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/** @file
OVMF ACPI QEMU support
Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2012-2014, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/PcdLib.h>
#include <Library/OrderedCollectionLib.h>
#include <Library/TdxLib.h>
#include <IndustryStandard/Acpi.h>
#include <Protocol/AcpiSystemDescriptionTable.h>
#include <Protocol/AcpiTable.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/TdxMailboxLib.h>
#include <Protocol/Cpu.h>
#include <Uefi.h>
#include <TdxAcpiTable.h>
/**
At the beginning of system boot, a 4K-aligned, 4K-size memory (Td mailbox) is
pre-allocated by host VMM. BSP & APs do the page accept together in that memory
region.
After that TDVF is designed to relocate the mailbox to a 4K-aligned, 4K-size
memory block which is allocated in the ACPI Nvs memory. APs are waken up and
spin around the relocated mailbox for further command.
@return EFI_PHYSICAL_ADDRESS Address of the relocated mailbox
**/
EFI_PHYSICAL_ADDRESS
EFIAPI
RelocateMailbox (
VOID
)
{
EFI_PHYSICAL_ADDRESS Address;
VOID *ApLoopFunc;
UINT32 RelocationPages;
MP_RELOCATION_MAP RelocationMap;
MP_WAKEUP_MAILBOX *RelocatedMailBox;
EFI_STATUS Status;
Address = 0;
ApLoopFunc = NULL;
ZeroMem (&RelocationMap, sizeof (RelocationMap));
//
// Get information needed to setup aps running in their
// run loop in allocated acpi reserved memory
// Add another page for mailbox
//
AsmGetRelocationMap (&RelocationMap);
if ((RelocationMap.RelocateApLoopFuncAddress == 0) || (RelocationMap.RelocateApLoopFuncSize == 0)) {
DEBUG ((DEBUG_ERROR, "Failed to get the RelocationMap.\n"));
return 0;
}
RelocationPages = EFI_SIZE_TO_PAGES ((UINT32)RelocationMap.RelocateApLoopFuncSize) + 1;
Status = gBS->AllocatePages (AllocateAnyPages, EfiACPIMemoryNVS, RelocationPages, &Address);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Failed to allocate pages for MailboxRelocation. %r\n", Status));
return 0;
}
ZeroMem ((VOID *)Address, EFI_PAGES_TO_SIZE (RelocationPages));
ApLoopFunc = (VOID *)((UINTN)Address + EFI_PAGE_SIZE);
CopyMem (
ApLoopFunc,
RelocationMap.RelocateApLoopFuncAddress,
RelocationMap.RelocateApLoopFuncSize
);
DEBUG ((
DEBUG_INFO,
"Ap Relocation: mailbox %llx, loop %p\n",
Address,
ApLoopFunc
));
//
// Initialize mailbox
//
RelocatedMailBox = (MP_WAKEUP_MAILBOX *)Address;
RelocatedMailBox->Command = MpProtectedModeWakeupCommandNoop;
RelocatedMailBox->ApicId = MP_CPU_PROTECTED_MODE_MAILBOX_APICID_INVALID;
RelocatedMailBox->WakeUpVector = 0;
//
// Wakup APs and have been move to the finalized run loop
// They will spin until guest OS wakes them
//
MpSerializeStart ();
MpSendWakeupCommand (
MpProtectedModeWakeupCommandWakeup,
(UINT64)ApLoopFunc,
(UINT64)RelocatedMailBox,
0,
0,
0
);
return Address;
}
/**
Alter the MADT when ACPI Table from QEMU is available.
@param[in] Event Event whose notification function is being invoked
@param[in] Context Pointer to the notification function's context
**/
VOID
EFIAPI
AlterAcpiTable (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_ACPI_SDT_PROTOCOL *AcpiSdtProtocol;
EFI_ACPI_TABLE_PROTOCOL *AcpiTableProtocol;
EFI_STATUS Status;
UINTN Index;
EFI_ACPI_SDT_HEADER *Table;
EFI_ACPI_TABLE_VERSION Version;
UINTN OriginalTableKey;
UINTN NewTableKey;
UINT8 *NewMadtTable;
UINTN NewMadtTableLength;
EFI_PHYSICAL_ADDRESS RelocateMailboxAddress;
EFI_ACPI_6_4_MULTIPROCESSOR_WAKEUP_STRUCTURE *MadtMpWk;
EFI_ACPI_1_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER *MadtHeader;
Index = 0;
NewMadtTable = NULL;
MadtHeader = NULL;
Status = gBS->LocateProtocol (&gEfiAcpiSdtProtocolGuid, NULL, (void **)&AcpiSdtProtocol);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Unable to locate ACPI SDT protocol.\n"));
return;
}
RelocateMailboxAddress = RelocateMailbox ();
if (RelocateMailboxAddress == 0) {
ASSERT (FALSE);
DEBUG ((DEBUG_ERROR, "Failed to relocate Td mailbox\n"));
return;
}
do {
Status = AcpiSdtProtocol->GetAcpiTable (Index, &Table, &Version, &OriginalTableKey);
if (!EFI_ERROR (Status) && (Table->Signature == EFI_ACPI_1_0_APIC_SIGNATURE)) {
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (void **)&AcpiTableProtocol);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Unable to locate ACPI Table protocol.\n"));
break;
}
NewMadtTableLength = Table->Length + sizeof (EFI_ACPI_6_4_MULTIPROCESSOR_WAKEUP_STRUCTURE);
NewMadtTable = AllocatePool (NewMadtTableLength);
if (NewMadtTable == NULL) {
DEBUG ((DEBUG_ERROR, "%a: OUT_OF_SOURCES error.\n", __func__));
break;
}
CopyMem (NewMadtTable, (UINT8 *)Table, Table->Length);
MadtHeader = (EFI_ACPI_1_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER *)NewMadtTable;
MadtHeader->Header.Length = (UINT32)NewMadtTableLength;
MadtMpWk = (EFI_ACPI_6_4_MULTIPROCESSOR_WAKEUP_STRUCTURE *)(NewMadtTable + Table->Length);
MadtMpWk->Type = EFI_ACPI_6_4_MULTIPROCESSOR_WAKEUP;
MadtMpWk->Length = sizeof (EFI_ACPI_6_4_MULTIPROCESSOR_WAKEUP_STRUCTURE);
MadtMpWk->MailBoxVersion = 1;
MadtMpWk->Reserved = 0;
MadtMpWk->MailBoxAddress = RelocateMailboxAddress;
Status = AcpiTableProtocol->InstallAcpiTable (AcpiTableProtocol, NewMadtTable, NewMadtTableLength, &NewTableKey);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Failed to install new MADT table. %r\n", Status));
break;
}
Status = AcpiTableProtocol->UninstallAcpiTable (AcpiTableProtocol, OriginalTableKey);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Uninstall old MADT table error.\n"));
}
break;
}
Index++;
} while (!EFI_ERROR (Status));
if (NewMadtTable != NULL) {
FreePool (NewMadtTable);
}
}
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