16f6922709
There are cases that the operands of an expression are all with rank less
than UINT64/INT64 and the result of the expression is explicitly cast to
UINT64/INT64 to fit the target size.
An example will be:
UINT32 a,b;
// a and b can be any unsigned int type with rank less than UINT64, like
// UINT8, UINT16, etc.
UINT64 c;
c = (UINT64) (a + b);
Some static code checkers may warn that the expression result might
overflow within the rank of "int" (integer promotions) and the result is
then cast to a bigger size.
The commit refines codes by the following rules:
1). When the expression is possible to overflow the range of unsigned int/
int:
c = (UINT64)a + b;
2). When the expression will not overflow within the rank of "int", remove
the explicit type casts:
c = a + b;
3). When the expression will be cast to pointer of possible greater size:
UINT32 a,b;
VOID *c;
c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b);
4). When one side of a comparison expression contains only operands with
rank less than UINT32:
UINT8 a;
UINT16 b;
UINTN c;
if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...}
For rule 4), if we remove the 'UINTN' type cast like:
if (a + b > c) {...}
The VS compiler will complain with warning C4018 (signed/unsigned
mismatch, level 3 warning) due to promoting 'a + b' to type 'int'.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
533 lines
16 KiB
C
533 lines
16 KiB
C
/** @file
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This is the implementation to save ACPI S3 Context.
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Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions
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of the BSD License which accompanies this distribution. The
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full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/HobLib.h>
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#include <Library/LockBoxLib.h>
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#include <Library/PcdLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/AcpiS3Context.h>
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#include <Guid/Acpi.h>
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#include <IndustryStandard/Acpi.h>
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#include <Protocol/LockBox.h>
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//
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// 8 extra pages for PF handler.
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//
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#define EXTRA_PAGE_TABLE_PAGES 8
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EFI_GUID mAcpiS3IdtrProfileGuid = {
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0xdea652b0, 0xd587, 0x4c54, { 0xb5, 0xb4, 0xc6, 0x82, 0xe7, 0xa0, 0xaa, 0x3d }
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};
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/**
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Allocate memory below 4G memory address.
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This function allocates memory below 4G memory address.
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@param MemoryType Memory type of memory to allocate.
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@param Size Size of memory to allocate.
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@return Allocated address for output.
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**/
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VOID*
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AllocateMemoryBelow4G (
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IN EFI_MEMORY_TYPE MemoryType,
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IN UINTN Size
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)
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{
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UINTN Pages;
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EFI_PHYSICAL_ADDRESS Address;
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EFI_STATUS Status;
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VOID* Buffer;
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Pages = EFI_SIZE_TO_PAGES (Size);
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Address = 0xffffffff;
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Status = gBS->AllocatePages (
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AllocateMaxAddress,
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MemoryType,
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Pages,
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&Address
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);
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ASSERT_EFI_ERROR (Status);
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Buffer = (VOID *) (UINTN) Address;
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ZeroMem (Buffer, Size);
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return Buffer;
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}
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/**
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This function scan ACPI table in RSDT.
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@param Rsdt ACPI RSDT
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@param Signature ACPI table signature
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@return ACPI table
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**/
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VOID *
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ScanTableInRSDT (
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IN EFI_ACPI_DESCRIPTION_HEADER *Rsdt,
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IN UINT32 Signature
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)
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{
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UINTN Index;
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UINT32 EntryCount;
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UINT32 *EntryPtr;
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EFI_ACPI_DESCRIPTION_HEADER *Table;
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if (Rsdt == NULL) {
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return NULL;
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}
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EntryCount = (Rsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT32);
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EntryPtr = (UINT32 *)(Rsdt + 1);
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for (Index = 0; Index < EntryCount; Index ++, EntryPtr ++) {
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Table = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)(*EntryPtr));
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if (Table->Signature == Signature) {
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return Table;
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}
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}
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return NULL;
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}
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/**
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This function scan ACPI table in XSDT.
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@param Xsdt ACPI XSDT
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@param Signature ACPI table signature
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@return ACPI table
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**/
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VOID *
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ScanTableInXSDT (
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IN EFI_ACPI_DESCRIPTION_HEADER *Xsdt,
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IN UINT32 Signature
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)
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{
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UINTN Index;
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UINT32 EntryCount;
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UINT64 EntryPtr;
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UINTN BasePtr;
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EFI_ACPI_DESCRIPTION_HEADER *Table;
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if (Xsdt == NULL) {
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return NULL;
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}
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EntryCount = (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT64);
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BasePtr = (UINTN)(Xsdt + 1);
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for (Index = 0; Index < EntryCount; Index ++) {
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CopyMem (&EntryPtr, (VOID *)(BasePtr + Index * sizeof(UINT64)), sizeof(UINT64));
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Table = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)(EntryPtr));
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if (Table->Signature == Signature) {
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return Table;
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}
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}
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return NULL;
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}
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/**
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To find Facs in FADT.
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@param Fadt FADT table pointer
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@return Facs table pointer.
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**/
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *
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FindAcpiFacsFromFadt (
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IN EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt
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)
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{
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
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UINT64 Data64;
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if (Fadt == NULL) {
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return NULL;
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}
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if (Fadt->Header.Revision < EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) {
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Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;
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} else {
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if (Fadt->FirmwareCtrl != 0) {
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Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;
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} else {
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CopyMem (&Data64, &Fadt->XFirmwareCtrl, sizeof(UINT64));
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Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Data64;
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}
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}
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return Facs;
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}
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/**
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To find Facs in Acpi tables.
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To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored
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in the table.
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@param AcpiTableGuid The guid used to find ACPI table in UEFI ConfigurationTable.
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@return Facs table pointer.
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**/
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *
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FindAcpiFacsTableByAcpiGuid (
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IN EFI_GUID *AcpiTableGuid
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)
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{
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EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;
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EFI_ACPI_DESCRIPTION_HEADER *Rsdt;
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EFI_ACPI_DESCRIPTION_HEADER *Xsdt;
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EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
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UINTN Index;
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Rsdp = NULL;
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//
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// found ACPI table RSD_PTR from system table
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//
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for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {
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if (CompareGuid (&(gST->ConfigurationTable[Index].VendorGuid), AcpiTableGuid)) {
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//
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// A match was found.
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//
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Rsdp = gST->ConfigurationTable[Index].VendorTable;
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break;
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}
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}
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if (Rsdp == NULL) {
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return NULL;
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}
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//
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// Search XSDT
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//
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if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {
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Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->XsdtAddress;
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Fadt = ScanTableInXSDT (Xsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);
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if (Fadt != NULL) {
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Facs = FindAcpiFacsFromFadt (Fadt);
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if (Facs != NULL) {
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return Facs;
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}
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}
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}
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//
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// Search RSDT
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//
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Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;
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Fadt = ScanTableInRSDT (Rsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);
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if (Fadt != NULL) {
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Facs = FindAcpiFacsFromFadt (Fadt);
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if (Facs != NULL) {
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return Facs;
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}
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}
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return NULL;
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}
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/**
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To find Facs in Acpi tables.
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To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored
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in the table.
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@return Facs table pointer.
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**/
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *
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FindAcpiFacsTable (
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VOID
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)
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{
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EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
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Facs = FindAcpiFacsTableByAcpiGuid (&gEfiAcpi20TableGuid);
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if (Facs != NULL) {
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return Facs;
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}
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return FindAcpiFacsTableByAcpiGuid (&gEfiAcpi10TableGuid);
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}
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/**
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The function will check if long mode waking vector is supported.
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@param[in] Facs Pointer to FACS table.
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@retval TRUE Long mode waking vector is supported.
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@retval FALSE Long mode waking vector is not supported.
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**/
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BOOLEAN
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IsLongModeWakingVectorSupport (
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IN EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs
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)
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{
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if ((Facs == NULL) ||
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(Facs->Signature != EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE) ) {
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//
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// Something wrong with FACS.
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//
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return FALSE;
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}
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if ((Facs->Version == EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_VERSION) &&
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((Facs->Flags & EFI_ACPI_4_0_64BIT_WAKE_SUPPORTED_F) != 0)) {
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//
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// BIOS supports 64bit waking vector.
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//
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if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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Allocates page table buffer.
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@param[in] LongModeWakingVectorSupport Support long mode waking vector or not.
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If BootScriptExector driver will run in 64-bit mode, this function will establish the 1:1
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virtual to physical mapping page table when long mode waking vector is supported, otherwise
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create 4G page table when long mode waking vector is not supported and let PF handler to
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handle > 4G request.
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If BootScriptExector driver will not run in 64-bit mode, this function will do nothing.
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@return Page table base address.
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**/
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EFI_PHYSICAL_ADDRESS
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S3AllocatePageTablesBuffer (
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IN BOOLEAN LongModeWakingVectorSupport
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)
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{
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if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {
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UINTN ExtraPageTablePages;
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UINT32 RegEax;
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UINT32 RegEdx;
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UINT8 PhysicalAddressBits;
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UINT32 NumberOfPml4EntriesNeeded;
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UINT32 NumberOfPdpEntriesNeeded;
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EFI_PHYSICAL_ADDRESS S3NvsPageTableAddress;
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UINTN TotalPageTableSize;
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VOID *Hob;
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BOOLEAN Page1GSupport;
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Page1GSupport = FALSE;
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if (PcdGetBool(PcdUse1GPageTable)) {
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AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
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if (RegEax >= 0x80000001) {
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AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);
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if ((RegEdx & BIT26) != 0) {
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Page1GSupport = TRUE;
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}
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}
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}
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//
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// Get physical address bits supported.
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//
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Hob = GetFirstHob (EFI_HOB_TYPE_CPU);
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if (Hob != NULL) {
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PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;
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} else {
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AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
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if (RegEax >= 0x80000008) {
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AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
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PhysicalAddressBits = (UINT8) RegEax;
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} else {
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PhysicalAddressBits = 36;
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}
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}
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//
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// IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.
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//
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ASSERT (PhysicalAddressBits <= 52);
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if (PhysicalAddressBits > 48) {
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PhysicalAddressBits = 48;
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}
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ExtraPageTablePages = 0;
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if (!LongModeWakingVectorSupport) {
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//
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// Create 4G page table when BIOS does not support long mode waking vector,
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// and let PF handler to handle > 4G request.
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//
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PhysicalAddressBits = 32;
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ExtraPageTablePages = EXTRA_PAGE_TABLE_PAGES;
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}
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//
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// Calculate the table entries needed.
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//
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if (PhysicalAddressBits <= 39 ) {
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NumberOfPml4EntriesNeeded = 1;
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NumberOfPdpEntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 30));
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} else {
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NumberOfPml4EntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 39));
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NumberOfPdpEntriesNeeded = 512;
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}
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//
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// We need calculate whole page size then allocate once, because S3 restore page table does not know each page in Nvs.
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//
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if (!Page1GSupport) {
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TotalPageTableSize = 1 + NumberOfPml4EntriesNeeded + NumberOfPml4EntriesNeeded * NumberOfPdpEntriesNeeded;
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} else {
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TotalPageTableSize = 1 + NumberOfPml4EntriesNeeded;
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}
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TotalPageTableSize += ExtraPageTablePages;
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DEBUG ((EFI_D_ERROR, "AcpiS3ContextSave TotalPageTableSize - 0x%x pages\n", TotalPageTableSize));
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//
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// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
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//
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S3NvsPageTableAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGES_TO_SIZE(TotalPageTableSize));
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ASSERT (S3NvsPageTableAddress != 0);
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return S3NvsPageTableAddress;
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} else {
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//
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// If DXE is running 32-bit mode, no need to establish page table.
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//
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return (EFI_PHYSICAL_ADDRESS) 0;
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}
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}
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/**
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Callback function executed when the EndOfDxe event group is signaled.
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@param[in] Event Event whose notification function is being invoked.
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@param[in] Context The pointer to the notification function's context, which
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is implementation-dependent.
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**/
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VOID
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EFIAPI
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AcpiS3ContextSaveOnEndOfDxe (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS AcpiS3ContextBuffer;
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ACPI_S3_CONTEXT *AcpiS3Context;
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IA32_DESCRIPTOR *Idtr;
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IA32_IDT_GATE_DESCRIPTOR *IdtGate;
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EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
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VOID *Interface;
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DEBUG ((EFI_D_INFO, "AcpiS3ContextSave!\n"));
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Status = gBS->LocateProtocol (&gEfiLockBoxProtocolGuid, NULL, &Interface);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_INFO | EFI_D_WARN, "ACPI S3 context can't be saved without LockBox!\n"));
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goto Done;
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}
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AcpiS3Context = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(*AcpiS3Context));
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ASSERT (AcpiS3Context != NULL);
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AcpiS3ContextBuffer = (EFI_PHYSICAL_ADDRESS)(UINTN)AcpiS3Context;
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//
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// Get ACPI Table because we will save its position to variable
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//
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Facs = (EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *) FindAcpiFacsTable ();
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AcpiS3Context->AcpiFacsTable = (EFI_PHYSICAL_ADDRESS) (UINTN) Facs;
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ASSERT (AcpiS3Context->AcpiFacsTable != 0);
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IdtGate = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 + sizeof(IA32_DESCRIPTOR));
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Idtr = (IA32_DESCRIPTOR *)(IdtGate + 0x100);
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Idtr->Base = (UINTN)IdtGate;
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Idtr->Limit = (UINT16)(sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 - 1);
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AcpiS3Context->IdtrProfile = (EFI_PHYSICAL_ADDRESS)(UINTN)Idtr;
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Status = SaveLockBox (
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&mAcpiS3IdtrProfileGuid,
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(VOID *)(UINTN)Idtr,
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(UINTN)sizeof(IA32_DESCRIPTOR)
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);
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ASSERT_EFI_ERROR (Status);
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Status = SetLockBoxAttributes (&mAcpiS3IdtrProfileGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);
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ASSERT_EFI_ERROR (Status);
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//
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// Allocate page table
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//
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|
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);
|
|
}
|
|
|