source: mainline/boot/arch/ia64/loader/gefi/apps/t.c@ abe6163

#define EFI_SUCCESS             0

typedef short                   CHAR16;
typedef unsigned long           UINTN;
typedef unsigned long long      UINT64;
typedef unsigned int            UINT32;
typedef void *                  EFI_HANDLE;
typedef UINTN                   EFI_STATUS;

typedef struct _EFI_TABLE_HEARDER {
    UINT64                      Signature;
    UINT32                      Revision;
    UINT32                      HeaderSize;
    UINT32                      CRC32;
    UINT32                      Reserved;
} EFI_TABLE_HEADER;

typedef EFI_STATUS (*EFI_TEXT_STRING) (void *This, CHAR16 *String);

typedef struct _SIMPLE_TEXT_OUTPUT_INTERFACE {
    void *                  Reset;

    EFI_TEXT_STRING                 OutputString;
} SIMPLE_TEXT_OUTPUT_INTERFACE;

typedef struct _EFI_SYSTEM_TABLE {
    EFI_TABLE_HEADER                Hdr;

    CHAR16                          *FirmwareVendor;
    UINT32                          FirmwareRevision;

    EFI_HANDLE                      ConsoleInHandle;
 /*SIMPLE_INPUT_INTERFACE*/ void    *ConIn;

    EFI_HANDLE                      ConsoleOutHandle;
    SIMPLE_TEXT_OUTPUT_INTERFACE    *ConOut;

    EFI_HANDLE                      StandardErrorHandle;
    SIMPLE_TEXT_OUTPUT_INTERFACE    *StdErr;

 /*EFI_RUNTIME_SERVICES*/ void            *RuntimeServices;
 /*EFI_BOOT_SERVICES*/ void               *BootServices;

    UINTN                           NumberOfTableEntries;
 /*EFI_CONFIGURATION_TABLE*/void         *ConfigurationTable;

} EFI_SYSTEM_TABLE;

static CHAR16 *
a2u (char *str)
{
        static CHAR16 mem[2048];
        int i;

        for (i = 0; str[i]; ++i)
                mem[i] = (CHAR16) str[i];
        mem[i] = 0;
        return mem;
}

EFI_STATUS
efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab)
{
        SIMPLE_TEXT_OUTPUT_INTERFACE *conout;

        conout = systab->ConOut;
        conout->OutputString(conout, (CHAR16 *)L"Hello World!\n\r");
        conout->OutputString(conout, a2u("Hello World!\n\r"));

        return EFI_SUCCESS;
}