
return mFwCfgSelectorAddress;
}
/**
To get firmware configure Data address.
@param VOID
@retval firmware configure data address
**/
UINTN
EFIAPI
QemuGetFwCfgDataAddress (
VOID
)
{
return mFwCfgDataAddress;
}
/**
To get firmware DMA address.
@param VOID
@retval firmware DMA address
**/
UINTN
EFIAPI
QemuGetFwCfgDmaAddress (
VOID
)
{
return mFwCfgDmaAddress;
}
RETURN_STATUS
EFIAPI
QemuFwCfgInitialize (
VOID
)
{
EFI_STATUS Status;
FDT_CLIENT_PROTOCOL *FdtClient;
CONST UINT64 *Reg;
UINT32 RegSize;
UINTN AddressCells, SizeCells;
UINT64 FwCfgSelectorAddress;
UINT64 FwCfgSelectorSize;
UINT64 FwCfgDataAddress;
UINT64 FwCfgDataSize;
UINT64 FwCfgDmaAddress;
UINT64 FwCfgDmaSize;
QEMU_FW_CFG_RESOURCE *FwCfgResource;
//
// Check whether the Qemu firmware configure resources HOB has been created,
// if so use the resources in the HOB.
//
FwCfgResource = QemuGetFwCfgResourceHob ();
if (FwCfgResource != NULL) {
mFwCfgSelectorAddress = FwCfgResource->FwCfgSelectorAddress;
mFwCfgDataAddress = FwCfgResource->FwCfgDataAddress;
mFwCfgDmaAddress = FwCfgResource->FwCfgDmaAddress;
if (mFwCfgDmaAddress != 0) {
InternalQemuFwCfgReadBytes = DmaReadBytes;
InternalQemuFwCfgWriteBytes = DmaWriteBytes;
InternalQemuFwCfgSkipBytes = DmaSkipBytes;
}
return RETURN_SUCCESS;
}
Status = gBS->LocateProtocol (
&gFdtClientProtocolGuid,
NULL,
(VOID **)&FdtClient
);
ASSERT_EFI_ERROR (Status);
Status = FdtClient->FindCompatibleNodeReg (
FdtClient,
"qemu,fw-cfg-mmio",
(CONST VOID **)&Reg,
&AddressCells,
&SizeCells,
&RegSize
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_WARN,
"%a: No 'qemu,fw-cfg-mmio' compatible DT node found (Status == %r)\n",
__func__,
Status
));
return EFI_SUCCESS;
}
ASSERT (AddressCells == 2);
ASSERT (SizeCells == 2);
ASSERT (RegSize == 2 * sizeof (UINT64));
FwCfgDataAddress = SwapBytes64 (Reg[0]);
FwCfgDataSize = 8;
FwCfgSelectorAddress = FwCfgDataAddress + FwCfgDataSize;
FwCfgSelectorSize = 2;
//
// The following ASSERT()s express
//
// Address + Size - 1 <= MAX_UINTN
//
// for both registers, that is, that the last byte in each MMIO range is
// expressible as a MAX_UINTN. The form below is mathematically
// equivalent, and it also prevents any unsigned overflow before the
// comparison.
//
ASSERT (FwCfgSelectorAddress <= MAX_UINTN - FwCfgSelectorSize + 1);
ASSERT (FwCfgDataAddress <= MAX_UINTN - FwCfgDataSize + 1);
mFwCfgSelectorAddress = FwCfgSelectorAddress;
mFwCfgDataAddress = FwCfgDataAddress;
DEBUG ((
DEBUG_INFO,
"Found FwCfg @ 0x%Lx/0x%Lx\n",
FwCfgSelectorAddress,
FwCfgDataAddress
));
if (SwapBytes64 (Reg[1]) >= 0x18) {
FwCfgDmaAddress = FwCfgDataAddress + 0x10;
FwCfgDmaSize = 0x08;
//
// See explanation above.
//
ASSERT (FwCfgDmaAddress <= MAX_UINTN - FwCfgDmaSize + 1);
DEBUG ((DEBUG_INFO, "Found FwCfg DMA @ 0x%Lx\n", FwCfgDmaAddress));
} else {
FwCfgDmaAddress = 0;
}
if (QemuFwCfgIsAvailable ()) {
UINT32 Signature;
QemuFwCfgSelectItem (QemuFwCfgItemSignature);
Signature = QemuFwCfgRead32 ();
if (Signature == SIGNATURE_32 ('Q', 'E', 'M', 'U')) {
//
// For DMA support, we require the DTB to advertise the register, and the
// feature bitmap (which we read without DMA) to confirm the feature.
//
if (FwCfgDmaAddress != 0) {
UINT32 Features;
QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);
Features = QemuFwCfgRead32 ();
if ((Features & FW_CFG_F_DMA) != 0) {
mFwCfgDmaAddress = FwCfgDmaAddress;
InternalQemuFwCfgReadBytes = DmaReadBytes;
InternalQemuFwCfgWriteBytes = DmaWriteBytes;
InternalQemuFwCfgSkipBytes = DmaSkipBytes;
}
}
} else {
mFwCfgSelectorAddress = 0;
mFwCfgDataAddress = 0;
}
}
return RETURN_SUCCESS;
}
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