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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 - 2007, Intel Corporation<BR>
All rights reserved. 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 "UefiLibInternal.h"
/**
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 Pointer to table's GUID type..
@param Table 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.
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 notifactions 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 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 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;
}
/**
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().
@param VOID
@retval EFI_TPL 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 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. If the lock is already owned , then an error is returned.
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 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
specifed by DriverBindingHandle.
@retval EFI_UNSUPPORTED ControllerHandle is not managed by the driver
specifed 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 Unicoide 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 the ISO 639-2 or
RFC 3066 language code for the
Unicode string to look up and
return.
@param SupportedLanguages A pointer to the set of ISO
639-2 or RFC 3066 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.
@param Iso639Language Specify the language code
format supported. If true,
then the format follow ISO
639-2. If false, then it
follows RFC3066.
@retval EFI_SUCCESS The Unicode string that
matches the language specified
by Language was found in the
table of Unicoide 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
ofSupportedLanguages.
@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 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) {
gBS->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) {
gBS->FreePool (NewUnicodeStringTable[NumberOfEntries].Language);
gBS->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) {
gBS->FreePool (*UnicodeStringTable);
}
//
// Point UnicodeStringTable at the newly allocated Unicode String Table
//
*UnicodeStringTable = NewUnicodeStringTable;
return EFI_SUCCESS;
}
SupportedLanguages += 3;
}
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 or
RFC 3066 language code for the
Unicode string to add.
@param SupportedLanguages A pointer to the set of ISO
639-2 or RFC 3066 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.
@param Iso639Language Specify the language code
format supported. If true,
then the format follow ISO
639-2. If false, then it
follows RFC3066.
@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
AddUnicodeString2 (
IN CONST CHAR8 *Language,
IN CONST CHAR8 *SupportedLanguages,
IN 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) {
gBS->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) {
gBS->FreePool (NewUnicodeStringTable[NumberOfEntries].Language);
gBS->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) {
gBS->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
//
gBS->FreePool (UnicodeStringTable[Index].Language);
//
// Free the Unicode String from the Unicode String Table
//
if (UnicodeStringTable[Index].UnicodeString != NULL) {
gBS->FreePool (UnicodeStringTable[Index].UnicodeString);
}
}
//
// Free the Unicode String Table itself
//
gBS->FreePool (UnicodeStringTable);
return EFI_SUCCESS;
}
/**
Determine what is the current language setting. The space reserved for Lang
must be at least RFC_3066_ENTRY_SIZE bytes;
If Lang is NULL, then ASSERT.
@param Lang Pointer of system language. Lang will always be filled with a valid RFC 3066
language string. If "PlatformLang" is not set in the system, the default
language specifed by PcdUefiVariableDefaultPlatformLang is returned.
@return EFI_SUCCESS If the EFI Variable with "PlatformLang" is set and return in Lang.
@return EFI_NOT_FOUND If the EFI Variable with "PlatformLang" is not set, but a valid default language is return in Lang.
**/
EFI_STATUS
EFIAPI
GetCurrentLanguage (
OUT CHAR8 *Lang
)
{
EFI_STATUS Status;
UINTN Size;
ASSERT (Lang != NULL);
//
// Get current language setting
//
Size = RFC_3066_ENTRY_SIZE;
Status = gRT->GetVariable (
L"PlatformLang",
&gEfiGlobalVariableGuid,
NULL,
&Size,
Lang
);
if (EFI_ERROR (Status)) {
AsciiStrCpy (Lang, (CHAR8 *) PcdGetPtr (PcdUefiVariableDefaultPlatformLang));
}
return Status;
}
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