sys/platform/pc64/x86_64/locore.s

   1 /*-
   2  * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/amd64/amd64/locore.S,v 1.175 2003/05/31 06:54:28 peter Exp $
  27  */
  28
  29 #include <machine/asmacros.h>
  30 #include <machine/psl.h>
  31 #include <machine/pmap.h>
  32 #include <machine/specialreg.h>
  33
  34 #include "assym.s"
  35
  36 /*
  37  * Compiled KERNBASE location
  38  */
  39         .globl  kernbase,loc_PTmap,loc_PDmap,loc_PDPmap,loc_PML4map,loc_PML4pml4e,dmapbase,dmapend
  40         .set    kernbase,KERNBASE
  41         .set    loc_PTmap,addr_PTmap
  42         .set    loc_PDmap,addr_PDmap
  43         .set    loc_PDPmap,addr_PDPmap
  44         .set    loc_PML4map,addr_PML4map
  45         .set    loc_PML4pml4e,addr_PML4pml4e
  46         .set    dmapbase,DMAP_MIN_ADDRESS
  47         .set    dmapend,DMAP_MAX_ADDRESS
  48
  49         .text
  50 /**********************************************************************
  51  *
  52  * This is where the loader trampoline start us, set the ball rolling...
  53  *
  54  * We are called with the stack looking like this:
  55  * 0(%rsp) = 32 bit return address (cannot be used)
  56  * 4(%rsp) = 32 bit modulep
  57  * 8(%rsp) = 32 bit kernend
  58  *
  59  * We are already in long mode, on a 64 bit %cs and running at KERNBASE.
  60  */
  61 NON_GPROF_ENTRY(btext)
  62
  63         /* Tell the bios to warmboot next time */
  64         movw    $0x1234,0x472
  65
  66         /* Don't trust what the loader gives for rflags. */
  67         pushq   $PSL_KERNEL
  68         popfq
  69
  70         /* Find the metadata pointers before we lose them */
  71         movq    %rsp, %rbp
  72         movl    4(%rbp),%edi            /* modulep (arg 1) */
  73         movl    8(%rbp),%esi            /* kernend (arg 2) */
  74
  75         /* Get onto a stack that we can trust - there is no going back now. */
  76         movq    $bootstack,%rsp
  77         xorl    %ebp, %ebp
  78
  79         call    hammer_time             /* set up cpu for unix operation */
  80         movq    %rax,%rsp               /* set up kstack for mi_startup() */
  81         call    mi_startup              /* autoconfiguration, mountroot etc */
  82 0:      hlt
  83         jmp     0b
  84
  85         .bss
  86         ALIGN_DATA                      /* just to be sure */
  87         .space  16384                   /* space for bootstack - temporary */
  88 bootstack: