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/** @file
* PE/COFF emulator protocol implementation to start Linux kernel
* images from non-native firmware
*
* Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
*/
#include <PiDxe.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PeCoffLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/PeCoffImageEmulator.h>
#pragma pack (1)
typedef struct {
UINT8 Type;
UINT8 Size;
UINT16 MachineType;
UINT32 EntryPoint;
} PE_COMPAT_TYPE1;
#pragma pack ()
STATIC
BOOLEAN
EFIAPI
IsImageSupported (
IN EDKII_PECOFF_IMAGE_EMULATOR_PROTOCOL *This,
IN UINT16 ImageType,
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath OPTIONAL
)
{
return ImageType == EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION;
}
STATIC
EFI_IMAGE_ENTRY_POINT
EFIAPI
GetCompatEntryPoint (
IN EFI_PHYSICAL_ADDRESS ImageBase
)
{
EFI_IMAGE_DOS_HEADER *DosHdr;
UINTN PeCoffHeaderOffset;
EFI_IMAGE_NT_HEADERS32 *Pe32;
EFI_IMAGE_SECTION_HEADER *Section;
UINTN NumberOfSections;
PE_COMPAT_TYPE1 *PeCompat;
UINTN PeCompatEnd;
DosHdr = (EFI_IMAGE_DOS_HEADER *)(UINTN)ImageBase;
if (DosHdr->e_magic != EFI_IMAGE_DOS_SIGNATURE) {
return NULL;
}
PeCoffHeaderOffset = DosHdr->e_lfanew;
Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN)ImageBase + PeCoffHeaderOffset);
Section = (EFI_IMAGE_SECTION_HEADER *)((UINTN)&Pe32->OptionalHeader +
Pe32->FileHeader.SizeOfOptionalHeader);
NumberOfSections = (UINTN)Pe32->FileHeader.NumberOfSections;
while (NumberOfSections--) {
if (!CompareMem (Section->Name, ".compat", sizeof (Section->Name))) {
//
// Dereference the section contents to find the mixed mode entry point
//
PeCompat = (PE_COMPAT_TYPE1 *)((UINTN)ImageBase + Section->VirtualAddress);
PeCompatEnd = (UINTN)(VOID *)PeCompat + Section->Misc.VirtualSize;
while (PeCompat->Type != 0 && (UINTN)(VOID *)PeCompat < PeCompatEnd) {
if (PeCompat->Type == 1 &&
PeCompat->Size >= sizeof (PE_COMPAT_TYPE1) &&
EFI_IMAGE_MACHINE_TYPE_SUPPORTED (PeCompat->MachineType)) {
return (EFI_IMAGE_ENTRY_POINT)((UINTN)ImageBase + PeCompat->EntryPoint);
}
PeCompat = (PE_COMPAT_TYPE1 *)((UINTN)PeCompat + PeCompat->Size);
ASSERT ((UINTN)(VOID *)PeCompat < PeCompatEnd);
}
}
Section++;
}
return NULL;
}
STATIC
EFI_STATUS
EFIAPI
RegisterImage (
IN EDKII_PECOFF_IMAGE_EMULATOR_PROTOCOL *This,
IN EFI_PHYSICAL_ADDRESS ImageBase,
IN UINT64 ImageSize,
IN OUT EFI_IMAGE_ENTRY_POINT *EntryPoint
)
{
EFI_IMAGE_ENTRY_POINT CompatEntryPoint;
CompatEntryPoint = GetCompatEntryPoint (ImageBase);
if (CompatEntryPoint == NULL) {
return EFI_UNSUPPORTED;
}
*EntryPoint = CompatEntryPoint;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
EFIAPI
UnregisterImage (
IN EDKII_PECOFF_IMAGE_EMULATOR_PROTOCOL *This,
IN EFI_PHYSICAL_ADDRESS ImageBase
)
{
return EFI_SUCCESS;
}
STATIC EDKII_PECOFF_IMAGE_EMULATOR_PROTOCOL mCompatLoaderPeCoffEmuProtocol = {
IsImageSupported,
RegisterImage,
UnregisterImage,
EDKII_PECOFF_IMAGE_EMULATOR_VERSION,
EFI_IMAGE_MACHINE_X64
};
EFI_STATUS
EFIAPI
CompatImageLoaderDxeEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return gBS->InstallProtocolInterface (&ImageHandle,
&gEdkiiPeCoffImageEmulatorProtocolGuid,
EFI_NATIVE_INTERFACE,
&mCompatLoaderPeCoffEmuProtocol);
}
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