Bring Intel/HP efi source into project, remove gnu-efi

src/boot/crt0.s

@@ -0,0 +1,85 @@
+;   crt0-efi-x86_64.S - x86_64 EFI startup code.
+;   Copyright (C) 1999 Hewlett-Packard Co.
+;	Contributed by David Mosberger <davidm@hpl.hp.com>.
+;   Copyright (C) 2005 Intel Co.
+;	Contributed by Fenghua Yu <fenghua.yu@intel.com>.
+;
+;    All rights reserved.
+;
+;    Redistribution and use in source and binary forms, with or without
+;    modification, are permitted provided that the following conditions
+;    are met:
+;
+;    * Redistributions of source code must retain the above copyright
+;      notice, this list of conditions and the following disclaimer.
+;    * Redistributions in binary form must reproduce the above
+;      copyright notice, this list of conditions and the following
+;      disclaimer in the documentation and/or other materials
+;      provided with the distribution.
+;    * Neither the name of Hewlett-Packard Co. nor the names of its
+;      contributors may be used to endorse or promote products derived
+;      from this software without specific prior written permission.
+;
+;    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+;    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+;    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+;    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+;    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+;    BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+;    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+;    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+;    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+;    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+;    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+;    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+;    SUCH DAMAGE.
+;
+;	2018-05-05 Converted to NASM syntax by Justin C. Miller
+
+extern ImageBase
+extern _DYNAMIC
+extern _relocate
+extern efi_main
+
+section .text
+align 4
+
+global _start
+_start:
+	sub rsp, 8
+	push rcx
+	push rdx
+
+	; These are already in RDI/RSI from EFI calling us, right? -justin
+	;lea rdi, [ImageBase]
+	;lea rsi, [_DYNAMIC]
+
+	pop rcx
+	pop rdx
+	push rcx
+	push rdx
+	call _relocate
+
+	pop rdi
+	pop rsi
+
+	call efi_main
+	add rsp, 8
+
+.exit:	
+  	ret
+
+; hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
+section .data
+dummy:
+	dd 0
+
+
+%define IMAGE_REL_ABSOLUTE	0
+
+section .reloc
+label1:
+	dd 0							; Page RVA
+ 	dd 10							; Block Size (2*4+2)
+	dw (IMAGE_REL_ABSOLUTE<<12) + 0	; reloc for dummy
+