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/*
* Copyright (C) 2013 David Decotigny <decot@googlers.com>
*
* Sample EFI shell session, together with drv0_use.efi:
*
* # Loading first instance:
*
* fs0:\> load drv0.efi
* Driver instance loaded successfully.
* load: Image fs0:\drv0.efi loaded at 2FD7C000 - Success
*
* # Testing 1st instance:
*
* fs0:\> drv0_use.efi
* Playing with driver instance 0...
* Hello Sample UEFI Driver!
* Hello was called 1 time(s).
*
* fs0:\> drv0_use.efi
* Playing with driver instance 0...
* Hello Sample UEFI Driver!
* Hello was called 2 time(s).
*
* # Loading another instance:
*
* fs0:\> load drv0.efi
* Driver instance loaded successfully.
* load: Image fs0:\drv0.efi loaded at 2FD6D000 - Success
*
* # Using both instances:
*
* fs0:\> drv0_use.efi
* Playing with driver instance 0...
* Hello Sample UEFI Driver!
* Hello was called 3 time(s).
* Playing with driver instance 1...
* Hello Sample UEFI Driver!
* Hello was called 1 time(s).
*
* fs0:\> drv0_use.efi
* Playing with driver instance 0...
* Hello Sample UEFI Driver!
* Hello was called 4 time(s).
* Playing with driver instance 1...
* Hello Sample UEFI Driver!
* Hello was called 2 time(s).
*
* # Removing 1st instance:
*
* fs0:\> dh
* Handle dump
* 1: Image(DxeCore)
* [...]
* 79: Image(\/drv0.efi) ImageDevPath (..A,0x800,0x17F7DF)/\/drv0.efi)
* 7A: Image(\/drv0.efi) ImageDevPath (..A,0x800,0x17F7DF)/\/drv0.efi)
*
* fs0:\> unload 79
* 79: Image(\/drv0.efi) ImageDevPath (..A,0x800,0x17F7DF)/\/drv0.efi)
* Unload driver image (y/n)? y
* Driver instance unloaded.
* unload: Success
*
* # Only 2nd instance remaining:
*
* fs0:\> drv0_use.efi
* Playing with driver instance 0...
* Hello Sample UEFI Driver!
* Hello was called 3 time(s).
*
* # Removing 2nd/last instance:
*
* fs0:\> dh
* Handle dump
* 1: Image(DxeCore)
* [...]
* 79: Image(\/drv0.efi) ImageDevPath (..A,0x800,0x17F7DF)/\/drv0.efi)
*
* fs0:\> unload 79
* 79: Image(\/drv0.efi) ImageDevPath (..A,0x800,0x17F7DF)/\/drv0.efi)
* Unload driver image (y/n)? y
* Driver instance unloaded.
* unload: Success
*
* # Expect error: no other drv0 instance left
*
* fs0:\> drv0_use.efi
* Error looking up handles for proto: 14
*/
#include <efi.h>
#include <efilib.h>
#include "drv0.h"
static const EFI_GUID GnuEfiAppsDrv0ProtocolGuid
= GNU_EFI_APPS_DRV0_PROTOCOL_GUID;
static struct {
GNU_EFI_APPS_DRV0_PROTOCOL Proto;
UINTN Counter;
} InternalGnuEfiAppsDrv0ProtocolData;
static
EFI_STATUS
EFI_FUNCTION
Drv0SayHello(
IN struct _GNU_EFI_APPS_DRV0_PROTOCOL *This,
IN const CHAR16 *HelloWho
)
{
if (! HelloWho)
return EFI_INVALID_PARAMETER;
Print(L"Hello %s!\n", HelloWho);
InternalGnuEfiAppsDrv0ProtocolData.Counter ++;
return EFI_SUCCESS;
}
static
EFI_STATUS
EFI_FUNCTION
Drv0GetNumberOfHello(
IN struct _GNU_EFI_APPS_DRV0_PROTOCOL *This,
OUT UINTN *NumberOfHello
)
{
if (! NumberOfHello)
return EFI_INVALID_PARAMETER;
*NumberOfHello = InternalGnuEfiAppsDrv0ProtocolData.Counter;
return EFI_SUCCESS;
}
static
EFI_STATUS
EFI_FUNCTION
Drv0Unload(IN EFI_HANDLE ImageHandle)
{
LibUninstallProtocolInterfaces(ImageHandle,
&GnuEfiAppsDrv0ProtocolGuid,
&InternalGnuEfiAppsDrv0ProtocolData.Proto,
NULL);
Print(L"Driver instance unloaded.\n", ImageHandle);
return EFI_SUCCESS;
}
EFI_STATUS
efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SysTab)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE *LoadedImage = NULL;
InitializeLib(ImageHandle, SysTab);
/* Initialize global protocol definition + data */
InternalGnuEfiAppsDrv0ProtocolData.Proto.SayHello
= (GNU_EFI_APPS_DRV0_SAY_HELLO) Drv0SayHello;
InternalGnuEfiAppsDrv0ProtocolData.Proto.GetNumberOfHello
= (GNU_EFI_APPS_DRV0_GET_NUMBER_OF_HELLO) Drv0GetNumberOfHello;
InternalGnuEfiAppsDrv0ProtocolData.Counter = 0;
/* Grab handle to this image: we'll attach our proto instance to it */
Status = uefi_call_wrapper(BS->OpenProtocol, 6,
ImageHandle, &LoadedImageProtocol,
&LoadedImage, ImageHandle,
NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (EFI_ERROR(Status)) {
Print(L"Could not open loaded image protocol: %d\n", Status);
return Status;
}
/* Attach our proto to the current driver image */
Status = LibInstallProtocolInterfaces(
&ImageHandle, &GnuEfiAppsDrv0ProtocolGuid,
&InternalGnuEfiAppsDrv0ProtocolData.Proto, NULL);
if (EFI_ERROR(Status)) {
Print(L"Error registering driver instance: %d\n", Status);
return Status;
}
/* Register Unload callback, used to unregister current protocol
* instance from system */
LoadedImage->Unload = (EFI_IMAGE_UNLOAD)Drv0Unload;
Print(L"Driver instance loaded successfully.\n");
return EFI_SUCCESS; /* at this point, this instance stays resident
* until image is unloaded, eg. with shell's unload,
* ExitBootServices() */
}
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