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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/IoLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/QemuFwCfgLib.h>
#include <libfdt.h>
#include "QemuFwCfgLibMmioInternal.h"
/**
To get firmware configure selector address.
@param VOID
@retval firmware configure selector address
**/
UINTN
EFIAPI
QemuGetFwCfgSelectorAddress (
VOID
)
{
QEMU_FW_CFG_RESOURCE *FwCfgResource;
FwCfgResource = QemuGetFwCfgResourceHob ();
ASSERT (FwCfgResource != NULL);
return FwCfgResource->FwCfgSelectorAddress;
}
/**
To get firmware configure Data address.
@param VOID
@retval firmware configure data address
**/
UINTN
EFIAPI
QemuGetFwCfgDataAddress (
VOID
)
{
QEMU_FW_CFG_RESOURCE *FwCfgResource;
FwCfgResource = QemuGetFwCfgResourceHob ();
ASSERT (FwCfgResource != NULL);
return FwCfgResource->FwCfgDataAddress;
}
/**
To get firmware DMA address.
@param VOID
@retval firmware DMA address
**/
UINTN
EFIAPI
QemuGetFwCfgDmaAddress (
VOID
)
{
QEMU_FW_CFG_RESOURCE *FwCfgResource;
FwCfgResource = QemuGetFwCfgResourceHob ();
ASSERT (FwCfgResource != NULL);
return FwCfgResource->FwCfgDmaAddress;
}
RETURN_STATUS
EFIAPI
QemuFwCfgInitialize (
VOID
)
{
VOID *DeviceTreeBase;
INT32 Node;
INT32 Prev;
UINT32 Signature;
CONST CHAR8 *Type;
INT32 Len;
CONST UINT64 *Reg;
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) {
return RETURN_SUCCESS;
}
DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
ASSERT (DeviceTreeBase != NULL);
//
// Make sure we have a valid device tree blob
//
ASSERT (fdt_check_header (DeviceTreeBase) == 0);
//
// Create resouce memory
//
FwCfgResource = AllocateZeroPool (sizeof (QEMU_FW_CFG_RESOURCE));
ASSERT (FwCfgResource != NULL);
for (Prev = 0; ; Prev = Node) {
Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
if (Node < 0) {
break;
}
//
// Check for memory node
//
Type = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len);
if ((Type != NULL) &&
(AsciiStrnCmp (Type, "qemu,fw-cfg-mmio", Len) == 0))
{
//
// Get the 'reg' property of this node. For now, we will assume
// two 8 byte quantities for base and size, respectively.
//
Reg = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);
if ((Reg != 0) && (Len == (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);
FwCfgResource->FwCfgSelectorAddress = FwCfgSelectorAddress;
FwCfgResource->FwCfgDataAddress = 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));
FwCfgResource->FwCfgDmaAddress = FwCfgDmaAddress;
} else {
FwCfgDmaAddress = 0;
}
if ((FwCfgSelectorAddress != 0) && (FwCfgDataAddress != 0)) {
//
// Select Item Signature
//
MmioWrite16 (FwCfgSelectorAddress, SwapBytes16 ((UINT16)QemuFwCfgItemSignature));
//
// Readout the Signature.
//
Signature = MmioRead32 (FwCfgDataAddress);
if (Signature == SIGNATURE_32 ('Q', 'E', 'M', 'U')) {
//
// Build the firmware configure resource HOB.
//
QemuBuildFwCfgResourceHob (FwCfgResource);
} else {
FwCfgResource->FwCfgDataAddress = 0;
FwCfgResource->FwCfgSelectorAddress = 0;
FwCfgResource->FwCfgDmaAddress = 0;
DEBUG ((
DEBUG_ERROR,
"%a: Signature dose not match QEMU!\n",
__func__
));
break;
}
}
break;
} else {
DEBUG ((
DEBUG_ERROR,
"%a: Failed to parse FDT QemuCfg node\n",
__func__
));
break;
}
}
}
return RETURN_SUCCESS;
}
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