usr/src/uts/i86pc/dboot/dboot_xen.s

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/asm_linkage.h>
  30 #include <sys/asm_misc.h>
  31 #include "dboot_xboot.h"
  32
  33 #if defined(__lint)
  34
  35 #else /* __lint */
  36
  37 #if defined(__amd64)
  38
  39         ENTRY_NP(_start)
  40         /*
  41          * At entry we are passed a (start_info_t *) in %rsi.
  42          */
  43         movq    %rsi, xen_info(%rip)
  44
  45         /*
  46          * make sure we have sane processor state
  47          */
  48         xorw    %ax, %ax
  49         movw    %ax, %fs
  50         movw    %ax, %gs
  51         pushq   $0
  52         popfq
  53         pushq   $0
  54
  55         /*
  56          * go off and unpack the kernel bits, adjust page tables, etc.
  57          */
  58         call    startup_kernel
  59
  60         /*
  61          * we can only setup a stack after startup_kernel().
  62          * Its in the lower part of memroy.
  63          */
  64         leaq    stack_space(%rip), %rsp
  65         addq    $STACK_SIZE, %rsp
  66         andl    $0xfffffff0, %esp
  67
  68         pushq   $0x0                    /* push a dead-end frame */
  69         pushq   $0x0
  70         movq    %rsp, %rbp
  71
  72         /*
  73          * when we get back, load the kernel entry point and jump to it
  74          * The address of the xboot_info is the kernel's only argument.
  75          */
  76         movl    entry_addr_low, %esi
  77         movq    $0xffffffff00000000,%rdx
  78         orq     %rdx, %rsi              /* set upper bits of entry addr */
  79
  80         movl    bi, %edi
  81         call    *%rsi
  82         SET_SIZE(_start)
  83
  84 #elif defined(__i386)
  85
  86         ENTRY_NP(_start)
  87         /*
  88          * At entry we are passed a (start_info_t *) in %esi.
  89          */
  90         movl    %esi, xen_info
  91
  92         /*
  93          * make sure we have sane processor state
  94          */
  95         cld
  96         xorw    %ax, %ax
  97         movw    %ax, %fs
  98         movw    %ax, %gs
  99
 100
 101         /*
 102          * go off and unpack the kernel bits, adjust page tables, etc.
 103          */
 104         call    startup_kernel
 105
 106         /*
 107          * we can only setup a stack after startup_kernel().
 108          */
 109         movl    $stack_space, %esp      /* load my stack pointer */
 110         addl    $STACK_SIZE, %esp
 111
 112         pushl   $0x0                    /* push a dead-end frame */
 113         pushl   $0x0
 114         movl    %esp, %ebp
 115
 116         /*
 117          * when we get back, load the kernel entry point and jump to it
 118          * The address of the xboot_info is the kernel's only argument.
 119          */
 120         movl    entry_addr_low, %esi
 121         movl    bi, %eax
 122         pushl   %eax
 123         call    *%esi
 124         SET_SIZE(_start)
 125
 126 #endif  /* __i386 */
 127
 128 #endif /* __lint */