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/** @file
The entry of the embedded BDS. This BDS does not follow the Boot Manager requirements
of the UEFI specification as it is designed to implement an embedded systmes
propriatary boot scheme.
This template assume a DXE driver produces a SerialIo protocol not using the EFI
driver module and it will attempt to connect a console on top of this.
Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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 "BdsEntry.h"
BOOLEAN gConsolePresent = FALSE;
EFI_HANDLE mBdsImageHandle = NULL;
EFI_BDS_ARCH_PROTOCOL gBdsProtocol = {
BdsEntry,
};
/**
This function uses policy data from the platform to determine what operating
system or system utility should be loaded and invoked. This function call
also optionally make the use of user input to determine the operating system
or system utility to be loaded and invoked. When the DXE Core has dispatched
all the drivers on the dispatch queue, this function is called. This
function will attempt to connect the boot devices required to load and invoke
the selected operating system or system utility. During this process,
additional firmware volumes may be discovered that may contain addition DXE
drivers that can be dispatched by the DXE Core. If a boot device cannot be
fully connected, this function calls the DXE Service Dispatch() to allow the
DXE drivers from any newly discovered firmware volumes to be dispatched.
Then the boot device connection can be attempted again. If the same boot
device connection operation fails twice in a row, then that boot device has
failed, and should be skipped. This function should never return.
@param This The EFI_BDS_ARCH_PROTOCOL instance.
@return None.
**/
VOID
EFIAPI
BdsEntry (
IN EFI_BDS_ARCH_PROTOCOL *This
)
{
EFI_STATUS Status;
UINTN NoHandles;
EFI_HANDLE *Buffer;
UINTN Index;
EFI_HANDLE FvHandle;
EFI_GUID *NameGuid;
//
// This code assumes that a DXE driver produces a SerialIo protocol not following the EFI
// driver model. At a minimum we need to connect an EFI driver model terminal driver on top
// of the serial driver.
//
Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiSerialIoProtocolGuid, NULL, &NoHandles, &Buffer);
if (!EFI_ERROR (Status)) {
for (Index = 0; Index < NoHandles; Index++) {
// For every Serial IO protocol in the system connect EFI drivers to it.
// This should cause the terminal driver to bind to the Serial IO protocol and produce a
// child handle that produces SimpleTextOut & SImpleTextIn protocols
gBS->ConnectController (Buffer[Index], NULL, NULL, TRUE);
}
FreePool (Buffer);
}
//
// Now we need to setup the EFI System Table with information about the console devices.
// This code is normally in the console spliter driver on platforms that support multiple
// consoles at the same time
//
Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiSimpleTextOutProtocolGuid, NULL, &NoHandles, &Buffer);
if (!EFI_ERROR (Status)) {
// Use the first SimpleTextOut we find and update the EFI System Table
gST->ConsoleOutHandle = Buffer[0];
gST->StandardErrorHandle = Buffer[0];
Status = gBS->HandleProtocol (Buffer[0], &gEfiSimpleTextOutProtocolGuid, (VOID **)&gST->ConOut);
ASSERT_EFI_ERROR (Status);
gST->StdErr = gST->ConOut;
FreePool (Buffer);
gConsolePresent = TRUE;
}
Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiSimpleTextInProtocolGuid, NULL, &NoHandles, &Buffer);
if (!EFI_ERROR (Status)) {
// Use the first SimpleTextIn we find and update the EFI System Table
gST->ConsoleInHandle = Buffer[0];
Status = gBS->HandleProtocol (Buffer[0], &gEfiSimpleTextInProtocolGuid, (VOID **)&gST->ConIn);
ASSERT_EFI_ERROR (Status);
FreePool (Buffer);
}
//
// We now have EFI Consoles up and running. Print () will work now. DEBUG () and ASSERT () worked
// prior to this point as they were configured to use a more primative output scheme.
//
//
// Platform specific stuff goes here
//
//
// Normal UEFI behavior is to process Globally Defined Variables as defined in Chapter 3
// (Boot Manager) of the UEFI specification. For this embedded system we don't do this.
//
//
// Search all the FVs for an application with a UI Section of Ebl. A .FDF file can be used
// to control the names of UI sections in an FV.
//
Status = FindApplicationMatchingUiSection (L"Ebl", &FvHandle, &NameGuid);
if (EFI_ERROR (Status)) {
//
// Just load the first application we find reguardless of name.
// This is the fallback path.
//
Status = FindApplicationMatchingUiSection (NULL, &FvHandle, &NameGuid);
// Nothing to boot
ASSERT_EFI_ERROR (Status);
}
Status = LoadPeCoffSectionFromFv (FvHandle, NameGuid);
//
// EFI does not define the bavior if all boot attemps fail and the last one returns.
// So we make a policy choice to reset the system since this BDS does not have a UI.
//
gRT->ResetSystem (EfiResetCold, Status, 0, NULL);
return ;
}
EFI_STATUS
EFIAPI
BdsInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
mBdsImageHandle = ImageHandle;
//
// Install protocol interface
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mBdsImageHandle,
&gEfiBdsArchProtocolGuid, &gBdsProtocol,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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