uefildr.c File Reference

#include <uefildr.h>
#include <debug.h>

Include dependency graph for uefildr.c:

Go to the source code of this file.

Functions
	DBG_DEFAULT_CHANNEL (WARNING)
void	_changestack (VOID)
EFI_STATUS	EfiEntry (_In_ EFI_HANDLE ImageHandle, _In_ EFI_SYSTEM_TABLE *SystemTable)
DECLSPEC_NORETURN void	ExecuteLoaderCleanly (PVOID PreviousStack)
DECLSPEC_NORETURN VOID __cdecl	Reboot (VOID)

Variables
EFI_HANDLE	GlobalImageHandle
EFI_SYSTEM_TABLE *	GlobalSystemTable
PVOID	UefiServiceStack
PVOID	BasicStack

Function Documentation

_changestack()

void _changestack

(

VOID

)

Referenced by EfiEntry().

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

WARNING

)

EfiEntry()

EFI_STATUS EfiEntry	(	_In_ EFI_HANDLE	ImageHandle,
		_In_ EFI_SYSTEM_TABLE *	SystemTable
	)

Definition at line 25 of file uefildr.c.

{
    PCSTR CmdLine = ""; // FIXME: Determine a command-line from UEFI boot options
 
    SystemTable->ConOut->OutputString(SystemTable->ConOut, L"UEFI EntryPoint: Starting freeldr from UEFI");
    GlobalImageHandle = ImageHandle;
    GlobalSystemTable = SystemTable;
 
    /* Load the default settings from the command-line */
    LoadSettings(CmdLine);
 
    /* Debugger pre-initialization */
    DebugInit(BootMgrInfo.DebugString);
 
    MachInit(CmdLine);
 
    /* UI pre-initialization */
    if (!UiInitialize(FALSE))
    {
        UiMessageBoxCritical("Unable to initialize UI.");
        goto Quit;
    }
 
    /* Initialize memory manager */
    if (!MmInitializeMemoryManager())
    {
        UiMessageBoxCritical("Unable to initialize memory manager.");
        goto Quit;
    }
 
    /* Initialize I/O subsystem */
    FsInit();
 
    /* Initialize the module list */
    if (!PeLdrInitializeModuleList())
    {
        UiMessageBoxCritical("Unable to initialize module list.");
        goto Quit;
    }
 
    if (!MachInitializeBootDevices())
    {
        UiMessageBoxCritical("Error when detecting hardware.");
        goto Quit;
    }
 
    /* 0x32000 is what UEFI defines, but we can go smaller if we want */
    SIZE_T StackSize = 0x32000;
    PVOID AllocatedStackMem = MmAllocateMemoryWithType(StackSize, LoaderOsloaderStack);
 
    if (!AllocatedStackMem)
    {
        UiMessageBoxCritical("Unable to allocate OS loader stack.");
        goto Quit;
    }
 
    /* Stacks grow downward so set the initial stack pointer to the top of the allocated region */
    BasicStack = (PVOID)((ULONG_PTR)AllocatedStackMem + StackSize);
    _changestack();
 
Quit:
    /* If we reach this point, something went wrong before, therefore reboot */
    Reboot();
 
    UNREACHABLE;
    return 0;
}

ExecuteLoaderCleanly()

DECLSPEC_NORETURN void ExecuteLoaderCleanly

(

PVOID

PreviousStack

)

Definition at line 97 of file uefildr.c.

{
    TRACE("ExecuteLoaderCleanly Entry\n");
    UefiServiceStack = PreviousStack;
 
    RunLoader();
    Reboot();
    UNREACHABLE;
}

Reboot()

DECLSPEC_NORETURN VOID __cdecl Reboot

(

VOID

)

Definition at line 108 of file uefildr.c.

{
    WARN("Performing cold reset\n");
 
    if (GlobalSystemTable && GlobalSystemTable->RuntimeServices)
    {
        /* Attempt a native firmware cold reset */
        GlobalSystemTable->RuntimeServices->ResetSystem(
            EfiResetCold,
            EFI_SUCCESS,
            0,
            NULL
        );
    }
 
    /* Fallback dead-loop if runtime services are missing or fail to respond */
    for (;;)
    {
#if defined(_M_IX86) || defined(_M_AMD64)
        __halt();
#else
        /* Fallback placeholder loop for other platforms */
        NOTHING;
#endif
    }
}

Referenced by BootMain(), DoRebootCommand(), EfiEntry(), ExecuteLoaderCleanly(), KeBugCheckWithTf(), OptionMenuReboot(), and RunLoader().

Variable Documentation

BasicStack

PVOID BasicStack

Definition at line 18 of file uefildr.c.

Referenced by EfiEntry().

GlobalImageHandle

EFI_HANDLE GlobalImageHandle

Definition at line 15 of file uefildr.c.

Referenced by EfiEntry(), UefiExitBootServices(), and UefiMemGetMemoryMap().

GlobalSystemTable

EFI_SYSTEM_TABLE* GlobalSystemTable

Definition at line 16 of file uefildr.c.

Referenced by EfiEntry(), FindAcpiBios(), PUEFI_LoadMemoryMap(), Reboot(), StallExecutionProcessor(), UefiConsGetCh(), UefiConsKbHit(), UefiDiskGetCacheableBlockCount(), UefiDiskGetDriveGeometry(), UefiDiskOpen(), UefiDiskRead(), UefiDiskReadLogicalSectors(), UefiEnsureDiskReadBufferAligned(), UefiExitBootServices(), UefiGetBootPartitionEntry(), UefiGetTime(), UefiHwIdle(), UefiInitializeAppleGraphics(), UefiInitializeBootDevices(), UefiInitializeGop(), UefiMemGetMemoryMap(), UefiSetBootpath(), and UefiSetupBlockDevices().

UefiServiceStack

PVOID UefiServiceStack

Definition at line 17 of file uefildr.c.

Referenced by ExecuteLoaderCleanly().