sys/platform/pc64/amd64/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  * $DragonFly: src/sys/platform/pc64/amd64/locore.s,v 1.1 2007/09/23 04:29:31 yanyh Exp $
  28  */
  29
  30 #include <machine/asmacros.h>
  31 #include <machine/psl.h>
  32 #include <machine/pmap.h>
  33 #include <machine/specialreg.h>
  34
  35 #include "assym.s"
  36
  37 /*
  38  * PTmap is recursive pagemap at top of virtual address space.
  39  * Within PTmap, the page directory can be found (third indirection).
  40  */
  41         .globl  PTmap,PTD
  42         .set    PTmap,(PTDPTDI << PDRSHIFT)
  43         .set    PTD,PTmap + (PTDPTDI * PAGE_SIZE)
  44
  45 /*
  46  * Compiled KERNBASE location
  47  */
  48         .globl  kernbase,loc_PTmap,loc_PDmap,loc_PDPmap,loc_PML4map,loc_PML4pml4e,dmapbase,dmapend
  49         .set    kernbase,KERNBASE
  50         .set    loc_PTmap,addr_PTmap
  51         .set    loc_PDmap,addr_PDmap
  52         .set    loc_PDPmap,addr_PDPmap
  53         .set    loc_PML4map,addr_PML4map
  54         .set    loc_PML4pml4e,addr_PML4pml4e
  55         .set    dmapbase,DMAP_MIN_ADDRESS
  56         .set    dmapend,DMAP_MAX_ADDRESS
  57
  58         .text
  59 /**********************************************************************
  60  *
  61  * This is where the loader trampoline start us, set the ball rolling...
  62  *
  63  * We are called with the stack looking like this:
  64  * 0(%rsp) = 32 bit return address (cannot be used)
  65  * 4(%rsp) = 32 bit modulep
  66  * 8(%rsp) = 32 bit kernend
  67  *
  68  * We are already in long mode, on a 64 bit %cs and running at KERNBASE.
  69  */
  70 NON_GPROF_ENTRY(btext)
  71
  72         /* Tell the bios to warmboot next time */
  73         movw    $0x1234,0x472
  74
  75         /* Don't trust what the loader gives for rflags. */
  76         pushq   $PSL_KERNEL
  77         popfq
  78
  79         /* Find the metadata pointers before we lose them */
  80         movq    %rsp, %rbp
  81         movl    4(%rbp),%edi            /* modulep (arg 1) */
  82         movl    8(%rbp),%esi            /* kernend (arg 2) */
  83
  84         /* Get onto a stack that we can trust - there is no going back now. */
  85         movq    $bootstack,%rsp
  86         xorl    %ebp, %ebp
  87
  88         /* call hammer_time*/           /* set up cpu for unix operation */
  89         movq    %rax,%rsp               /* set up kstack for mi_startup() */
  90         call    mi_startup              /* autoconfiguration, mountroot etc */
  91 0:      hlt
  92         jmp     0b
  93
  94         .bss
  95         ALIGN_DATA                      /* just to be sure */
  96         .space  0x1000                  /* space for bootstack - temporary stack */
  97 bootstack: