/*-
 * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, 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.
 *
 * $FreeBSD: releng/12.0/sys/amd64/amd64/locore.S 331254 2018-03-20 17:58:51Z emaste $
 */

#include <machine/asmacros.h>
#include <machine/psl.h>
#include <machine/pmap.h>
#include <machine/specialreg.h>

#include "assym.inc"

/*
 * Compiled KERNBASE location
 */
	.globl	kernbase,loc_PTmap,loc_PDmap,loc_PDPmap,loc_PML4map,loc_PML4pml4e,dmapbase,dmapend
	.set	kernbase,KERNBASE
	.set	loc_PTmap,addr_PTmap
	.set	loc_PDmap,addr_PDmap
	.set	loc_PDPmap,addr_PDPmap
	.set	loc_PML4map,addr_PML4map
	.set	loc_PML4pml4e,addr_PML4pml4e
	.set	dmapbase,DMAP_MIN_ADDRESS
	.set	dmapend,DMAP_MAX_ADDRESS

	.text
/**********************************************************************
 *
 * This is where the loader trampoline start us, set the ball rolling...
 *
 * We are called with the stack looking like this:
 * 0(%rsp) = 32 bit return address (cannot be used)
 * 4(%rsp) = 32 bit modulep
 * 8(%rsp) = 32 bit kernend
 *
 * We are already in long mode, on a 64 bit %cs and running at KERNBASE.
 */
NON_GPROF_ENTRY(btext)

	/* Tell the bios to warmboot next time */
	movw	$0x1234,0x472

	/* Don't trust what the loader gives for rflags. */
	pushq	$PSL_KERNEL
	popfq

	/* Find the metadata pointers before we lose them */
	movq	%rsp, %rbp
	movl	4(%rbp),%edi		/* modulep (arg 1) */
	movl	8(%rbp),%esi		/* kernend (arg 2) */

	/* Get onto a stack that we can trust - there is no going back now. */
	movq	$bootstack,%rsp
	xorl	%ebp, %ebp

	call	hammer_time		/* set up cpu for unix operation */
	movq	%rax,%rsp		/* set up kstack for mi_startup() */
	call	mi_startup		/* autoconfiguration, mountroot etc */
0:	hlt
	jmp	0b

	.bss
	ALIGN_DATA			/* just to be sure */
	.globl	bootstack
	.space	0x1000			/* space for bootstack - temporary stack */
bootstack:
