/** @file
This is the implementation to save ACPI S3 Context.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/HobLib.h>
#include <Library/LockBoxLib.h>
#include <Library/PcdLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Guid/AcpiS3Context.h>
#include <IndustryStandard/Acpi.h>
#include <Protocol/LockBox.h>
//
// 8 extra pages for PF handler.
//
#define EXTRA_PAGE_TABLE_PAGES 8
EFI_GUID mAcpiS3IdtrProfileGuid = {
0xdea652b0, 0xd587, 0x4c54, { 0xb5, 0xb4, 0xc6, 0x82, 0xe7, 0xa0, 0xaa, 0x3d }
};
/**
Allocate memory below 4G memory address.
This function allocates memory below 4G memory address.
@param MemoryType Memory type of memory to allocate.
@param Size Size of memory to allocate.
@return Allocated address for output.
**/
VOID*
AllocateMemoryBelow4G (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Size
)
{
UINTN Pages;
EFI_PHYSICAL_ADDRESS Address;
EFI_STATUS Status;
VOID* Buffer;
Pages = EFI_SIZE_TO_PAGES (Size);
Address = 0xffffffff;
Status = gBS->AllocatePages (
AllocateMaxAddress,
MemoryType,
Pages,
&Address
);
ASSERT_EFI_ERROR (Status);
Buffer = (VOID *) (UINTN) Address;
ZeroMem (Buffer, Size);
return Buffer;
}
/**
The function will check if long mode waking vector is supported.
@param[in] Facs Pointer to FACS table.
@retval TRUE Long mode waking vector is supported.
@retval FALSE Long mode waking vector is not supported.
**/
BOOLEAN
IsLongModeWakingVectorSupport (
IN EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs
)
{
if ((Facs == NULL) ||
(Facs->Signature != EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE) ) {
//
// Something wrong with FACS.
//
return FALSE;
}
if ((Facs->Version == EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_VERSION) &&
((Facs->Flags & EFI_ACPI_4_0_64BIT_WAKE_SUPPORTED_F) != 0)) {
//
// BIOS supports 64bit waking vector.
//
if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {
return TRUE;
}
}
return FALSE;
}
/**
Allocates page table buffer.
@param[in] LongModeWakingVectorSupport Support long mode waking vector or not.
If BootScriptExector driver will run in 64-bit mode, this function will establish the 1:1
virtual to physical mapping page table when long mode waking vector is supported, otherwise
create 4G page table when long mode waking vector is not supported and let PF handler to
handle > 4G request.
If BootScriptExector driver will not run in 64-bit mode, this function will do nothing.
@return Page table base address.
**/
EFI_PHYSICAL_ADDRESS
S3AllocatePageTablesBuffer (
IN BOOLEAN LongModeWakingVectorSupport
)
{
if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {
UINTN ExtraPageTablePages;
UINT32 RegEax;
UINT32 RegEdx;
UINT8 PhysicalAddressBits;
UINT32 NumberOfPml4EntriesNeeded;
UINT32 NumberOfPdpEntriesNeeded;
EFI_PHYSICAL_ADDRESS S3NvsPageTableAddress;
UINTN TotalPageTableSize;
VOID *Hob;
BOOLEAN Page1GSupport;
Page1GSupport = FALSE;
if (PcdGetBool(PcdUse1GPageTable)) {
AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
if (RegEax >= 0x80000001) {
AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);
if ((RegEdx & BIT26) != 0) {
Page1GSupport = TRUE;
}
}
}
//
// Get physical address bits supported.
//
Hob = GetFirstHob (EFI_HOB_TYPE_CPU);
if (Hob != NULL) {
PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;
} else {
AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
if (RegEax >= 0x80000008) {
AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
PhysicalAddressBits = (UINT8) RegEax;
} else {
PhysicalAddressBits = 36;
}
}
//
// IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.
//
ASSERT (PhysicalAddressBits <= 52);
if (PhysicalAddressBits > 48) {
PhysicalAddressBits = 48;
}
ExtraPageTablePages = 0;
if (!LongModeWakingVectorSupport) {
//
// Create 4G page table when BIOS does not support long mode waking vector,
// and let PF handler to handle > 4G request.
//
PhysicalAddressBits = 32;
ExtraPageTablePages = EXTRA_PAGE_TABLE_PAGES;
}
//
// Calculate the table entries needed.
//
if (PhysicalAddressBits <= 39 ) {
NumberOfPml4EntriesNeeded = 1;
NumberOfPdpEntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 30));
} else {
NumberOfPml4EntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 39));
NumberOfPdpEntriesNeeded = 512;
}
//
// We need calculate whole page size then allocate once, because S3 restore page table does not know each page in Nvs.
//
if (!Page1GSupport) {
TotalPageTableSize = 1 + NumberOfPml4EntriesNeeded + NumberOfPml4EntriesNeeded * NumberOfPdpEntriesNeeded;
} else {
TotalPageTableSize = 1 + NumberOfPml4EntriesNeeded;
}
TotalPageTableSize += ExtraPageTablePages;
DEBUG ((DEBUG_INFO, "AcpiS3ContextSave TotalPageTableSize - 0x%x pages\n", TotalPageTableSize));
//
// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
//
S3NvsPageTableAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGES_TO_SIZE(TotalPageTableSize));
ASSERT (S3NvsPageTableAddress != 0);
return S3NvsPageTableAddress;
} else {
//
// If DXE is running 32-bit mode, no need to establish page table.
//
return (EFI_PHYSICAL_ADDRESS) 0;
}
}
/**
Callback function executed when the EndOfDxe event group is signaled.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context The pointer to the notification function's context, which
is implementation-dependent.
**/
VOID
EFIAPI
AcpiS3ContextSaveOnEndOfDxe (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS AcpiS3ContextBuffer;
ACPI_S3_CONTEXT *AcpiS3Context;
IA32_DESCRIPTOR *Idtr;
IA32_IDT_GATE_DESCRIPTOR *IdtGate;
EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
VOID *Interface;
DEBUG ((EFI_D_INFO, "AcpiS3ContextSave!\n"));
Status = gBS->LocateProtocol (&gEfiLockBoxProtocolGuid, NULL, &Interface);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_INFO | EFI_D_WARN, "ACPI S3 context can't be saved without LockBox!\n"));
goto Done;
}
AcpiS3Context = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(*AcpiS3Context));
ASSERT (AcpiS3Context != NULL);
AcpiS3ContextBuffer = (EFI_PHYSICAL_ADDRESS)(UINTN)AcpiS3Context;
//
// Get ACPI Table because we will save its position to variable
//
Facs = (EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *) EfiLocateFirstAcpiTable (
EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE
);
AcpiS3Context->AcpiFacsTable = (EFI_PHYSICAL_ADDRESS) (UINTN) Facs;
ASSERT (AcpiS3Context->AcpiFacsTable != 0);
IdtGate = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 + sizeof(IA32_DESCRIPTOR));
Idtr = (IA32_DESCRIPTOR *)(IdtGate + 0x100);
Idtr->Base = (UINTN)IdtGate;
Idtr->Limit = (UINT16)(sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 - 1);
AcpiS3Context->IdtrProfile = (EFI_PHYSICAL_ADDRESS)(UINTN)Idtr;
Status = SaveLockBox (
&mAcpiS3IdtrProfileGuid,
(VOID *)(UINTN)Idtr,
(UINTN)sizeof(IA32_DESCRIPTOR)
);
ASSERT_EFI_ERROR (Status);
Status = SetLockBoxAttributes (&mAcpiS3IdtrProfileGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);
ASSERT_EFI_ERROR (Status);
//
// Allocate page table
//
AcpiS3Context->S3NvsPageTableAddress = S3AllocatePageTablesBuffer (IsLongModeWakingVectorSupport (Facs));
//
// Allocate stack
//
AcpiS3Context->BootScriptStackSize = PcdGet32 (PcdS3BootScriptStackSize);
AcpiS3Context->BootScriptStackBase = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, PcdGet32 (PcdS3BootScriptStackSize));
ASSERT (AcpiS3Context->BootScriptStackBase != 0);
//
// Allocate a code buffer < 4G for S3 debug to load external code, set invalid code instructions in it.
//
AcpiS3Context->S3DebugBufferAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGE_SIZE);
SetMem ((VOID *)(UINTN)AcpiS3Context->S3DebugBufferAddress, EFI_PAGE_SIZE, 0xff);
DEBUG((EFI_D_INFO, "AcpiS3Context: AcpiFacsTable is 0x%8x\n", AcpiS3Context->AcpiFacsTable));
DEBUG((EFI_D_INFO, "AcpiS3Context: IdtrProfile is 0x%8x\n", AcpiS3Context->IdtrProfile));
DEBUG((EFI_D_INFO, "AcpiS3Context: S3NvsPageTableAddress is 0x%8x\n", AcpiS3Context->S3NvsPageTableAddress));
DEBUG((EFI_D_INFO, "AcpiS3Context: S3DebugBufferAddress is 0x%8x\n", AcpiS3Context->S3DebugBufferAddress));
DEBUG((EFI_D_INFO, "AcpiS3Context: BootScriptStackBase is 0x%8x\n", AcpiS3Context->BootScriptStackBase));
DEBUG((EFI_D_INFO, "AcpiS3Context: BootScriptStackSize is 0x%8x\n", AcpiS3Context->BootScriptStackSize));
Status = SaveLockBox (
&gEfiAcpiVariableGuid,
&AcpiS3ContextBuffer,
sizeof(AcpiS3ContextBuffer)
);
ASSERT_EFI_ERROR (Status);
Status = SaveLockBox (
&gEfiAcpiS3ContextGuid,
(VOID *)(UINTN)AcpiS3Context,
(UINTN)sizeof(*AcpiS3Context)
);
ASSERT_EFI_ERROR (Status);
Status = SetLockBoxAttributes (&gEfiAcpiS3ContextGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);
ASSERT_EFI_ERROR (Status);
Done:
//
// Close the event, deregistering the callback and freeing resources.
//
Status = gBS->CloseEvent (Event);
ASSERT_EFI_ERROR (Status);
}