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system76-edk2/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsMisc.c
Hao Wu 885c3060c1 IntelFrameworkModulePkg GenericBdsLib: Potential read over memory boudary 
This commit will resolve the issue brought by r17733.

StringBuffer1 = AllocateCopyPool (
                  MAX_STRING_LEN * sizeof (CHAR16),
                  L"Configuration changed. Reset to apply it Now."
                  );

The above using of AllocateCopyPool() will read contents out of the scope
of the constant string. Potential risk for the constant string allocated
at the boundary of memory region.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17929 6f19259b-4bc3-4df7-8a09-765794883524
2015-07-13 01:22:21 +00:00

1590 lines
47 KiB
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/** @file
Misc BDS library function
Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "InternalBdsLib.h"
#define MAX_STRING_LEN 200
BOOLEAN mFeaturerSwitch = TRUE;
BOOLEAN mResetRequired = FALSE;
extern UINT16 gPlatformBootTimeOutDefault;
/**
The function will go through the driver option link list, load and start
every driver the driver option device path point to.
@param BdsDriverLists The header of the current driver option link list
**/
VOID
EFIAPI
BdsLibLoadDrivers (
IN LIST_ENTRY *BdsDriverLists
)
{
EFI_STATUS Status;
LIST_ENTRY *Link;
BDS_COMMON_OPTION *Option;
EFI_HANDLE ImageHandle;
EFI_LOADED_IMAGE_PROTOCOL *ImageInfo;
UINTN ExitDataSize;
CHAR16 *ExitData;
BOOLEAN ReconnectAll;
ReconnectAll = FALSE;
//
// Process the driver option
//
for (Link = BdsDriverLists->ForwardLink; Link != BdsDriverLists; Link = Link->ForwardLink) {
Option = CR (Link, BDS_COMMON_OPTION, Link, BDS_LOAD_OPTION_SIGNATURE);
//
// If a load option is not marked as LOAD_OPTION_ACTIVE,
// the boot manager will not automatically load the option.
//
if (!IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_ACTIVE)) {
continue;
}
//
// If a driver load option is marked as LOAD_OPTION_FORCE_RECONNECT,
// then all of the EFI drivers in the system will be disconnected and
// reconnected after the last driver load option is processed.
//
if (IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_FORCE_RECONNECT)) {
ReconnectAll = TRUE;
}
//
// Make sure the driver path is connected.
//
BdsLibConnectDevicePath (Option->DevicePath);
//
// Load and start the image that Driver#### describes
//
Status = gBS->LoadImage (
FALSE,
gImageHandle,
Option->DevicePath,
NULL,
0,
&ImageHandle
);
if (!EFI_ERROR (Status)) {
gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **) &ImageInfo);
//
// Verify whether this image is a driver, if not,
// exit it and continue to parse next load option
//
if (ImageInfo->ImageCodeType != EfiBootServicesCode && ImageInfo->ImageCodeType != EfiRuntimeServicesCode) {
gBS->Exit (ImageHandle, EFI_INVALID_PARAMETER, 0, NULL);
continue;
}
if (Option->LoadOptionsSize != 0) {
ImageInfo->LoadOptionsSize = Option->LoadOptionsSize;
ImageInfo->LoadOptions = Option->LoadOptions;
}
//
// Before calling the image, enable the Watchdog Timer for
// the 5 Minute period
//
gBS->SetWatchdogTimer (5 * 60, 0x0000, 0x00, NULL);
Status = gBS->StartImage (ImageHandle, &ExitDataSize, &ExitData);
DEBUG ((DEBUG_INFO | DEBUG_LOAD, "Driver Return Status = %r\n", Status));
//
// Clear the Watchdog Timer after the image returns
//
gBS->SetWatchdogTimer (0x0000, 0x0000, 0x0000, NULL);
}
}
//
// Process the LOAD_OPTION_FORCE_RECONNECT driver option
//
if (ReconnectAll) {
BdsLibDisconnectAllEfi ();
BdsLibConnectAll ();
}
}
/**
Get the Option Number that does not used.
Try to locate the specific option variable one by one utile find a free number.
@param VariableName Indicate if the boot#### or driver#### option
@return The Minimal Free Option Number
**/
UINT16
BdsLibGetFreeOptionNumber (
IN CHAR16 *VariableName
)
{
UINTN Index;
CHAR16 StrTemp[10];
UINT16 *OptionBuffer;
UINTN OptionSize;
//
// Try to find the minimum free number from 0, 1, 2, 3....
//
Index = 0;
do {
if (*VariableName == 'B') {
UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Boot%04x", Index);
} else {
UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Driver%04x", Index);
}
//
// try if the option number is used
//
OptionBuffer = BdsLibGetVariableAndSize (
StrTemp,
&gEfiGlobalVariableGuid,
&OptionSize
);
if (OptionBuffer == NULL) {
break;
}
FreePool(OptionBuffer);
Index++;
} while (TRUE);
return ((UINT16) Index);
}
/**
This function will register the new boot#### or driver#### option base on
the VariableName. The new registered boot#### or driver#### will be linked
to BdsOptionList and also update to the VariableName. After the boot#### or
driver#### updated, the BootOrder or DriverOrder will also be updated.
@param BdsOptionList The header of the boot#### or driver#### link list
@param DevicePath The device path which the boot#### or driver####
option present
@param String The description of the boot#### or driver####
@param VariableName Indicate if the boot#### or driver#### option
@retval EFI_SUCCESS The boot#### or driver#### have been success
registered
@retval EFI_STATUS Return the status of gRT->SetVariable ().
**/
EFI_STATUS
EFIAPI
BdsLibRegisterNewOption (
IN LIST_ENTRY *BdsOptionList,
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN CHAR16 *String,
IN CHAR16 *VariableName
)
{
EFI_STATUS Status;
UINTN Index;
UINT16 RegisterOptionNumber;
UINT16 *TempOptionPtr;
UINTN TempOptionSize;
UINT16 *OptionOrderPtr;
VOID *OptionPtr;
UINTN OptionSize;
UINT8 *TempPtr;
EFI_DEVICE_PATH_PROTOCOL *OptionDevicePath;
CHAR16 *Description;
CHAR16 OptionName[10];
BOOLEAN UpdateDescription;
UINT16 BootOrderEntry;
UINTN OrderItemNum;
if (DevicePath == NULL) {
return EFI_INVALID_PARAMETER;
}
OptionPtr = NULL;
OptionSize = 0;
TempPtr = NULL;
OptionDevicePath = NULL;
Description = NULL;
OptionOrderPtr = NULL;
UpdateDescription = FALSE;
Status = EFI_SUCCESS;
ZeroMem (OptionName, sizeof (OptionName));
TempOptionSize = 0;
TempOptionPtr = BdsLibGetVariableAndSize (
VariableName,
&gEfiGlobalVariableGuid,
&TempOptionSize
);
//
// Compare with current option variable if the previous option is set in global variable.
//
for (Index = 0; Index < TempOptionSize / sizeof (UINT16); Index++) {
//
// TempOptionPtr must not be NULL if we have non-zero TempOptionSize.
//
ASSERT (TempOptionPtr != NULL);
if (*VariableName == 'B') {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", TempOptionPtr[Index]);
} else {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", TempOptionPtr[Index]);
}
OptionPtr = BdsLibGetVariableAndSize (
OptionName,
&gEfiGlobalVariableGuid,
&OptionSize
);
if (OptionPtr == NULL) {
continue;
}
//
// Validate the variable.
//
if (!ValidateOption(OptionPtr, OptionSize)) {
FreePool(OptionPtr);
continue;
}
TempPtr = OptionPtr;
TempPtr += sizeof (UINT32) + sizeof (UINT16);
Description = (CHAR16 *) TempPtr;
TempPtr += StrSize ((CHAR16 *) TempPtr);
OptionDevicePath = (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;
//
// Notes: the description may will change base on the GetStringToken
//
if (CompareMem (OptionDevicePath, DevicePath, GetDevicePathSize (OptionDevicePath)) == 0) {
if (CompareMem (Description, String, StrSize (Description)) == 0) {
//
// Got the option, so just return
//
FreePool (OptionPtr);
FreePool (TempOptionPtr);
return EFI_SUCCESS;
} else {
//
// Option description changed, need update.
//
UpdateDescription = TRUE;
FreePool (OptionPtr);
break;
}
}
FreePool (OptionPtr);
}
OptionSize = sizeof (UINT32) + sizeof (UINT16) + StrSize (String);
OptionSize += GetDevicePathSize (DevicePath);
OptionPtr = AllocateZeroPool (OptionSize);
ASSERT (OptionPtr != NULL);
TempPtr = OptionPtr;
*(UINT32 *) TempPtr = LOAD_OPTION_ACTIVE;
TempPtr += sizeof (UINT32);
*(UINT16 *) TempPtr = (UINT16) GetDevicePathSize (DevicePath);
TempPtr += sizeof (UINT16);
CopyMem (TempPtr, String, StrSize (String));
TempPtr += StrSize (String);
CopyMem (TempPtr, DevicePath, GetDevicePathSize (DevicePath));
if (UpdateDescription) {
//
// The number in option#### to be updated.
// In this case, we must have non-NULL TempOptionPtr.
//
ASSERT (TempOptionPtr != NULL);
RegisterOptionNumber = TempOptionPtr[Index];
} else {
//
// The new option#### number
//
RegisterOptionNumber = BdsLibGetFreeOptionNumber(VariableName);
}
if (*VariableName == 'B') {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", RegisterOptionNumber);
} else {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", RegisterOptionNumber);
}
Status = gRT->SetVariable (
OptionName,
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
OptionSize,
OptionPtr
);
//
// Return if only need to update a changed description or fail to set option.
//
if (EFI_ERROR (Status) || UpdateDescription) {
FreePool (OptionPtr);
if (TempOptionPtr != NULL) {
FreePool (TempOptionPtr);
}
return Status;
}
FreePool (OptionPtr);
//
// Update the option order variable
//
//
// If no option order
//
if (TempOptionSize == 0) {
BootOrderEntry = 0;
Status = gRT->SetVariable (
VariableName,
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
sizeof (UINT16),
&BootOrderEntry
);
if (TempOptionPtr != NULL) {
FreePool (TempOptionPtr);
}
return Status;
}
//
// TempOptionPtr must not be NULL if TempOptionSize is not zero.
//
ASSERT (TempOptionPtr != NULL);
//
// Append the new option number to the original option order
//
OrderItemNum = (TempOptionSize / sizeof (UINT16)) + 1 ;
OptionOrderPtr = AllocateZeroPool ( OrderItemNum * sizeof (UINT16));
ASSERT (OptionOrderPtr!= NULL);
CopyMem (OptionOrderPtr, TempOptionPtr, (OrderItemNum - 1) * sizeof (UINT16));
OptionOrderPtr[Index] = RegisterOptionNumber;
Status = gRT->SetVariable (
VariableName,
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
OrderItemNum * sizeof (UINT16),
OptionOrderPtr
);
FreePool (TempOptionPtr);
FreePool (OptionOrderPtr);
return Status;
}
/**
Returns the size of a device path in bytes.
This function returns the size, in bytes, of the device path data structure
specified by DevicePath including the end of device path node. If DevicePath
is NULL, then 0 is returned. If the length of the device path is bigger than
MaxSize, also return 0 to indicate this is an invalidate device path.
@param DevicePath A pointer to a device path data structure.
@param MaxSize Max valid device path size. If big than this size,
return error.
@retval 0 An invalid device path.
@retval Others The size of a device path in bytes.
**/
UINTN
GetDevicePathSizeEx (
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN UINTN MaxSize
)
{
UINTN Size;
UINTN NodeSize;
if (DevicePath == NULL) {
return 0;
}
//
// Search for the end of the device path structure
//
Size = 0;
while (!IsDevicePathEnd (DevicePath)) {
NodeSize = DevicePathNodeLength (DevicePath);
if (NodeSize < END_DEVICE_PATH_LENGTH) {
return 0;
}
Size += NodeSize;
if (Size > MaxSize) {
return 0;
}
DevicePath = NextDevicePathNode (DevicePath);
}
Size += DevicePathNodeLength (DevicePath);
if (Size > MaxSize) {
return 0;
}
return Size;
}
/**
Returns the length of a Null-terminated Unicode string. If the length is
bigger than MaxStringLen, return length 0 to indicate that this is an
invalidate string.
This function returns the byte length of Unicode characters in the Null-terminated
Unicode string specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param MaxStringLen Max string len in this string.
@retval 0 An invalid string.
@retval Others The length of String.
**/
UINTN
StrSizeEx (
IN CONST CHAR16 *String,
IN UINTN MaxStringLen
)
{
UINTN Length;
ASSERT (String != NULL && MaxStringLen != 0);
ASSERT (((UINTN) String & BIT0) == 0);
for (Length = 0; *String != L'\0' && MaxStringLen != Length; String++, Length+=2);
if (*String != L'\0' && MaxStringLen == Length) {
return 0;
}
return Length + 2;
}
/**
Validate the EFI Boot#### variable (VendorGuid/Name)
@param Variable Boot#### variable data.
@param VariableSize Returns the size of the EFI variable that was read
@retval TRUE The variable data is correct.
@retval FALSE The variable data is corrupted.
**/
BOOLEAN
ValidateOption (
UINT8 *Variable,
UINTN VariableSize
)
{
UINT16 FilePathSize;
UINT8 *TempPtr;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
UINTN TempSize;
if (VariableSize <= sizeof (UINT16) + sizeof (UINT32)) {
return FALSE;
}
//
// Skip the option attribute
//
TempPtr = Variable;
TempPtr += sizeof (UINT32);
//
// Get the option's device path size
//
FilePathSize = *(UINT16 *) TempPtr;
TempPtr += sizeof (UINT16);
//
// Get the option's description string size
//
TempSize = StrSizeEx ((CHAR16 *) TempPtr, VariableSize - sizeof (UINT16) - sizeof (UINT32));
TempPtr += TempSize;
//
// Get the option's device path
//
DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;
TempPtr += FilePathSize;
//
// Validation boot option variable.
//
if ((FilePathSize == 0) || (TempSize == 0)) {
return FALSE;
}
if (TempSize + FilePathSize + sizeof (UINT16) + sizeof (UINT32) > VariableSize) {
return FALSE;
}
return (BOOLEAN) (GetDevicePathSizeEx (DevicePath, FilePathSize) != 0);
}
/**
Convert a single character to number.
It assumes the input Char is in the scope of L'0' ~ L'9' and L'A' ~ L'F'
@param Char The input char which need to change to a hex number.
**/
UINTN
CharToUint (
IN CHAR16 Char
)
{
if ((Char >= L'0') && (Char <= L'9')) {
return (UINTN) (Char - L'0');
}
if ((Char >= L'A') && (Char <= L'F')) {
return (UINTN) (Char - L'A' + 0xA);
}
ASSERT (FALSE);
return 0;
}
/**
Build the boot#### or driver#### option from the VariableName, the
build boot#### or driver#### will also be linked to BdsCommonOptionList.
@param BdsCommonOptionList The header of the boot#### or driver#### option
link list
@param VariableName EFI Variable name indicate if it is boot#### or
driver####
@retval BDS_COMMON_OPTION Get the option just been created
@retval NULL Failed to get the new option
**/
BDS_COMMON_OPTION *
EFIAPI
BdsLibVariableToOption (
IN OUT LIST_ENTRY *BdsCommonOptionList,
IN CHAR16 *VariableName
)
{
UINT32 Attribute;
UINT16 FilePathSize;
UINT8 *Variable;
UINT8 *TempPtr;
UINTN VariableSize;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
BDS_COMMON_OPTION *Option;
VOID *LoadOptions;
UINT32 LoadOptionsSize;
CHAR16 *Description;
UINT8 NumOff;
//
// Read the variable. We will never free this data.
//
Variable = BdsLibGetVariableAndSize (
VariableName,
&gEfiGlobalVariableGuid,
&VariableSize
);
if (Variable == NULL) {
return NULL;
}
//
// Validate Boot#### variable data.
//
if (!ValidateOption(Variable, VariableSize)) {
FreePool (Variable);
return NULL;
}
//
// Notes: careful defined the variable of Boot#### or
// Driver####, consider use some macro to abstract the code
//
//
// Get the option attribute
//
TempPtr = Variable;
Attribute = *(UINT32 *) Variable;
TempPtr += sizeof (UINT32);
//
// Get the option's device path size
//
FilePathSize = *(UINT16 *) TempPtr;
TempPtr += sizeof (UINT16);
//
// Get the option's description string
//
Description = (CHAR16 *) TempPtr;
//
// Get the option's description string size
//
TempPtr += StrSize((CHAR16 *) TempPtr);
//
// Get the option's device path
//
DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;
TempPtr += FilePathSize;
//
// Get load opion data.
//
LoadOptions = TempPtr;
LoadOptionsSize = (UINT32) (VariableSize - (UINTN) (TempPtr - Variable));
//
// The Console variables may have multiple device paths, so make
// an Entry for each one.
//
Option = AllocateZeroPool (sizeof (BDS_COMMON_OPTION));
if (Option == NULL) {
FreePool (Variable);
return NULL;
}
Option->Signature = BDS_LOAD_OPTION_SIGNATURE;
Option->DevicePath = AllocateZeroPool (GetDevicePathSize (DevicePath));
ASSERT(Option->DevicePath != NULL);
CopyMem (Option->DevicePath, DevicePath, GetDevicePathSize (DevicePath));
Option->Attribute = Attribute;
Option->Description = AllocateZeroPool (StrSize (Description));
ASSERT(Option->Description != NULL);
CopyMem (Option->Description, Description, StrSize (Description));
Option->LoadOptions = AllocateZeroPool (LoadOptionsSize);
ASSERT(Option->LoadOptions != NULL);
CopyMem (Option->LoadOptions, LoadOptions, LoadOptionsSize);
Option->LoadOptionsSize = LoadOptionsSize;
//
// Get the value from VariableName Unicode string
// since the ISO standard assumes ASCII equivalent abbreviations, we can be safe in converting this
// Unicode stream to ASCII without any loss in meaning.
//
if (*VariableName == 'B') {
NumOff = (UINT8) (sizeof (L"Boot") / sizeof (CHAR16) - 1);
Option->BootCurrent = (UINT16) (CharToUint (VariableName[NumOff+0]) * 0x1000)
+ (UINT16) (CharToUint (VariableName[NumOff+1]) * 0x100)
+ (UINT16) (CharToUint (VariableName[NumOff+2]) * 0x10)
+ (UINT16) (CharToUint (VariableName[NumOff+3]) * 0x1);
}
InsertTailList (BdsCommonOptionList, &Option->Link);
FreePool (Variable);
return Option;
}
/**
Process BootOrder, or DriverOrder variables, by calling
BdsLibVariableToOption () for each UINT16 in the variables.
@param BdsCommonOptionList The header of the option list base on variable
VariableName
@param VariableName EFI Variable name indicate the BootOrder or
DriverOrder
@retval EFI_SUCCESS Success create the boot option or driver option
list
@retval EFI_OUT_OF_RESOURCES Failed to get the boot option or driver option list
**/
EFI_STATUS
EFIAPI
BdsLibBuildOptionFromVar (
IN LIST_ENTRY *BdsCommonOptionList,
IN CHAR16 *VariableName
)
{
UINT16 *OptionOrder;
UINTN OptionOrderSize;
UINTN Index;
BDS_COMMON_OPTION *Option;
CHAR16 OptionName[20];
//
// Zero Buffer in order to get all BOOT#### variables
//
ZeroMem (OptionName, sizeof (OptionName));
//
// Read the BootOrder, or DriverOrder variable.
//
OptionOrder = BdsLibGetVariableAndSize (
VariableName,
&gEfiGlobalVariableGuid,
&OptionOrderSize
);
if (OptionOrder == NULL) {
return EFI_OUT_OF_RESOURCES;
}
for (Index = 0; Index < OptionOrderSize / sizeof (UINT16); Index++) {
if (*VariableName == 'B') {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", OptionOrder[Index]);
} else {
UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", OptionOrder[Index]);
}
Option = BdsLibVariableToOption (BdsCommonOptionList, OptionName);
if (Option != NULL) {
Option->BootCurrent = OptionOrder[Index];
}
}
FreePool (OptionOrder);
return EFI_SUCCESS;
}
/**
Get boot mode by looking up configuration table and parsing HOB list
@param BootMode Boot mode from PEI handoff HOB.
@retval EFI_SUCCESS Successfully get boot mode
**/
EFI_STATUS
EFIAPI
BdsLibGetBootMode (
OUT EFI_BOOT_MODE *BootMode
)
{
*BootMode = GetBootModeHob ();
return EFI_SUCCESS;
}
/**
Read the EFI variable (VendorGuid/Name) and return a dynamically allocated
buffer, and the size of the buffer. If failure return NULL.
@param Name String part of EFI variable name
@param VendorGuid GUID part of EFI variable name
@param VariableSize Returns the size of the EFI variable that was read
@return Dynamically allocated memory that contains a copy of the EFI variable
Caller is responsible freeing the buffer.
@retval NULL Variable was not read
**/
VOID *
EFIAPI
BdsLibGetVariableAndSize (
IN CHAR16 *Name,
IN EFI_GUID *VendorGuid,
OUT UINTN *VariableSize
)
{
EFI_STATUS Status;
UINTN BufferSize;
VOID *Buffer;
Buffer = NULL;
//
// Pass in a zero size buffer to find the required buffer size.
//
BufferSize = 0;
Status = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);
if (Status == EFI_BUFFER_TOO_SMALL) {
//
// Allocate the buffer to return
//
Buffer = AllocateZeroPool (BufferSize);
if (Buffer == NULL) {
*VariableSize = 0;
return NULL;
}
//
// Read variable into the allocated buffer.
//
Status = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);
if (EFI_ERROR (Status)) {
FreePool (Buffer);
BufferSize = 0;
Buffer = NULL;
}
}
ASSERT (((Buffer == NULL) && (BufferSize == 0)) ||
((Buffer != NULL) && (BufferSize != 0))
);
*VariableSize = BufferSize;
return Buffer;
}
/**
Delete the instance in Multi which matches partly with Single instance
@param Multi A pointer to a multi-instance device path data
structure.
@param Single A pointer to a single-instance device path data
structure.
@return This function will remove the device path instances in Multi which partly
match with the Single, and return the result device path. If there is no
remaining device path as a result, this function will return NULL.
**/
EFI_DEVICE_PATH_PROTOCOL *
EFIAPI
BdsLibDelPartMatchInstance (
IN EFI_DEVICE_PATH_PROTOCOL *Multi,
IN EFI_DEVICE_PATH_PROTOCOL *Single
)
{
EFI_DEVICE_PATH_PROTOCOL *Instance;
EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
EFI_DEVICE_PATH_PROTOCOL *TempNewDevicePath;
UINTN InstanceSize;
UINTN SingleDpSize;
UINTN Size;
NewDevicePath = NULL;
TempNewDevicePath = NULL;
if (Multi == NULL || Single == NULL) {
return Multi;
}
Instance = GetNextDevicePathInstance (&Multi, &InstanceSize);
SingleDpSize = GetDevicePathSize (Single) - END_DEVICE_PATH_LENGTH;
InstanceSize -= END_DEVICE_PATH_LENGTH;
while (Instance != NULL) {
Size = (SingleDpSize < InstanceSize) ? SingleDpSize : InstanceSize;
if ((CompareMem (Instance, Single, Size) != 0)) {
//
// Append the device path instance which does not match with Single
//
TempNewDevicePath = NewDevicePath;
NewDevicePath = AppendDevicePathInstance (NewDevicePath, Instance);
if (TempNewDevicePath != NULL) {
FreePool(TempNewDevicePath);
}
}
FreePool(Instance);
Instance = GetNextDevicePathInstance (&Multi, &InstanceSize);
InstanceSize -= END_DEVICE_PATH_LENGTH;
}
return NewDevicePath;
}
/**
Function compares a device path data structure to that of all the nodes of a
second device path instance.
@param Multi A pointer to a multi-instance device path data
structure.
@param Single A pointer to a single-instance device path data
structure.
@retval TRUE If the Single device path is contained within Multi device path.
@retval FALSE The Single device path is not match within Multi device path.
**/
BOOLEAN
EFIAPI
BdsLibMatchDevicePaths (
IN EFI_DEVICE_PATH_PROTOCOL *Multi,
IN EFI_DEVICE_PATH_PROTOCOL *Single
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_DEVICE_PATH_PROTOCOL *DevicePathInst;
UINTN Size;
if (Multi == NULL || Single == NULL) {
return FALSE;
}
DevicePath = Multi;
DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);
//
// Search for the match of 'Single' in 'Multi'
//
while (DevicePathInst != NULL) {
//
// If the single device path is found in multiple device paths,
// return success
//
if (CompareMem (Single, DevicePathInst, Size) == 0) {
FreePool (DevicePathInst);
return TRUE;
}
FreePool (DevicePathInst);
DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);
}
return FALSE;
}
/**
This function prints a series of strings.
@param ConOut Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
@param ... A variable argument list containing series of
strings, the last string must be NULL.
@retval EFI_SUCCESS Success print out the string using ConOut.
@retval EFI_STATUS Return the status of the ConOut->OutputString ().
**/
EFI_STATUS
EFIAPI
BdsLibOutputStrings (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *ConOut,
...
)
{
VA_LIST Args;
EFI_STATUS Status;
CHAR16 *String;
Status = EFI_SUCCESS;
VA_START (Args, ConOut);
while (!EFI_ERROR (Status)) {
//
// If String is NULL, then it's the end of the list
//
String = VA_ARG (Args, CHAR16 *);
if (String == NULL) {
break;
}
Status = ConOut->OutputString (ConOut, String);
if (EFI_ERROR (Status)) {
break;
}
}
VA_END(Args);
return Status;
}
//
// Following are BDS Lib functions which contain all the code about setup browser reset reminder feature.
// Setup Browser reset reminder feature is that an reset reminder will be given before user leaves the setup browser if
// user change any option setting which needs a reset to be effective, and the reset will be applied according to the user selection.
//
/**
Enable the setup browser reset reminder feature.
This routine is used in platform tip. If the platform policy need the feature, use the routine to enable it.
**/
VOID
EFIAPI
EnableResetReminderFeature (
VOID
)
{
mFeaturerSwitch = TRUE;
}
/**
Disable the setup browser reset reminder feature.
This routine is used in platform tip. If the platform policy do not want the feature, use the routine to disable it.
**/
VOID
EFIAPI
DisableResetReminderFeature (
VOID
)
{
mFeaturerSwitch = FALSE;
}
/**
Record the info that a reset is required.
A module boolean variable is used to record whether a reset is required.
**/
VOID
EFIAPI
EnableResetRequired (
VOID
)
{
mResetRequired = TRUE;
}
/**
Record the info that no reset is required.
A module boolean variable is used to record whether a reset is required.
**/
VOID
EFIAPI
DisableResetRequired (
VOID
)
{
mResetRequired = FALSE;
}
/**
Check whether platform policy enable the reset reminder feature. The default is enabled.
**/
BOOLEAN
EFIAPI
IsResetReminderFeatureEnable (
VOID
)
{
return mFeaturerSwitch;
}
/**
Check if user changed any option setting which needs a system reset to be effective.
**/
BOOLEAN
EFIAPI
IsResetRequired (
VOID
)
{
return mResetRequired;
}
/**
Check whether a reset is needed, and finish the reset reminder feature.
If a reset is needed, Popup a menu to notice user, and finish the feature
according to the user selection.
**/
VOID
EFIAPI
SetupResetReminder (
VOID
)
{
EFI_INPUT_KEY Key;
CHAR16 *StringBuffer1;
CHAR16 *StringBuffer2;
//
//check any reset required change is applied? if yes, reset system
//
if (IsResetReminderFeatureEnable ()) {
if (IsResetRequired ()) {
StringBuffer1 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
ASSERT (StringBuffer1 != NULL);
StringBuffer2 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
ASSERT (StringBuffer2 != NULL);
StrCpyS (
StringBuffer1,
MAX_STRING_LEN,
L"Configuration changed. Reset to apply it Now."
);
StrCpyS (
StringBuffer2,
MAX_STRING_LEN,
L"Press ENTER to reset"
);
//
// Popup a menu to notice user
//
do {
CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, StringBuffer1, StringBuffer2, NULL);
} while (Key.UnicodeChar != CHAR_CARRIAGE_RETURN);
FreePool (StringBuffer1);
FreePool (StringBuffer2);
gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
}
}
}
/**
Get the headers (dos, image, optional header) from an image
@param Device SimpleFileSystem device handle
@param FileName File name for the image
@param DosHeader Pointer to dos header
@param Hdr The buffer in which to return the PE32, PE32+, or TE header.
@retval EFI_SUCCESS Successfully get the machine type.
@retval EFI_NOT_FOUND The file is not found.
@retval EFI_LOAD_ERROR File is not a valid image file.
**/
EFI_STATUS
EFIAPI
BdsLibGetImageHeader (
IN EFI_HANDLE Device,
IN CHAR16 *FileName,
OUT EFI_IMAGE_DOS_HEADER *DosHeader,
OUT EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr
)
{
EFI_STATUS Status;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_FILE_HANDLE Root;
EFI_FILE_HANDLE ThisFile;
UINTN BufferSize;
UINT64 FileSize;
EFI_FILE_INFO *Info;
Root = NULL;
ThisFile = NULL;
//
// Handle the file system interface to the device
//
Status = gBS->HandleProtocol (
Device,
&gEfiSimpleFileSystemProtocolGuid,
(VOID *) &Volume
);
if (EFI_ERROR (Status)) {
goto Done;
}
Status = Volume->OpenVolume (
Volume,
&Root
);
if (EFI_ERROR (Status)) {
Root = NULL;
goto Done;
}
ASSERT (Root != NULL);
Status = Root->Open (Root, &ThisFile, FileName, EFI_FILE_MODE_READ, 0);
if (EFI_ERROR (Status)) {
goto Done;
}
ASSERT (ThisFile != NULL);
//
// Get file size
//
BufferSize = SIZE_OF_EFI_FILE_INFO + 200;
do {
Info = NULL;
Status = gBS->AllocatePool (EfiBootServicesData, BufferSize, (VOID **) &Info);
if (EFI_ERROR (Status)) {
goto Done;
}
Status = ThisFile->GetInfo (
ThisFile,
&gEfiFileInfoGuid,
&BufferSize,
Info
);
if (!EFI_ERROR (Status)) {
break;
}
if (Status != EFI_BUFFER_TOO_SMALL) {
FreePool (Info);
goto Done;
}
FreePool (Info);
} while (TRUE);
FileSize = Info->FileSize;
FreePool (Info);
//
// Read dos header
//
BufferSize = sizeof (EFI_IMAGE_DOS_HEADER);
Status = ThisFile->Read (ThisFile, &BufferSize, DosHeader);
if (EFI_ERROR (Status) ||
BufferSize < sizeof (EFI_IMAGE_DOS_HEADER) ||
FileSize <= DosHeader->e_lfanew ||
DosHeader->e_magic != EFI_IMAGE_DOS_SIGNATURE) {
Status = EFI_LOAD_ERROR;
goto Done;
}
//
// Move to PE signature
//
Status = ThisFile->SetPosition (ThisFile, DosHeader->e_lfanew);
if (EFI_ERROR (Status)) {
Status = EFI_LOAD_ERROR;
goto Done;
}
//
// Read and check PE signature
//
BufferSize = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);
Status = ThisFile->Read (ThisFile, &BufferSize, Hdr.Pe32);
if (EFI_ERROR (Status) ||
BufferSize < sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION) ||
Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {
Status = EFI_LOAD_ERROR;
goto Done;
}
//
// Check PE32 or PE32+ magic
//
if (Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC &&
Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
Status = EFI_LOAD_ERROR;
goto Done;
}
Done:
if (ThisFile != NULL) {
ThisFile->Close (ThisFile);
}
if (Root != NULL) {
Root->Close (Root);
}
return Status;
}
/**
This routine adjust the memory information for different memory type and
save them into the variables for next boot.
**/
VOID
BdsSetMemoryTypeInformationVariable (
VOID
)
{
EFI_STATUS Status;
EFI_MEMORY_TYPE_INFORMATION *PreviousMemoryTypeInformation;
EFI_MEMORY_TYPE_INFORMATION *CurrentMemoryTypeInformation;
UINTN VariableSize;
UINTN Index;
UINTN Index1;
UINT32 Previous;
UINT32 Current;
UINT32 Next;
EFI_HOB_GUID_TYPE *GuidHob;
BOOLEAN MemoryTypeInformationModified;
BOOLEAN MemoryTypeInformationVariableExists;
EFI_BOOT_MODE BootMode;
MemoryTypeInformationModified = FALSE;
MemoryTypeInformationVariableExists = FALSE;
BootMode = GetBootModeHob ();
//
// In BOOT_IN_RECOVERY_MODE, Variable region is not reliable.
//
if (BootMode == BOOT_IN_RECOVERY_MODE) {
return;
}
//
// Only check the the Memory Type Information variable in the boot mode
// other than BOOT_WITH_DEFAULT_SETTINGS because the Memory Type
// Information is not valid in this boot mode.
//
if (BootMode != BOOT_WITH_DEFAULT_SETTINGS) {
VariableSize = 0;
Status = gRT->GetVariable (
EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,
&gEfiMemoryTypeInformationGuid,
NULL,
&VariableSize,
NULL
);
if (Status == EFI_BUFFER_TOO_SMALL) {
MemoryTypeInformationVariableExists = TRUE;
}
}
//
// Retrieve the current memory usage statistics. If they are not found, then
// no adjustments can be made to the Memory Type Information variable.
//
Status = EfiGetSystemConfigurationTable (
&gEfiMemoryTypeInformationGuid,
(VOID **) &CurrentMemoryTypeInformation
);
if (EFI_ERROR (Status) || CurrentMemoryTypeInformation == NULL) {
return;
}
//
// Get the Memory Type Information settings from Hob if they exist,
// PEI is responsible for getting them from variable and build a Hob to save them.
// If the previous Memory Type Information is not available, then set defaults
//
GuidHob = GetFirstGuidHob (&gEfiMemoryTypeInformationGuid);
if (GuidHob == NULL) {
//
// If Platform has not built Memory Type Info into the Hob, just return.
//
return;
}
PreviousMemoryTypeInformation = GET_GUID_HOB_DATA (GuidHob);
VariableSize = GET_GUID_HOB_DATA_SIZE (GuidHob);
//
// Use a heuristic to adjust the Memory Type Information for the next boot
//
DEBUG ((EFI_D_INFO, "Memory Previous Current Next \n"));
DEBUG ((EFI_D_INFO, " Type Pages Pages Pages \n"));
DEBUG ((EFI_D_INFO, "====== ======== ======== ========\n"));
for (Index = 0; PreviousMemoryTypeInformation[Index].Type != EfiMaxMemoryType; Index++) {
for (Index1 = 0; CurrentMemoryTypeInformation[Index1].Type != EfiMaxMemoryType; Index1++) {
if (PreviousMemoryTypeInformation[Index].Type == CurrentMemoryTypeInformation[Index1].Type) {
break;
}
}
if (CurrentMemoryTypeInformation[Index1].Type == EfiMaxMemoryType) {
continue;
}
//
// Previous is the number of pages pre-allocated
// Current is the number of pages actually needed
//
Previous = PreviousMemoryTypeInformation[Index].NumberOfPages;
Current = CurrentMemoryTypeInformation[Index1].NumberOfPages;
Next = Previous;
//
// Inconsistent Memory Reserved across bootings may lead to S4 fail
// Write next varible to 125% * current when the pre-allocated memory is:
// 1. More than 150% of needed memory and boot mode is BOOT_WITH_DEFAULT_SETTING
// 2. Less than the needed memory
//
if ((Current + (Current >> 1)) < Previous) {
if (BootMode == BOOT_WITH_DEFAULT_SETTINGS) {
Next = Current + (Current >> 2);
}
} else if (Current > Previous) {
Next = Current + (Current >> 2);
}
if (Next > 0 && Next < 4) {
Next = 4;
}
if (Next != Previous) {
PreviousMemoryTypeInformation[Index].NumberOfPages = Next;
MemoryTypeInformationModified = TRUE;
}
DEBUG ((EFI_D_INFO, " %02x %08x %08x %08x\n", PreviousMemoryTypeInformation[Index].Type, Previous, Current, Next));
}
//
// If any changes were made to the Memory Type Information settings, then set the new variable value;
// Or create the variable in first boot.
//
if (MemoryTypeInformationModified || !MemoryTypeInformationVariableExists) {
Status = SetVariableAndReportStatusCodeOnError (
EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,
&gEfiMemoryTypeInformationGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,
VariableSize,
PreviousMemoryTypeInformation
);
if (!EFI_ERROR (Status)) {
//
// If the Memory Type Information settings have been modified, then reset the platform
// so the new Memory Type Information setting will be used to guarantee that an S4
// entry/resume cycle will not fail.
//
if (MemoryTypeInformationModified && PcdGetBool (PcdResetOnMemoryTypeInformationChange)) {
DEBUG ((EFI_D_INFO, "Memory Type Information settings change. Warm Reset!!!\n"));
gRT->ResetSystem (EfiResetWarm, EFI_SUCCESS, 0, NULL);
}
} else {
DEBUG ((EFI_D_ERROR, "Memory Type Information settings cannot be saved. OS S4 may fail!\n"));
}
}
}
/**
This routine is kept for backward compatibility.
**/
VOID
EFIAPI
BdsLibSaveMemoryTypeInformation (
VOID
)
{
}
/**
Identify a user and, if authenticated, returns the current user profile handle.
@param[out] User Point to user profile handle.
@retval EFI_SUCCESS User is successfully identified, or user identification
is not supported.
@retval EFI_ACCESS_DENIED User is not successfully identified
**/
EFI_STATUS
EFIAPI
BdsLibUserIdentify (
OUT EFI_USER_PROFILE_HANDLE *User
)
{
EFI_STATUS Status;
EFI_USER_MANAGER_PROTOCOL *Manager;
Status = gBS->LocateProtocol (
&gEfiUserManagerProtocolGuid,
NULL,
(VOID **) &Manager
);
if (EFI_ERROR (Status)) {
return EFI_SUCCESS;
}
return Manager->Identify (Manager, User);
}
/**
Set the variable and report the error through status code upon failure.
@param VariableName A Null-terminated string that is the name of the vendor's variable.
Each VariableName is unique for each VendorGuid. VariableName must
contain 1 or more characters. If VariableName is an empty string,
then EFI_INVALID_PARAMETER is returned.
@param VendorGuid A unique identifier for the vendor.
@param Attributes Attributes bitmask to set for the variable.
@param DataSize The size in bytes of the Data buffer. Unless the EFI_VARIABLE_APPEND_WRITE,
EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, or
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute is set, a size of zero
causes the variable to be deleted. When the EFI_VARIABLE_APPEND_WRITE attribute is
set, then a SetVariable() call with a DataSize of zero will not cause any change to
the variable value (the timestamp associated with the variable may be updated however
even if no new data value is provided,see the description of the
EFI_VARIABLE_AUTHENTICATION_2 descriptor below. In this case the DataSize will not
be zero since the EFI_VARIABLE_AUTHENTICATION_2 descriptor will be populated).
@param Data The contents for the variable.
@retval EFI_SUCCESS The firmware has successfully stored the variable and its data as
defined by the Attributes.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits, name, and GUID was supplied, or the
DataSize exceeds the maximum allowed.
@retval EFI_INVALID_PARAMETER VariableName is an empty string.
@retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.
@retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error.
@retval EFI_WRITE_PROTECTED The variable in question is read-only.
@retval EFI_WRITE_PROTECTED The variable in question cannot be deleted.
@retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
or EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACESS being set, but the AuthInfo
does NOT pass the validation check carried out by the firmware.
@retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.
**/
EFI_STATUS
SetVariableAndReportStatusCodeOnError (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data
)
{
EFI_STATUS Status;
EDKII_SET_VARIABLE_STATUS *SetVariableStatus;
UINTN NameSize;
Status = gRT->SetVariable (
VariableName,
VendorGuid,
Attributes,
DataSize,
Data
);
if (EFI_ERROR (Status)) {
NameSize = StrSize (VariableName);
SetVariableStatus = AllocatePool (sizeof (EDKII_SET_VARIABLE_STATUS) + NameSize + DataSize);
if (SetVariableStatus != NULL) {
CopyGuid (&SetVariableStatus->Guid, VendorGuid);
SetVariableStatus->NameSize = NameSize;
SetVariableStatus->DataSize = DataSize;
SetVariableStatus->SetStatus = Status;
SetVariableStatus->Attributes = Attributes;
CopyMem (SetVariableStatus + 1, VariableName, NameSize);
if ((Data != NULL) && (DataSize != 0)) {
CopyMem (((UINT8 *) (SetVariableStatus + 1)) + NameSize, Data, DataSize);
}
REPORT_STATUS_CODE_EX (
EFI_ERROR_CODE,
PcdGet32 (PcdErrorCodeSetVariable),
0,
NULL,
&gEdkiiStatusCodeDataTypeVariableGuid,
SetVariableStatus,
sizeof (EDKII_SET_VARIABLE_STATUS) + NameSize + DataSize
);
FreePool (SetVariableStatus);
}
}
return Status;
}
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