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-UEFI Programming with FASM
-
-As an extra, I will also demonstrate same Hello World example in assembly (using FASM, that currently has experimental UEFI support since version 1.67.28):
-
-First we need some to create simple UEFI headers (efi.inc):
-
-;for 32/64 portability and automatic natural align in structure definitions
-
-struc int8 {
-  . db ?
-}
-struc int16 {
-  align 2
-  . dw ?
-}
-struc int32 {
-  align 4
-  . dd ?
-}
-struc int64 {
-  align 8
-  . dq ?
-}
-struc intn {
-  align 8
-  . dq ?
-}
-struc dptr {
-  align 8
-  . dq ?
-}
-
-;symbols
-
-EFIERR = 0x8000000000000000
-EFI_SUCCESS			= 0
-EFI_LOAD_ERROR			= EFIERR or 1
-EFI_INVALID_PARAMETER		= EFIERR or 2
-EFI_UNSUPPORTED 		= EFIERR or 3
-EFI_BAD_BUFFER_SIZE		= EFIERR or 4
-EFI_BUFFER_TOO_SMALL		= EFIERR or 5
-EFI_NOT_READY			= EFIERR or 6
-EFI_DEVICE_ERROR		= EFIERR or 7
-EFI_WRITE_PROTECTED		= EFIERR or 8
-EFI_OUT_OF_RESOURCES		= EFIERR or 9
-EFI_VOLUME_CORRUPTED		= EFIERR or 10
-EFI_VOLUME_FULL 		= EFIERR or 11
-EFI_NO_MEDIA			= EFIERR or 12
-EFI_MEDIA_CHANGED		= EFIERR or 13
-EFI_NOT_FOUND			= EFIERR or 14
-EFI_ACCESS_DENIED		= EFIERR or 15
-EFI_NO_RESPONSE 		= EFIERR or 16
-EFI_NO_MAPPING			= EFIERR or 17
-EFI_TIMEOUT			= EFIERR or 18
-EFI_NOT_STARTED 		= EFIERR or 19
-EFI_ALREADY_STARTED		= EFIERR or 20
-EFI_ABORTED			= EFIERR or 21
-EFI_ICMP_ERROR			= EFIERR or 22
-EFI_TFTP_ERROR			= EFIERR or 23
-EFI_PROTOCOL_ERROR		= EFIERR or 24
-
-;helper macro for definition of relative structure member offsets
-
-macro struct name
-{
-  virtual at 0
-    name name
-  end virtual
-}
-
-;structures
-
-struc EFI_TABLE_HEADER {
- .Signature    int64
- .Revision     int32
- .HeaderSize   int32
- .CRC32        int32
- .Reserved     int32
-}
-struct EFI_TABLE_HEADER
-
-struc EFI_SYSTEM_TABLE {
- .Hdr		       EFI_TABLE_HEADER
- .FirmwareVendor       dptr
- .FirmwareRevision     int32
- .ConsoleInHandle      dptr
- .ConIn 	       dptr
- .ConsoleOutHandle     dptr
- .ConOut	       dptr
- .StandardErrorHandle  dptr
- .StdErr	       dptr
- .RuntimeServices      dptr
- .BootServices	       dptr
- .NumberOfTableEntries intn
- .ConfigurationTable   dptr
-}
-struct EFI_SYSTEM_TABLE
-
-struc SIMPLE_TEXT_OUTPUT_INTERFACE {
- .Reset 	    dptr
- .OutputString	    dptr
- .TestString	    dptr
- .QueryMode	    dptr
- .SetMode	    dptr
- .SetAttribute	    dptr
- .ClearScreen	    dptr
- .SetCursorPosition dptr
- .EnableCursor	    dptr
- .Mode		    dptr
-}
-struct SIMPLE_TEXT_OUTPUT_INTERFACE
-
-And here is the assembly code itself (hello.asm):
-
-format pe64 dll efi
-entry main
-
-section '.text' code executable readable
-
-include 'efi.inc'
-
-main:
- sub rsp, 4*8              ; reserve space for 4 arguments
-
- mov [Handle], rcx         ; ImageHandle
- mov [SystemTable], rdx    ; pointer to SystemTable
-
- lea rdx, [_hello]
- mov rcx, [SystemTable]
- mov rcx, [rcx + EFI_SYSTEM_TABLE.ConOut]
- call [rcx + SIMPLE_TEXT_OUTPUT_INTERFACE.OutputString]
-
- add rsp, 4*8
- mov eax, EFI_SUCCESS
- retn
-
-
-section '.data' data readable writeable
-
-Handle      dq ?
-SystemTable dq ?
-_hello      du 'Hello World',13,10,'(From EFI app written in FASM)',13,10,0
-
-section '.reloc' fixups data discardable
-
-Compile and link it with fasm.exe hello_world.asm.