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      1 /*	$NetBSD: start.S,v 1.2 2017/04/29 00:05:35 nonaka Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1999 Hewlett-Packard Co.
      5  *     Contributed by David Mosberger <davidm (at) hpl.hp.com>.
      6  * Copyright (C) 2005 Intel Co.
      7  *     Contributed by Fenghua Yu <fenghua.yu (at) intel.com>.
      8  * All rights reserved.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of Hewlett-Packard Co. nor the names of its
     19  *    contributors may be used to endorse or promote products derived
     20  *    from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     25  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
     26  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     28  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     31  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     32  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * crt0-efi-x86_64.S - x86_64 EFI startup code.
     38  * $FreeBSD: head/sys/boot/efi/loader/arch/amd64/start.S 282727 2015-05-10 13:24:26Z ian $
     39  */
     40 
     41 #include <machine/asm.h>
     42 #include <sys/bootblock.h>
     43 
     44 	.text
     45 	.align 16
     46 	.globl _start
     47 _start:
     48 	subq	$8, %rsp
     49 	pushq	%rcx
     50 	pushq	%rdx
     51 
     52 0:
     53 	lea	ImageBase(%rip), %rdi
     54 	lea	_DYNAMIC(%rip), %rsi
     55 
     56 	popq	%rcx
     57 	popq	%rdx
     58 	pushq	%rcx
     59 	pushq	%rdx
     60 	call	_C_LABEL(self_reloc)
     61 
     62 	popq	%rdi
     63 	popq	%rsi
     64 
     65 	call	_C_LABEL(efi_main)
     66 	addq	$8, %rsp
     67 
     68 .Lexit:
     69 	ret
     70 
     71 	/*
     72 	 * hand-craft a dummy .reloc section so EFI knows it's a relocatable
     73 	 * executable:
     74 	 */
     75 
     76 	.data
     77 	.section .reloc, "a"
     78 	.long   0
     79 	.long   10
     80 	.word   0
     81 
     82 	/* boot parameters */
     83 	.text
     84 	.code16
     85 	.align 512
     86 .Lfake_bootxx:
     87 	jmp	1f
     88 	.balign 4
     89 	.long	X86_BOOT_MAGIC_EFI	/* checked by installboot */
     90 	.globl _C_LABEL(boot_params)
     91 _C_LABEL(boot_params):			/* space for patchable variables */
     92 	.long	1f - boot_params	/* length of this data area */
     93 #include <boot_params.S>
     94 	. = .Lfake_bootxx + 0x80	/* Space for patching unknown params */
     95 1:
     96