75e4db2d3b
There are two variants of the Linux Loader EFI application: - the ATAG version 'LinuxAtagLoader.inf': expect to start an ATAG 'zImage' in the same directory as the EFI application - the FDT version 'LinuxFdtLoader.inf': load the FDT blob 'platform.dtb' and the FDT 'zImage' from the same directory as the EFI application. When these applications are started without any argument, a menu appears to the user to create/update a boot entry. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12410 6f19259b-4bc3-4df7-8a09-765794883524
106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/** @file
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*
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* Copyright (c) 2011, ARM Limited. All rights reserved.
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*
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**/
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#include "LinuxInternal.h"
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#include <Library/PrintLib.h>
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#include <Library/UefiApplicationEntryPoint.h>
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/**
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The user Entry Point for Application. The user code starts with this function
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as the real entry point for the application.
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The entry point is executed successfully.
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@retval other Some error occurs when executing this entry point.
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**/
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EFI_STATUS
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EFIAPI
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UefiMain (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
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LINUX_LOADER_OPTIONAL_DATA* LinuxOptionalData;
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EFI_DEVICE_PATH* DevicePathKernel;
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EFI_DEVICE_PATH* DevicePathFdt;
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EFI_DEVICE_PATH* InitrdDevicePath;
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CHAR16* OptionalDataInitrd;
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CHAR8* OptionalDataArguments;
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CHAR16* Initrd;
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Status = gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **)&LoadedImage);
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ASSERT_EFI_ERROR (Status);
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if (LoadedImage->LoadOptionsSize == 0) {
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Status = LinuxLoaderConfig (LoadedImage);
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} else {
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// Ensure the signature is correct
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LinuxOptionalData = (LINUX_LOADER_OPTIONAL_DATA*)LoadedImage->LoadOptions;
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if (LinuxOptionalData->Signature != LINUX_LOADER_SIGNATURE) {
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return EFI_UNSUPPORTED;
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}
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// Generate the File Path Node for the Linux Kernel & Device Tree blobl
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DevicePathKernel = FileDevicePath (LoadedImage->DeviceHandle, LINUX_KERNEL_NAME);
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DevicePathFdt = FileDevicePath (LoadedImage->DeviceHandle, FDT_NAME);
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if (LinuxOptionalData->CmdLineLength > 0) {
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OptionalDataArguments = (CHAR8*)LinuxOptionalData + sizeof(LINUX_LOADER_OPTIONAL_DATA);
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} else {
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OptionalDataArguments = NULL;
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}
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if (LinuxOptionalData->InitrdPathListLength > 0) {
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if (OptionalDataArguments != NULL) {
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OptionalDataInitrd = (CHAR16*)(OptionalDataArguments + LinuxOptionalData->CmdLineLength);
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} else {
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OptionalDataInitrd = (CHAR16*)LinuxOptionalData + sizeof(LINUX_LOADER_OPTIONAL_DATA);
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}
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// If pointer not aligned
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if ((UINTN)OptionalDataInitrd & 0x1) {
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Initrd = (CHAR16*)AllocateCopyPool (LinuxOptionalData->InitrdPathListLength, OptionalDataInitrd);
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} else {
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Initrd = OptionalDataInitrd;
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}
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InitrdDevicePath = FileDevicePath (LoadedImage->DeviceHandle, Initrd);
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} else {
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OptionalDataInitrd = NULL;
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InitrdDevicePath = NULL;
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Initrd = NULL;
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}
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// Load and Start the Linux Kernel (we should never return)
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Status = BdsBootLinuxFdt (DevicePathKernel, InitrdDevicePath, OptionalDataArguments, DevicePathFdt);
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if ((UINTN)OptionalDataInitrd & 0x1) {
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FreePool (Initrd);
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}
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FreePool (DevicePathKernel);
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if (InitrdDevicePath) {
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FreePool (InitrdDevicePath);
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}
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}
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return Status;
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}
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