audk/MdePkg/Library/DxeServicesLib/DxeServicesLib.c

395 lines
16 KiB
C

/** @file
MDE DXE Services Library provides functions that simplify the development of DXE Drivers.
These functions help access data from sections of FFS files.
Copyright (c) 2007 - 2008, 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 <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesLib.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/LoadedImage.h>
/**
Identify the device handle from which the Image is loaded from. As this device handle is passed to
GetSectionFromFv as the identifier for a Firmware Volume, an EFI_FIRMWARE_VOLUME2_PROTOCOL
protocol instance should be located succesfully by calling gBS->HandleProtocol ().
This function locates the EFI_LOADED_IMAGE_PROTOCOL instance installed
on ImageHandle. It then returns EFI_LOADED_IMAGE_PROTOCOL.DeviceHandle.
If ImageHandle is NULL, then ASSERT ();
If failed to locate a EFI_LOADED_IMAGE_PROTOCOL on ImageHandle, then ASSERT ();
@param ImageHandle The firmware allocated handle for UEFI image.
@retval EFI_HANDLE The device handle from which the Image is loaded from.
**/
EFI_HANDLE
InternalImageHandleToFvHandle (
EFI_HANDLE ImageHandle
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
ASSERT (ImageHandle != NULL);
Status = gBS->HandleProtocol (
(EFI_HANDLE *) ImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **) &LoadedImage
);
ASSERT_EFI_ERROR (Status);
return LoadedImage->DeviceHandle;
}
/**
Allocate and fill a buffer from a Firmware Section identified by a Firmware File GUID name, a Firmware
Section type and instance number from the specified Firmware Volume.
This functions first locate the EFI_FIRMWARE_VOLUME2_PROTOCOL protocol instance on FvHandle in order to
carry out the Firmware Volume read operation. The function then reads the Firmware Section found sepcifed
by NameGuid, SectionType and SectionInstance.
The details of this search order is defined in description of EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection ()
found in PI Specification.
If SectionType is EFI_SECTION_TE, EFI_SECTION_TE is used as section type to start the search. If EFI_SECTION_TE section
is not found, EFI_SECTION_PE32 will be used to try the search again. If no EFI_SECTION_PE32 section is found, EFI_NOT_FOUND
is returned.
The data and size is returned by Buffer and Size. The caller is responsible to free the Buffer allocated
by this function. This function can be only called at TPL_NOTIFY and below.
If FvHandle is NULL, then ASSERT ();
If NameGuid is NULL, then ASSERT();
If Buffer is NULL, then ASSERT();
If Size is NULL, then ASSERT().
@param FvHandle The device handle that contains a instance of EFI_FIRMWARE_VOLUME2_PROTOCOL instance.
@param NameGuid The GUID name of a Firmware File.
@param SectionType The Firmware Section type.
@param SectionInstance The instance number of Firmware Section to read from starting from 0.
@param Buffer On output, Buffer contains the the data read from the section in the Firmware File found.
@param Size On output, the size of Buffer.
@retval EFI_SUCCESS The image is found and data and size is returned.
@retval EFI_NOT_FOUND The image specified by NameGuid and SectionType can't be found.
@retval EFI_OUT_OF_RESOURCES There were not enough resources to allocate the output data buffer or complete the operations.
@retval EFI_DEVICE_ERROR A hardware error occurs during reading from the Firmware Volume.
@retval EFI_ACCESS_DENIED The firmware volume containing the searched Firmware File is configured to disallow reads.
**/
EFI_STATUS
InternalGetSectionFromFv (
IN EFI_HANDLE FvHandle,
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;
UINT32 AuthenticationStatus;
ASSERT (NameGuid != NULL);
ASSERT (Buffer != NULL);
ASSERT (Size != NULL);
ASSERT (FvHandle != NULL);
Status = gBS->HandleProtocol (
FvHandle,
&gEfiFirmwareVolume2ProtocolGuid,
(VOID **) &Fv
);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Read desired section content in NameGuid file
//
*Buffer = NULL;
*Size = 0;
Status = Fv->ReadSection (
Fv,
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size,
&AuthenticationStatus
);
if (EFI_ERROR (Status) && (SectionType == EFI_SECTION_TE)) {
//
// Try reading PE32 section, if the required section is TE type
//
*Buffer = NULL;
*Size = 0;
Status = Fv->ReadSection (
Fv,
NameGuid,
EFI_SECTION_PE32,
SectionInstance,
Buffer,
Size,
&AuthenticationStatus
);
}
return Status;
}
/**
Searches all the availables firmware volumes and returns the first matching FFS section.
This function searches all the firmware volumes for FFS files with an FFS filename specified by NameGuid.
The order that the firmware volumes is searched is not deterministic. For each FFS file found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance instances
of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections
are retrieved from an FFS file based on SectionType and SectionInstance.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If NameGuid is NULL, then ASSERT().
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param NameGuid A pointer to to the FFS filename GUID to search for within
any of the firmware volumes in the platform.
@param SectionType Indicates the FFS section type to search for within the FFS file specified by NameGuid.
@param SectionInstance Indicates which section instance within the FFS file specified by NameGuid to retrieve.
@param Buffer On output, a pointer to a callee allocated buffer containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromAnyFv (
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
UINTN Index;
EFI_HANDLE FvHandle;
//
// Search the FV that contain the caller's FFS first.
// FV builder can choose to build FFS into the this FV
// so that this implementation of GetSectionFromAnyFv
// will locate the FFS faster.
//
FvHandle = InternalImageHandleToFvHandle (gImageHandle);
Status = InternalGetSectionFromFv (
FvHandle,
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
return EFI_SUCCESS;
}
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolume2ProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
goto Done;
}
for (Index = 0; Index < HandleCount; Index++) {
//
// Skip the FV that contain the caller's FFS
//
if (HandleBuffer[Index] != FvHandle) {
Status = InternalGetSectionFromFv (
HandleBuffer[Index],
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
goto Done;
}
}
}
if (Index == HandleCount) {
Status = EFI_NOT_FOUND;
}
Done:
if (HandleBuffer != NULL) {
FreePool(HandleBuffer);
}
return Status;
}
/**
Searches the firmware volume that the currently executing module was loaded from and returns the first matching FFS section.
This function searches the firmware volume that the currently executing module was loaded
from for an FFS file with an FFS filename specified by NameGuid. If the FFS file is found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance
instances of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections are retrieved from
an FFS file based on SectionType and SectionInstance.
If the currently executing module was not loaded from a firmware volume, then EFI_NOT_FOUND is returned.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If NameGuid is NULL, then ASSERT().
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param NameGuid A pointer to to the FFS filename GUID to search for within
the firmware volumes that the currently executing module was loaded from.
@param SectionType Indicates the FFS section type to search for within the FFS file specified by NameGuid.
@param SectionInstance Indicates which section instance within the FFS file specified by NameGuid to retrieve.
@param Buffer On output, a pointer to a callee allocated buffer containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromFv (
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
return InternalGetSectionFromFv (
InternalImageHandleToFvHandle(gImageHandle),
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
}
/**
Searches the FFS file the the currently executing module was loaded from and returns the first matching FFS section.
This function searches the FFS file that the currently executing module was loaded from for a FFS sections of type SectionType.
If the FFS file contains at least SectionInstance instances of the FFS section specified by SectionType,
then the SectionInstance instance is returned in Buffer. Buffer is allocated using AllocatePool(),
and the size of the allocated buffer is returned in Size. It is the caller's responsibility
to use FreePool() to free the allocated buffer. See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for
details on how sections are retrieved from an FFS file based on SectionType and SectionInstance.
If the currently executing module was not loaded from an FFS file, then EFI_NOT_FOUND is returned.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param SectionType Indicates the FFS section type to search for within the FFS file
that the currently executing module was loaded from.
@param SectionInstance Indicates which section instance to retrieve within the FFS file
that the currently executing module was loaded from.
@param Buffer On output, a pointer to a callee allocated buffer containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromFfs (
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
return InternalGetSectionFromFv(
InternalImageHandleToFvHandle(gImageHandle),
&gEfiCallerIdGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
}