diff options
Diffstat (limited to 'gnu-efi/gnu-efi-3.0/apps/drv0.c')
| -rw-r--r-- | gnu-efi/gnu-efi-3.0/apps/drv0.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/gnu-efi/gnu-efi-3.0/apps/drv0.c b/gnu-efi/gnu-efi-3.0/apps/drv0.c new file mode 100644 index 0000000..126e8e7 --- /dev/null +++ b/gnu-efi/gnu-efi-3.0/apps/drv0.c @@ -0,0 +1,193 @@ +/* + * 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() */ +} |