80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
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/*
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* Copyright (C) 2013 David Decotigny <decot@googlers.com>
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*
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* See drv0.c for an example session.
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*/
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#include <efi.h>
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#include <efilib.h>
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#include "drv0.h"
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static EFI_GUID GnuEfiAppsDrv0ProtocolGuid
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= GNU_EFI_APPS_DRV0_PROTOCOL_GUID;
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static
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EFI_STATUS
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PlayWithGnuEfiAppsDrv0Protocol(IN EFI_HANDLE DrvHandle) {
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EFI_STATUS Status;
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GNU_EFI_APPS_DRV0_PROTOCOL *drv = NULL;
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UINTN NumberOfHello = 0;
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Status = uefi_call_wrapper(BS->OpenProtocol, 6,
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DrvHandle,
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&GnuEfiAppsDrv0ProtocolGuid,
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&drv,
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DrvHandle,
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NULL,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (EFI_ERROR(Status)) {
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Print(L"Cannot open proto: %d\n", Status);
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return Status;
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}
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Status = uefi_call_wrapper(drv->SayHello, 2, drv, L"Sample UEFI Driver");
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if (EFI_ERROR(Status)) {
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Print(L"Cannot call SayHello: %d\n", Status);
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}
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Status = uefi_call_wrapper(drv->GetNumberOfHello, 2, drv, &NumberOfHello);
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if (EFI_ERROR(Status)) {
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Print(L"Cannot call GetNumberOfHello: %d\n", Status);
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} else {
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Print(L"Hello was called %d time(s).\n", NumberOfHello);
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS
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efi_main (EFI_HANDLE Image, EFI_SYSTEM_TABLE *SysTab)
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{
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EFI_STATUS Status;
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EFI_HANDLE *Handles = NULL;
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UINTN i, NoHandles = 0;
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InitializeLib(Image, SysTab);
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Status = LibLocateHandle(ByProtocol, &GnuEfiAppsDrv0ProtocolGuid,
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NULL, &NoHandles, &Handles);
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if (EFI_ERROR(Status)) {
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Print(L"Error looking up handles for proto: %d\n", Status);
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return Status;
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}
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for (i = 0 ; i < NoHandles ; ++i)
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{
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Print(L"Playing with driver instance %d...\n", i);
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Status = PlayWithGnuEfiAppsDrv0Protocol(Handles[i]);
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if (EFI_ERROR(Status))
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Print(L"Error playing with instance %d, skipping\n", i);
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}
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if (Handles)
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FreePool(Handles);
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return EFI_SUCCESS;
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}
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