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audk/MdePkg/Library/UefiLib/UefiLib.c

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/** @file
The UEFI Library provides functions and macros that simplify the development of
UEFI Drivers and UEFI Applications. These functions and macros help manage EFI
events, build simple locks utilizing EFI Task Priority Levels (TPLs), install
EFI Driver Model related protocols, manage Unicode string tables for UEFI Drivers,
and print messages on the console output and standard error devices.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "UefiLibInternal.h"
/**
Empty constructor function that is required to resolve dependencies between
libraries.
** DO NOT REMOVE **
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor executed correctly.
**/
EFI_STATUS
EFIAPI
UefiLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EFI_SUCCESS;
}
/**
Compare whether two names of languages are identical.
@param Language1 Name of language 1.
@param Language2 Name of language 2.
@retval TRUE Language 1 and language 2 are the same.
@retval FALSE Language 1 and language 2 are not the same.
**/
BOOLEAN
CompareIso639LanguageCode (
IN CONST CHAR8 *Language1,
IN CONST CHAR8 *Language2
)
{
UINT32 Name1;
UINT32 Name2;
Name1 = ReadUnaligned24 ((CONST UINT32 *) Language1);
Name2 = ReadUnaligned24 ((CONST UINT32 *) Language2);
return (BOOLEAN) (Name1 == Name2);
}
/**
Retrieves a pointer to the system configuration table from the EFI System Table
based on a specified GUID.
This function searches the list of configuration tables stored in the EFI System Table
for a table with a GUID that matches TableGuid. If a match is found, then a pointer to
the configuration table is returned in Table., and EFI_SUCCESS is returned. If a matching GUID
is not found, then EFI_NOT_FOUND is returned.
If TableGuid is NULL, then ASSERT().
If Table is NULL, then ASSERT().
@param TableGuid The pointer to table's GUID type.
@param Table The pointer to the table associated with TableGuid in the EFI System Table.
@retval EFI_SUCCESS A configuration table matching TableGuid was found.
@retval EFI_NOT_FOUND A configuration table matching TableGuid could not be found.
**/
EFI_STATUS
EFIAPI
EfiGetSystemConfigurationTable (
IN EFI_GUID *TableGuid,
OUT VOID **Table
)
{
EFI_SYSTEM_TABLE *SystemTable;
UINTN Index;
ASSERT (TableGuid != NULL);
ASSERT (Table != NULL);
SystemTable = gST;
*Table = NULL;
for (Index = 0; Index < SystemTable->NumberOfTableEntries; Index++) {
if (CompareGuid (TableGuid, &(SystemTable->ConfigurationTable[Index].VendorGuid))) {
*Table = SystemTable->ConfigurationTable[Index].VendorTable;
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/**
Creates and returns a notification event and registers that event with all the protocol
instances specified by ProtocolGuid.
This function causes the notification function to be executed for every protocol of type
ProtocolGuid instance that exists in the system when this function is invoked. If there are
no instances of ProtocolGuid in the handle database at the time this function is invoked,
then the notification function is still executed one time. In addition, every time a protocol
of type ProtocolGuid instance is installed or reinstalled, the notification function is also
executed. This function returns the notification event that was created.
If ProtocolGuid is NULL, then ASSERT().
If NotifyTpl is not a legal TPL value, then ASSERT().
If NotifyFunction is NULL, then ASSERT().
If Registration is NULL, then ASSERT().
@param ProtocolGuid Supplies GUID of the protocol upon whose installation the event is fired.
@param NotifyTpl Supplies the task priority level of the event notifications.
@param NotifyFunction Supplies the function to notify when the event is signaled.
@param NotifyContext The context parameter to pass to NotifyFunction.
@param Registration A pointer to a memory location to receive the registration value.
This value is passed to LocateHandle() to obtain new handles that
have been added that support the ProtocolGuid-specified protocol.
@return The notification event that was created.
**/
EFI_EVENT
EFIAPI
EfiCreateProtocolNotifyEvent(
IN EFI_GUID *ProtocolGuid,
IN EFI_TPL NotifyTpl,
IN EFI_EVENT_NOTIFY NotifyFunction,
IN VOID *NotifyContext, OPTIONAL
OUT VOID **Registration
)
{
EFI_STATUS Status;
EFI_EVENT Event;
ASSERT (ProtocolGuid != NULL);
ASSERT (NotifyFunction != NULL);
ASSERT (Registration != NULL);
//
// Create the event
//
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
NotifyFunction,
NotifyContext,
&Event
);
ASSERT_EFI_ERROR (Status);
//
// Register for protocol notifications on this event
//
Status = gBS->RegisterProtocolNotify (
ProtocolGuid,
Event,
Registration
);
ASSERT_EFI_ERROR (Status);
//
// Kick the event so we will perform an initial pass of
// current installed drivers
//
gBS->SignalEvent (Event);
return Event;
}
/**
Creates a named event that can be signaled with EfiNamedEventSignal().
This function creates an event using NotifyTpl, NoifyFunction, and NotifyContext.
This event is signaled with EfiNamedEventSignal(). This provides the ability for one or more
listeners on the same event named by the GUID specified by Name.
If Name is NULL, then ASSERT().
If NotifyTpl is not a legal TPL value, then ASSERT().
If NotifyFunction is NULL, then ASSERT().
@param Name Supplies the GUID name of the event.
@param NotifyTpl Supplies the task priority level of the event notifications.
@param NotifyFunction Supplies the function to notify when the event is signaled.
@param NotifyContext The context parameter to pass to NotifyFunction.
@param Registration A pointer to a memory location to receive the registration value.
@retval EFI_SUCCESS A named event was created.
@retval EFI_OUT_OF_RESOURCES There are not enough resource to create the named event.
**/
EFI_STATUS
EFIAPI
EfiNamedEventListen (
IN CONST EFI_GUID *Name,
IN EFI_TPL NotifyTpl,
IN EFI_EVENT_NOTIFY NotifyFunction,
IN CONST VOID *NotifyContext, OPTIONAL
OUT VOID *Registration OPTIONAL
)
{
EFI_STATUS Status;
EFI_EVENT Event;
VOID *RegistrationLocal;
ASSERT (Name != NULL);
ASSERT (NotifyFunction != NULL);
ASSERT (NotifyTpl <= TPL_HIGH_LEVEL);
//
// Create event
//
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
NotifyFunction,
(VOID *) NotifyContext,
&Event
);
ASSERT_EFI_ERROR (Status);
//
// The Registration is not optional to RegisterProtocolNotify().
// To make it optional to EfiNamedEventListen(), may need to substitute with a local.
//
if (Registration != NULL) {
RegistrationLocal = Registration;
} else {
RegistrationLocal = &RegistrationLocal;
}
//
// Register for an installation of protocol interface
//
Status = gBS->RegisterProtocolNotify (
(EFI_GUID *) Name,
Event,
RegistrationLocal
);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
Signals a named event created with EfiNamedEventListen().
This function signals the named event specified by Name. The named event must have been
created with EfiNamedEventListen().
If Name is NULL, then ASSERT().
@param Name Supplies the GUID name of the event.
@retval EFI_SUCCESS A named event was signaled.
@retval EFI_OUT_OF_RESOURCES There are not enough resource to signal the named event.
**/
EFI_STATUS
EFIAPI
EfiNamedEventSignal (
IN CONST EFI_GUID *Name
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
ASSERT(Name != NULL);
Handle = NULL;
Status = gBS->InstallProtocolInterface (
&Handle,
(EFI_GUID *) Name,
EFI_NATIVE_INTERFACE,
NULL
);
ASSERT_EFI_ERROR (Status);
Status = gBS->UninstallProtocolInterface (
Handle,
(EFI_GUID *) Name,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
Signals an event group by placing a new event in the group temporarily and
signaling it.
@param[in] EventGroup Supplies the unique identifier of the event
group to signal.
@retval EFI_SUCCESS The event group was signaled successfully.
@retval EFI_INVALID_PARAMETER EventGroup is NULL.
@return Error codes that report problems about event
creation or signaling.
**/
EFI_STATUS
EFIAPI
EfiEventGroupSignal (
IN CONST EFI_GUID *EventGroup
)
{
EFI_STATUS Status;
EFI_EVENT Event;
if (EventGroup == NULL) {
return EFI_INVALID_PARAMETER;
}
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
EfiEventEmptyFunction,
NULL,
EventGroup,
&Event
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->SignalEvent (Event);
gBS->CloseEvent (Event);
return Status;
}
/**
An empty function that can be used as NotifyFunction parameter of
CreateEvent() or CreateEventEx().
@param Event Event whose notification function is being invoked.
@param Context The pointer to the notification function's context,
which is implementation-dependent.
**/
VOID
EFIAPI
EfiEventEmptyFunction (
IN EFI_EVENT Event,
IN VOID *Context
)
{
}
/**
Returns the current TPL.
This function returns the current TPL. There is no EFI service to directly
retrieve the current TPL. Instead, the RaiseTPL() function is used to raise
the TPL to TPL_HIGH_LEVEL. This will return the current TPL. The TPL level
can then immediately be restored back to the current TPL level with a call
to RestoreTPL().
@return The current TPL.
**/
EFI_TPL
EFIAPI
EfiGetCurrentTpl (
VOID
)
{
EFI_TPL Tpl;
Tpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
gBS->RestoreTPL (Tpl);
return Tpl;
}
/**
Initializes a basic mutual exclusion lock.
This function initializes a basic mutual exclusion lock to the released state
and returns the lock. Each lock provides mutual exclusion access at its task
priority level. Since there is no preemption or multiprocessor support in EFI,
acquiring the lock only consists of raising to the locks TPL.
If Lock is NULL, then ASSERT().
If Priority is not a valid TPL value, then ASSERT().
@param Lock A pointer to the lock data structure to initialize.
@param Priority EFI TPL is associated with the lock.
@return The lock.
**/
EFI_LOCK *
EFIAPI
EfiInitializeLock (
IN OUT EFI_LOCK *Lock,
IN EFI_TPL Priority
)
{
ASSERT (Lock != NULL);
ASSERT (Priority <= TPL_HIGH_LEVEL);
Lock->Tpl = Priority;
Lock->OwnerTpl = TPL_APPLICATION;
Lock->Lock = EfiLockReleased ;
return Lock;
}
/**
Acquires ownership of a lock.
This function raises the system's current task priority level to the task
priority level of the mutual exclusion lock. Then, it places the lock in the
acquired state.
If Lock is NULL, then ASSERT().
If Lock is not initialized, then ASSERT().
If Lock is already in the acquired state, then ASSERT().
@param Lock A pointer to the lock to acquire.
**/
VOID
EFIAPI
EfiAcquireLock (
IN EFI_LOCK *Lock
)
{
ASSERT (Lock != NULL);
ASSERT (Lock->Lock == EfiLockReleased);
Lock->OwnerTpl = gBS->RaiseTPL (Lock->Tpl);
Lock->Lock = EfiLockAcquired;
}
/**
Acquires ownership of a lock.
This function raises the system's current task priority level to the task priority
level of the mutual exclusion lock. Then, it attempts to place the lock in the acquired state.
If the lock is already in the acquired state, then EFI_ACCESS_DENIED is returned.
Otherwise, EFI_SUCCESS is returned.
If Lock is NULL, then ASSERT().
If Lock is not initialized, then ASSERT().
@param Lock A pointer to the lock to acquire.
@retval EFI_SUCCESS The lock was acquired.
@retval EFI_ACCESS_DENIED The lock could not be acquired because it is already owned.
**/
EFI_STATUS
EFIAPI
EfiAcquireLockOrFail (
IN EFI_LOCK *Lock
)
{
ASSERT (Lock != NULL);
ASSERT (Lock->Lock != EfiLockUninitialized);
if (Lock->Lock == EfiLockAcquired) {
//
// Lock is already owned, so bail out
//
return EFI_ACCESS_DENIED;
}
Lock->OwnerTpl = gBS->RaiseTPL (Lock->Tpl);
Lock->Lock = EfiLockAcquired;
return EFI_SUCCESS;
}
/**
Releases ownership of a lock.
This function transitions a mutual exclusion lock from the acquired state to
the released state, and restores the system's task priority level to its
previous level.
If Lock is NULL, then ASSERT().
If Lock is not initialized, then ASSERT().
If Lock is already in the released state, then ASSERT().
@param Lock A pointer to the lock to release.
**/
VOID
EFIAPI
EfiReleaseLock (
IN EFI_LOCK *Lock
)
{
EFI_TPL Tpl;
ASSERT (Lock != NULL);
ASSERT (Lock->Lock == EfiLockAcquired);
Tpl = Lock->OwnerTpl;
Lock->Lock = EfiLockReleased;
gBS->RestoreTPL (Tpl);
}
/**
Tests whether a controller handle is being managed by a specific driver.
This function tests whether the driver specified by DriverBindingHandle is
currently managing the controller specified by ControllerHandle. This test
is performed by evaluating if the the protocol specified by ProtocolGuid is
present on ControllerHandle and is was opened by DriverBindingHandle with an
attribute of EFI_OPEN_PROTOCOL_BY_DRIVER.
If ProtocolGuid is NULL, then ASSERT().
@param ControllerHandle A handle for a controller to test.
@param DriverBindingHandle Specifies the driver binding handle for the
driver.
@param ProtocolGuid Specifies the protocol that the driver specified
by DriverBindingHandle opens in its Start()
function.
@retval EFI_SUCCESS ControllerHandle is managed by the driver
specified by DriverBindingHandle.
@retval EFI_UNSUPPORTED ControllerHandle is not managed by the driver
specified by DriverBindingHandle.
**/
EFI_STATUS
EFIAPI
EfiTestManagedDevice (
IN CONST EFI_HANDLE ControllerHandle,
IN CONST EFI_HANDLE DriverBindingHandle,
IN CONST EFI_GUID *ProtocolGuid
)
{
EFI_STATUS Status;
VOID *ManagedInterface;
ASSERT (ProtocolGuid != NULL);
Status = gBS->OpenProtocol (
ControllerHandle,
(EFI_GUID *) ProtocolGuid,
&ManagedInterface,
DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (!EFI_ERROR (Status)) {
gBS->CloseProtocol (
ControllerHandle,
(EFI_GUID *) ProtocolGuid,
DriverBindingHandle,
ControllerHandle
);
return EFI_UNSUPPORTED;
}
if (Status != EFI_ALREADY_STARTED) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/**
Tests whether a child handle is a child device of the controller.
This function tests whether ChildHandle is one of the children of
ControllerHandle. This test is performed by checking to see if the protocol
specified by ProtocolGuid is present on ControllerHandle and opened by
ChildHandle with an attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
If ProtocolGuid is NULL, then ASSERT().
@param ControllerHandle A handle for a (parent) controller to test.
@param ChildHandle A child handle to test.
@param ProtocolGuid Supplies the protocol that the child controller
opens on its parent controller.
@retval EFI_SUCCESS ChildHandle is a child of the ControllerHandle.
@retval EFI_UNSUPPORTED ChildHandle is not a child of the
ControllerHandle.
**/
EFI_STATUS
EFIAPI
EfiTestChildHandle (
IN CONST EFI_HANDLE ControllerHandle,
IN CONST EFI_HANDLE ChildHandle,
IN CONST EFI_GUID *ProtocolGuid
)
{
EFI_STATUS Status;
EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenInfoBuffer;
UINTN EntryCount;
UINTN Index;
ASSERT (ProtocolGuid != NULL);
//
// Retrieve the list of agents that are consuming the specific protocol
// on ControllerHandle.
//
Status = gBS->OpenProtocolInformation (
ControllerHandle,
(EFI_GUID *) ProtocolGuid,
&OpenInfoBuffer,
&EntryCount
);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
//
// Inspect if ChildHandle is one of the agents.
//
Status = EFI_UNSUPPORTED;
for (Index = 0; Index < EntryCount; Index++) {
if ((OpenInfoBuffer[Index].ControllerHandle == ChildHandle) &&
(OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) != 0) {
Status = EFI_SUCCESS;
break;
}
}
FreePool (OpenInfoBuffer);
return Status;
}
/**
This function looks up a Unicode string in UnicodeStringTable.
If Language is a member of SupportedLanguages and a Unicode string is found in
UnicodeStringTable that matches the language code specified by Language, then it
is returned in UnicodeString.
@param Language A pointer to the ISO 639-2 language code for the
Unicode string to look up and return.
@param SupportedLanguages A pointer to the set of ISO 639-2 language codes
that the Unicode string table supports. Language
must be a member of this set.
@param UnicodeStringTable A pointer to the table of Unicode strings.
@param UnicodeString A pointer to the Unicode string from UnicodeStringTable
that matches the language specified by Language.
@retval EFI_SUCCESS The Unicode string that matches the language
specified by Language was found
in the table of Unicode strings UnicodeStringTable,
and it was returned in UnicodeString.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is NULL.
@retval EFI_UNSUPPORTED SupportedLanguages is NULL.
@retval EFI_UNSUPPORTED UnicodeStringTable is NULL.
@retval EFI_UNSUPPORTED The language specified by Language is not a
member of SupportedLanguages.
@retval EFI_UNSUPPORTED The language specified by Language is not
supported by UnicodeStringTable.
**/
EFI_STATUS
EFIAPI
LookupUnicodeString (
IN CONST CHAR8 *Language,
IN CONST CHAR8 *SupportedLanguages,
IN CONST EFI_UNICODE_STRING_TABLE *UnicodeStringTable,
OUT CHAR16 **UnicodeString
)
{
//
// Make sure the parameters are valid
//
if (Language == NULL || UnicodeString == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// If there are no supported languages, or the Unicode String Table is empty, then the
// Unicode String specified by Language is not supported by this Unicode String Table
//
if (SupportedLanguages == NULL || UnicodeStringTable == NULL) {
return EFI_UNSUPPORTED;
}
//
// Make sure Language is in the set of Supported Languages
//
while (*SupportedLanguages != 0) {
if (CompareIso639LanguageCode (Language, SupportedLanguages)) {
//
// Search the Unicode String Table for the matching Language specifier
//
while (UnicodeStringTable->Language != NULL) {
if (CompareIso639LanguageCode (Language, UnicodeStringTable->Language)) {
//
// A matching string was found, so return it
//
*UnicodeString = UnicodeStringTable->UnicodeString;
return EFI_SUCCESS;
}
UnicodeStringTable++;
}
return EFI_UNSUPPORTED;
}
SupportedLanguages += 3;
}
return EFI_UNSUPPORTED;
}
/**
This function looks up a Unicode string in UnicodeStringTable.
If Language is a member of SupportedLanguages and a Unicode string is found in
UnicodeStringTable that matches the language code specified by Language, then
it is returned in UnicodeString.
@param Language A pointer to an ASCII string containing the ISO 639-2 or the
RFC 4646 language code for the Unicode string to look up and
return. If Iso639Language is TRUE, then this ASCII string is
not assumed to be Null-terminated, and only the first three
characters are used. If Iso639Language is FALSE, then this ASCII
string must be Null-terminated.
@param SupportedLanguages A pointer to a Null-terminated ASCII string that contains a
set of ISO 639-2 or RFC 4646 language codes that the Unicode
string table supports. Language must be a member of this set.
If Iso639Language is TRUE, then this string contains one or more
ISO 639-2 language codes with no separator characters. If Iso639Language
is FALSE, then is string contains one or more RFC 4646 language
codes separated by ';'.
@param UnicodeStringTable A pointer to the table of Unicode strings. Type EFI_UNICODE_STRING_TABLE
is defined in "Related Definitions".
@param UnicodeString A pointer to the Null-terminated Unicode string from UnicodeStringTable
that matches the language specified by Language.
@param Iso639Language Specifies the supported language code format. If it is TRUE, then
Language and SupportedLanguages follow ISO 639-2 language code format.
Otherwise, they follow RFC 4646 language code format.
@retval EFI_SUCCESS The Unicode string that matches the language specified by Language
was found in the table of Unicode strings UnicodeStringTable, and
it was returned in UnicodeString.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is NULL.
@retval EFI_UNSUPPORTED SupportedLanguages is NULL.
@retval EFI_UNSUPPORTED UnicodeStringTable is NULL.
@retval EFI_UNSUPPORTED The language specified by Language is not a member of SupportedLanguages.
@retval EFI_UNSUPPORTED The language specified by Language is not supported by UnicodeStringTable.
**/
EFI_STATUS
EFIAPI
LookupUnicodeString2 (
IN CONST CHAR8 *Language,
IN CONST CHAR8 *SupportedLanguages,
IN CONST EFI_UNICODE_STRING_TABLE *UnicodeStringTable,
OUT CHAR16 **UnicodeString,
IN BOOLEAN Iso639Language
)
{
BOOLEAN Found;
UINTN Index;
CHAR8 *LanguageString;
//
// Make sure the parameters are valid
//
if (Language == NULL || UnicodeString == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// If there are no supported languages, or the Unicode String Table is empty, then the
// Unicode String specified by Language is not supported by this Unicode String Table
//
if (SupportedLanguages == NULL || UnicodeStringTable == NULL) {
return EFI_UNSUPPORTED;
}
//
// Make sure Language is in the set of Supported Languages
//
Found = FALSE;
while (*SupportedLanguages != 0) {
if (Iso639Language) {
if (CompareIso639LanguageCode (Language, SupportedLanguages)) {
Found = TRUE;
break;
}
SupportedLanguages += 3;
} else {
for (Index = 0; SupportedLanguages[Index] != 0 && SupportedLanguages[Index] != ';'; Index++);
if ((AsciiStrnCmp(SupportedLanguages, Language, Index) == 0) && (Language[Index] == 0)) {
Found = TRUE;
break;
}
SupportedLanguages += Index;
for (; *SupportedLanguages != 0 && *SupportedLanguages == ';'; SupportedLanguages++);
}
}
//
// If Language is not a member of SupportedLanguages, then return EFI_UNSUPPORTED
//
if (!Found) {
return EFI_UNSUPPORTED;
}
//
// Search the Unicode String Table for the matching Language specifier
//
while (UnicodeStringTable->Language != NULL) {
LanguageString = UnicodeStringTable->Language;
while (0 != *LanguageString) {
for (Index = 0 ;LanguageString[Index] != 0 && LanguageString[Index] != ';'; Index++);
if (AsciiStrnCmp(LanguageString, Language, Index) == 0) {
*UnicodeString = UnicodeStringTable->UnicodeString;
return EFI_SUCCESS;
}
LanguageString += Index;
for (Index = 0 ;LanguageString[Index] != 0 && LanguageString[Index] == ';'; Index++);
}
UnicodeStringTable++;
}
return EFI_UNSUPPORTED;
}
/**
This function adds a Unicode string to UnicodeStringTable.
If Language is a member of SupportedLanguages then UnicodeString is added to
UnicodeStringTable. New buffers are allocated for both Language and
UnicodeString. The contents of Language and UnicodeString are copied into
these new buffers. These buffers are automatically freed when
FreeUnicodeStringTable() is called.
@param Language A pointer to the ISO 639-2 language code for the Unicode
string to add.
@param SupportedLanguages A pointer to the set of ISO 639-2 language codes
that the Unicode string table supports.
Language must be a member of this set.
@param UnicodeStringTable A pointer to the table of Unicode strings.
@param UnicodeString A pointer to the Unicode string to add.
@retval EFI_SUCCESS The Unicode string that matches the language
specified by Language was found in the table of
Unicode strings UnicodeStringTable, and it was
returned in UnicodeString.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is an empty string.
@retval EFI_UNSUPPORTED SupportedLanguages is NULL.
@retval EFI_ALREADY_STARTED A Unicode string with language Language is
already present in UnicodeStringTable.
@retval EFI_OUT_OF_RESOURCES There is not enough memory to add another
Unicode string to UnicodeStringTable.
@retval EFI_UNSUPPORTED The language specified by Language is not a
member of SupportedLanguages.
**/
EFI_STATUS
EFIAPI
AddUnicodeString (
IN CONST CHAR8 *Language,
IN CONST CHAR8 *SupportedLanguages,
IN OUT EFI_UNICODE_STRING_TABLE **UnicodeStringTable,
IN CONST CHAR16 *UnicodeString
)
{
UINTN NumberOfEntries;
EFI_UNICODE_STRING_TABLE *OldUnicodeStringTable;
EFI_UNICODE_STRING_TABLE *NewUnicodeStringTable;
UINTN UnicodeStringLength;
//
// Make sure the parameter are valid
//
if (Language == NULL || UnicodeString == NULL || UnicodeStringTable == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// If there are no supported languages, then a Unicode String can not be added
//
if (SupportedLanguages == NULL) {
return EFI_UNSUPPORTED;
}
//
// If the Unicode String is empty, then a Unicode String can not be added
//
if (UnicodeString[0] == 0) {
return EFI_INVALID_PARAMETER;
}
//
// Make sure Language is a member of SupportedLanguages
//
while (*SupportedLanguages != 0) {
if (CompareIso639LanguageCode (Language, SupportedLanguages)) {
//
// Determine the size of the Unicode String Table by looking for a NULL Language entry
//
NumberOfEntries = 0;
if (*UnicodeStringTable != NULL) {
OldUnicodeStringTable = *UnicodeStringTable;
while (OldUnicodeStringTable->Language != NULL) {
if (CompareIso639LanguageCode (Language, OldUnicodeStringTable->Language)) {
return EFI_ALREADY_STARTED;
}
OldUnicodeStringTable++;
NumberOfEntries++;
}
}
//
// Allocate space for a new Unicode String Table. It must hold the current number of
// entries, plus 1 entry for the new Unicode String, plus 1 entry for the end of table
// marker
//
NewUnicodeStringTable = AllocatePool ((NumberOfEntries + 2) * sizeof (EFI_UNICODE_STRING_TABLE));
if (NewUnicodeStringTable == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// If the current Unicode String Table contains any entries, then copy them to the
// newly allocated Unicode String Table.
//
if (*UnicodeStringTable != NULL) {
CopyMem (
NewUnicodeStringTable,
*UnicodeStringTable,
NumberOfEntries * sizeof (EFI_UNICODE_STRING_TABLE)
);
}
//
// Allocate space for a copy of the Language specifier
//
NewUnicodeStringTable[NumberOfEntries].Language = AllocateCopyPool (3, Language);
if (NewUnicodeStringTable[NumberOfEntries].Language == NULL) {
FreePool (NewUnicodeStringTable);
return EFI_OUT_OF_RESOURCES;
}
//
// Compute the length of the Unicode String
//
for (UnicodeStringLength = 0; UnicodeString[UnicodeStringLength] != 0; UnicodeStringLength++)
;
//
// Allocate space for a copy of the Unicode String
//
NewUnicodeStringTable[NumberOfEntries].UnicodeString = AllocateCopyPool (
(UnicodeStringLength + 1) * sizeof (CHAR16),
UnicodeString
);
if (NewUnicodeStringTable[NumberOfEntries].UnicodeString == NULL) {
FreePool (NewUnicodeStringTable[NumberOfEntries].Language);
FreePool (NewUnicodeStringTable);
return EFI_OUT_OF_RESOURCES;
}
//
// Mark the end of the Unicode String Table
//
NewUnicodeStringTable[NumberOfEntries + 1].Language = NULL;
NewUnicodeStringTable[NumberOfEntries + 1].UnicodeString = NULL;
//
// Free the old Unicode String Table
//
if (*UnicodeStringTable != NULL) {
FreePool (*UnicodeStringTable);
}
//
// Point UnicodeStringTable at the newly allocated Unicode String Table
//
*UnicodeStringTable = NewUnicodeStringTable;
return EFI_SUCCESS;
}
SupportedLanguages += 3;
}
return EFI_UNSUPPORTED;
}
/**
This function adds the Null-terminated Unicode string specified by UnicodeString
to UnicodeStringTable.
If Language is a member of SupportedLanguages then UnicodeString is added to
UnicodeStringTable. New buffers are allocated for both Language and UnicodeString.
The contents of Language and UnicodeString are copied into these new buffers.
These buffers are automatically freed when EfiLibFreeUnicodeStringTable() is called.
@param Language A pointer to an ASCII string containing the ISO 639-2 or
the RFC 4646 language code for the Unicode string to add.
If Iso639Language is TRUE, then this ASCII string is not
assumed to be Null-terminated, and only the first three
chacters are used. If Iso639Language is FALSE, then this
ASCII string must be Null-terminated.
@param SupportedLanguages A pointer to a Null-terminated ASCII string that contains
a set of ISO 639-2 or RFC 4646 language codes that the Unicode
string table supports. Language must be a member of this set.
If Iso639Language is TRUE, then this string contains one or more
ISO 639-2 language codes with no separator characters.
If Iso639Language is FALSE, then is string contains one or more
RFC 4646 language codes separated by ';'.
@param UnicodeStringTable A pointer to the table of Unicode strings. Type EFI_UNICODE_STRING_TABLE
is defined in "Related Definitions".
@param UnicodeString A pointer to the Unicode string to add.
@param Iso639Language Specifies the supported language code format. If it is TRUE,
then Language and SupportedLanguages follow ISO 639-2 language code format.
Otherwise, they follow RFC 4646 language code format.
@retval EFI_SUCCESS The Unicode string that matches the language specified by
Language was found in the table of Unicode strings UnicodeStringTable,
and it was returned in UnicodeString.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is NULL.
@retval EFI_INVALID_PARAMETER UnicodeString is an empty string.
@retval EFI_UNSUPPORTED SupportedLanguages is NULL.
@retval EFI_ALREADY_STARTED A Unicode string with language Language is already present in
UnicodeStringTable.
@retval EFI_OUT_OF_RESOURCES There is not enough memory to add another Unicode string UnicodeStringTable.
@retval EFI_UNSUPPORTED The language specified by Language is not a member of SupportedLanguages.
**/
EFI_STATUS
EFIAPI
AddUnicodeString2 (
IN CONST CHAR8 *Language,
IN CONST CHAR8 *SupportedLanguages,
IN OUT EFI_UNICODE_STRING_TABLE **UnicodeStringTable,
IN CONST CHAR16 *UnicodeString,
IN BOOLEAN Iso639Language
)
{
UINTN NumberOfEntries;
EFI_UNICODE_STRING_TABLE *OldUnicodeStringTable;
EFI_UNICODE_STRING_TABLE *NewUnicodeStringTable;
UINTN UnicodeStringLength;
BOOLEAN Found;
UINTN Index;
CHAR8 *LanguageString;
//
// Make sure the parameter are valid
//
if (Language == NULL || UnicodeString == NULL || UnicodeStringTable == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// If there are no supported languages, then a Unicode String can not be added
//
if (SupportedLanguages == NULL) {
return EFI_UNSUPPORTED;
}
//
// If the Unicode String is empty, then a Unicode String can not be added
//
if (UnicodeString[0] == 0) {
return EFI_INVALID_PARAMETER;
}
//
// Make sure Language is a member of SupportedLanguages
//
Found = FALSE;
while (*SupportedLanguages != 0) {
if (Iso639Language) {
if (CompareIso639LanguageCode (Language, SupportedLanguages)) {
Found = TRUE;
break;
}
SupportedLanguages += 3;
} else {
for (Index = 0; SupportedLanguages[Index] != 0 && SupportedLanguages[Index] != ';'; Index++);
if (AsciiStrnCmp(SupportedLanguages, Language, Index) == 0) {
Found = TRUE;
break;
}
SupportedLanguages += Index;
for (; *SupportedLanguages != 0 && *SupportedLanguages == ';'; SupportedLanguages++);
}
}
//
// If Language is not a member of SupportedLanguages, then return EFI_UNSUPPORTED
//
if (!Found) {
return EFI_UNSUPPORTED;
}
//
// Determine the size of the Unicode String Table by looking for a NULL Language entry
//
NumberOfEntries = 0;
if (*UnicodeStringTable != NULL) {
OldUnicodeStringTable = *UnicodeStringTable;
while (OldUnicodeStringTable->Language != NULL) {
LanguageString = OldUnicodeStringTable->Language;
while (*LanguageString != 0) {
for (Index = 0; LanguageString[Index] != 0 && LanguageString[Index] != ';'; Index++);
if (AsciiStrnCmp (Language, LanguageString, Index) == 0) {
return EFI_ALREADY_STARTED;
}
LanguageString += Index;
for (; *LanguageString != 0 && *LanguageString == ';'; LanguageString++);
}
OldUnicodeStringTable++;
NumberOfEntries++;
}
}
//
// Allocate space for a new Unicode String Table. It must hold the current number of
// entries, plus 1 entry for the new Unicode String, plus 1 entry for the end of table
// marker
//
NewUnicodeStringTable = AllocatePool ((NumberOfEntries + 2) * sizeof (EFI_UNICODE_STRING_TABLE));
if (NewUnicodeStringTable == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// If the current Unicode String Table contains any entries, then copy them to the
// newly allocated Unicode String Table.
//
if (*UnicodeStringTable != NULL) {
CopyMem (
NewUnicodeStringTable,
*UnicodeStringTable,
NumberOfEntries * sizeof (EFI_UNICODE_STRING_TABLE)
);
}
//
// Allocate space for a copy of the Language specifier
//
NewUnicodeStringTable[NumberOfEntries].Language = AllocateCopyPool (AsciiStrSize(Language), Language);
if (NewUnicodeStringTable[NumberOfEntries].Language == NULL) {
FreePool (NewUnicodeStringTable);
return EFI_OUT_OF_RESOURCES;
}
//
// Compute the length of the Unicode String
//
for (UnicodeStringLength = 0; UnicodeString[UnicodeStringLength] != 0; UnicodeStringLength++);
//
// Allocate space for a copy of the Unicode String
//
NewUnicodeStringTable[NumberOfEntries].UnicodeString = AllocateCopyPool (StrSize (UnicodeString), UnicodeString);
if (NewUnicodeStringTable[NumberOfEntries].UnicodeString == NULL) {
FreePool (NewUnicodeStringTable[NumberOfEntries].Language);
FreePool (NewUnicodeStringTable);
return EFI_OUT_OF_RESOURCES;
}
//
// Mark the end of the Unicode String Table
//
NewUnicodeStringTable[NumberOfEntries + 1].Language = NULL;
NewUnicodeStringTable[NumberOfEntries + 1].UnicodeString = NULL;
//
// Free the old Unicode String Table
//
if (*UnicodeStringTable != NULL) {
FreePool (*UnicodeStringTable);
}
//
// Point UnicodeStringTable at the newly allocated Unicode String Table
//
*UnicodeStringTable = NewUnicodeStringTable;
return EFI_SUCCESS;
}
/**
This function frees the table of Unicode strings in UnicodeStringTable.
If UnicodeStringTable is NULL, then EFI_SUCCESS is returned.
Otherwise, each language code, and each Unicode string in the Unicode string
table are freed, and EFI_SUCCESS is returned.
@param UnicodeStringTable A pointer to the table of Unicode strings.
@retval EFI_SUCCESS The Unicode string table was freed.
**/
EFI_STATUS
EFIAPI
FreeUnicodeStringTable (
IN EFI_UNICODE_STRING_TABLE *UnicodeStringTable
)
{
UINTN Index;
//
// If the Unicode String Table is NULL, then it is already freed
//
if (UnicodeStringTable == NULL) {
return EFI_SUCCESS;
}
//
// Loop through the Unicode String Table until we reach the end of table marker
//
for (Index = 0; UnicodeStringTable[Index].Language != NULL; Index++) {
//
// Free the Language string from the Unicode String Table
//
FreePool (UnicodeStringTable[Index].Language);
//
// Free the Unicode String from the Unicode String Table
//
if (UnicodeStringTable[Index].UnicodeString != NULL) {
FreePool (UnicodeStringTable[Index].UnicodeString);
}
}
//
// Free the Unicode String Table itself
//
FreePool (UnicodeStringTable);
return EFI_SUCCESS;
}
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function will be deprecated for security reason.
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). The
returned buffer is allocated using AllocatePool(). The caller is responsible
for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
If Guid is NULL, then ASSERT().
@param[in] Name The pointer to a Null-terminated Unicode string.
@param[in] Guid The pointer to an EFI_GUID structure
@retval NULL The variable could not be retrieved.
@retval NULL There are not enough resources available for the variable contents.
@retval Other A pointer to allocated buffer containing the variable contents.
**/
VOID *
EFIAPI
GetVariable (
IN CONST CHAR16 *Name,
IN CONST EFI_GUID *Guid
)
{
EFI_STATUS Status;
UINTN Size;
VOID *Value;
ASSERT (Name != NULL);
ASSERT (Guid != NULL);
//
// Try to get the variable size.
//
Value = NULL;
Size = 0;
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &Size, Value);
if (Status != EFI_BUFFER_TOO_SMALL) {
return NULL;
}
//
// Allocate buffer to get the variable.
//
Value = AllocatePool (Size);
if (Value == NULL) {
return NULL;
}
//
// Get the variable data.
//
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &Size, Value);
if (EFI_ERROR (Status)) {
FreePool(Value);
return NULL;
}
return Value;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). This
function always uses the EFI_GLOBAL_VARIABLE GUID to retrieve variables.
The returned buffer is allocated using AllocatePool(). The caller is
responsible for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
@param[in] Name The pointer to a Null-terminated Unicode string.
@retval NULL The variable could not be retrieved.
@retval NULL There are not enough resources available for the variable contents.
@retval Other A pointer to allocated buffer containing the variable contents.
**/
VOID *
EFIAPI
GetEfiGlobalVariable (
IN CONST CHAR16 *Name
)
{
return GetVariable (Name, &gEfiGlobalVariableGuid);
}
#endif
/**
Returns the status whether get the variable success. The function retrieves
variable through the UEFI Runtime Service GetVariable(). The
returned buffer is allocated using AllocatePool(). The caller is responsible
for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
If Guid is NULL, then ASSERT().
If Value is NULL, then ASSERT().
@param[in] Name The pointer to a Null-terminated Unicode string.
@param[in] Guid The pointer to an EFI_GUID structure
@param[out] Value The buffer point saved the variable info.
@param[out] Size The buffer size of the variable.
@return EFI_OUT_OF_RESOURCES Allocate buffer failed.
@return EFI_SUCCESS Find the specified variable.
@return Others Errors Return errors from call to gRT->GetVariable.
**/
EFI_STATUS
EFIAPI
GetVariable2 (
IN CONST CHAR16 *Name,
IN CONST EFI_GUID *Guid,
OUT VOID **Value,
OUT UINTN *Size OPTIONAL
)
{
EFI_STATUS Status;
UINTN BufferSize;
ASSERT (Name != NULL && Guid != NULL && Value != NULL);
//
// Try to get the variable size.
//
BufferSize = 0;
*Value = NULL;
if (Size != NULL) {
*Size = 0;
}
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &BufferSize, *Value);
if (Status != EFI_BUFFER_TOO_SMALL) {
return Status;
}
//
// Allocate buffer to get the variable.
//
*Value = AllocatePool (BufferSize);
ASSERT (*Value != NULL);
if (*Value == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Get the variable data.
//
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &BufferSize, *Value);
if (EFI_ERROR (Status)) {
FreePool(*Value);
*Value = NULL;
}
if (Size != NULL) {
*Size = BufferSize;
}
return Status;
}
/** Return the attributes of the variable.
Returns the status whether get the variable success. The function retrieves
variable through the UEFI Runtime Service GetVariable(). The
returned buffer is allocated using AllocatePool(). The caller is responsible
for freeing this buffer with FreePool(). The attributes are returned if
the caller provides a valid Attribute parameter.
If Name is NULL, then ASSERT().
If Guid is NULL, then ASSERT().
If Value is NULL, then ASSERT().
@param[in] Name The pointer to a Null-terminated Unicode string.
@param[in] Guid The pointer to an EFI_GUID structure
@param[out] Value The buffer point saved the variable info.
@param[out] Size The buffer size of the variable.
@param[out] Attr The pointer to the variable attributes as found in var store
@retval EFI_OUT_OF_RESOURCES Allocate buffer failed.
@retval EFI_SUCCESS Find the specified variable.
@retval Others Errors Return errors from call to gRT->GetVariable.
**/
EFI_STATUS
EFIAPI
GetVariable3(
IN CONST CHAR16 *Name,
IN CONST EFI_GUID *Guid,
OUT VOID **Value,
OUT UINTN *Size OPTIONAL,
OUT UINT32 *Attr OPTIONAL
)
{
EFI_STATUS Status;
UINTN BufferSize;
ASSERT(Name != NULL && Guid != NULL && Value != NULL);
//
// Try to get the variable size.
//
BufferSize = 0;
*Value = NULL;
if (Size != NULL) {
*Size = 0;
}
if (Attr != NULL) {
*Attr = 0;
}
Status = gRT->GetVariable((CHAR16 *)Name, (EFI_GUID *)Guid, Attr, &BufferSize, *Value);
if (Status != EFI_BUFFER_TOO_SMALL) {
return Status;
}
//
// Allocate buffer to get the variable.
//
*Value = AllocatePool(BufferSize);
ASSERT(*Value != NULL);
if (*Value == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Get the variable data.
//
Status = gRT->GetVariable((CHAR16 *)Name, (EFI_GUID *)Guid, Attr, &BufferSize, *Value);
if (EFI_ERROR(Status)) {
FreePool(*Value);
*Value = NULL;
}
if (Size != NULL) {
*Size = BufferSize;
}
return Status;
}
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). This
function always uses the EFI_GLOBAL_VARIABLE GUID to retrieve variables.
The returned buffer is allocated using AllocatePool(). The caller is
responsible for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
If Value is NULL, then ASSERT().
@param[in] Name The pointer to a Null-terminated Unicode string.
@param[out] Value The buffer point saved the variable info.
@param[out] Size The buffer size of the variable.
@return EFI_OUT_OF_RESOURCES Allocate buffer failed.
@return EFI_SUCCESS Find the specified variable.
@return Others Errors Return errors from call to gRT->GetVariable.
**/
EFI_STATUS
EFIAPI
GetEfiGlobalVariable2 (
IN CONST CHAR16 *Name,
OUT VOID **Value,
OUT UINTN *Size OPTIONAL
)
{
return GetVariable2 (Name, &gEfiGlobalVariableGuid, Value, Size);
}
/**
Returns a pointer to an allocated buffer that contains the best matching language
from a set of supported languages.
This function supports both ISO 639-2 and RFC 4646 language codes, but language
code types may not be mixed in a single call to this function. The language
code returned is allocated using AllocatePool(). The caller is responsible for
freeing the allocated buffer using FreePool(). This function supports a variable
argument list that allows the caller to pass in a prioritized list of language
codes to test against all the language codes in SupportedLanguages.
If SupportedLanguages is NULL, then ASSERT().
@param[in] SupportedLanguages A pointer to a Null-terminated ASCII string that
contains a set of language codes in the format
specified by Iso639Language.
@param[in] Iso639Language If not zero, then all language codes are assumed to be
in ISO 639-2 format. If zero, then all language
codes are assumed to be in RFC 4646 language format
@param[in] ... A variable argument list that contains pointers to
Null-terminated ASCII strings that contain one or more
language codes in the format specified by Iso639Language.
The first language code from each of these language
code lists is used to determine if it is an exact or
close match to any of the language codes in
SupportedLanguages. Close matches only apply to RFC 4646
language codes, and the matching algorithm from RFC 4647
is used to determine if a close match is present. If
an exact or close match is found, then the matching
language code from SupportedLanguages is returned. If
no matches are found, then the next variable argument
parameter is evaluated. The variable argument list
is terminated by a NULL.
@retval NULL The best matching language could not be found in SupportedLanguages.
@retval NULL There are not enough resources available to return the best matching
language.
@retval Other A pointer to a Null-terminated ASCII string that is the best matching
language in SupportedLanguages.
**/
CHAR8 *
EFIAPI
GetBestLanguage (
IN CONST CHAR8 *SupportedLanguages,
IN UINTN Iso639Language,
...
)
{
VA_LIST Args;
CHAR8 *Language;
UINTN CompareLength;
UINTN LanguageLength;
CONST CHAR8 *Supported;
CHAR8 *BestLanguage;
ASSERT (SupportedLanguages != NULL);
VA_START (Args, Iso639Language);
while ((Language = VA_ARG (Args, CHAR8 *)) != NULL) {
//
// Default to ISO 639-2 mode
//
CompareLength = 3;
LanguageLength = MIN (3, AsciiStrLen (Language));
//
// If in RFC 4646 mode, then determine the length of the first RFC 4646 language code in Language
//
if (Iso639Language == 0) {
for (LanguageLength = 0; Language[LanguageLength] != 0 && Language[LanguageLength] != ';'; LanguageLength++);
}
//
// Trim back the length of Language used until it is empty
//
while (LanguageLength > 0) {
//
// Loop through all language codes in SupportedLanguages
//
for (Supported = SupportedLanguages; *Supported != '\0'; Supported += CompareLength) {
//
// In RFC 4646 mode, then Loop through all language codes in SupportedLanguages
//
if (Iso639Language == 0) {
//
// Skip ';' characters in Supported
//
for (; *Supported != '\0' && *Supported == ';'; Supported++);
//
// Determine the length of the next language code in Supported
//
for (CompareLength = 0; Supported[CompareLength] != 0 && Supported[CompareLength] != ';'; CompareLength++);
//
// If Language is longer than the Supported, then skip to the next language
//
if (LanguageLength > CompareLength) {
continue;
}
}
//
// See if the first LanguageLength characters in Supported match Language
//
if (AsciiStrnCmp (Supported, Language, LanguageLength) == 0) {
VA_END (Args);
//
// Allocate, copy, and return the best matching language code from SupportedLanguages
//
BestLanguage = AllocateZeroPool (CompareLength + 1);
if (BestLanguage == NULL) {
return NULL;
}
return CopyMem (BestLanguage, Supported, CompareLength);
}
}
if (Iso639Language != 0) {
//
// If ISO 639 mode, then each language can only be tested once
//
LanguageLength = 0;
} else {
//
// If RFC 4646 mode, then trim Language from the right to the next '-' character
//
for (LanguageLength--; LanguageLength > 0 && Language[LanguageLength] != '-'; LanguageLength--);
}
}
}
VA_END (Args);
//
// No matches were found
//
return NULL;
}
/**
Returns an array of protocol instance that matches the given protocol.
@param[in] Protocol Provides the protocol to search for.
@param[out] NoProtocols The number of protocols returned in Buffer.
@param[out] Buffer A pointer to the buffer to return the requested
array of protocol instances that match Protocol.
The returned buffer is allocated using
EFI_BOOT_SERVICES.AllocatePool(). The caller is
responsible for freeing this buffer with
EFI_BOOT_SERVICES.FreePool().
@retval EFI_SUCCESS The array of protocols was returned in Buffer,
and the number of protocols in Buffer was
returned in NoProtocols.
@retval EFI_NOT_FOUND No protocols found.
@retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the
matching results.
@retval EFI_INVALID_PARAMETER Protocol is NULL.
@retval EFI_INVALID_PARAMETER NoProtocols is NULL.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
**/
EFI_STATUS
EFIAPI
EfiLocateProtocolBuffer (
IN EFI_GUID *Protocol,
OUT UINTN *NoProtocols,
OUT VOID ***Buffer
)
{
EFI_STATUS Status;
UINTN NoHandles;
EFI_HANDLE *HandleBuffer;
UINTN Index;
//
// Check input parameters
//
if (Protocol == NULL || NoProtocols == NULL || Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Initialze output parameters
//
*NoProtocols = 0;
*Buffer = NULL;
//
// Retrieve the array of handles that support Protocol
//
Status = gBS->LocateHandleBuffer (
ByProtocol,
Protocol,
NULL,
&NoHandles,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Allocate array of protocol instances
//
Status = gBS->AllocatePool (
EfiBootServicesData,
NoHandles * sizeof (VOID *),
(VOID **)Buffer
);
if (EFI_ERROR (Status)) {
//
// Free the handle buffer
//
gBS->FreePool (HandleBuffer);
return EFI_OUT_OF_RESOURCES;
}
ZeroMem (*Buffer, NoHandles * sizeof (VOID *));
//
// Lookup Protocol on each handle in HandleBuffer to fill in the array of
// protocol instances. Handle case where protocol instance was present when
// LocateHandleBuffer() was called, but is not present when HandleProtocol()
// is called.
//
for (Index = 0, *NoProtocols = 0; Index < NoHandles; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
Protocol,
&((*Buffer)[*NoProtocols])
);
if (!EFI_ERROR (Status)) {
(*NoProtocols)++;
}
}
//
// Free the handle buffer
//
gBS->FreePool (HandleBuffer);
//
// Make sure at least one protocol instance was found
//
if (*NoProtocols == 0) {
gBS->FreePool (*Buffer);
*Buffer = NULL;
return EFI_NOT_FOUND;
}
return EFI_SUCCESS;
}
/**
Open or create a file or directory, possibly creating the chain of
directories leading up to the directory.
EfiOpenFileByDevicePath() first locates EFI_SIMPLE_FILE_SYSTEM_PROTOCOL on
FilePath, and opens the root directory of that filesystem with
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume().
On the remaining device path, the longest initial sequence of
FILEPATH_DEVICE_PATH nodes is node-wise traversed with
EFI_FILE_PROTOCOL.Open().
(As a consequence, if OpenMode includes EFI_FILE_MODE_CREATE, and Attributes
includes EFI_FILE_DIRECTORY, and each FILEPATH_DEVICE_PATH specifies a single
pathname component, then EfiOpenFileByDevicePath() ensures that the specified
series of subdirectories exist on return.)
The EFI_FILE_PROTOCOL identified by the last FILEPATH_DEVICE_PATH node is
output to the caller; intermediate EFI_FILE_PROTOCOL instances are closed. If
there are no FILEPATH_DEVICE_PATH nodes past the node that identifies the
filesystem, then the EFI_FILE_PROTOCOL of the root directory of the
filesystem is output to the caller. If a device path node that is different
from FILEPATH_DEVICE_PATH is encountered relative to the filesystem, the
traversal is stopped with an error, and a NULL EFI_FILE_PROTOCOL is output.
@param[in,out] FilePath On input, the device path to the file or directory
to open or create. The caller is responsible for
ensuring that the device path pointed-to by FilePath
is well-formed. On output, FilePath points one past
the last node in the original device path that has
been successfully processed. FilePath is set on
output even if EfiOpenFileByDevicePath() returns an
error.
@param[out] File On error, File is set to NULL. On success, File is
set to the EFI_FILE_PROTOCOL of the root directory
of the filesystem, if there are no
FILEPATH_DEVICE_PATH nodes in FilePath; otherwise,
File is set to the EFI_FILE_PROTOCOL identified by
the last node in FilePath.
@param[in] OpenMode The OpenMode parameter to pass to
EFI_FILE_PROTOCOL.Open().
@param[in] Attributes The Attributes parameter to pass to
EFI_FILE_PROTOCOL.Open().
@retval EFI_SUCCESS The file or directory has been opened or
created.
@retval EFI_INVALID_PARAMETER FilePath is NULL; or File is NULL; or FilePath
contains a device path node, past the node
that identifies
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL, that is not a
FILEPATH_DEVICE_PATH node.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@return Error codes propagated from the
LocateDevicePath() and OpenProtocol() boot
services, and from the
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume()
and EFI_FILE_PROTOCOL.Open() member functions.
**/
EFI_STATUS
EFIAPI
EfiOpenFileByDevicePath (
IN OUT EFI_DEVICE_PATH_PROTOCOL **FilePath,
OUT EFI_FILE_PROTOCOL **File,
IN UINT64 OpenMode,
IN UINT64 Attributes
)
{
EFI_STATUS Status;
EFI_HANDLE FileSystemHandle;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *FileSystem;
EFI_FILE_PROTOCOL *LastFile;
FILEPATH_DEVICE_PATH *FilePathNode;
CHAR16 *AlignedPathName;
CHAR16 *PathName;
EFI_FILE_PROTOCOL *NextFile;
if (File == NULL) {
return EFI_INVALID_PARAMETER;
}
*File = NULL;
if (FilePath == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Look up the filesystem.
//
Status = gBS->LocateDevicePath (
&gEfiSimpleFileSystemProtocolGuid,
FilePath,
&FileSystemHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->OpenProtocol (
FileSystemHandle,
&gEfiSimpleFileSystemProtocolGuid,
(VOID **)&FileSystem,
gImageHandle,
NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Open the root directory of the filesystem. After this operation succeeds,
// we have to release LastFile on error.
//
Status = FileSystem->OpenVolume (FileSystem, &LastFile);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Traverse the device path nodes relative to the filesystem.
//
while (!IsDevicePathEnd (*FilePath)) {
if (DevicePathType (*FilePath) != MEDIA_DEVICE_PATH ||
DevicePathSubType (*FilePath) != MEDIA_FILEPATH_DP) {
Status = EFI_INVALID_PARAMETER;
goto CloseLastFile;
}
FilePathNode = (FILEPATH_DEVICE_PATH *)*FilePath;
//
// FilePathNode->PathName may be unaligned, and the UEFI specification
// requires pointers that are passed to protocol member functions to be
// aligned. Create an aligned copy of the pathname if necessary.
//
if ((UINTN)FilePathNode->PathName % sizeof *FilePathNode->PathName == 0) {
AlignedPathName = NULL;
PathName = FilePathNode->PathName;
} else {
AlignedPathName = AllocateCopyPool (
(DevicePathNodeLength (FilePathNode) -
SIZE_OF_FILEPATH_DEVICE_PATH),
FilePathNode->PathName
);
if (AlignedPathName == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto CloseLastFile;
}
PathName = AlignedPathName;
}
//
// Open or create the file corresponding to the next pathname fragment.
//
Status = LastFile->Open (
LastFile,
&NextFile,
PathName,
OpenMode,
Attributes
);
//
// Release any AlignedPathName on both error and success paths; PathName is
// no longer needed.
//
if (AlignedPathName != NULL) {
FreePool (AlignedPathName);
}
if (EFI_ERROR (Status)) {
goto CloseLastFile;
}
//
// Advance to the next device path node.
//
LastFile->Close (LastFile);
LastFile = NextFile;
*FilePath = NextDevicePathNode (FilePathNode);
}
*File = LastFile;
return EFI_SUCCESS;
CloseLastFile:
LastFile->Close (LastFile);
//
// We are on the error path; we must have set an error Status for returning
// to the caller.
//
ASSERT (EFI_ERROR (Status));
return Status;
}
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